RDL DS-SH1M, D-SH1M Quick Start Guide

Accessories

Models D-SH1/M and DS-SH1/M

Stereophonic Headphone Amps

ANYWHERE YOU NEED...

• A Panel-Mounted Headphone Amplifier

• A Wall-Mounted Headphone Amplifier

• Integral Long-Life VCA Stereo Level Control

• Balanced or Unbalanced Inputs

• Switch-Selectable Input Sensitivity

• Switch-Selectable Mono (Left) or Stereo Operation

• Amplifier To Drive High or Low Impedance Headsets

• Output: ¼ ” (6.3 mm) standard headphone jack (-SH1)

• Output: ⅛” (3.5 mm) mini jack (-SH1M)

• Convenience of Decora® Mounting Possibilities

You Need The D/DS-SH1/M!

The D/DS-SH1/M is a Decora-compatible stereophonic headphone amplifier from Radio Design Labs. All
metal enclosures are attractively finished in white or brushed stainless steel to complement the decor
encountered in commercial environments. Custom labeling is available at www.rdlnet.com

APPLICATION: The D/DS-SH1/M is used in applications requiring headphones of any impedance to be
driven from consumer or professional audio sources. The D/DS-SH1/M is ideally suited to applications as
diverse as language translation, museums, interview studios and music stores.

The D/DS-SH1/M is a dual channel headphone amplifier with balanced/unbalanced left (INPUT L) and
right (INPUT R) inputs. Each input accepts operating levels between -20 dBV and +20 dBu. Two
recessed slide switches located on the side of the rear enclosure are set prior to mounting the module.
One switch is provided for setting the INPUT SENSITIVITY. The MODE switch selects between stereo
and mono operation. In the MONO (L) position, the left input is used to drive both output channels. When
the module is used in a monaural system, only the left channel input must be wired. The front panel level
control is a long-life potentiometer controlling matched VCAs. Audio does not pass through this control,
assuring years of noise-free level adjustment. The output amplifiers deliver more than 50 mW into either
high or low impedance headphones through a durable, metal ¼” (6.3 mm) standard headphone
jack (-SH1) or a ⅛” (3.5 mm) mini jack (-SH1M).

Module operation is from a 24 Vdc ground-referenced power supply. It can also operate from a 12 Vdc
supply with a 6 dB reduction in headroom and a maximum output power of 10 mW.

The versatile input level range, low distortion, audio clarity and excellent crosstalk performance make this
module ideally suited to a wide variety of audio applications. Use this module in conjunction with other
RDL modules as part of a high quality, flexible audio/video system.

RDL • 659 N. 6th St. • Prescott, AZ., USA 86301 • [phone] • FAX [phone] • www.rdlnet.com

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Accessories

Models D-SH1/M and DS-SH1/M
Stereophonic Headphone Amp

24 Vdc

POWER

RDL PS-24

TYPE

SUPPLY

INPUT SENSITIVITY

MODE

SIGNAL

FROM

BALANCED

LINE-LEVEL

SOURCE

INPUT LINPUT R24 VDC

HI

LO

STEREO

MONO (L)

WIRING

24 Vdc

POWER

RDL PS-24

TYPE

SUPPLY

INPUT SENSITIVITY

MODE

Installation/Operation

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.

SIGNAL

FROM

UNBALANCED

LINE-LEVEL

SOURCE

LEFTRIGHTLEFTRIGHT

INPUT LINPUT R24 VDC

HI

LO

STEREO

MONO (L)

RDL D/DS-SH1/M

STEREO HEADPHONE AMPLFIER

RDL D/DS-SH1/M

STEREO HEADPHONE AMPLFIER

TYPICAL PERFORMANCE
Inputs (2): 10 kΩ balanced or unbalanced bridging
Input Level: +4 dBu nominal (Low input sensitivity) balanced;

-15 dBV nominal (High input sensitivity) unbalanced
Maximum Input Level: +21 dBu (Low input sensitivity) balanced;
+3 dBV (High input sensitivity) unbalanced
Output Signal (normal rated): 10 mW into 100 Ω
Output Signal (maximum): 50 mW into 100 Ω
THD+N: < 0.5% @ 1 kHz
Frequency Response: 30 Hz to 20 kHz (+/- 2 dB)
Noise: < -70 dB below normal operating level
Gain: User-adjustable on front panel;

18.5 dB (maximum, High input sensitivity);
Unity (maximum, Low input sensitivity)
CMRR: > 60 dB (50 to 120 Hz)
Crosstalk: Below noise floor (20 Hz to 20 kHz)
Power Requirement: 24 to 33 Vdc @ 50 mA, Ground referenced

Radio Design Labs Technical Support Centers

U.S.A. [phone], [phone]; Fax: [phone]

891-5350

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287