INPUT: Identical left and right channels match any dynamic or capacitor microphone needing an input impedance of 150 to 600 ohms. Differential input when using the XLR input connector if your microphone can use this feature. +5 volt phantom power through 6800 ohms for low voltage electret condenser microphones. (To use dynamic mics the phantom voltage can be disabled for either or both inputs with internal push-on jumpers.)
GAIN: Each channel has an independent gain control. Times 10 to 1000 (20 to 60 dB) in 4 dB steps using two 11-position rotary switches.
RESPONSE: Each channel an "A", "B" or FLAT response as selected by a 3-position rotary switch. A four-pole Butterworth lowpass filter with a 25 kHz cutoff frequency reduces high frequency noise and serves as an anti-aliasing filter when driving a sound card input.
DYNAMIC RANGE: Over 60 dB at 60 dB gain, over 80 dB at 40 dB gain and about 90 dB at 20 dB gain. See Figures 1, 2 and 3.
Fig. 1 -- Output spectrum. 1 kHz sinewave input, 20 dB gain and flat frequency weighting.
Fig. 2 -- Output spectrum. 1 kHz sinewave input, 40 dB gain and flat frequency weighting.
CROSSTALK: -55 dB at 1 kHz and 10 kHz with both channels set to 60 dB gain and maximum signal output in one channel.
CONNECTORS: Two input connectors for each channel: 3-pin female XLR microphone connector and female RCA. Three output connectors: left RCA, right RCA and 1/4 inch stereo phone jack. 2.5 mm male input power connector. A red LED lights when the power is on.
POWER: The 24 VDC power supply plugs into any (US) standard 115 VAC, 60 Hz outlet. (Power supplies for other mains voltages and outlets available on special order.)
FURNISHED: 24 VDC wall power supply, Printed User Guide
PHYSICAL: Cast aluminum enclosure measures 248 x 158 x 63 mm (9.9 x 6.3 x 2.5 inches) overall including connectors and knobs. Weight is 932 gm (2.1 pounds). There are rubber bumpers on the four corners of the bottom of the enclosure.
PRICE: See price list. PRICES
