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General Information
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Manufacturer
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RDL
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Manufacturer Part Number
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RDL-HDMA35
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Product Name
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Mixer
Amplifier 35 Watt with Power Supply, Low Impedance Output 4 Ohm or
8 Ohm |
| UPC Code |
813721010766
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Overview
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The HD-MA35 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 kOhms controls. This
output drives 4 Ohms or 8 Ohms speakers
The output impedance is switch selectable on the rear panel. The
Zone 2 amplifier output drives an 8 Ohms speaker and or 600 Ohms
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 USA. 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 Ohms speaker.
The Zone 2 section includes a 2 W amplifier and a 600 Ohms
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. A balanced
line level output is provided on a detachable terminal block to
feed the inputs of other audio equipment or power amplifiers
Ground referenced 24 Vdc power is available on a rear panel
terminal block to power an optional external RDL module which may
be mounted on the panel space provided. External module type
examples: audio filtering or processing, mixing, isolation,
twisted pair sender and receiver.
The Zone 1 amplifier includes an analog compressor and limiter for
audio fidelity noticeably superior to conventional class D
amplifiers with digital limiting. Increasing the input gain can
substantially increase the average output power beyond that of a
standard 35 W amplifier
A red front panel LED flashes when the compressor is preventing
output clipping. Normal audio level signals remain unaffected by
the compressor thereby preserving audio dynamics
The audio is compressed according to three dynamic time constants
providing aural transparency while maintaining clean, unclipped
amplified audio for input overloads of up to 20 dB. The HD-MA35,
with compression, is capable of producing average audio output
levels and clarity normally expected from amplifiers with a much
higher output power rating
A blue POWER LED illuminates when the HD-MA35 is powered from its
external 24 Vdc power supply (included). The power LED is dim when
the mixer amplifier is in the standby mode, and is bright when the
amplifiers are fully active. A front-panel pushbutton is provided
to manually switch between standby and active modes
The power amplifiers are equipped with both thermal and output
short circuit protection. The high efficiency Class D output stage
produces minimal heat for all levels of expected voice or music
modulation
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Features
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- 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
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Specifications
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Amplifier
Zones (2)
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Zone
1 (Main): 35 W RMS, front-panel mixer (user controls); Zone 2: 2 W
RMS (8 Ohms), rear-panel mixer (trimmers)
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Audio
Inputs (3)
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Balanced,
mic or line switch selectable on terminal blocks; 2, unbalanced
stereo summing inputs on RCA jacks
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Maximum
Input Level
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Mic
Inputs: -11.5 dBu; Balanced line inputs: + 19 dBu; Unbalanced
Inputs: + 9 dBV (+15.5 dBV, one input); (for 1 percent THD+N at
output)
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Phantom
Voltage
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24
Vdc (IEC 61938: 2013), switch-selectable for the mic input
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Ducking/Muting
Actuation
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Automatic
(Input 1 VOX: rear-panel adjustable signal threshold with LED
indicator) or Manual (contact closure to ground)
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Ducking/Muting
Release Delay
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4
seconds, nominal
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Ducking/Muting
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Switch-selectable
for inputs 2 and/or 3, 25 dB ducking attenuation, nominal
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External
RDL Module Power Output
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24
Vdc, 100 mA maximum, ground-referenced
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Input
level (to cross compressor threshold equaling 23 W amplified
output)
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Mic
Inputs: -50 dBu (2.5 mV), (front panel gain at maximum)
Balanced line inputs: -21 dBu (70 mV), (front panel gain at
maximum)
Unbalanced Inputs: -15 dBV (180 mV), (front panel gain at maximum,
both inputs driven)
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Noise
(line output)
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Mic
input: -68 dB, Balanced line input: -72 dB (below compressor
threshold at maximum gain);
Unbalanced Inputs: Less than -85 dB (maximum gain)
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Noise
(amplified output)
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Mic
input: -68 dB, Balanced line input: -72 dB (below compressor
threshold at maximum gain);
Unbalanced Inputs: Less than -75 dB (maximum gain)
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THD+N
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Less
than 0.5 percent (1 kHz at compressor threshold, main amp output);
Less than 0.25 percent (line output, main)
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CMRR
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Mic
inputs: Greater than 50 dB (50 Hz to 120 Hz); Balanced line
inputs: Greater than 80 dB (50 Hz to 120 Hz, transformer-coupled
input)
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Compressor
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Threshold
2 dB below rated output, automatically adjusting attack and
release times
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Frequency
Response (mixer)
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Mic
to line output: More or less 1.5 dB (40 Hz to 25 kHz); Balanced
line input to line output: More or less 1 dB (20 Hz to 20 kHz);
Unbalanced line input to line output: More or less 0.5 dB (20 Hz
to 20 kHz)
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Frequency
Response (Zone 1 amplifiers)
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More
or less 1 dB (50 Hz to 20 kHz)
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Frequency
Response (Zone 2 amplifiers)
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8
Ohm: More or less 1.5 dB (50 Hz to 20 kHz); 600 Ohm: More or less
1.5 dB (30 Hz to 18 kHz)
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Tone
Controls
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More
or less 10 dB at 10 kHz, More or less 9 dB at 100 Hz (front-panel)
with center detent
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Audio
Outputs (2)
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4 dBV
nominal (1.23 V), balanced, terminal block (FLAT); 0 dBu nominal
balanced, terminal block (zone 2 mixer, 600 Ohm output)
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MOH
Output
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0 dBu
nominal (775 mV), 600 Ohm transformer-isolated, 16 dB headroom
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Power
Amplifier Outputs (2)
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Zone
1 (main, less than 1 percent THD+N): 35 W RMS (4 Ohms), 32 W (8
Ohms) on detachable terminal block (switch-selectable 4 or 8 Ohm
impedance); Zone 2: 2 W (8 Ohms, on detachable terminal block)
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Indicators
(6)
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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)
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VCA
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Zone
1 (main) master level, 0 to 10 Vdc control, detachable terminal
block (compatible with RDL VCA wall controls)
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Front-panel
controls (6)
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Zone
1 (main) mixer level controls (3, inputs 1 through 3), EQ (2, bass
and treble), Power (latching pushbutton, on/standby)
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| 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
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| Power Supply
(included) |
100 to 240 Vac, 50-60 Hz, 50 W; 24 Vdc output to
amplifier chassis
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| Ambient Operating Environment |
0C to 50C Maximum; 20C Recommended
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| Dimensions |
3.50" x
8.50" x 6.75"
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| Shipping Dimensions |
10.75" x 9.13" x 3.94" |
| Weight |
3.98 lbs
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| Shipping Weight |
5.08 lbs |
