Loudspeaker System Specifications
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Architectural and Engineering Specifications
The powered loudspeaker system shall have a frequency response from 46 Hz
to 180 Hz with the Crossover knob turned all the way CW, and from 46 Hz to 90
Hz with the Crossover knob turned all the way CCW, at the - 6 dB points. The
peak SPL with inaudible distortion shall reach 127 dB with music as a source,
when measured at a distance of 1M and driven to full output capacity. The
system shall utilize a premium 18" heavy-duty woofer in a vented enclosure
tuned to 38 Hz.
The powered loudspeaker system shall have an input channel consisting of a
medium impedance balanced input connector consisting of one combo female
XLR and 1/4” TRS phone jack on the rear panel. A Ground Lift Switch shall be
provided to allow the disconnection of the input cable shield from the system
ground to provide for breaking any possible ground loops.
There shall be a Direct Thru (output) connector consisting of a male XLR jack.
There shall be two female XLR jack filtered high-pass outputs providing a
crossed over signal to satellite speakers.
The system power amplifier shall have an unfiltered frequency response of 20 Hz
to 20 kHz which deviates no more than +1, -3 dB up to rated power, hum and
noise better than 90 dB below rated power, and THD typically of less than 0.1%.
The power amplifier shall be capable of 500W sine wave output into a 4 ohm
nominal load, and 1000W peak available power, and shall incorporate DSP
controlled signal compression and limiting.
The input signal shall be electronically divided into high frequencies and low
frequencies by a Linkwitz-Riley fourth order slope line-level crossover, with
crossover frequencies variable from 90 Hz to 180 Hz via a rear panel Crossover
knob. The low frequencies shall be processed to provide bass boost, subsonic
filtering and overall response shaping, and the high frequencies shall be made
