The HD-MA35UA is a four input audio mixer amplifier for systems demanding the broadest range of features and the highest energy efficiency. Two output power amplifier zones, 35 watts (Zone 1) and 4 watts (Zone 2), are driven from high-efficiency Class D amplifier stages. The mixer and amplifier sections all normally shut down (standby "sleep" mode) when audio is absent and automatically turn on when needed. The Zone 1 amplifier output level may be VCA controlled using various optional RDL remote controls, or by industry standard 0 to 10 Vdc or 0 to 10k ohm controls. This output provides a constant voltage output (25 V, 70 V or 100 V). The Zone 2 amplifier output drives an 8 ohm speaker and/or 600 ohm telephone equipment. The HD-MA35UA is engineered, tested and manufactured in the U.S.A. to strict energy conservation standards. The unit consumes less than 1 watt of mains power in standby mode, and meets power amplifier efficiency specifications with analog-filtered Class-D digital output stages for both power amplifier output zones and for the 600 ohm output. The HD-MA35UA features two mixers. The Zone 1 mixer is located on the front-panel providing user level and tone controls for the 35 watt amplifier output. The tone controls adjust the equalization at the Zone 1 amplifier output and can be switch selected on the rear panel to also adjust the equalization at the line-level output. The Zone 2 mixer on the rear panel provides level trimmers normally set by the installer to provide music-on-hold and/or for background music in a small zone equipped with an 8 ohm speaker. The Zone 2 section includes a 4 watt amplifier, a 600 ohm transformer-balanced MOH output, and an active balanced line-level output that may be used to feed another audio power amplifier. The HD-MA35UA has four inputs that are common to both mixers. Inputs 1 and 2 accept balanced mic or line level sources. Inputs 3 and 4 accept unbalanced mono or stereo line-level sources.
Four inputs with individual front-panel volume controls
Bass and Treble tone controls
Designed for background music with paging and music-on-hold
Master volume VCA controlled with remote adjustment capability
Manual or automatic (VOX) priority ducking
Balanced inputs and amplified outputs on detachable terminal blocks
Unbalanced inputs and outputs on RCA jacks
Includes power supply
Automatic sleep mode meets strictest energy saving standards
Amplifier Signal Type - Audio
Amplifier Type - Power Amplifier
Spec Sheet available - Yes
Amplifier Zones (2)::
Zone 1 (Main): 35 W RMS, front-panel mixer (user controls); Zone 2: 4 W RMS (8 Ohms), rear-panel mixer (trimmers)
Audio Inputs (5)::
2, balanced, mic or line switch selectable on terminal blocks; 2, unbalanced stereo summing inputs on RCA jacks; 1, unbalanced amp in on RCA jack
Gain Adjustments (2)::
Inputs 1 and 2: Rear-panel single-turn trimmer
Maximum Input Level::
Mic Inputs: -9 dBu; Balanced line inputs: + 20 dBu; Unbalanced Inputs: + 5 dBV (+11 dBV, one input); (for 1% THD+N at output)
Phantom Voltage::
24 Vdc (IEC 1938: 1996-12), switch-selectable for each mic input
Ducking/Muting Actuation::
Automatic (Input 1 VOX: rear-panel adjustable signal threshold with LED indicator) or Manual (contact closure to ground)
Ducking/Muting::
Switch-selectable for inputs 2, 3 and/or 4, 25 dB ducking attenuation, nominal
Effects Loop::
Unbalanced RCA jacks (preamp output from main mixer, input to power amplifier)
External RDL Module Power Output::
24 Vdc, 100 mA maximum, ground-referenced
Input level (to cross compressor threshold equaling 23 W amplified output)::
Mic Inputs: -50 dBu (2.5 mV), (front panel and rear trimmer at max.) Balanced line inputs: -21 dBu (70 mV), (front pane Unbalanced Inputs: -15 dBV (180 mV), (front panel and rear trimmer at max., both inputs driven)
Noise (line or amplified outputs)::
Mic or Balanced line inputs: -70 dB (below compressor threshold at max gain); Unbalanced Inputs: <-75 dB (max gain)
THD+N::
< 0.5% (1 kHz at compressor threshold, main amp output); < 0.1% (line output, main)
CMRR::
Mic inputs: > 50 dB (50 Hz to 120 Hz); Balanced line inputs: > 80 dB (50 Hz to 120 Hz, transformer-coupled input)
Compressor::
Threshold 2 dB below rated output, automatically adjusting attack and release times
Frequency Response (mixer)::
Mic to line output: ±1.5 dB (40 Hz to 25 kHz); Balanced line input to line output: ±1 dB (20 Hz to 20 kHz); Unbalanced line input to line output: ±0.5 dB (20 Hz to 20 kHz)
Frequency Response (amplifiers)::
Constant voltage: ±3 dB (50 Hz to 18 kHz); 4/8 Ohm: ±1 dB (50 Hz to 20 kHz)
Tone Controls::
±10 dB @ 10 kHz, ±9 dB @ 100 Hz (front-panel) with center detent
Power Amplifier Outputs (2)::
Zone 1 (main): 35 W RMS (25, 70 or 100 V); Zone 2: 4 W (8 Ohms, on detachable terminal block)
Indicators (9)::
Front-panel: Signal present (4; 1 per input, green), Compressor activity (red), Power (bright=on, dim=standby, blue); Rear-panel: dual-LED VU meter (for inputs 1 and 2, green/red), Ducking/muting threshold (yellow)
VCA::
Zone 1 (main) master level (with switch-selectable input 1 bypass), 0 to 10 Vdc control, RJ45 (compatible with RDL VCA wall controls)
Front-panel controls (7)::
Zone 1 (main) mixer level controls (4, inputs 1 through 4), EQ (2, bass and treble), Power (momentary pushbutton, toggle on/standby)
Rear-panel controls (22)::
Gain trimmers (2, input 1 and 2), Mic/Line switch (2, input 1 and 2), Zone 1 line output pre/post-EQ switch, Effects loop bypass switch, Sleep (standby) mode delay (4 binary switches), Input 1 ducking/muting detector sensitivity trimmer, Phantom voltage switches (2, input 1 and 2), Ducking control switches (3, to duck inputs 2, 3, and/or 4), VCA paging bypass (includes or excludes input 1 from master VCA control) Zone 2 mixer level controls (4, inputs 1 through 4 Efficiency Standard:
Sleep Mode Power Consumption::
< 1 W (amplifier and included power supply)
Sleep Mode Delay::
10 minutes to 2 hours (switch-selectable in 10 minute increments)
Sleep Mode Disable::
Selectable
Active Mode Delay::
2 seconds (nominal) after input audio detected
Audio Detector Threshold::
-80 dBu mic (at max input gain), -55 dBu balanced line (at max input gain), -42 dBV unbalanced
Power Supply (included)::
100 to 240 Vac, 50-60 Hz, 50 W; 24 Vdc output to amplifier chassis
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