Specifications

Section
4
page
89
Professional Audio
4
MCMelectronics.com
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RDL
Distribution
Amplifier
Audio distribution
amplifier allows
bridging of any
audio line,
adjusting the gain
(0~+20dB), and driving either high or low impedance,
balanced or unbalanced loads. Typical applications:
•Audio distribution with up to 3 outputs •Bridging
a line for local distribution •Distribution with impedance
conversion •Distribution with gain or loss •Inputs and
outputs RF bypassed •Power requirements: 24~30VDC
floating or 12~15VDC bipolar supply, 50mA
Order # ONLY
555-ST-DA3 $120.00
RDL Electronic
Transformer
Pair
Perfect for any
line amplification,
impedance
or balanced/
unbalanced
conversion, this two channel line amplifier features
bridging inputs, adjustable gain (up to 20db), or
attenuation, and low impedance outputs, which act as
both an electronic line transformer and a line amplifier.
True DC amplifiers produce unsurpassed audio clarity,
high common-mode rejection and ultra–low distortion.
Typical applications: •Balanced to unbalanced
conversion•Unbalanced to balanced conversion•High
to low impedance conversion •Low to high impedance
conversion •Bridging audio line feeds •Precise matching
of audio levels •Power requirement: 24~30VDC floating
or 12~15VDC bipolar supply, 50mA
Order # ONLY
555-STA-1 $127.00
RDL Two
Channel High
Output Line
Amplifier
Many audio
products provide
optimum
performance
when feeding a bridging input, but may not provide
output needed to directly drive low impedance lines
terminated with 600ohm transformers. Specifically
designed for such installations, this is also ideal when
high gain line level audio transmission is required. Audio
inputs are bridged at 5Kohm and gain is adjustable from
unity to +24dB via a precision 25–turn potentiometer.
Outputs are designed to drive long balanced audio lines
into 600ohm loads. Audio circuits DC coupled for the
ultimate in pure, transparent audio clarity. Input and
output circuits function as electronic transformers,
permitting either balanced or unbalanced connection.
Typical applications: •Conversion from balanced to
unbalanced •Conversion from high to low impedance
•Power requirements: 24~30VDC floating or 12~15VDC
bipolar supply, 50mA
Order # ONLY
555-STA-2 $134.00
RDL Audio
Line Amplifier
Allows bridging
any audio line,
adjusting the
gain, and driving
a balanced or
unbalanced line.
Circuit design allows input to accept either balanced
or unbalanced signals, of either high or low impedance.
Instrumentation type input stage amplifies the
differential input, regardless of ground reference. The
output is capable of driving high or low impedance,
balanced or unbalanced loads. Typical applications:
•Single channel line amplifier •Precise matching of audio
levels •Isolation of ground loops •High to low or low
to high impedance conversion •Power requirements:
24~30VDC floating or 12~15VDC bipolar supply,
50mA •Dimensions: 1.55" (H) x 3.00" (W) x 0.65" (D)
Order # ONLY
555-STA-1M $94.49
RDL Application Specific Audio Modules
Radio Design Labs is known, throughout the commercial sound industry, for innovative,
low cost, flexible solutions to difficult audio challenges. Their application specific
modules provide easy control, filtering, switching and distribution of audio signals,
in permanently installed systems. The ultra–compact Stick–OnSeries (ST) features
a durable bottom adhesive pad, for quick, permanent mounting nearly anywhere. High
quality screw terminal strips accept 14~30AWG wire. The compact Rack-Up Series
(RU) feature accessible user–friendly controls and displays, with the ability to mount up
to three units in a single rack space. The Flat–Pak Series (FP) feature durable, all metal
cases that may be directly screwed or bolted to cabinets or shelves. All controls and
connections are top mounted, allowing close placement of multiple modules. All Flat–Pak
modules are supplied with a power interconnect cable for daisy-chaining multiple
modules from a single power supply. Detailed description, specification and application
sheets are available on request.
RDL Universal
Audio
Attenuator
Use to reduce
the input level
to a machine
to improve
headroom, feed a
line level signal to a mic level input, or simply lower the
level of an audio line to match standard system levels.
Two–channel variable attenuator utilizes dual 15 turn
potentiometers for precise, independent adjustment of
each channel. Passive circuit requires no power, and
provides up to 85dB attenuation. Typical applications:
•Convert 8ohm, 25V or 70V speaker output to 600ohm
input (two channels) •Convert Hi-Z line level source to
Hi-Z mic input (two channels) •Convert 8ohm speaker
to line input (two channels) •Convert balanced Lo-Z
line level to balanced Lo-Z mic input (one channel)
Order # ONLY
555-STP-1 $53.49
RDL
Microphone
Preamplifier
Compact,
high quality
preamplifier
converts balanced
or unbalanced
mic input, to dual, balanced or unbalanced, isolated
+4dBu line level outputs, for use with commercial
sound equipment. Additionally, the input will accept
low impedances, such as a 4ohm or 8ohm speaker, for
use in intercom applications. Output is adjustable from
35~65dB gain. Separate phantom power insertion allows
the use of an external phantom power supply, up to
48VDC. Unit requires a 24~33VDC, 25mA ground
referenced power supply, which may also be tied to the
phantom input for single power supply use. Unit may
be operated with supply as low as 9VDC, with
reduced headroom.
Order # ONLY
555-STM-2 $124.00
RDL Two–Watt
Utility
Amplifier
Perfect for use as
a local monitor
amplifier and
with music-on-
hold telephone
systems. It features a single unbalanced audio input,
with adjustable gain, and two outputs. The first output
delivers 2W RMS into an 8ohm load, the second delivers
up to +12dBu into a 600ohm load, typical of telephone
music–on–hold inputs. Both outputs may be used
simultaneously. Specifications: •Frequency response
(600ohm): 20Hz~30KHz •Frequency response (8ohm):
35Hz~30KHz •THD: 0.5% •Input: 10Kohm, -15dBV
(line level) •Power requirements: 24~33VDC, 150mA,
ground referenced
Order # ONLY
555-ST-PA2 $60.00
RDL Voice
Activated
Relay
Versatile
module accepts
unbalanced line
or mic level
signal and
provides switched DPDT contacts. An open collector
output is also provided for slave units. Applications
include converting PTT (push to talk) function to hands
free, automatic muting and audio signal sensing for
auto–power–on function. Sensitivity and release delay
are adjusted via individual 25 turn potentiometers.
Specifications: •Mic input: 5KΩ •Line input: 500KΩ
•Activation response: 5ms •Release delay: 70~260ms
•Relay contacts: DPDT, 2A •Power requirement:
24~33VDC, 30mA ground referenced
Order # ONLY
555-ST-VOX1 $92.69
RDL Audio
Controlled
Relay
Accepts balanced
or unbalanced
input, and
provides a DPDT
relay output when
the presence of an audio signal is detected. It is perfect
when adding “audio–power–on” capability to existing
equipment. Because the relay utilizes NO and NC
contacts, it may also be used in “silence sensing”
applications. Trigger threshold is adjustable from
–30dBu~0dBu. Adjustable, 5~50 second, off delay sets
the time required to for the relay to release when the
audio drops below threshold. A 50mA open–collector
output is also provided to drive a slave relay or indicator
LED. Specifications: •Contact rating: 2A, 250VAC
•Input impedance: 10Kohm •Power requirement:
24~33VDC, 50mA, ground referenced
Order # ONLY
555-ST-ACR2 $85.49