b - GBS
Multiple Stereo/Mono Headphone Amplifiers
HDA400
HDA600
The HDA400 is an economical four output stereo monitoring system. Balanced 1/4" 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.
Model HDA400
Mono/Stereo Switch
Direct Input/Output Level Controls
Signal Present Indicators
Input Program & Cue Clipping
Indicators
Mono Cue Input
Internal Power Supply
Model HDA600
Multiple Stereo/Mono Headphone Amplifiers
Technical Specifications
OUTPUTS
LEVEL
DISTORTION
RESPONSE
SEPARATION
NOISE
GAIN
INPUTS
MASTER LINE
CUE*
DIRECT*
INDICATORS
INPUT CLIP
CUE CLIP*
SIGNALPRESENT*
POWER
CONNECTIONS
INPUT
OUTPUT
POWER IN
SIZE
WEIGHT
POWER
REQUIREMENTS
WARRANTY
*Model HDA600 only
HDA400
HDA600
Four (HDA400) or Six (HDA600) high compliance 6V/80mA outputs
Capable of 100mW minimum into 32 to 600 ohm headphones
.10% THD maximum 20 – 20,000 Hz, below clipping
+0/-.5dB 20 – 20,000 Hz
70dB minimum at 1kHz
-90dB E.I.N. 20 – 20,000 Hz
All models: Program inputs 26dB maximum
HDA600 only: Cue input 65dB maximum; Direct Inputs 10dB maximum
Balanced 20k bridging; Nominal -10/+4 selectable, maximum +24dBu input
Balanced 20k bridging; Nominal line level at -10dBu or Mic level at -50dBu
Unbalanced 20k TRS Stereo at -10dBu nominal
Balanced 20k bridging Mono at -10dBu with internal jumper change
Yellow – Lights at onset of input stage clipping
Yellow – Lights at onset of input stage clipping
Green – Lights at –20dBu buss or direct inputs
Red
Program Inputs and Cue* Input: Balanced XLR* and Balanced TRS
Direct Channel Inputs: Unbalanced Stereo or Balanced Mono TRS
Unbalanced TRS
Standard IEC 320 3 Pin
1RU package; 19" (48.3cm) W x 1-3/4" (4.5cm) H x 7.5"(19.1cm) D
5 lbs (2.3kg)
115 VAC nominal, 105 to 125 VAC, 50-60Hz, 24VA max
230 VAC nominal, 220 to 240 VAC, 50 – 60Hz, 24VA max (specify)
Limited, One Year Warranty
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