The RDL HD-MA35 Mixer Amplifier with Power Supply 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 kΩ controls. This output drives 4 Ω or 8 Ω speakers. The output impedance is switch-selectable on the rear panel. The Zone 2 amplifier output drives an 8 Ω speaker and/or 600 Ω telephone equipment. The HD-MA35A has all the features of the HD-MA35 except its 35 W (Zone 1) amplifier provides a constant voltage output (25 V, 70 V or 100 V) instead of a low impedance speaker output. The HD-MA35 is engineered and manufactured in the U.S.A.
The HD-MA35 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 Ω speaker. The Zone 2 section includes a 2 W amplifier and a 600 Ω transformer-balanced MOH output.
The HD-MA35 has three inputs that are common to both mixers. Input 1 accepts a balanced mic or line level source. Inputs 2 and 3 accept unbalanced mono or stereo line-level sources.
| Amplifier Zones (2) | Zone 1 (Main): 35 W RMS, front-panel mixer (user controls) |
|---|---|
| Amplifier Zones (2) | Zone 2: 2 W RMS (8 Ohms), rear-panel mixer (trimmers) |
| Audio Inputs (3) | Balanced, mic or line switch selectable on terminal block |
| Audio Inputs (3) | 2, unbalanced stereo summing inputs on RCA jacks |
| Maximum Input Level | Mic Input: -11.5 dBu; Balanced line input: + 19 dBu; |
| Maximum Input Level | 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 |
| 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 | Mic Input: -50 dBu (2.5 mV), (front panel gain at max.) |
| Input level | Balanced line input: -21 dBu (70 mV), (front panel gain at max.) |
| Input level | 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); |
| Noise (line output) | Unbalanced Inputs: |
| Noise (amplified outputs) | Mic input: -68 dB, Balanced line input: -72 dB (below compressor threshold at max gain); |
| Noise (amplified outputs) | Unbalanced Inputs: |
| 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 to line output: ±1 dB (20 Hz to 20 kHz) |
| Frequency Response (mixer) | Unbalanced line input to line output: ±0.5 dB (20 Hz to 20 kHz) |
| Frequency Response (Zone 1 amplifier) | ±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) |
| Audio Outputs (2) | 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, |
| Power Amplifier Outputs (2) | 32 W (8 Ohms) on detachable terminal block (switch-selectable 4 or 8 Ohm impedance) |
| Power Amplifier Outputs (2) | Zone 2: 2 W (8 Ohms, on detachable terminal block) |
| Indicators (6) | Front-panel: Signal present (3; 1 per input, green) |
| Indicators (6) | Compressor activity (red), Power (bright=on, dim=standby, blue) |
| Indicators (6) | Rear-panel: Ducking/muting threshold (yellow) |
| VCA | Zone 1 (main) master level, 0 to 10 Vdc control, detachable terminal block |
| Front-panel controls (6) | Zone 1 (main) mixer level controls (3, inputs 1 through 3) |
| Front-panel controls (6) | EQ (2, bass and treble), Power (latching pushbutton, on/standby) |
| 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 (H x W x D) | 3.5" (88.9 mm) x 8.5" (216 mm) x 6.75 in (171 mm) |
| Package Type | Cardboard Box |
| Package Dimensions | 10.75" (273.05 mm) x 9.125" (231.775 mm) x 3.9375" (100.0125 mm) |
| Shipping Weight | 5.08 lbs (2.304 kg) |
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
