RDL HD-MA35A 4-Input 35-Watt Mixer/Amplifier, 25V, 70V, 100V Outputs

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HD-MA35A
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The HD-MA35A is a three input audio mixer amplifier for systems demanding a broad range of features and high energy efficiency. Two output power amplifier zones are provided, 35 W (Zone 1) and 2 W (Zone 2). The Zone 1 output is driven from a high-efficiency Class D amplifier stage. 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 10 kOhm controls. This output provides a constant voltage (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-MA35A is engineered and manufactured in the U.S.A.

The HD-MA35A features two mixers. The Zone 1 mixer is located on the front-panel providing user level and tone controls for the 35 W amplifier output. The tone controls adjust the equalization at the Zone 1 amplifier 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 2 W amplifier and a 600 Ohm transformer-balanced MOH output.

  • Three 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
  • High-efficiency Class D operation
  • Amplifier Zones (2):Zone 1 (Main): 35 W RMS, front-panel mixer (user controls); Zone 2: 2 W RMS (8 Ohms), rear-panel mixer (trimmers)
  • Audio Inputs (3):Balanced, mic or line switch selectable on terminal block; 2, unbalanced stereo summing inputs on RCA jacks
  • Maximum Input Level:Mic Input: -11.5 dBu; Balanced line input: + 19 dBu; Unbalanced Inputs: + 9 dBV (+15.5 dBV, one input); (for 1% THD+N at output)
  • Phantom Voltage:24 Vdc (IEC 61938: 2013), switch-selectable for the 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 Release Delay:4 seconds, nominal
  • Ducking/Muting:Switch-selectable for inputs 2 and/or 3, 25 dB ducking attenuation, nominal
  • External RDL Module Power Output:24 Vdc, 100 mA maximum, ground-referenced
  • Input level:(to cross compressor threshold equaling 23 W amplified output)
  • Mic Input: -50 dBu (2.5 mV), (front panel gain at max.)
  • Balanced line input: -21 dBu (70 mV), (front panel gain at max.)
  • Unbalanced Inputs: -15 dBV (180 mV, front panel gain at max., both inputs driven)
  • Noise (line output):Mic input: -68 dB, Balanced line input: -72 dB (below compressor threshold at max gain);
  • Unbalanced Inputs: <-85 dB (max gain)
  • Noise (amplified outputs):Mic input: -68 dB, Balanced line input: -72 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); < 0.25% (line output, main)
  • CMRR: Mic input:> 50 dB (50 Hz to 120 Hz); Balanced line input: > 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 (Zone 1 amplifier):Constant voltage: +/-3 dB (50 Hz to 18 kHz); 4/8 Ohm: +/-1 dB (50 Hz to 20 kHz)
  • Frequency Response (Zone 2 amplifier):8 Ohm: +/-1.5 dB (50 Hz to 20 kHz); 600 Ohm: +/-1.5 dB (30 Hz to 18 kHz)
  • Tone Controls:+/-10 dB @ 10 kHz, +/-9 dB @ 100 Hz (front-panel) with center detent
  • Audio Outputs (2):+4 dBu nominal (1.23 V), balanced, terminal block (FLAT); 0 dBu nominal balanced, terminal block (zone 2 mixer, 600 Ohm output)
  • MOH Output:0 dBu nominal (775 mV), 600 Ohm transformer-isolated, >16 dB headroom
  • Power Amplifier Outputs (2):Zone 1 (main): 35 W RMS (25, 70 or 100 V); Zone 2: 2 W (8 Ohms, on detachable terminal block)
  • Indicators (6):Front-panel: Signal present (3; 1 per input, green), Compressor activity (red), Power (bright=on, dim=standby, blue); Rear-panel: Ducking/muting threshold (yellow)
  • VCA:Zone 1 (main) master level, 0 to 10 Vdc control, detachable terminal block (compatible with RDL VCA wall controls)
  • Front-panel controls (6):Zone 1 (main) mixer level controls (3, inputs 1 through 3), EQ (2, bass and treble), Power (latching pushbutton, on/standby)
  • Rear-panel controls (9):Mic/Line switch (Input 1), Input 1 ducking/muting detector sensitivity trimmer, Phantom voltage switch (Input 1), Ducking control switches (2, to duck inputs 2 and/or 3), Zone 2 mixer level controls (3, inputs 1 through 3), HD-MA35: Output impedance switch 4 or 8 Ohms
  • Ambient Operating Environment:0° C to 50° C Maximum; 20° C Recommended
  • Power Supply (included):100 to 240 Vac, 50-60 Hz, 50 W; 24 Vdc output to amplifier chassis
  • Dimensions and Weight:Height: 3.5 in.(8.89 cm); Width: 8.5 in.(21.6 cm); Depth: 6.75 in.(17.1 cm); Weight: 6 lb.(2.7 kg)
  • Package Type:Cardboard Box
  • Package Dimensions:10.75 x 9.125 x 3.9375 in.
  • Shipping Weight:7.095 lbs.
  • WEEE weight:5.975 lbs.
  • Tariff code:8518.50.0000

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