S90 acoustic speakers. S90 columns: specifications, scheme

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Modernization of S-90 columns by replacing standard enclosures on the labyrinth design of Dinimikov NC

Upgrade of the labyrinth design of S-90 Cars of carbon and sticker on the inner surface of a woolen blanket
At first, only the front knee of the labyrinth was placed, then the side surfaces too
Ready Labyrinth S-90 with Closed Wool Inside Surfaces

Alteration of the most famous columns of the USSR radio engineering S-90

Alexander Rogozhin invented know-how, how to translate the most famous for most Russian-speaking people speakers of the S-90 radio engineering to the labyrinth cases. The article is devoted to the most massive and more than 20 years considered the reference to the acoustics of the Soviet period, which in the first of its generation was called 35as-1. And Rogozhin offers to make from 35as-1 (radio engineering S-90) columns with the name "cheap, loud and super-bassist"!

Oda speakers radio engineering S-90 (35as-1)

There is no such person who speaks Russian, Ukrainian, Belarusian, who at least once in his life heard famous soviet speakers The radio engineering S-90, or did not have on the mezzanine, in the closet, at home or on the phasenda one of their modifications produced in more than 30 years. You can think anything about their sound, kind, rubber speakers, but in fact it is the most common "folk" columns on the expanses of the former USSR. They and now dozens of thousands work in the systems of music lovers who are sorry to throw them. Compared to the branded "Novodel" they play quite and very worthy.

If there is a choice in front of a person, in which speakers listen to music: with bass, loud, and for funny money, then despite all the minutes from the radio engineering S-90, they have practically no competitors, and before they were not the more. In late USSR, in addition to the S-90 speakers, of course appeared "clones", constructed from the best foreign samples, for example - electronics 100As063 or 75as-063. But they were very expensive and are not much common, they could not care with the S-90 acoustics. To obtain three full-fledged stripes from any other columns with such as the S-90 power, a 10 inches low-frequency speaker and almost a gift was impossible in principle. Now it is even more relevant.

Tens of thousands of these columns are now working in the rooms of young and not very people who are not able to carry out complex projects on expensive import dynamic heads. For quite understandable reasons, many of our compatriots are in no hurry to give up acoustics of radio engineering S-90. They do not burn with the desire to run to the store and buy beautiful branded speakers, which for the most part different from S-90 only appearance, which cannot be said about their sound.

Nevertheless, we all love to listen to music, everyone has a good mood when you want to include "on the full coil." Everyone loves a high-quality bass, without which almost any music is deprived of the foundation and most of the emotions. Many styles of music without bass are generally impossible to listen, because With it, the lion's part of important musical information disappears. The soul asks Wuhuh! And the low frequencies are actually a very thin, to adequately sound and make the impression they are asking for large speakers, housings and capacities. But even if there is all this (in large columns such as S-90), the bass is often obtained by buzzing, tightened and vague, and does not give us the "kayfa", which in the idea should give. From such a bass, we quickly get tired and begin to twist the tone control knobs or switch the equalizer modes on the receiver. And instead of receiving pleasure - to annoy and think about the imperfection of this mortar ... In such a situation, almost all lovers of music and the owners of this acoustics, in particular, turned out.

Low frequency problems S-90

The reason that over the past 30s, the owners of the acoustics of the S-90 radio engineering and its numerous modifications are not satisfied with its sound and somehow try to cope with this problem in several reasons. The main problem of S-90 speakers, confirmed by repeated studies of specialists - an error made in the design of a low-frequency design of the dynamics of 30GD-2. Going into a series of error led to the fact that the potential of high-quality low frequency reproductions was originally laid out in the model of radio engineering S-90 and its modifications, even 20-30% of possible.

The huge number of S-90 owners, almost from the moment of the sale of selling in the 80s and until today, try to improve the low frequencies of these columns of the sorcerers with filters, reworking the pipes of phase inverters, strengthening the native corps and filling them out than anything else.

Dear music lovers! I urge you to stop doing nonsense, because It is absolutely useless ... S-90 columns from the plant have a housing with a volume of only 45 liters - not corresponding to the optimal mode of operation of the dynamics installed in it 30GD-2, 75GDN1-4. It is possible to separate it at least the roar of rare rocks and block the porous rubber on all sides - it will not work correctly.

That is, the question of a fundamental improvement in the work of these columns at low frequencies is, if neither regrettable - the issue of replacing the hull, falls in full growth.

The task is somewhat more complicated by the fact that in 30 years it was released great amount Modifications of columns 35as-1 with low-frequency speakers 30GD2 / 75GDN1-4 (8) having a large variation of parameters. In the new buildings, this problem is largely solved and allows the speakers from the earliest issues to the latter to feel correctly. Setting new buildings "stretched" and allows not to engage in the selection of low-frequency speakers specifically.

Middle Frequency ProblemsS-90

Almost all S-90 column owners note nasty ghosts and greater impaired impact on average frequencies that become particularly noticeable on medium and high volume. All ambitious filter alteration projects by installing expensive import capacitors in them, replacing wires, resistors, etc. Like options for gluing on the diffuser of the mid-frequency heads from the tennis ball, etc. Fiaco suffer.

The main reason for unsatisfactory sound on average frequencies is not at all the speaker 15GD-11, but its acoustic design. This "glass" covers the middle head behind has a meager volume and is a second error made by engineers who designed S-90 columns. The "glass" of the mid-frequency head 15GD-11 (20GDS ...) is incorrectly all, ranging from the volume and configuration, ending with internal design. When replacing the S90 speaker housing to the right head of the LF, the mid-frequency speaker should also be issued accordingly.

Of course, the replacement of the "meager" standard cup on optimal in volume and the form of an acoustic design will not make the head 15GD11 by another speaker, but will give her the opportunity to do what she can do initially.

What can I get

As a result, the updated S-90 speakers will be dramatically differently not only on low, but on average frequencies. On the Internet there is a large number of attempts to alteration the S-90 speakers in order to "deceive everyone" and turn them into studio monitors. Attempts relate to everything, only not replacing the main "weak place" - the corps, and most often turn out to be failed. When saving the S-90 speaker housings in a constant form for a cardinal change of sound, you need to change the speakers to modern or design three-track speakers from scratch, to which most music lovers are not solved.

I offer the native set of columns S-90 to leave in untouched form. The value of them in the minimum budget and no matter how UMB, proven decades of operation in the most stringent conditions - performance.

In these columns, there is something that can be improved in principle, it "pull out the maximum possible" from its speakers. To do this, the native set of speakers and filters need to be made acoustically proper housing. As a result, you can go on principled new level The sound quality of these columns, without spoiling.

As a bonus, old housings can not be thrown away and, if necessary, "stock" S-90 collect back and sell any amateur of authentic columns Made in the USSR.

Problems of native jacketsS-90

• The wrong amount of low-frequency design does not give the desired level of pressure on the LF;
• The non-optimal frequency of the phaseinverter setting leads to uneven returns on the LF and poor quality of bass;
• The type of low-frequency design "Phaseinverter" in combination with the "tougy" speaker on a rubber suspension leads to a long and monotonous "buzz" at low frequencies, instead of a clear shock bass;
• Phase-convertible acoustic design leads to significant non-uniformity of sound pressure at low frequencies in the room, and makes requirements for obtaining a high power amplifier;
• The weak walls of the S-90 column boxes lead to the loss of efficiency at low frequencies and give noticeable ghosts when working on high volume;
• Bad sealing of boxes does not even give to work with the design of the S-90 columns in the effluent;
• An extremely small amount of the cap of the mid-frequency head 15GD11 (20GDS-) leads to "grip" of the dynamics of the average frequencies;
• Non-optimal damping of small in volume Boxing leads to a noticeable ghost and "swelling" on the SC;
• The shape and sizes of the S-90 column housings in the effluent requires their installation to furniture, which leads to a "shaky position" of the AU, resonance of furniture on high volume and as a result to the deterioration of the low frequency sound;
• The "low-profile" shape of the column body requires installing them to specialized stands for acoustics, which ultimately increases the cost of the system. Installing the same columns 35as-1 to the floor leads to a lack of high frequencies and incorrect scene.

Advantages of new buildings

• The decoration of the low-frequency head is a quarter-wave labyrinth with its radical advantages on the LF in front of the phase inverter ( detailed description here);
• The optimally calculated frequency and the quality of the quarter-wave resonator setting give a wide strip and the optimal level of low frequencies;
• The highest rigidity of the drawer gives the highest possible efficiency, clean, elastic and hive sound on the NF;
• Hard boxing of a large scope of the head gives a living and open middle and clear vocals;
• The location of the SC and RF speakers on the front panel with the observance of the distances to the walls of the housing on the principle of "golden section" reduces diffraction phenomena on vocals and high frequencies and makes the sound much more comfortable;
• With new housings, acoustics turns into a classic outdoor structure with optimally located at height of the SC and HF speakers;
• The columns are narrower and high compared to the standard S-90 front panels and do not require any supports. The appearance of the columns is improved repeatedly.

On the date page shows the schemes of the Radiotehnika class S90 scheme (35as-212, S90, S90B, S90D, S90F, S-90E), a detailed description, the parameters of the AU, photos.

Pretty high-quality acoustics of Soviet times, after small improvements and restoration with confidence I can say that will give odds to many modern speakers.

If you have been lying on the like or bought somewhat about cheaply, then bring them in order and will still be happy to please you with powerful bars, saturated average and high frequencies in the Musical works of any style and directions, in general, I recommend !!!

Acoustic system S-90 (first model)

Fig. 1. Appearance of columns Radiotehnika S-90.

In the acoustic system there are two-speed playback control regulators separately for medium and high frequencies in the ranges from 500 to 5000 Hz and from 5 to 20 kHz, respectively.

Both regulators have three fixed positions: "0", "- 3DB" and "-6 dB". In the "0" position, the signal from the separation filter is supplied by NP corresponding head directly. In the positions "-3 dB" and "-6 dB", the signal is weakened relative to the position "0" by 1.4 and 2 times, respectively.
With the corresponding spectral composition of the program switching of the regulator, the voice color of the sound is changed.

Passports specifications S-90:

Fig. 2. Schematic scheme acoustic speakers S90 35As-212.

Acoustic system S-90 35as-1

Fig. 3. Acoustic system of radio engineering S-90 35as-1, appearance, photo.

Fig. 4. Schematic diagram of Radiotehnika S90 35As-1.

Acoustic system RADIOTEHNIKA S-90B

Fig. 5. Appearance of acoustic systems of radio engineering S-90B.

S-90D acoustic system

Fig. 6. Appearance of Radiotehnika S-90D acoustic speakers.

The AU has an indication of overload heads of loudspeakers. Regulators located on the front panel of the speakers make it possible to smoothly adjust the sound pressure level of the high-frequency and mid-frequency heads of the loudspeaker ranging from 0 to minus 6 dB.

There is still a model of the speaker system "S-100D", it uses the mid-frequency head of 30 GDS-3 with MAHID magnetic fluid, which allows you to increase the passport power of the acoustic system to 100 W. The rest of the design "S-90D" and "S-100D" are similar.

To operate the AU, you must connect to the amplifier, having the highest (maximum) power at the output of each channel from 50 to 150 W.

If the Overload indicators begin when the speakers are started, then the level of the input signal supplied to it is to be reduced (the volume control in the amplifier to which the AC is connected).

Passport specifications S-90D:

Figure below shows

Manufacturer: On "Radio Engineering", Riga.

Purpose and scope : For high-quality reproduction of musical and speech programs in stationary living conditions. The acoustic system "S-90", developed in 1975, is the first domestic systemsatisfying the requirements of international documents on the HI-FI category equipment. Later models of this AC "S-90B" and "S-90D" are characterized by an extended range of reproducible frequencies. Introduction of the indication of electrical overload of loudspeakers and new external species. Recommended power of high quality household amplifier 20 - 90 W. 35 AC-212 "S-90" and 35 AC-012 "S-90", similar to the AU, the difference is to Guest.

Characteristics

3-strip outdoor speakers with a phase inverter

Range of reproducible frequencies: 25 (-15 dB) - 25000 Hz

Non-uniformity frequency response in the range of 100 - 8000 Hz: ± 4 dB

Sensitivity: 85 dB (0,338 Pa / √WT)

The direction at the angles of 25 ± 5 ° in the horizontal plane and 7 ± 2.5 ° in the vertical plane, from the frequency response measured by the acoustic axis of the AC:

in the vertical plane: ± 8 °

in the horizontal plane: ± 6 °

Harmonic distortion of the AU with a sound pressure level of 90 dB at frequencies:

250 - 1000 Hz: 2%

1000 - 2000 Hz: 1.5%

2000 - 6300 Hz: 1%

Resistance: 4 ohm

Minimum impedance value: 3.2 Ohm

Rated power: 35 W

Limit (passportable) Power: 90 W

Short-term power: 600 W

Weight: 23 kg

Dimensions (VCHHHH): 710x360x285 mm

Set speakers:

LF:

Sch:

HF:

Design

The housing is made in the form of a rectangular unintended drawer made of chipboard, veneer veneer venerable wood. The wall thickness is 16 mm, the facial panel - plywood with a thickness of 22 mm. At the joints of the walls of the housing from the inside, elements that increase the strength and rigidity of the case are installed.

Heads framed each decorative black linings made by stamping from an aluminum sheet with four mounting holes. The head of the sch from the inside is isolated from the total volume of the housing with a special plastic casing in the shape of a truncated cone. The head of the LC is located on the front panel along the vertical axis, and the heads of the sch and RF are shifted relative to this axis to the left and right. The front panel also contains the knobs of the level regulators and RF, and in its lower part there is a plastic overhead panel with a signboard and a rectangular opening of 100x80 mm, which is the output of the phase inverter. On the nameplate, the Curves of the frequency response, corresponding to the different provisions of the level regulators, as well as the name of the AC and the branded sign of the manufacturer. In addition, on the front panel there are sleeves for fastening a decorative frame with a cloth. On the back wall, at the bottom, the block is attached with terminals. Each head from the front panel is protected by a metal black grid.

Internal volume of AC - 45 liters. To reduce the effects of sound pressure and the quality of the sound of the resonances of the inner volume of the case, it is filled with a sound absorber, which is matte from technical wool, covered with gauze.

Inside the case on the same board there are electrical filters that ensure the separation of the band strips. The frequency of the partition between the LF / SC is 750 ± 50 Hz, between the sch / RF - 5000 ± 500 Hz. In the design of the filters and the overload indication unit, resistors are used, MLT, SP3-38B, C5-35I, PPB, MBGO-2 capacitors, K50-12, K75-11 and inductor coils on plastic molding frames.

The package included: four plastic legs, which can be attached to the base of the housing; Removable decorative frame, covered with knitted canvas with high acoustic transparency.

Alteration filter S-90

Having been an opponent of the audiophilia as a simplification, I, after experiments, changed my point of view and is now ready to even sacrifice something for the sake of a small number of obstacles to the sound path :). It is really very important, even on the speakers discussed below. But it makes it also sacrifice some things: the high capacity and loading of frequency bands.

The crossover is the crossover below, I applied for its S-90DE with speakers: 30GD-2, 6GDSh-5-5, 3GD-2, where it just plays wonderful with any genre of music. 3GD-2 (its worst analogue of 6GDV-1-16) is a very old RF speaker (my 1977 instance) with a frequency of resonance AZh 4500Hz (but there is an opinion that in this place it is quite calm), so the high frequency of the account partition HF is due to these facts. Nevertheless, most domestic sakers are not far away, so I consider this cut very good for them.

This filter will work perfectly and on good foreign exchange speakers, which I tried myself :). But, of course, it needs to be changed, taking into account the entire new (frequency of the section including) - as a basis to take the principle itself.

p.S. Yet should not forget that everything in the world is not only relative, but also subjectively :). Besides, I have on this moment At all there are no means of measuring accompanying of your system - everything is adjusted for rumors in the same room ...

dynamics

LF: Consider a good, in general, the bass used in S-90. 30GD-2 (75GDN-1-4) nominal resistance z \u003d 4Ω, sensitivity S \u003d 86DB (or dB / W * M) and frequencies F \u003d 30-1000 Hz provides not the best ICH (impedance-frequency characteristic :)) in the coupe With bad sound at frequencies above 500Hz.

We cut from it to 500Hz. Ideally, to make this speaker work is really good, you need to cut everything from it all that is above 200Hz. After all, the most important disadvantage of 30GD-2 is that at these frequencies he tagged ("sound from under the diffuser cap") and plays completely well. But in order to make such a low frequency of the section, you need an excellent Speaker with a frequency of resonance no more than 70Hz.

CC: standard mid-frequency 15GD-11 (20GDS-4-8), with parameters Z \u003d 8Ω, S \u003d 89DB, F \u003d 200-5000Hz, does not withstand any absolutely criticism or on the sound, nor according to we need characteristics. Therefore, it needs to be replaced with a glorious baby 6GDSh-5-4 (z \u003d 4Ω, S \u003d 92DB, F \u003d 150-12000Hz) which looks completely non-serious, but in fact it turns out very good. In addition, it has the amount necessary for us, the price (no more than $ 4!) And accessibility in Russia.
It should be noted the low power of 6GDSH-5 (as a result, the inability to work on disco / parties) and bursts in some sections of the frequency range ("screaming").

There were opinions that 6GDSH-5 possesses a bad orientation at high frequencies, which is why with a relatively high section of the stereopanorama "unstable". It seemed to me it was not so, so if there are problems, proceed by circumstances :).

HF: Any "Cook" is suitable with the parameters S \u003d 89-92DB and Z \u003d 16. It is important to note F (strictly speaking, the minimum operating frequency of the speaker) - it should not be more than 4500 Hz, and the less, the better.
Design sizes And the attachments are selected on the spot by prickly means.

sensitivity

Sch: To cut off the extra 7dB (92-85 \u003d 6), I suggest using a single resistor version, which will avoid unnecessary elements In the chain and at the same time will reduce the nominal elements of the filter due to raising the speaker resistance. Resistor R2 \u003d 4.3Ω will give us a decrease for 6DB. The reduction in the sensitivity of the resistor is produced in an exemplary ratio of 1 dB / 0.7. The L1 coil has its own resistance 0.75 and will help us to remove 1db. Voila! :)

However, the disadvantage here is that there are no exact formulas and dependencies, and the values \u200b\u200bgiven by me appeared in the trace of my personal sensations.

HF: We act in the same method by selecting the desired resistor until the desired result is achieved. However, in this circuit of the elements of the filter with a large self-resistance, therefore, the R1 resistor must be taken with a reserve for 1 DB. We also note that the volume of the RF speakers relative to others in the system strongly characterizes its "inclinations" - for example, most students like a slightly muted sound of HF (about 1-2DB), the system is like "softer". What is relevant for domestic RF speakers not better quality:)). For heavy music, high-frequency underscore may be more important.

It's nice to know that changes in sensitivity resistors within one unit (1) practically does not affect the filter and cut frequencies, which makes it possible to experiment.

But you should not cross the difference of 0.7oms when experimenting with R2 - the L1 coil is much more sensitive to this change.

inductivity coils

The most difficult thing. It is urgent to find ways to measure inductance, otherwise the exact setting will not work.

For the absence of a way to measure, I propose the following: Compare coils for your own resistance, taking into account all the structural parameters. Theoretically, if all factors affect the nominal inductance (there are quite interesting - the density of the turns, the content of iron impurities in the frame :)), then you can get the necessary inductance, as if "sample".

Despite everything, this method, you need to say, is very inaccurate. The difference between the inductance L2, for example, 1.5MGN and 1.27MGN for resistance.

LF: I will give my parameters of a large coil (she has more "ears" on the sides): the inner diameter of the ring: 35mm, external: 70mm, the height of the coil: 37mm, the width of the winding area (height without sideboards): 30mm, the thickness of the wire (copper, enamelled ): 1mm. With these parameters, the resistance of the coil dC (measured by a digital tester): 0.8.
If these parameters are met, you should get inductance in the area 1.0-1.6mgn, congratulations :).

You can wind the coil "Old Dedovsky" way, knowing how much turns need to be done. Recently, it became known: for 1.27mGH, 210 turns are needed "manual" (not very neat) winding. At the same time, for every 0.05mGN accounts for about 5 turns.

Sch: Small coils must be all the same in the frame, I took with the smallest inductance. Inner ring diameter: 12mm, external: 32mm, coil height: 23mm, winding width (height without sideboards): 18mm, wire thickness (copper, enameled): 0.5mm. Resistance: 0.7Ω, inductance 0.18-0.21MMN.

At 0.18mGN, the number of turns is 127 pieces. At 0.21mgn - 136.

By the way, do not repeat the mistakes of the USSR-collectors, do not secure small coils with screws inside - the inductance will change and nonlinearity will be added; Bold on glue.

For those who measure himself: it is useless to try to rewind a small coil with a thick wire from great, and you probably want to do it :). Even wounds completely the entire frame, I did not receive the inductance of more than 0.1MG.

At the same time, if you build a new optimal frame (see links, "CEC"), which is not so simple as it seems, then the coil's own resistance to allow 1 DB to sensitivity to the speaker - it will be necessary to calibrate the sensitors of sensitors to the speakers.

If you try to find somewhere else the same big frames and wind the L1 coils with a thick wire, then their resistance will turn out about 0.4. - Also better.

p.S. I ask you, do not write me letters with a request to help calculate this method inductance on other frames and other nominal. Collect the "box" (see links), it is very easy and solve all your problems with the exact winding coil.

condencators

Everything is extremely simple. It is necessary to find the same values \u200b\u200bof decent in terms of the quality of capacitors, about the types can be found here, there is also about resistors, by the way. Capacitors can be combined (summarizing) in parallel (as well as decreased by the rule of resistance connecting sequentially). If you disassemble the S-90 filters, then you already have a good set of desired tanks :).

From domestic, instead of probably a film k73-xx, I recommend trying the metals of MBX - more "soft" sound. In the presence of funds and accessibility, it is desirable foreign MKP (1MKF ~ $ 1.1, a domestic analog - K78).

Condenters, of course, non-polar and voltage at least 40V. The quality of elements in Tsobel chains is as important.

Here you can experiment with a change in the "color" system, which is given by condensers. I recommend to try to hide all the capacitors (except those in the chain of the Tsobel) are small (in the area of \u200b\u200b0.1MKF) condensers of others, usually better quality, types. For example, a polyster (K71-7) or mica (SGM) - as a result, a more detailed sound on the middle frequencies is obtained and the transparency of the system increases. In addition, metal-paper (MBX) capacitors give a little "muddy" sound. Shunt - it means to combine together in parallel :).

resistors

With a capacity of at least 2W, with smaller overheating and change of the nominal value is possible. From domestic, you can apply MLT-2. The Pav-10 from the S-90 set is not the best, but fasten the heart ... I recommend Chinese ceramics - it looks like white teeth, it is large, inexpensively for sale everywhere in radio markets (power up to 15W), but the variation of the denominations is fully present.

In other words, low-power MLT resistors are perfectly operating on non-discontinuous facilities, at least in place R1.

I ask you to pay attention to the fact that the nominal written on the resistor is not necessarily the same thing that actually. I strongly recommend selecting resistors measuring them with an ohmmeter / tester. The scheme shows clearly extremely measured resistors.

With the final assembly of columns, it is very strongly recommended to put resistors R1 and R2 as close as possible to the speakers - right on the terminals. This will make it very much to reduce the effect of the cable (which after these resistors, but not to them) on the sound.
chains Tsobel

The reason is that the impedance of the dynamics is inconsistent and grows with a decrease in frequency return. This effect takes place in all the heads of dynamic type without exception, regardless of the country and year of production. More precisely, the Tsobel chain (in my filter, only a simplified version is applied; full allow you to adjust the impedance at low frequencies, which is not always necessary) is necessary for normal operation of the filter inductance coils, with a sufficiently large self-inductance of the coil of the speaker. Without the chain of Tobel, the work of the inductor as the FNH is rudely broken and the filtering is practically not carried out at all (!).

LF: elements R4 and C4. C3 It is advisable to put more than 60μF, but also, for the frequency of the section in 500Hz is enough. R4 is equal to 4.3.

Compare ICh 30GD-2 without Tsobel and with it. The graphs are approximate, but there you can see the frequency of the s-90 phase inverter setting - the second huge cliff on the left, before 100 Hz :).

Sch: Ichh 6GDSh-5. You can try to smooth above 3kHz Tsobel R3, C3. For this, there will be enough 10-20MKF and resistor 8.0.

IMPORTANT: The Tsobel chain is mandatory for the normal work of this crossover. Without it, the "new light filter" showed its complete inconsistency on SC-HF.

HF: Due to the low inductance of its own coil, the dynamics and a cut on low frequencies chain is irrelevant.

filter

In all frequency elements, a passive multiplying filter of the first order with attenuation of 6DB per octave is applied (frequency change), the approximation on the batterworth. Actually, the filter itself is counted by the JBL Speaker Shop program and a little fit manually :)).

LF: low frequency filter. As it was already possible to understand, the frequency of the cut 500Hz (for 30GD-2 / 75GDN-1-4 is desirable below, but is selected as a compromise to 6GDSH-5). Provided by an element L2, the load of the dynamics in a compartment with a simplified Corrective Tsobel chain.

Sch: strip filter. The lower part (C2) is agreed with the Filter of the LF and is configured to the frequency of the 500 Hz, based on the consideration of the resonant frequency of 6GDSH-5. The upper part (L1) is agreed with the Filter of the RF link and is set to 7500 Hz, which allows you to make a broadband dynamics structure, in a compartment with a grade.
Both parts are loaded on 8Ω (4Ω from 6GDSH-5-4 + 4Ω from R2).

HF: high frequency filter. The frequency is coordinated with the top of the Schlv link filter and works at 7500Hz, which avoids problems associated with the high frequency of the main resonance of domestic RF speakers. Load 21) (16 voltage + 5Ω from R1).

All speakers are included in the simphanist, which is less affected by the phase characteristics of the system.

scheme

Scheme, electrical concept. Click to enlarge :).

Arrower on the right shows "Sound input" from the amplifier. Dotted lines This Bi-Wiring (LF and SC-RF Filter Units are connected together in parallel at the amplifier - plus LC with the plus of the SC-HF to the winner of the amplifier, the minuses are similar).

Gray numbers in brackets over filter elements - their load. Gray numbers with "R" in front of them - own resistance of the element. Gray marks -1db - loss of sensitivity of the speaker on the elements.

Near the speakers briefly discharged their important characteristics, the frequencies of the bands / links are indicated below.

Inductance in MGN, capacity in the ICF, resistance in Ohm. After collecting the filter, the nominal resistance of the column for the amplifier remains equal to 4.

A variant of the "new light" filter for clones S-90, more precisely for orbit 35as-016. Dynamics: 10GDV-2-16, 6GDSh-5-4, 75GDN-1-4 is a fairly common set.