MCM Electronics

EZ Series Headphone Distribution Amplifier 4 3.5mm Rear Panel OutputsMCM Part #: 555-0666  |  Radio Design Labs Part #: EZ-HDA4B

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1X4 Headphone Distribution Amplifier Rear Panel Outputs

The EZ-HDA4B contains four stereo headphone amplifiers with individual front-panel volume controls. Headphone outputs are provided on rear-panel MINI jacks. One stereo input signal feeds all the amplifiers. Stereo RCA jacks, a MINI jack and a 1/4" jack are provided for connecting the input source. The EZ-HDA4B is used in music stores, houses of worship, studios, museums, home component systems and commercial sound systems.

Includes a North American power supply

Product Description


  • One Stereo Input to Four Stereo Outputs
  • Unbalanced Inputs on Rear Panel
  • Input on MINI, 1/4" (6.3 mm) or RCA Jacks
  • Headphone Outputs on Rear Panel
  • Outputs on MINI Jacks
  • Front-Panel LEVEL Control for Each Output

Inputs (3): Stereo on dual RCA jacks, stereo mini jack or 1/4” (6.3 mm) TRS, > 10 kO, -10 dBV nominal, +8.5 dBV max. (RCA and 1/4”), -16 dBV nominal, +2 dBV max. (Mini)
Outputs (4): Stereo on Mini jacks (rear panel), 60 mW (100 O load)
Level control: Off to +2.5 dB gain (RCA and 1/4” inputs, 100 O output load), Off to +9 dB gain (Mini input, 100 O output load)
Frequency Response: 20 Hz to 50 kHz (±1.5 dB, 100 O load)
THD+N: < 0.1% (10 mW output, 100 O load)
Crosstalk: < -75 dB (1 kHz)
Noise: < -95 dB (below 10 mW output, 100 O load, maximum gain)
24 Vdc power supply current: 40 mA (idle), 65 mA (max.)
Case dimensions: 5.75” (14.6 cm)W x 3” (7.6 cm)D
Mounting size: 1/3 rack width.

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Package Specifications & Dimensions
Weight:0.97 lbs.
RoHS Comp:Yes
Warranty:365 days
Need to Return?
Length:10.5 in.
Width:7.25 in.
Height:2.5 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No
Catalog Pages
PDF Reference

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Mfr. Info

Radio Design Labs Logo
Mfr. Name:Radio Design Labs
Mfr. Part Number:EZ-HDA4B