Subwoofer 52wSUB2L-2. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Speakers

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Name

All things should have a name and I decided to name my sub, more precisely, figure out how to name this sub model (it’s just that this homemade sub is not my first and not the last), so I decided, so come up with a name. The name should reflect some of the main technical. characteristics and the first option was 52w2dl (XXwYdZ).

Where XX - power w - watts Y - number of speakers d - speakers Z - speaker frequency (l - LF m - MF n - HF a - broadband). But then I changed the labeling, because the first one could not tell about the AU in full. The second and final version is 52wSUB2L-2 (AAwBBBCD-E). Where AA - AC power w - watts BBB - AC type (Sub - subwoofer Sat-satellite) C - number of speakers D - speaker frequency l - LF m - MF n - HF a - broadband) and E - resistance.

Costs

Because I live in Belarus, then our prices are different. I will quote here prices in Belarusian rubles and US dollars.

1. Speakers (2 pieces, speaker parameters will be given below) - 70 rubles. (000$)
2. I didn’t have to buy plywood 10mm 150x45 cm in the basement, but such a piece costs 27 rubles in the store. (500$)
3. Glue (For gluing the sound absorber to the walls of the case) - 560 rubles. ($0.25)
4. Cotton wool 150 g - 1 rubles ($650)
5. Film for pasting the case 150x45 cm - 4 rubles. (650$)
6. Clamp connector 1 500 rub. (0.7$)
7. Wires for internal wiring 1m 2.5mm 1 250 rub. ($0.45)
8. Coil and capacitor (for low-pass filter) 800 rubles. (0.3$)

Well, that's all, according to the results, the total costs amounted to 107 rubles. ($910). Good price for a homemade sub. Such category and power.

Speakers

The speaker options are:

1. Rated power 30 W
2. Maximum power 100W
3. Diffuser diameter 14 cm
4. Xmax 12mm
5. Resonance frequency 29 Hz
6. Effective frequency range (FR) 28 - 5 Hz
7. Full frequency response 18 - 16 Hz
8. Weight of one speaker 1.5 kg
9. Diffuser material thick black cardboard
10. Coil diameter 20 mm
11. Speaker dimensions 16 cm diameter, ~ 9 - 11 cm depth
12. resistance 4 ohm

Well, that's all I know, I don't know the name of the model, but I only know the manufacturer, it's BLAUPUNKT.

Filter

Well, what can I say about the second-order filter, put a 4A fuse. Well, see the rest in the diagram (Fig. 1)

Since there are few parts, the filter can be made according to a hinged scheme (without a board). The fuse is best done on the connector. If you often listen to music at high volume, the fuse may blow. The circuit can be supplemented by adding an overload indicator (Fig. 2) and something else, for which there is still enough mind.

R1 is selected by random. The principle of operation is as follows, when the power going to the speakers exceeds 52W, the HLR1 LED starts to glow. C2 is needed in order for the indicator to glow for as long as possible so that you can notice this overload and reduce the volume on the amplifier, it is best to take the capacitance of capacitor C2 200 - 2200 uF x 40 V. What else to add to the filter, I don’t know, you can try bi -wiring for a subwoofer would be funny.

Chassis

I made the case from 10mm plywood (I know that the walls are thin for a subwoofer and vibrate a little when playing, but there was no other way, and spending 40 rubles ($ 000) on a chipboard sheet the same size as the piece of plywood I used was would be stupid, since it would give little effect, but the price would become much more instead of $ 18, the sub would cost $ 50). The drawing of the sub is visible in fig. 68.

The type of acoustic design that I have chosen is a closed box (CB). only this type of design fits the parameters of the speakers. The volume of the box was calculated and amounted to 20.7 liters. This corresponds to the dimensions HxWxD 21x43x23cm. Inside the walls of the case are upholstered with cotton wool, its thickness was about 5 mm, cotton wool was glued to the "super moment" glue.

frequency response

In the case, the reproducible frequency range turned out to be 22 - 780 Hz (Fig. 4).

I cannot guarantee the accuracy of the frequency response. I shot it not with a special microphone, but with an ordinary one, and therefore there may be inaccuracies, but small <10%.

Listening

The sound of the sub is decent. I experienced the sound quality on familiar tracks that I had previously listened to without a subwoofer. The sound reproduced by the subwoofer turns out to be quite good and dense (a merit of SG). The only thing that spoils the overall picture is that the frequency range of the sub that it reproduces loud enough to be heard is 22 - 780 Hz and as you probably remember the resonance frequency of the speakers is 29 Hz so when the sub plays this frequency there is a clear rise and rumble. But this can be eliminated by adding a sound absorber, but I don’t have time to redo the sub.

Technical X-Ki of the finished sub:
Rated power ................................... 52 W
Maximum power ............................... 110 W
Frequency response .............................. 22 - 780 Hz
Signal / Noise ............................................... >= 60 dB
Speaker cone diameter ................... 2x14 cm

Author: Nem0, Belarus; Publication: cxem.net

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