Radio Design Labs EZ-HDA4A
1x4 Headphone Distribution Amplifier


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List Price: $202.98
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Radio Design Labs' EZ-HDA4A contains four stereo headphone amplifiers with individual front-panel volume controls. Headphone outputs are provided on front-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-HDA4A is used in music stores, houses of worship, studios, museums, home component systems and commercial sound systems. Power supply included.


  • 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 Front Panel
  • Outputs on MINI Jacks
  • Front-Panel LEVEL Control for Each Output


  • Inputs (3): Stereo on dual RCA jacks, stereo mini jackor 1/4” (6.3 mm) TRS, > 10 kO, -10 dBV nominal, +8.5 dBV max. (RCA and1/4”), -16 dBV nominal, +2 dBV max. (Mini)
  • 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)
  • Outputs (4): Stereo on Mini jacks (front panel), 60 mW(100 O load)
  • Frequency Response: 20 Hz to 50 kHz (±1.5 dB)
  • 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.)
  • Power supply input voltage: 100 to 240 VAC
  • Warranty: 3 Years; contact RDL technical supportdepartment for assistance
  • Case dimensions: 5.75” (14.6 cm)W x 3” (7.6 cm)D
  • Mounting size: 1/3 rack width
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Surface mount bezel for 1/3 rack width EZ products.

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Radio Design Labs' PS-24AS is a 24 Vdc switching power supply with a North American AC plug.  500 mA, dc plug.Specifications: Input: 100 to 240 VACOutput: 24 Vdc, 500 mA (UL, CSA)Dimensions: 1.65" x 2.75" x 1.45" (4.2 x 7 x 3.7 ...

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Under counter bracket pair for all EZ product widths

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Component Chasis, 6 x 1/6 RURadio Design Labs EZ-CC6 Component Chasis, 6 x 1/6 RU

Component Chassis for 6 Increments of 1/6 Rack WidthFeatures: Mounts All EZ A/V Products Mounts EZ Storage Drawers Cover Lifts Off for Easy Product Mounting Integral Heavy-Duty Non-Skid Rubber Feet

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Rack Adapter Radio Design Labs EZ-RA6 Rack Adapter

Rack Adapter for 6 Increments of 1/6 Rack Width Mounts All EZ A/V Products Mounts EZ Storage Drawers Base Plate Slides Out for Easy Product Mounting Occupies One RU in Standard 19¨ Rack

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Desktop Chassis 1/3 RackRadio Design Labs EZ-DC2 Desktop Chassis 1/3 Rack

Desktop Chassis for 1/3 Rack Width EZ Products Mounts 1/3 Width EZ Product to Desktop Installs Quickly With Two Screws Covers Cable Port in Desktop Provides Space for Excess Wire

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Filler Panel, 1/6RU Radio Design Labs EZ-FP1 Filler Panel, 1/6RU

Filler Panel - 1/6 Rack Width for EZ-RA6 or EZ-CC6.

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