Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www.
audio.com
Use only TRS output plugs and stereo headphones. The use of TS plugs on
mono headphones shorts one headphone output to ground. Although this will not
damage the HDA400, it will load down the power supply and reduce maximum
output levels to the other output channels. Output TRS plugs should all be wired
left to TIP, Right to RING and common to SHIELD.
CAUTION
The HDA400 provides a comfortable listening level of 1mW at around 12 o’clock
on the volume control for most headsets. The HDA400 is capable of driving many
headsets to DANGEROUS LEVELS over 120dB SPL. If you can hear distortion,
it’s TOO LOUD! Levels near 120dB SPL can easily cause PERMANENT
HEARING DAMAGE, BE CAREFUL! Treat your ears with tender loving care and
they will follow you anywhere.
PERFORMANCE SPECIFICATIONS
OUTPUTS:
Four high compliance 6V/80mA stereo drivers capable of
over 100mW into 32 to 600 ohm stereo headphones
DYNAMIC RANGE:
110dB Typical at output into 600-ohm headphones
DISTORTION:
.10% THD maximum, 20-20000 Hz, below clipping
RESPONSE:
+0/-.5dB, 20-20000 Hz
GAIN:
26dB maximum
NOISE:
-90dBu E.I.N., 20 – 20000 Hz
SEPARATION:
70dB minimum at 1kHz
INPUTS:
Stereo, 20K balanced, bridging, -10/+4dBu nominal
INDICATORS:
INPUT CLIP - onset of input stage clipping, Yellow LED
POWER – monitors internal DC voltage - Red LED
POWER:
115/230VAC, 50/60Hz, 24VA, and IEC320 3 pin connector
SIZE:
1RU package; 19” (48.3cm) W x 1 ¾” (4.5cm) H x 7.5”
(19.05cm) D 15lbs (6Kg)