Audio Technologies Inc. HDA600
6-Channel Studio Headphone Amplifier


The HDA600 is a rugged, AC powered headphone amplifier that will provide excellent performance driving a wide range of typical stereo headphones. It will drive the usual 32 to 600 ohm high efficiency stereo headphones to teeth rattling levels near 120dB SPL with a combination of high output voltage swing (16Vp-p) for high impedance phones and a protected high current capability (.2Ap-p) for low impedance phones. It will do the above at distortion levels below .10% and response flat to .25db both measured over the full frequency range of 20Hz to 20kHz.

The HDA600 provides a stereo program input plus a mono cue input driving six stereo headphone output drivers. The HDA600 will bridge both balanced and unbalanced program input lines with individual left and right XLR and ¼ inch TRS input connectors. The spare connector set may be used to loop-through the input signal to additional HDAs. Inputs are electronically balanced but will operate properly when an unbalanced ¼ inch plug is inserted. An internal input stage gain selector plug (P2) optimizes the input stage gain for either -10dBu or +4dBu nominal inputs or the program INPUT CLIP indicator shows input overdrive. A MASTER LEVEL control and MONO/STEREO switch adjust the program signal fed to all output channels via an internal stereo distribution buss. The MONO/STEREO switch allows a quick check of the mono compatibility of a stereo mix and allows two separate mono signals, applied to the stereo inputs, to be easily summed for monitoring.


  • Mono/Stereo Switch
  • Direct Input/Output Level Controls
  • Signal Present Indicators
  • Input Program & Cue Clipping Indicators
  • Mono Cue Input
  • Internal Power Supply
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