The 904is a high performance power amplifier for balanced stereo audio signals. It will amplify a balanced stereo audio signal from a preamp and output 75 watts per channel delivered into a 4 ohm load.

Digital Class T Technology - Superb Sonic Quality.
Input - 1 pair of line level Balanced stereo on terminal blocks.
Outputs - 1 pair of stereo speakers on terminal blocks and 1 headphone jack.
S/N Ratio - 60 db.
Control - Volume, mute.
Multi-color LED stereo level indicators on the front panel.
Built-in Short Circuit Protection.
Worldwide Power Supply - 110-220V AC.
Standard 19” Rack Mount Size - 1RU.

Specifications

INPUTS:    1 balanced stereo on a 5-pin detachable terminal block.
OUTPUTS:    1 differential Stereo loudspeakers output on a terminal block;1 Headphone output.
MAX. OUTPUT LEVEL:    Speakers: 52Vpp on 4 Ω loads; Headphones: 8.4Vpp
BANDWIDTH:    >20 kHz.
S/N RATIO:    60dB
CONTROLS:    Speakers out: <0 to 30dB; Headphones: <-26 to 12dB (level for both) DC offset adjustment for speakers (internal trimmers).
COUPLING:    Input: AC; Speakers out: DC; Headphones out: AC
AUDIO THD + NOISE:    Speakers: 0.06%; Headphones: 0.05%
AUDIO 2nd HARMONIC:    Speakers: 0.04%; Headphones: 0.007%
OUTPUT POWER:    Up to 75 Watts RMS per channel
POWER SOURCE:    253VA, 230VAC
DIMENSIONS:    19 inch (W), 7 inch (D), 1U (H) rack mountable (with ear brackets)
WEIGHT:    2.8kg (6.2lbs.) approx.
ACCESSORIES:    Power cord, removable ear brackets and screws for attaching

 
Applications

Presentation rooms and multimedia applications for quick, local audio amplification.
Public address systems.