IR Technologies DL252-850-15 (AC220V) - infrared spotlight is designed for all-weather operation as part of a video surveillance system for invisible illumination of objects in conditions where natural light is not enough for normal operation of the video camera. The spotlight can work together with a black-and-white or color video camera with a day-night mode. “Day/Night” color video cameras with so-called “electronic” switching to night mode are categorically unsuitable for working together with IR illumination, because in them the IR filter does not shift anywhere and sensitivity in the IR range does not appear. There are no filters with supposed sensitivity in the operating range of IR illumination and at the same time with “correct” color rendition due to the absolute contradiction with the principles of organizing the color channel corresponding to the sensitivity (visibility) curve of the human eye. The optical lenses of the video camera lens must be made of low-dispersion glass (as a rule, the lens designation must contain the index “IR”) to prevent image defocusing when using IR illumination. The declared detection range is ensured when using a black-and-white video camera with a CCD-matrix sensitivity of at least 1.5 * 10-5 W/m2 in the IR range of 800 - 1000 nm (which is conventionally equivalent to a sensitivity of 0.01 Lux without IR correction), at a level output video signal of at least 15 IRE, with lens aperture F=1.2. With worse sensitivity parameters of the video camera and lens aperture, the illumination distance must be recalculated downward. The spotlight contains a radiating matrix based on powerful LEDs with combined forming optics. The spotlight is made of aluminum alloy. Rear end The housing has a developed surface in the form of cooling fins. Located on the front side of the case LED matrix covered with an infrared filter made of special plastic. The DL252-850-15 (AC220V) floodlight is equipped with an adjustable mount for adjustment and fixation at the site of operation. Extended ranges of low-voltage input supply voltage (depending on the version) - DC - from 10.5 to 30V or AC - from 10 to 24V - allow you to use any convenient standard power sources, as well as connect the spotlight to centralized low-voltage sources uninterruptible power supply. The spotlight is equipped with a built-in stabilizer made using pulse-down converter technology. The use of this product as part of a spotlight allows you to stabilize the current consumed by the LED matrix in a safe area of operation, allows you to maintain the declared characteristics of the spotlight throughout its entire service life and protects it from short-term pulses (lasting up to 5 ms with a duty cycle of at least 20) of voltage up to 50V at the input. The operation of the spotlight is automated using a photosensor located in the lower part of the body and sensitive to the visible region of daylight. Under office (fluorescent) lighting conditions, the sensitivity of the photosensor does not change. The DL252-850-15 (AC220V) floodlight has a remote testing function. It consists of self-locking the photosensor for 40-50s. and forced switching on of the spotlight for the same time, regardless of external lighting conditions, in the event of a short-term power failure (at least 1 minute). This self-locking of the photo sensor allows, when turning off and on the corresponding circuit breaker located in the general lighting panel, to easily check from the ground during the daytime the performance of the spotlight installed in a hard-to-reach place - for example, using a video camera mobile phone. The spotlight is equipped with a special diaphragm valve to equalize the internal pressure with atmospheric pressure environment when heated during operation. At the same time, the sealing of the spotlight is not compromised and the degree of protection against moisture penetration from the environment (IP66) is maintained. Attention! The explosion-proof version of the floodlight does not have a pressure equalization valve! The floodlight can be supplied in a wide range of designs through the use of standard additional options, including their combinations: In order to ensure a higher starting level of mutual understanding between our technical support and customer specialists when discussing the configuration of a specific projector, please fill out special form- Order and configuration sheet and send it to our address at e-mail or by fax. Along with the basic control elements: light sensor (twilight sensor) and current stabilizer, the comprehensive use of additional options allows us to talk about the most high degree automation of the operation of our spotlights among analogues of domestic and foreign production. Compliance with safety and electromagnetic compatibility standards. The products comply with GOST R 50009-2000 “Electromagnetic compatibility of technical equipment. Technical means burglar alarm. Requirements and test methods.", GOST R IEC 60065-2002 "Audio, video and similar electronics. Safety requirements.”, EN60065:2001+Amd1 “Audio, video and similar electronic apparatus: Safety requirements and maximum permissible exposure limits according to IEC60825-1”, as well as the Electromagnetic Compatibility Directive 89/336/EEC as amended by 92/31 /EEC and 93/68/EEC. Lifetime. Typical service life is 8 years with a utilization factor of 0.5 (12-hour mode) and a drop in the spotlight's radiation power to 70% of the original level. WARRANTY SERVICE TERMS: The PC IR Technologies company establishes a warranty period of 3 years for all products sold under the Dominant™ brand from the date of purchase of the product from the PC IR Technologies company or its official seller. Body color – black. Optionally - any from the RAL catalog. The power cable is 1.2 m long (PVS wire 2x0.75). When ordering a spotlight with AC220V power supply, the power supply is included in the kit and is already connected on the low side to the spotlight. The cable coming out of the power supply is 30 cm long (when connecting to the network, you must use an additional junction box). The price of the power supply is included in the total cost of the spotlight with AC220 power supply.Description IR Technologies DL252-850-15 (AC220V)
Design and operating principle:
Technical characteristics of IR Technologies DL252-850-15 (AC220V)
Two-way acoustic system 10AC-225, later produced under the name 15AC-220, was included in the set of the transistor radio "Cantata-205-stereo", also produced under the name 6AC-224
Production: Murom plant RIP. Class of 1986
Outwardly it resembles the 15AC-213, but differs from them in larger dimensions and weight, a different filter circuit with the same set of heads.
Upon closer examination, they differ in the location of the bass reflex port of this model; it is at the bottom, while in the 15AC-213 it is at the top next to the HF, and the 15AC-213 filter also contains an LED overload indicator.
The external design is mahogany veneer coated with furniture varnish.
Set of heads: 25GDN-3(15GD-14); 6GDV-2(4GD-56).
Acoustic design: bass reflex.
Specifications:
1. Reproducible frequency range 63-16000 Hz;
2. Characteristic sensitivity level 84 dB;
3. Rated power 15 W;
4. Nominal resistance 4 ohms.
5. dimensions 370x225x210 mm.
6. Weight 6 kg
Frequency response graph
A second-order low-pass filter, a choke and three capacitors connected in parallel, each 1 µF MBM type at 160 V.
First-order high-pass filter, 1 µF capacitor (MBM).
Filter diagram from the instructions for Radiola Kontata 205
In the directory of Alekseev Yu.P. The filter circuit differs from that shown in the Passport:
To disassemble the speaker, you need to unscrew the eight screws securing the decorative front panel to the case, remove the front panel, unscrew the 4 screws securing the dynamic heads to the case, remove the dynamic heads by unsoldering the mounting wires.
From the book “USSR: Diary of a Kid from the Outskirts” by Vladimir Kozlov. (In the photo, Sound Recording Point No. 5. Yerevan, 1988) Me, Natasha and dad left the “Cult Goods” next to “Rodina”. I was carrying a cardboard box with a Belarus-301 tape recorder. At Rodina there was a poster for the film Disco Dancer. It was already the third week. Dad asked: “Well, are you satisfied?” Natasha nodded. I asked: “What are you going to write down?” – First – Adriano Celentano and the group “Ricky e Believe”. Lenka has records... - Where can you get cassettes? - I'll buy it. – Cassettes are in short supply. - Not that big. Do you remember, in winter, even in “glass” they sold... “Tedeka” for eight rubles... - That was in winter... - So what? Maybe they will be somewhere else. As a last resort, I’ll ask my dad to bring me back from his business trip. *** – How is the tape recorder still working? – Uncle Zhora asked. “Well, yes,” I answered. - Should it break? – I don’t trust domestic technology. And even more so made in our city. Good tape recorders are only Japanese. Ours is one name. “You tell mom and dad this,” Natasha smiled. - It’s good that at least you bought one. - And what have you already written down for yourself? - Well, it’s still not enough. Toto Cutugno, Celentano, “Ricky e believe”... - Solid Italians, or what? - Well, yes, but what’s wrong? - There is so much good music... The Beatles, Deep Purple, Led Zeppelin, and she listens to the Italians... - Everyone listens to them now... - And you listen because everyone? Or do you like it? – I like it, in general. *** A trolleybus approached. Lesha and I went in and stood on the back platform. “In general, reel-to-reel tape recorders are in no way comparable to cassette tape recorders,” said Lesha. – Cassette players are the best - second class, but reel-to-reel players, on the contrary, are the worst - second class. But mostly the first and highest... - And what class is ours? - Third, what else? This is clear from the model. If “Belarus-301” means third class, and if, for example, “Olympus-003” then it is the highest. I tell Natasha - let your parents buy you a reel-to-reel player, and give the cassette player to your little one... - They won’t buy it. I heard them say that they have no money now. - This is bad. Otherwise, she would have a cool device, and you have your own - for the first time, and then you will also switch to coils. – Which one do you have at home? – “Rostov-102”, plus a “Corvette” amplifier and “AS-50” speakers. Enough good quality. A higher class would be better, but so far it’s not bad either, but we’ll see. *** We approached a wooden recording booth - on the corner of Leninskaya and Pozharny lane. Lists of albums to be recorded were pinned to the walls of the booth with pins - all by hand: “Time Machine - 82, 83–I, II, 84, 85”, “Dynamic – 83, 84, 85”. Lesha took out a Sony cassette from Natasha's pocket. Dad brought her three of these from Leningrad. The red-haired, curly-haired guy in the booth took a pen and a piece of paper and looked at us. -What are we going to write?
I think there is no doubt that best sound can only be obtained from full-size floorstanding three-way speakers. But there are often cases when there is simply no room for them. Small speakers, as a rule, will already be two-way. The requirements for them will be a little less, but the sound should still be good. This is the option we will discuss.
Acoustics 10MAS-1 from Estonia-006-stereo
Main distinctive features there were relatively modest sizes with increased bass output, and also only two speakers (to save size).
Further - more, the size of the speakers became smaller, the sound - worse. Users were happy that they could be put into a niche in a furniture wall, placed on a cabinet under the ceiling or on the floor. This completely killed the sound, but few people cared, and the rattling of dishes in the cabinet with the speaker aroused delight and pride.
What are the shortcomings of a family of such models, of which dozens were produced? In my opinion, the root of all evil is dual-band and incorrect frequency division. I believe that speakers such as 10GD-30, 25GD-26, 6GD-6, 10GD-34, 15GD-14 and the like are fundamentally unable to sound well down to 5 kHz, which is the usual crossover frequency in two-way speakers with these speakers . By the way, about the partners of these speakers - 3GD-31, 10GD-35 and the like, kind words you won’t hear, without design modifications and complex filters, they don’t work the best.
It must be said that there were decent two-way speakers that could sound good up to 5 kHz, but they did not require small-sized enclosures, so they were not used.
Progress moved further along the road to absurdity, The speakers became smaller and smaller, and so did the speakers for them. Systems 15AC and 25AC were produced in large quantities, and there are still many of them on the secondary market at reasonable prices. It would be tempting to improve them with minimal rework and expense.
Acoustic systems 15AC-109
I think these columns are worthy of improvement. If their body is not damaged, then it looks good, the volume is satisfactorily sufficient for a standard speaker, there is FI.
Photo source: vega-brz.ru
The 15AS-109 is equipped with 15GD-14 (25GDN-3-4) and 10GDV-2-16. The section is at a frequency of 5 kHz and cannot be changed because operation of the 10GDV-2-16 below is impossible. Therefore, the sound is sluggish, gray, dull due to the indistinct reproduction of mid-frequencies (the most important for the overall perception of sound) frequencies. And this applies not only to this model, but also to all two-way speakers in which the previously mentioned woofers are installed.
The best Soviet designers knew this very well and, to modernize such two-way radios, they suggested that radio amateurs install full-fledged midrange speakers, such as 2GD-40. Alas, the insanity of miniaturization did not allow anything additional to be placed in tiny cases, especially in a box, because the volume was already insufficient.
External birdhouse towns were proposed, which sounded good, but achieving a cultural appearance was difficult. In addition, no matter what they say, the 2GD-40 and the like worked according to the data sheet up to 12.5 kHz, above that there is a break, and the directivity above is needle-shaped, i.e. you need a three-strip in a new housing and with new filters, from the old speakers there was only one woofer left.
The option is good and I made such a three-strip, basically only on available Soviet speakers, but that’s not what we’re talking about today.
Modification of speakers 25GDN-3-4
The 15AS-109 has 25GDN-3-4 speakers installed, these are good speakers, brothers of the 10GD-34, but much better than them due to the huge powerful magnet. As a result, they can operate normally at a volume of 8...12 liters, provide output from 30...40 Hz with a decay of not 15 dB, like the S-90 and the like, but 3...6 dB. Of course, the volume of moving air and power are not comparable to the 75GDN.A common problem with most Soviet speakers with a rubber surround is its hardening, which causes an increase in the resonant frequency and quality factor, and this leads to a deterioration in quality. If initially (during manufacture) the suspensions were normal, you can try to revive them. If tight hangers have already been installed at the factory, only replacing them will help.
What can I advise from practice? Take cotton wool, good gasoline (“Galosh” or similar), cut a circle out of cardboard the size of the paper part of the diffuser and attach it so that less liquid gets on the paper. Next, moisten the cotton wool and generously moisten the rubber suspension from the front part.
Yes, gasoline evaporates quickly, but dry rubber greedily absorbs gasoline, changes before your eyes, and turns from dull to shiny. Of course, all work, especially with flammable liquids, requires appropriate safety measures.
So, we feed Razina from the front until she refuses to drink gasoline. Then we place the speaker with the magnet facing up and pour gasoline into the groove of the corrugation, wait until it is absorbed and evaporates. Immediately after complete evaporation, it is useful to do a dynamic warm-up for an hour or two low frequencies at the resonant frequency (easily determined by eye) achieving maximum amplitude, but without knocking the sleeve on the magnetic system.
If the tires were really dry, they will change and the speaker parameters will noticeably improve. Of course, it is best to take measurements if possible. In my practice, there were both cases of a decrease in resonance by 20 Hz, and a minor effect of just a few Hertz.
The problem is that after a couple of days a partial rollback of the improved parameters occurs. To consolidate your achievements, you need to use a car drive belt restorer. It is sold in aerosol cans. I think they are all about the same, I bought "Belt Dressing & Conditioner" from Permatex.
We cover the corrugation with foam on both sides alternately 2-3 times (this is where you will need a cardboard circle, without it there will be spots and unsightly streaks on the diffuser) waiting for it to dry each time.
The effect of this treatment is long-lasting, clearly present for more than six months (in my experience). The rubber becomes completely different to the touch - soft and slightly sticky, and shiny to the eye. Warming up with maximum amplitude is also advisable.
The resonance decreased from 60...65 to 45...50 Hz, i.e. it became like the new speakers.
Replacing speakers 10GDV2-16
The 10GDV2-16 speaker fundamentally cannot operate from 2...3 kHz, so it can only be replaced. The main requirement is a low resonant frequency of 1...2 kHz without overshoot at resonance. I think 2GD-36 and 4GD-56 will do, but they are inconvenient to install, so I didn’t use them. I installed Philips AD0142 with a resonance of 1300 Hz, the result was not bad.
This intermediate option and before setting up FI. I understand that few people have these Philips, and I didn’t want to put them here because there are good complete Philips subwoofers for them.
Chinese tweeters Alphard TW-302
For this budget project, I didn’t want to use tweeters whose cost per unit was higher than a pair of speakers, and the size also played an important role. That's why I bought these cheap (but not the cheapest) tweeters.
It was interesting to listen to these “silk” domes. The “silk” here is clearly synthetic, the reinforcement threads are sparse, but the material is very soft and elastic, sharply different from plastic membranes.
The case is plastic, but it’s bad - it gets scratched, there’s no rigidity.
The declared parameters of 8 Ohms and 95 dB turned out to be “Chinese” - the resistance is 4 Ohms (impedance over the entire frequency band, not just measured by a tester), and the sensitivity... I can’t measure it accurately, and it’s not necessary, according to my estimates, 88 dB. Is there a difference with 95 dB?..
However, the resonance is 900 Hz and 1200 Hz, the sound is not bad, the membranes can be easily replaced. In general, “third grade is not a waste.”
Modification of hull 15AS-109
I will not go into detail, since it has been described many times, but I will focus on the most important. This is a thorough sealing, filling all joints and cracks from the outside and inside. It is advisable to check using the LIMP program - the cracks are very clearly visible.
It is advisable to remove epoxy drips on the front panel with a chisel and smooth out any unevenness.
Install a spacer inside tightly between the front and rear panels. I placed a block with a cross section of 20x40 mm. Place the spacer between the holes for the speakers.
For the Alphard TW-302 tweeters I had to make additional panel with a hole for the magnetic system, it is inside. Screws are screwed into this panel through the holes in the tweeter, and it attracts the head to the front panel.
Faux suede pads are cut out for the speakers. I recommend replacing the screws with more modern ones.
Fill the holes for the speaker wires with glue, install spring clamps on the back; unfortunately, normal terminals with screw clamps could not be installed due to lack of space.
If desired, the outside of the body can be varnished or otherwise refined. Inside the housing, be sure to fill it tightly with fluffy padding polyester, but leave a passage between the hole of the FI pipe and the woofer.
Instead of a nasty standard plastic panel, I made a frame from a thin laminate and stretched canvas-type fabric over it. Attaching the frame to the body via Velcro is simple and does not require drilling holes. Due to my inexperience, I installed too long pieces of Velcro and removing the frame turned out to be oh so difficult!
Correct AC filters
We often see how home-made people think that filters are something of a tertiary importance; by audiophile standards, it is enough to install one capacitor and one coil at most.In my deep conviction, everything is quite the opposite - filters are the most important element of speakers, the wrong filters can ruin the sound of any speakers. First-order filters can work with well-matched pairs of speakers that have a natural roll-off at crossover frequencies without humps or spikes. In the vast majority of cases, it is difficult for us to find such pairs.
And I am also convinced that it is impossible to quickly and correctly debug filters without acoustic measurements.
The benefits of any calculators are amazing, since they use resistors as models, although speakers are complex electromechanical systems with resonances and other features.
The exception is LSP CAD and only if you feed it the results of microphone measurements.
It was possible to achieve a very simple filter circuit, with a minimum of standard ratings (there was special emphasis on this).
Capacitors K73-16, all parts are placed on the plywood of the old filter for convenience. The installation was done using an acoustic cable with a cross-section of 1.5 square.
This is what happened in LSP CAD
And here is the result of measurements with a microphone. Compare.
Here's the impedance graph, it doesn't drop below 4 ohms anywhere, so the speakers will work fine with any 4 ohm amplifier.
And here’s what LIMP showed in the box, where there seemed to be no obvious cracks...
Below 300 Hz in a normal room, due to reflections, measurements are difficult to make, so they are taken point-blank.
Point-blank measurement of the modified 25GDN-3-4 speaker, the FI port is plugged. It can be seen that at a level of -3 dB the lower frequency is 45 Hz. Find the frequency of -15 dB, as is usually measured for industrial speakers, using the graph yourself. After turning on and adjusting the FI, we managed to lower the frequency, but it is difficult to plot the measurements due to the distance of the FI hole from the speaker.
I repeat, despite the low reproduced frequency, you should not expect the same bass as from the S-90 due to the tiny size of the diffuser, but this is enough for tonal balance. From my point of view, tonal balance is extremely important.
Listening to the updated 15AC-109
The speakers were made back in the summer. Of course, they do not pretend to be “hiendas”. We compared it with my homemade three-way three-body version on the 25GDN-3-4 with fashionable sequential filters, and with the Tandberg 2510 (does anyone remember this company today - Hi-End of the 70s?).Naturally, they are inferior to both. Nevertheless, after the modification the speakers clearly became better. I am sure that they are better than any factory 15AC, S-20, S-30, all sorts of cubes, etc. The sound is clear, clean, compared to the three-way version there is a slight coloration, which is not surprising since the tweeter operates from about 2 .5 kHz, and below is a subwoofer.
A prerequisite is to work on a stand, at least on a stool. If the bass is recorded on the disc, it is also in the speaker; if there is no bass in the recording, then the speakers do not reproduce it. For normal volume levels in the room, up to 4 W per channel is sufficient. “Sibilants do not irritate.”
In general, the speakers play quite brightly, but not intrusively. The tonal balance is shifted slightly upward compared to the above speakers.
Their small size allows them to be placed even on a computer desk. The speakers are quite heavy, which is rather an advantage.
Total
To my surprise, the result was better than expected. Now all that remains is to hand the speakers over to the good hands of one of my friends for a new permanent residence permit.Thank you for your attention!
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The two-way acoustic bass reflex system was equipped with semiconductor stereo cassette recorders "Kometa-225S", "Kometa-225S-1", "Kometa M-225S-2", "Kometa M-225S-3" ("Nota-225").
Production respectively from 1987, 1988, 1989 and 1990.
Specifications:
Rated power – 15 W
Nameplate (Limit long-term) power – 25 W
Reproducible frequency range – 63 – 16,000 Hz
Average sound pressure level at an electrical power of 10 W in the frequency range 100-4000 Hz, not less than – 94 dB
Nominal electrical resistance – 4 Ohms
Dimensions – 328x190x190 mm
Weight 5.8 kg
Set of speakers: LF – 25GDN-3-4, HF – 5GDV-1
Type of acoustic design – bass reflex
Body material – plywood or chipboard.
Vega 25 AS-101 was a widely used Soviet acoustic in its time... today we will look at it, disassemble it down to the cogs and figure out who is who and what to do with it now?
In general, these acoustics have been produced since 1980 at the Berdsk Production Association "Vega", then they were called 15 AS-109. In 1989, a new GOST 23262-88 was issued, and this AS was renamed 25 AS-101, without changing anything structurally.
This is the so-called “shelf” household acoustic system, which was equipped with various players, tape recorders and stereo systems. Quite compact and weighty silver-colored speakers. The absence of legs suggests that they are supposed to be hung on the wall; there are two canopies there for this purpose. There, on the back wall there is a label with the name, GOST, passport number, indicating the nominal resistance, indicating the maximum long-term power, year of manufacture (not filled in) and price - 75 rubles.
Vega 25 AS-101 (like 15 AS-109) consists of:
1) sealed non-separable housing;
2) dynamic head LF - midbass type:
3) HF dynamic head;
4) filter;
5) bass reflex;
6) front panel;
7) connecting wire.
Reproducible frequency range - 50-20000 Hz
Frequency response unevenness, at lower frequency - 8 dB
Sensitivity level - 84 dB (Pa/W)
Uneven frequency response of sound pressure - ±4 dB, in the range 100..8000 Hz
Harmonic distortion of speakers, in the frequency range - 250-1000 Hz - 2%, 1000-2000 Hz - 1.5%, 2000...6300 Hz - 1%
Nominal electrical resistance - 4 ohms
The minimum value of total electrical resistance is 3.2 Ohms
Type of low-frequency design - bass reflex
Bass reflex tuning frequency – 45 Hz
Filter cutoff frequency – 5000 Hz
Speaker internal volume – 8.5 l
Dimensions - 360x220x190 mm
Weight - 6.8 kg
Frequency response characteristics
Speakers without front panel
So, here are my measurements:
The body is assembled from sheets of 9-layer plywood 12 mm thick. Speaker height - 360 mm, width - 220 mm, depth 165 mm (190 with front decorative grille). The body is not dismountable - it is tightly glued. There are no spacers or stiffeners, or other elements for the strength and rigidity of the body.
There are three holes on the front panel:
rectangular for bass reflex 35x80 mm;
round hole with a diameter of 90 mm for a high-frequency speaker;
another round one for the bass/midrange speaker with a diameter of 115 mm.
The front and back walls are slightly recessed inward by 1.5-2 mm. The seats for the speakers and FI are recessed - milled to a depth of ~5 mm.
The front panel is plastic, of different thicknesses (but not less than 2 mm), has three holes for speakers (covered with a metal mesh) and one for a bass reflex with a decorative “divider”. It is attached to the speaker body using six screws, the heads of which are covered with decorative caps. There are foam pads at the points of contact with the speakers and FI.
Dynamic head 25GDN-3-4
The following dynamic drivers are used in the Vega 25 AS-101 speaker: low-frequency 25GDN-3-4 at 4 Ohms (range 50-5000 Hz); high frequency 16 ohm 10GDV-2-16(range 5000-25000 Hz). Both speakers have unshielded magnets.
Dynamic head 10GDV-2-16
Bass reflex used in 15 AC-109 and 25 AC-101, dimensions
In the bottom photo, at the end of the FI there is a cutout - this is the previous stupid owner who was using a drill,
drilled the back wall of the speakers to hang them on the wall, and at the same time made a hole in the FI
Bass reflex "L" shaped, plastic, glued from two halves. Dimensions: length 148 mm, hole size 19x68 mm - the same at the beginning and at the end. The thickness of the plastic is 4-5 mm (different in different places).
Each speaker and FI are attached to the body with four screws each. The speakers have a 2 mm thick rubber gasket. The bass reflex has a thin foam pad.
The separating filter is made specifically, on a rectangular piece of the same 12 mm plywood. Two coils are wound with thick copper wire, the capacitors used are old and high-quality ones (if the aesthetic component turns them off, let them buy some pretty one from China).
Capacitors used were MBGO-2 2 µF, 1 µF, 4 µF. And also two large ceramic resistors 1PEV - the diagram for the filter can be viewed in the Operating Manual.
Standard filter (crossover) in Vega 25 AS-101 acoustics
Panel AC Vega 15 AC-109
As already mentioned, the Vega 15 AS-109 acoustic system was practically no different from the 25 AS-101, only the inscription, label and also the joints of the corners of the case. The filter shown in the photo above was in one Vega 15 AC-109 column - but this, most likely, is the fruit of someone’s initiative...
To this day, speaker systems 15 AS-109 and 25 AS-101, if preserved in good condition, are very attractive. In terms of quality, they correspond to quite expensive (relatively expensive) foreign household systems, thanks to the good 25GDN-3-4 head, good body and a normally calculated filter and bass reflex.
Even a small modernization of these speakers will allow you to get decent sound at minimal cost - buying an equivalent Chinese product will cost many times more and it is not a fact that this equivalent value will be of real quality. A lot has been written on the Internet about options for upgrading/refining Vega acoustics... For the most part, it all comes down to damping from the inside of the speaker body with materials such as padding polyester, batting or felt. Adding cotton wool to deceptively increase the displacement of the hull. Sealing joints and installing spacers and stiffeners. Replacing the wires inside the speakers with thicker ones, I am silent about “oxygen-free copper cables” - the effectiveness of which is very doubtful. Can also be placed on the back wall terminal connector, even if it is Chinese, is cheap . Replacing the filter is impractical - the correct calculation is not within the capabilities of everyone. Also, you should not replace old Soviet capacitors in the filter with new ones: high-quality capacitors are oh so expensive, and Soviet ones are no worse than them. In addition, capacitors of the MBGO type are hermetically sealed and there is simply no effect of “drying out” of the electrolytes.
Separation filter 15 AS-109, home-made, instead of the factory one (no quality)
Speakers tend to deteriorate over time - this applies to surrounds that are made of rubber (rubber hardens with time, temperature and exposure to sunlight), they are also made from any foam-like material, which crumbles due to time... diffusers fade from light, the supply wires are frayed... Rubber hangers are usually rubbed with castor oil in several passes and they partially restore their characteristics. A rotten foam suspension just needs to be replaced with a new one - they are commercially available. Those 25 AS-101 speakers that I am now considering are more than 20 years old, and they were far from being treated gently... but the dynamic heads are in excellent condition and the rubber surround has not lost any of its characteristics - they were not standing in a sunny place, not was tested by the heat.
The supply wires can also be changed without problems, by either shortening them or replacing them with a wire simply insulated and twisted into a loose spiral.
Faded diffusers can be painted with regular ink or coated with acrylic varnish.
Replacing the factory plastic face with all sorts of fabric panels is a matter of taste; I personally like the factory design.
The joints of the AC Vega case from the inside are well glued, but there are no spacers or stiffeners
The protruding bolts are for mounting the filter
The connecting wire is just a hole with a missing wire, with a drop of glue...
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