Radio - DA-4x4a - Signal Distribution Amplifier

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Radio Systems' DA-4x4a may be the best DA ever made. Radio lowered the noise to a whisper at 102 dB below +4 dBm out with an internal toroidal transformer that dramatically reduces internal electrical interference fields. Distortion in the DA-4x4a is so low that it is hard to measure as a result of low noise op-amps and a careful design of the output amplifiers.

Features:

Versatile configurations- quad, stereo or mono
Front panel individual output level sets
Internal torroidal transformer
Super-low noise and distortion specifications
Individual rear panel removable I/O barrier strip connectors
110/220 volt - CE certified
Front panel audio presence and overload LED indicators
Also available: DA-2x4a with stereo and mono configurations

Specifications:

Channels	4 inputs x 4 outputs (DA-4x4a) 2 inputs x 4 outputs (DA-2x4a)
Front Panel Indicators	Power, audio level illuminates at -24 dBm (one per input channel), peak level illuminates at + 24 dBm (one per input channel)
Input Impedance:	40K ohms, balanced and bridging
Input Gain:	0 to +36 dB (16 dB, 26 dB, 36 dB – jumper selectable)
Output Impedance:	60 ohms, balanced
Maximum Output Level:	+25 dBm (into 600 ohm load)
Frequency Response:	+0/-.1 dB 20 Hz to 20 kHz
Distortion: (thd + n):	0.002% 20 Hz to 20 kHz (any output level into 600 ohm load)
Distortion: (SMPTE imd):	0.003% (any output level into 600 ohm load)
Distortion: (dim)	0.002% (into 600 ohm load)
Noise:	102 dB below +4 dBm (full bandwidth into 600 ohm load)
Output Channel Isolation (crosstalk):	-105 dB (full bandwidth)
Dynamic Range:	123 dB
Headroom:	21 dB above +4 dBm output
Common Mode Rejection:	-50 dB (full bandwidth)
Dimensions:	19 inch (EIA rack mount) wide x 1.75 inches (1ru) high x 7.75 inches deep (with connectors)
Shipping Weight:	8 pounds