Audio Technologies HDA600-RST-01 User Manual
Multiple Stereo/Mono Headphone Amplifiers
HDA400 HDA600
The HDA400 is an economical four output stereo monitoring system. Balanced ¼" TRS stereo
line inputs with a master level control, clipping indicator and stereo/mono switch drive four
independently adjustable high compliance stereo outputs. Each output comfortably drives
typical 32 to 600 ohm headphones to SPL in excess of 120dB at 100mW each. Headphone
output jacks are duplicated on front and rear panels. One rack space package with internal AC
power supply. CE marking.
The HDA600 is a full featured, six output stereo headphone distribution system. Parallel
balanced XLR and TRS cue and stereo line inputs allow easy loop-thru and connector
flexibility. A mic/line cue input is adjustable and selectable into left, right or both internal
distribution busses mixed with the stereo line feed. Clip LEDs monitor cue and line inputs. Six
independent, 100mW, high compliance stereo headphone drivers are fed from either the
internal distribution busses or from individual rear TRS connectors configurable as stereo
unbalanced or mono balanced inputs. Signal presence LEDs monitor each input. Headphone
outputs are duplicated on front and rear of the one rack unit, internally powered package. CE
marked.
These headphone amplifiers provide complete monitoring solutions for on-air studios, line
remotes, houses of worship, production rooms, learning centers, home studios, or state-of-theart recording studios.
• Mono/Stereo Switch
• Direct Input/Output Level Controls
• Signal Present Indicators
• Input Program & Cue Clipping
Indicators
• Mono Cue Input
• Internal Power Supply
Multiple Stereo/Mono Headphone Amplifiers
Technical Specifications
OUTPUTS
LEVEL Four (HDA400) or Six (HDA600) high compliance 6V/80mA outputs
DISTORTION .1A% THD maximum 20~ 20000 Hz, below clipping
RESPONSE +0/-.5dB 20~ 20000 Hz
SEPARATION 70dB minimum at 1kHz
NOISE -90dB E.I.N. 20~ 20000 Hz
GAIN Program inputs 30dB maximum; Cue* input 70dB maximum; Direct
INPUTS
MASTER LINE Balanced 20K bridging; Nominal –10/+4 selectable, maximum +24dBu
CUE Balanced 20K bridging; Nominal Line Level at –10dBu or Mic level at –
DIRECT Unbalanced 20K Ohm TRS Stereo at -10dBu nominal. Balanced 20K
INDICATORS
INPUT CLIP Yellow – Lights at onset of input stage clipping
CUE CLIP Yellow – Lights at onset of input stage clipping
SIGNAL PRESENT Green – Lights at –20dBu buss or direct inputs
POWER Red
CONNECTIONS
INPUT Program Inputs and Cue* Input: Balanced XLR* and Balanced TRS
OUTPUT Unbalanced TRS
POWER IN Standard IEC 320 3 Pin
SIZE
POWER
REQUIREMENTS
WARRANTY
Capable of 100mW minimum into 32 to 600 ohm headphones.
Inputs 16dB maximum
in.
50dBu.
bridging
Mono at -10dBu with internal jumper change.
Direct Channel Inputs: Unbalanced Stereo or Balanced Mono TRS
1RU package; 19" (48.3cm)W x 1-3/4"(4.5cm)H x 7.5"(19.05cm)D; 15
lbs(6Kg)
115 VAC nominal, 105 to 125 VAC, 50-60Hz, 24VA max
230 VAC nominal, 220 to 240 VAC, 50 – 60Hz, 24VA max
Limited, One Year Warranty
HDA400 HDA600
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