STICK-ON® SERIES
Model ST-SH2
Stereophonic Headphone Amp
ANYWHERE YOU NEED...
• A Stereophonic Headphone Amplifier
• Provision for External Stereo Level
Control
• Balanced or Unbalanced Inputs
• To Bridge a Line and Feed Headsets
• To Feed High or Low Impedance
Headsets
You Need The ST-SH2!
The ST-SH2 is part of the group of versatile STICK-ON products from Radio Design Labs. STICK-ONs
feature the advanced circuitry for which RDL products are known, combined with unequalled versatility in
mounting possibilities. The durable adhesives provided with the ST-SH2 permit permanent or removable
mounting. Numerous available mounting accessories, brackets, rack-mount and tabletop chassis are
optionally available to facilitate any system design.
FUNCTIONAL DESCRIPTION: The ST-SH2 is a dual channel headphone amplifier with
balanced/unbalanced left (L) and right (R) inputs. Each input is designed to accept an input signal with
operating levels between -20 dBV and +8 dBu. A multi-turn gain potentiometer is provided for setting the
maximum gain independently for each input channel. Terminals are provided for optional connection of an
external audio taper 10 kΩ potentiometer. Three terminals are used for an external stereo control:
Left-channel pot wiper (LEVEL ADJUST: L), Right-channel pot wiper (LEVEL ADJUST: R), and Ground
(common to both pot channels). The output amplifiers can each drive either high or low impedance
headphones, producing up to 250 mW into 8 Ω or 20 Vp-p into 2 kΩ.
Module operation is from a 24 Vdc ground-referenced power supply.
TYPICAL APPLICATION: The ST-SH2 is used in applications requiring headphones of any impedance to
be driven from consumer or professional audio sources. For fixed level installations not requiring user
volume control, the ST-SH2 is wired to the audio source and to a headphone jack. Frequently, it is
desirable to mount a volume knob by the headphone jack. The LEVEL ADJUST terminals (L) and (R)
may be wired to the respective wipers of a stereo 10 kΩ potentiometer to provide volume adjustment. It is
recommended that the ST-SH2 be located less than 39 in. (1m) from the jack and volume control.
The exceptional low noise (better than 100 dB below operating level), low distortion, audio clarity and
excellent crosstalk performance makes this module ideally suited to a wide variety of demanding 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 • (928) 443-9391 • FAX (928) 443-9392 • www.rdlnet.com
Installation/Operation
STICK-ON® SERIES
Model ST-SH2
Stereophonic Headphone Amp
STEREO HEADPHONE AMP
LEVEL ADJUST
OUTPUTS
L
L
RIGHT
R
GAIN
R
LEFT
GAIN
L
INPUTS
POWER
R
SIGNAL
FROM
BALANCED
LINE-LEVEL
SOURCE
DUAL
10 k
AUDIO TAPER
CCW
OPTIONAL
EXTERNAL VOLUME
CONTROL
NOTE: INTERNAL LEFT GAIN AND
RIGHT GAIN MUST BE SET TO
DESIRED MAXIMUM LEVEL
TYPICAL PERFORMANCE
Input: 10 kΩ balanced or unbalanced bridging
Input Signal: -20 dBu (-22 dBV) to +6 dBu (for normal output level: +4 dBu, 100 Ω)
-10 dBu to +16 dBu (for 250 mW, 8 Ω output)
Output Load Impedance: 8 Ω to 5 kΩ (Drives low or high impedance headphones)
Output Signal (normal rated): +4 dBu into 100 Ω
Output Signal (maximum): 250 mW into 8 Ω, 20 Vp-p into 2 kΩ
THD+N: < 0.005% (0.0015% typical @ 1 kHz)
Frequency Response: 20 Hz to 40 kHz (+/- 0.25 dB)
Noise: < -100 dB below normal operating level
Total Dynamic Range: > 115 dB
Gain: Adjustable from -2 to 24 dB
CMRR: > 50 dB at 100 Hz
Crosstalk: < -65 dB (10 Hz – 20 kHz); < -80 dB @ 1 kHz
Power Requirement: 24 to 33 Vdc @ 200 mA, Ground referenced
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
891-1055B
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
AUDIO
WIRING
LEFT
GAIN
SUPPLY
WIRING
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.
STEREO HEADPHONE AMP
LEVEL ADJUST
L
LEFT
GAIN
INPUTS POWER
L
R
SIGNAL
FROM
UNBALANCED
LINE-LEVEL
SOURCE
MONO PHONES
MAY BE
PLUGGED INTO
STEREO JACK
LEVEL ADJUST
OUTPUTS
L
L
L
INPUTS
POWER
R
24 Vdc
POWER
SOURCE
OUTPUTS
L
R
RDL PS-24
SUPPLY
R
RIGHT
R
TYPE
GAIN
R
RIGHT
GAIN
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