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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-HDMA35A
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Product Name
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Mixer
Amplifier 35 Watt with Power Supply, Constant Voltage Output 25 70
or 100 V |
| UPC Code |
813721010773
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Overview
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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 USA. 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
The HD-MA35A 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-MA35A, 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-MA35A 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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Constant
voltage: More or less 3 dB (50 Hz to 18 kHz); 4/8 Ohm: 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): 35 W RMS (25, 70 or 100 V); 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 |
6.0 lbs
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| Shipping Weight |
7.1 lbs |
