RDL D-SH1, DS-SH1 Quick Start Guide

Accessories

Models D-SH1 and DS-SH1

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

• Convenience of Decora® Mounting Possibilities

You Need The D/DS-SH1!

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

The D/DS-SH1 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.

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

Accessories

Models D-SH1 and DS-SH1
Stereophonic Headphone Amp

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.

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