The Symetrix 305 Distribution Amplifier shall be a one channel audio distribution amplifier consisting of one electronically balanced input amplifier and four electronically balanced output amplifiers. There shall be a master gain adjustment circuit capable of up to 15dB of gain or 15dB of loss for the purpose of optimally matching incoming signal level(s). There shall be a four-LED array for the indication of the signal level applied to the output drive circuits. The LEDs shall be labelled CLIP, +10, 0, and -10 corresponding to internal signal levels of +18dBu, +10dBu, 0dBu, and -10dBu.
The output shall be capable of driving a 600- ohm balanced load to a level of +22 dBu. The maximum output level into a balanced bridging load (20K Ohms) shall be +26 dBu. The output will offer an individual attenuator with a range of 0 to -20 dB. Frequency response through the amplifier shall be �1/2 dB, measured between 20 Hz and 20 kHz. THD+Noise shall be less than 0.009% measured at +26dBu with a band- width of 30 kHz. Residual noise will be >100 dB below a +4 dBu input signal when measured with an A-weighting filter.
The unit shall occupy half of the width of one rack space. The physical dimensions shall be 1.75"H x 8.5"W x 6.5"D; 4.445cm H x 21.59cm W x 15.875cm D. The distribution amplifier shall operate by means of a Symetrix PS-3 or PS-3E power
supply connected to 117V AC nominal, (95-130V AC), 50-60 Hz or 230V AC nominal, (165-255V AC), 50 Hz.