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15594A Low Pass Crossover/Equalizer Module

 

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1597B Passive Monitor Panel

DESCRIPTION
The ALTEC LANSING Model 15594A is a fixedfrequency low pass crossover filter and combination woofer/enclosure equalizer module. The module plugs directly into the powered octal accessory socket of the 9444A or any otherAnniversary Series power amplifier product. When used with the 15595A high pass crossover module, they eliminate the need for rack mount electronic crossovers and offer the ability to individually equalize specific woofer/enclosure (or horn/ driver) combinations.
The third-order Butterworth low pass filter has an 18 dB per octave (60 dB per decade) roll-off rate. The modules are available in the following standard ISO frequencies: 125 Hz (15594A-125), 500 Hz (15594A-500), 800 Hz (15594A-800), and 1,250 Hz (15594A-1250). Simple equations are provided to calculate other frequencies for custom applications.
Each crossover module is provided with a "flat" woofer/enclosure equalization submodule. The submodule provides a maximally flat response with a 12 dB/octave low frequency roll-off beginning at either 16 Hz or 32 Hz, depending on orientation. Other responses, including low frequency peaking, may be calculated from the simple equations provided to optimize a loudspeaker system.
The 15594A is housed in a snap-a-part case which simplifies the installation of any submodules and eases service. All power is derived from the powered octal accessory sockets on the amplifiers. This negates any need for an external power source.
The ALTEC LANSING Model 15594A Low Pass Crossover/Equalizer Module has the flexibility to meet or exceed the requirements for any job. Its ability to produce a flat power response for an individual loudspeaker system is not only useful but almost mandatory in today's professional installations.

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