RDL HD-MA35U Users Manual

HD-MA35U

INSTALLATION AND OPERATION

INTRODUCTION

Congratulations on your selection of an RDL HD-Series Ultra-High-Efficiency commercial mixer amplifier. The HD-MA35U is part of the world’s first full-featured environmentally conscious
“green” mixer amplifier series for commercial installations. This product includes studio quality microphone input stages, line-level transformer isolation, equalization, remote control capability
and integral analog compression coupled to sonically pleasing analog-filtered high efficiency Class D output stages. An internal low-power-consumption processor monitors usage demands
to completely shut down internal circuitry for maximum power conservation and extremely low long-term operating cost. The HD-Series mixer amplifiers are designed and manufactured in the
U.S.A. using the most advanced automated manufacturing and testing processes for years of reliable high performance and cost savings.

CONNECTIONS

USE ONLY THE POWER SUPPLY
SUPPLIED WITH THE MODULE.

HD-MA35U 4Ω/8Ω

Connections are made on the rear panel. All connections are on detachable terminal blocks or connectors. The Zone 2 mixer, Inputs 1 and 2 gain trimmers and VU-meter, ducking controls and
assignments, phantom voltage selectors and sleep mode delay timer settings are also provided on the rear panel. The Zone 1 mixer, tone controls, indicators and power button are on the front panel.

INPUT WIRING

Balanced MIC or LINE source connected
using a single-pair shielded audio cable

Balanced LINE signal from phone
PBX or audio transformer

Unbalanced MIC or LINE source connected using
a single-conductor shielded audio cable

Four inputs may be connected. Each input is available on the primary Zone 1 front-panel mixer and on the Zone 2 rear-panel mixer. If used, the paging source is usually connected to Input 1.

INPUT 1 INPUT 2

INPUT 1 BYPASS MASTER VCA

If the INPUT 1 (paging) level is to be controlled by a master VCA remote control, set the switch OFF (down). If a remote control

not

intended to adjust INPUT 1, set the switch ON (up). In BYPASS, pages are heard even if the master is off.

is

PHANTOM VOLTAGE

If a condenser mic may be connected to INPUT 1, set the
phantom voltage ON (switch up).

GAIN TRIM

Feed a normal signal level into INPUT 1 and adjust the GAIN
TRIM for maximum brightness of the NORM green LED with
occasional flashing of the red PEAK LED. (Disconnect INPUT 2
during this adjustment.)

MIC or LINE Gain

Set the Input Gain to MIC or LINE/TEL according to the input
signal connected.

INPUT 1

Connect a MIC or LINE source. This is normally a paging mic or the line-level paging output from a phone PBX. The line-level
input is transformer balanced (providing galvanic isolation) and may be connected balanced or unbalanced.

INPUT 2

Connect a MIC or LINE source. The line-level input is
active balanced and may be connected balanced or
unbalanced.

PHANTOM VOLTAGE

If a condenser mic may be connected
to INPUT 2, set the phantom voltage
ON (switch up).

GAIN TRIM

Feed a normal signal level into
INPUT 2 and adjust the GAIN TRIM
for maximum brightness of the NORM
green LED with occasional flashing
of the red PEAK LED. (Disconnect
INPUT 1 during this adjustment.)

MIC or LINE Gain

Set the Input Gain to MIC or LINE
according to the input signal connected.

The front-end preamplifier stages for Inputs 1 and 2 are each equipped with a gain trimmer. The dual-LED VU meter displays the signal level for Inputs 1 and 2 following the preamplifiers. This
allows each input gain trimmer to be set properly for the optimum signal-to-noise ratio, avoiding the possibility of input clipping common to mixers with unmetered input stages.

PRIORITY PAGING

INPUTS 3 & 4

INPUT DUCKING SELECTOR

Select any or all inputs (2, 3 and/or 4) to be ducked when a paging priority is detected (VOX activated by audio signal on INPUT 1, or
MANUAL activation by an external switch. Selected inputs are ducked only in Zone 1 (the primary amplified output). Set the switch
ON (switch up) to duck the input in Zone 1; set the switch OFF to prevent ducking. Inputs are not ducked in Zone 2.

LEFT

VOX (VOICE-ACTIVATED PRIORITY)

If a paging signal is to automatically “duck” (fade down) other
audio inputs, feed a normal paging signal into INPUT 1 and adjust
the SENSITIVITY trimmer until the LED flashes regularly. Set the
SENSITIVITY trimmer fully CCW to disable the VOX function.

FADE-UP DELAY

Adjust the FADE-UP DELAY trimmer to delay the start of the
audio fade-up following the release of an external manual priority
switch and/or VOX priority detection.

MANUAL PRIORITY

If a swich (such as a paging mic push-to-talk switch) should “duck” (fade down) other audio inputs, connect the switch to the DUCK and Ground terminals.

STEREO SOURCE MONO SOURCE

RIGHT

INPUTS 3 & 4

Connect a mono or stereo standard unbalanced -10 dBV audio
source to INPUTs 3 and/or 4. The two input jacks associated with
each input provide active summing of the left and right channels,
thereby preserving the stereo separation of the audio source.

REMOTE CONTROL FOR ZONE 1 AMPLIFIER OUTPUT

MASTER VCA REMOTE CTRL

Connect this RJ45 jack directly to an RDL
remote control. (Examples: RLC10KM or
RLC10KMS) The RJ45 wiring may be
“broken out” for connection to external
OEM 0 to 10 Vdc control, RDL remote
controls (see RLC10K) or 10k Ohm pot.

EFFECTS LOOP

EFFECTS LOOP CONNECT SWITCH

This switch is normally left in the ON (up)
position when the effects loop is not used.
The switch connects the preamp output from
the Zone 1 mixer directly to the input of the
Zone power amp stage. Set this switch OFF
(down) to insert external processing.

ZONE 1 OUTPUT CONNECTIONS

IMPEDANCE SWITCH

Set to 8 Ohms (switch out)

IMPEDANCE SWITCH

Set to 4 Ohms (switch in)

PIN 7, +10 Vdc
PIN 1, VCA control
PIN 8, Ground Ref.

WIRING “Break-out”

IMPEDANCE SWITCH

Set to 4 Ohms (switch in)

PIN 1, VCA control
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6

RJ45 Control Wiring

External 0 to 10 V Control

Pin 1 0 to 10 V

PIN 7, +10 Vdc
PIN 8, Ground Ref.

External 10k Ohm Pot.

CW

Pin 8 Ground Reference

CCW

MODULE POWER

24 Vdc, 100 mA is available to power external modules.

MODULE MOUNTING AREA

This area is reserved for mounting RDL STICK-ON
or TX-Series modules. This example shows a
high-pass filter to protect horn loudspeakers from
bass overload. Other effects possibilities include
equalizers, mixers, crossovers or processors.

IMPEDANCE SWITCH

Set to 8 Ohms (switch out)

PIN 7, +10 Vdc

PIN 1, VCA control

PIN 8, Ground Ref.

Two 4 Ohm

Single 8 Ohm speaker Single 4 Ohm speakerTwo 8 Ohm speakers

ZONE 2

LINE OUTPUT

Active balanced

INPUTS

Adjust for desired
output level

Balanced LINE signal feeds phone PBX

The Zone 2 mixer operates from the same 4 inputs as the front-panel Zone 1 mixer. Ducking assignments do not affect the signals in Zone 2. Each input source should be adjusted to the
desired output level. Turn down unused inputs to remove them from the mix. Three Zone 2 outputs are provided. The LINE OUTPUT is balanced and may be used to feed the input of an other
power amplifier. The 600 Ohm output is transformer isolated (providing galvanic isolation) to drive a phone PBX paging input. The 8 Ohm output drives an 8 Ohm speaker with up to 4 W RMS.

AUTOMATIC SLEEP MODE

speakers

Connect an 8 Ohm speaker or multiple
speakers configured to present an 8 Ohm
load to the amplifier.

10 Minutes 40 Minutes 70 Minutes 100 Minutes

20 Minutes 50 Minutes 80 Minutes 110 Minutes

Disable (mixer-amplifier remains
ON, does not enter standy mode)

30 Minutes 60 Minutes 90 Minutes 120 Minutes

Upon loss of audio at all inputs, a timer starts. At the completion of the timing interval, the mixer amplifier enters the standby mode. All circuits not needed to detect audio presence are shut
off. When audio is detected, all circuits turn on and wait for a loss of audio to restart the timing interval. The timer may be disabled if required by system specifications.

ADDING ZONES OPERATION

TONE CONTROLS

EQUALIZATION

Set the switch to
EQUALIZED (in) if the
front-panel tone controls
should affect the line
output; Set to FLAT (out)
if the tone controls should
not affect the line output.

ADDITIONAL ZONE AMPLIFIERS

Connect the LINE OUTPUT to the line input of one or
multiple additional RDL amplifiers to permit the Zone
1 mixer to feed other zones. The LINE OUTPUT is not
controlled by the master VCA remote control so each
additional zone may have its own master level control.
The LINE OUTPUT may be set to provide “flat” audio or
to allow equalization by the front-panel tone controls.
The LINE OUTPUT may also be used to feed recording
equipment or an audio distribution amplifier.

RDL• 659 6th Street • Prescott, AZ • USA 86301 • Sales: 800-281-2683 • 928-443-9391 • Tech Support: 800-933-1780 • 928-778-3554 • RDL Europe Sales & Support: (31) 20-6238-983 • www.rdlnet.com

891-3335A

Copyright © 2011 Radio Design Labs, Inc. RDL, Radio Design Labs and the RDL logo are registered trademarks of Radio Design Labs, Inc. Data reflects product at publication time, subject to change without notice. “Made in USA” applies to all HD products except power supplies. Other trademarks, if any, are the property of their respective owners.

SIGNAL PRESENT 1 - 4

MIXER LEVEL 1 - 4

Adjust each level control for the desired output level. If a master remote control is connected, it will adjust the final
mixer output level. (Note: If the INPUT 1 VCA Bypass is enabled (See INPUT 1 Settings), a connected remote control
will NOT adjust the paging signal on INPUT 1. It will be controlled only by the front panel INPUT 1 level control.)

The green LED glows when audio is present at the input. The indication is not affected by the setting of the mixer level control.

Adjust BASS and TREBLE as desired.

POWER BUTTON

Momentary pushbutton toggles the
amplifier between ON and STANDBY.

POWER INDICATOR

Glows dimly when unit is powered in
standby (sleep) mode; glows bright when
amplifier is on; flashes during power-up.

COMPRESSION INDICATOR

LED flashes when audio compressor is
acting on the amplified audio.