Loudspeaker with rigid foamed back-cavity

Details Loudspeaker with rigid foamed back-cavity Loudspeaker with rigid foamed back-cavity

1976-11-24

1978-11-28

Stellar, George G.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

181146, 181151, H04R 128

Patent

active

041277511

ABSTRACT:
The rear cavity of a tweeter speaker includes a cylindrical block four of a rigid, open celled, homogenous foamed material, such as aluminum. The rear end of the cylinder is cut to expose open cells, and is coated with an impermeable resin film, whereby the block absorbs and dampens back-pressure vibrations within the speaker cabinet from the low frequency woofer, and reduces standing and reflected waves generated by the tweeter. Alternatively, the entire block may be enclosed within a case five.

REFERENCES:
patent: 3720285 (1973-03-01), Russell et al.
patent: 3944757 (1976-03-01), Tsukamoto
patent: 3982607 (1976-09-01), Evans

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