ARCHITECT'S AND ENGINEER'S SPECIFICATIONS

The high pass filter shall be a third-order Butterworth for maximally flat response with an 18 dB/ oct stopband attenuation rate, and shall have a fixed corner frequency located on one of the standard ISO frequencies. The filter shall have an electronically balanced input, an unbalanced output, and a male octal plug, and be fully compatible, both physically and electrically, with ALTEC LANSING's Anniversary Series of power amplifier products.
The filter shall include additional circuitry and a female connector socket for the acceptance ofan optional plug-in equalizer submodule assembly. The circuitry, in combination with the submodule assembly, shall equalize specific horn/ driver combinations for a flat power response. The circuitry shall be compatible with ALTEC LANSING's 9600-series of horn/compression driver equalization submodules.
The high pass filter and horn/driver equalizer shall be the ALTEC LANSING Model 15595A-125, 15595A-315, 15595A-500, 15595A-800, or the 15595A-1250.