Patent
1977-01-21
1978-11-07
Olms, Douglas W.
179 1G, H04R 2900
Patent
active
041247868
ABSTRACT:
The present invention relates to a passive speaker comparator which allows performance comparison of various speakers utilizing the same program source at the same listening volume level in an audio system providing an audio source and various preamplifying and amplifying gain stages, comprising, housing means, an impedance matching network operably mounted on said housing means, a plurality of adjustable attenuators operably mounted on said housing means and connected electrically to said impedance matching network, said network and attenuators disposed electrically between the appropriate preamplifier and amplifier gain stages, a plurality of attenuator switching means operably coupled to said network and, a plurality of speaker switching means operably connected to the output of the appropriate amplification stage and a plurality of speaker connector means operably connected to said speaker switching means, such that a preset attenuator is disposed between the appropriate preamplifier stage and the appropriate amplifier stage at the same time as a selected speaker or speakers connected to the speaker connector means is connected to the appropriate amplifier stage by the said speaker switching means.
REFERENCES:
patent: 2224909 (1940-12-01), Hackley
patent: 2489008 (1949-11-01), Callender
patent: 3784748 (1974-01-01), Brinkerhoff
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