Subwoofer from improvised materials. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Speakers
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For a long time, domestic AS Electronics 015 based on 75 GDN-1-4 were gathering dust in the corner, and this bothered (it's a pity to throw it away). And there was no subwoofer in the car, however, then I leaned on getting a decent sound from one "head". Well, it so happened (in May) that "1" as a mark for the subbass began to annoy me, but here in the corner of the dynamics.
By June, the concept was born: Closed Box with isobaric inclusion of speakers with separate power supply (each to its own channel of amplification). The amplifier was chosen CRUNCH POWER ONE X2100 (2x100 Watts at 4 Ohms) for its filters (12 dB / octave, cutoff frequency is adjustable from 40 -150 Hz, and there is also a bass boost, but I didn’t have to use it in the future).
The stages of the "great journey" are reflected in the pictures:
1) Definition of parameters. The results were obtained by recalculating the finished NPP structures
2) The design option (Custom) was calculated; Such a box was chosen for its "insensitivity" to the parameters of the speakers. When changing the parameters +/-50%, the frequency response in the cabin remained within the "limits".
3) On the graph (red line) for parameters TS 35, 0.5, 80, and crimson for calculated parameters. The rise in the frequency response of the cabin is adopted 12 dB / octave from 70 Hz. The parameters given in some reference books are unrealistic, since nothing similar to the S-90 and 35AC-1 can be done on such speakers.
4) Here is a box cut in profile. In full face, it is almost a square with a side of 37 cm. In the car, this contraption was installed close to the back of the rear sofa with a speaker towards the back door.
A few words about the design of the hermetic volume between the speakers, then the torus. Four 4x4cm bars of the same height (~11 cm) are fixed to the front shield with screws and glue. From the inside of the box, a rectangular plate (or ring) 15-20 mm thick with a hole for installing an internal speaker is mounted on the bars. Further, a cylinder is made of thick paper (cardboard), which is glued along the inner circumference of the mounting holes for the speakers on the front shield and on the ring, forming the inner surface of the torus. From the outside, the sections between the bars are filled with foam, which, after drying, is cut off along the outer surface of the torus. When the foam dries, the cardboard ring is impregnated with a moisture-resistant compound, I used an anticorrosive spray. The cable to the external speaker is laid through a hole in the wall of the torus, which is sealed with the same foam.
Publication: cxem.net
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