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Model DDA-1x8SH
Radio Systems, Inc.

Combining the best of two worlds - Radio Systems' famouse ultra low-noise and low-distortion Audio Distribution Amplifiers are now available with StudioHub+ connectivity.

StudioHub+ provides instant plug-and-play RJ-45 stereo connections to DA inputs and outputs, speeding initial installation and simplifying changes and troubleshooting. Wire all connections with CAT-5 twisted pair or use pre-made standard Ethernet-style patch cords for additional wiring efficiency.

All "SH" model products are circuit optimized for CAT-5 connectivity performance. This means that the inputs use instrumentation amplifiers, for ideal differential input balancing, ensuring the units excellent crosstalk specifications. Outputs utilize "electronic transformer" floating circuitry allowing traditional transformer style (one leg tied to the ground) wiring to unbalanced sources with maximum output levels unaffected.

  • Stereo / Eight Output Configuration
  • StudioHub+ RJ-45 rear panel connectivity
  • Front-Panel L/R level sets
  • Internal low-noise torroidal transformer
  • Front-Panel audio presence and overload LED indicators
  • 110/220 Volt internal voltage selectable


Frequency Response
+0, -/1dB / 20Hz - 20kHz

Distortion THD+N
.002% / 20Hz - 20kHz, any output level from +4dBm to +24dBm (with 600 ohm load)

Distortion IMD SMPTE
.003% any output level from +4dBm to +24 dBm (with 600 ohm load)

Distortion DIM
.002% any output level from +4dBm to +24 dBm (with 600 ohm load)

-105dB / 20Hz - 20kHz

102dB below +4dBm output level unity gain measurement bandwidth 20Hz - 20kHz with 600 ohm input and output termination

21dB aboive +4dBm output (with 600 ohm load)

Dynamic Range

Inputs - 1 Stereo
Input Type
Instrumentation Amplifier

Maxium Input

LED Audio
-24dBm input level audio present trip point

Input Indicators
+24 dBm input level audio overload trip point

Outputs - 8 Stereo
Output Type
"Electronic Transformer" floating output

Maximum Output
+25dB over 20Hz-20kHz

Maximum Gain
Jumper selectable for: 16dB, 26dB, or 36dB

-50dB over 20Hz-20kHz

Output Impedence
60 ohms

19" wide x 1.75" (1 r.u.) high x 7" depth
48.3 wide x 4.4 (1 r.u.) high x 17.8 cm depth

8 lbs. / 3.6Kgs
23" x 13" x 3" / 58.5 x 33.7 x 7.7 cm

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Radio Systems, Inc. • 601 Heron Drive • Logan Township, NJ 08085 USA • Phone: 856-467-8000 • Fax: 856-467-3044