Refinement of the Radiotechnik S-30b speakers. Scheme, description

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Refinement of the Radiotechnik S-30b speakers - budget Hi-Fi for ridiculous money. Encyclopedia of radio electronics and electrical engineering

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Brief characteristics:

Speakers - 6-GDV-1-16 and 25GDN1-80-8
Passport power 30W
Rated 10W
frequencies 50-20000Hz
Sensitivity 85dB.
dimensions 374*214*195mm
Weight 5,5 kg.

Refinement of the Radiotechnik S-30b speakers. Speakers Radiotechnika S-30b

The characteristics, I must say, are not very ... Or does it seem so to me from the height of the S-90? Moreover, I still remember how I brought them (this is not an S-90 for you, take a column in your hands and go!) and zafanovat. To my then ears, the sound was just right! So thoughts like - S-30 ha .. but rejected right away! There are no bad speakers, but there are stuck ears :).

Therefore, dedicated to all owners of the S-30. If you are already fed up with their sound, and finances do not have to buy more, read the following:

So, in the presence of S-30 2 pieces, a soldering iron, straight arms, improvised material: cotton wool, felt (batting, linoleum), copper wires (at least from wiring, single-core ones are recommended, with a cross section of 2,5 mm2), plasticine, rubber, circuit speakers, free time and the desire to modify unlimited.

We remove the front panel (8 bolts) and both speakers (in the 30s, oh horror, they were not even soldered to the wires, but on the connectors! ...) Remove the back cover (nameplate) with the filter.

Let's start editing:

1) We seal the body (we coat all the seams with plasticine or sealant), during this time the soldering iron heats up.
2) Let's take care of the filter: Turn off the overload indication unit (if the amplifier is not more powerful than 25-30 W - otherwise then we listen with caution) - according to the scheme, we cut the track from the input (red wire +) to VD KA522B (see diagram) and solder the capacitor C2 10 uF and transistor VT2 KT315b.
We cut off the XP plug connector and solder the wires going to the speakers (we throw out the old ones! We put in their place audio wires with a cross section of at least 2,5 mm2, in extreme cases, copper wires from the electrical wiring) directly to the board, on the reverse side of the connector. From the bass player (woofer) "+ " to connector #2 and "-" to connector #3. The tweeter (HF), respectively, "+" to No. 5 and "-" to No. 2 (as it should be - it is in antiphase).
Finished with the filter.
3) Corps. We dampen - we upholster with batting, felt, an old blanket, fiberglass, felt-based linoleum (choose a sound absorber to taste among the material at hand), preferably in several layers and alternating them. This is the most dreary, due to the small volume. The main thing is not to stifle the volume!
4) We put in place the back cover with the filter (on plasticine / sealant).
5) We fasten the squeaker (pre-soldered (soldered! In no case on the connectors) to it the wires, observing the polarity and taking into account the antiphase!) Through the rubber gasket and sealing with plasticine.
6) We sew a bag for cotton wool (although you can use what it was - like from a synthetic mesh) We fill it with cotton wool (how much it was. About 1/3 of the body volume, do not forget to fluff) and place it in the upper part, preferably to one of the walls for asymmetries.
7) We solder the bass player (again, observe the polarity!) And put it into the case through the rubber gasket. We fasten it with screws (we also pass the screw heads through the rubber gaskets) and seal it around the perimeter with plasticine.
8) Remove the protective gratings from the front panel from the tweeter and, if desired, from the woofer.
9) We put the front panel in place (it is advisable to put foam rubber under it where necessary so that it does not resonate).
With the finalization of the column everything!
Now we finish the second column and enjoy the sound. Already the first minute of listening will show a clear improvement in sound. The characteristic 30th bubbling on the bottoms will almost disappear. An order of magnitude to improve high. The sound will become softer or something. The middle will appear and the bass will soften. Okay, listen to yourself. The sound is hard to describe in words :).

Attention! It is necessary to pay attention during assembly so that the phase inverter is not closed by anything and has direct access to the woofer cone! Also, special attention to the observance of phasing!

If, despite the refinement, you soon want more, then we continue the budget turing:
A) We put copper wires to the speakers (at least the same wiring). Watch out for polarity!
B) We grind the spikes (there will be an article about them soon) and put the speakers on them (with a very budget refinement, we drill the bottom of the case and put on 3 M10 bolts, pointed from below)
B) Modifying the amplifier
D) We put a normal interconnect cable from the sound to the amplifier.
E) Shield the sound card (If the speakers play as part of the computer's speakers).

PS As always, it will not do without minuses. After the above, you will obviously have to buy another HDD for music ... Since MP3 at 128 Kbps will become impossible to listen to - only 256-320 (but that's a completely different story ...).

Author: Sergey Zhiltsoff aka Serzhi, serzhi@tut.by; Publication: cxem.net

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Comments on the article:

Vasilii
In my S30s (without b), I just pasted the walls with felt, replaced the wires. I consider them to be more successful acoustics than the S30b, because they do not have stupid bells and whistles such as overload protection and a phase inverter, although at the same time they reproduce the bass "God forbid" and at the same time there is no mumbling.

Denis
Question to the author, why cut the track on the diode? Can it just be soldered?

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