RDL STP-1 Datasheet

STICK-ON® SERIES

Model STP-1
Dual Variable Attenuator

 Audio Level Attenuation
 Adjust Audio Into Equipment
 Preset Audio Levels
 Precisely Match Audio Levels
 Increase Audio Input Headroom

 Two Adjustable Attenuators in

One Package

The STP-1 is part of a group of products in the STICK-ON series from Radio Design Labs. The durable adhesives provided with the STP-1 permit
permanent or removable mounting. Numerous available mounting accessories, brackets and rack-mount chassis are optionally available to
facilitate any system design. STICK-ONs are designed, built and rated for continuous duty in professional A/V systems.

APPLICATION: The STP-1 is a convenient attenuator pad that can be located at the precise location that
attenuation is needed without the normal unsightly twisted-resistor pads that are all so common. Some
features of the STP-1 are:

 Permits precise calibration of all levels in your audio system
 2 attenuators provided in each STP-1
 Multi-turn trimmers for precise adjustment
 Very wide range of attenuation; from speaker level inputs to mic outputs
 Operates with balanced or unbalanced inputs/outputs
 No lugs required for reliable connections
 Full operation in either high or low impedance circuits
 Attenuator pads totally self-contained; no jumpers to select or resistors to attach
 Allows the engineer to quickly, efficiently, attenuate any signal; cleanly, neatly, and with proper

impedance match

 Recessed adjustment discourages tampering.

Whether you need to reduce the input level to a machine to improve headroom, feed a line level signal into
a mic level input, or simply lower the level of an audio line to match your systems standard levels, the
STP-1 is the simple and economic answer. Use the STP-1 individually, or combine it with other RDL
products as part of a complete audio/video system.

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

STICK-ON® SERIES

Model STP-1
Dual Variable Attenuator

Installation/Operation

Declaration of Conformity available from rdlnet.com.

Sole EMC specifications provided on product package.

Specifications are subject to change without notice.

TYPICAL PERFORMANCE

Attenuation: Hi-Z balanced line: Adjustable 1 dB to 85 dB

Nominal Impedance: Hi-Z 10 k, Lo-Z 600 
Circuit Type: Passive modified H &T pads
Adjustment: Screwdriver trimming adjustment, 15 turns continuous
Balanced: Counter-clockwise adjustment increases attenuation
Unbalanced: Clockwise adjustment increases attenuation
Connections: Terminal block accepts 14 to 24 gauge wire; no lugs required;
input / output connection legend located on STP-1
Maximum Signal Inputs: Hi-Z balanced line: +33 dB 35 V rms
Lo-Z balanced line: +27 dB 18 V rms

Reference Levels: Line level is +10 dBu to -10 dBu
Mic level is -45 dBu to -65 dBu
0 dB = 0.775 V rms into specified load
Ambient Operating Environment: -20° C to 60° C
Power Requirement: Passive (not required)

Lo-Z balanced Line: Adjustable 5 dB to 35 dB
Hi-Z unbalanced Line: Adjustable 1 dB to 85 dB

Hi-Z unbalanced line: +35 dB 45 V rms

Radio Design Labs Technical Support Centers

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

891-0042L

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