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35 Watt Remote Mixer Amplifier - 4/8 Ohm Outputs



The HD-RA35U 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. A paging source is normally connected to Input 1. The Zone 1 amplifier output level for inputs 2, 3 and 4 is VCA controlled using various optional RDL remote controls. This allows the user controls to be conveniently wall mounted without running audio to and from the remote control location. The Zone 1 output drives 4 ohm or 8 ohm speakers. The output impedance is switch-selectable on the rear panel. The Zone 2 amplifier output drives an 8 ohm speaker and/or 600 ohm telephone equipment.

The HD-RA35U is engineered, tested and manufactured in the U.S.A. to strict energy conservation standards. The unit consumes less than 1W 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-RA35U features two mixers. The Zone 1 mixer is split between the front-panel (Paging Input 1 and tone controls) and a remote control (Inputs 2, 3 and 4) providing user level 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.

Main Features:
• Four audio inputs
• Paging input with front-panel volume control
• Three inputs with VCA volume control adjusted using RDL remote control
• Bass and Treble tone controls
• Designed for background music with paging and music-on-hold
• 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 Zones (2): Zone 1 (Main): 35 W RMS, remote-controlled mixer (3 user controls) with paging input level control on front panel; 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 61938: 2013), 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 Release Delay: Rear-panel single-turn trimmer, adjustable 2 to 6 seconds
• 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 panel and rear trimmer at max.)
 • 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): ±1 dB (50 Hz to 20 kHz)
• Tone Controls: ±10 dB @ 10 kHz, ±9 dB @ 100 Hz (front-panel) with center detent
• Audio Outputs (2): -10 dBV nominal (316 mV), dual mono unbalanced RCA (main mixer; FLAT or EQUALIZED, switch-selectable on rear panel); 0 dBu nominal balanced, terminal block (zone 2 mixer)
• MOH Output: 0 dBu nominal (775 mV), 600 Ohm transformer-isolated, 16 dB headroom
• Power Amplifier Outputs (2): Zone 1 (main, <1% THD+N): 35 W RMS (4 Ohms), 32 W (8 Ohms) on detachable terminal block (switch-selectable 4 or 8 Ohm impedance); 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 (3): Zone 1 (main) inputs 2, 3 and 4, 0 to 10 Vdc control, RJ45 (compatible with RDL VCA wall controls)
• Front-panel controls (4): Zone 1 (main) paging level control (input 1), 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), Tone control paging bypass (includes or excludes input 1 from tone controls), Zone 2 mixer level controls (4, inputs 1 through 4)
• Efficiency Standard: “Energy Star® Program Requirements for Audio/Video” Version 2.0, applicable for passive remote control models (without muting)
• 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
• 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: 10 in.(25.4 cm); Weight: 5.6 lb.(2.5 kg)
• Package Type: Cardboard Box
• Package Dimensions: 17.75 x 9.125 x 3.9375 in.
• Shipping Weight: 8.095 lbs.
• WEEE weight: 6.36 lbs.
• Tariff code: 8518.50.0000

List Price: $544.41
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