Musical instrument crossover circuits and method of using same

Abstract

A musical instrument amplifier system (FIGS. 1 and 2) with a frequency selective crossover circuit (10) using passive band pass filters (36, 44) to separate the amplified signals from the power amplifier (14) of an amplifier system (12) into low frequency signals on an output connector (42) for a specially adapted bass audio speaker (38) while the higher frequency signals are applied to another speaker (46). The crossover circuit (10) is selectively connected with the normal speaker output (24) in lieu of the speaker (38) to add frequency crossover capability to any amplifier system. In another musical instrument amplifying system (88), the crossover circuit (FIG. 4, 122, 124, 130, 132) is internal to an amplifier system (90) and produces preamplified low frequency signals on a special output terminal (102) for power amplification by an external power amplifier (94) while the preselected low frequency signals are blocked from the internal power amplifier (118) so it produces only the relatively middle and high frequencies at the normal speaker output connector (98). The preselected low frequency signals bypass a special effects section (112) so that special effects is selectively only produced by the internal power amplifier (118) in the relatively middle and high frequency range, while the power of the external bass power amplifier (94) is separately adjustable from the adjustment to the power level of the internal power amplifier (118). When the external power amplifier is disconnected, the internal high pass filter (124) blocking low frequency signals to the internal power amplifier (118) is automatically removed to allow full frequency amplification by the internal power amplifier (118).

Dependencies are inferred from the claim text.