RDL ST-UMX3 Manual

RDL Stavblender ST-UMX3

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STICK-ON® SERIES

Model ST-UMX3

Universal Audio Mixer



Audio Mixing with Up To Three Inputs



Switch Selectable Mic or Line Inputs



Switch Selectable Mic or Line Output

 Add Additional Microphone or Line Level

Inputs to an Existing Mixer



Combine Signals of Different Level,

Impedance, or Bal. / Unbal. Configuration

The ST-UMX3 is part of a group of products in the STICK-ON series from Radio Design Labs. The durable bottom adhesive permits quick,

permanent or removable mounting nearly anywhere or it may be used with RDL’s racking accessories. The ST-UMX3 gives you the advantage of

a high performance audio mixer with a big PLUS, you can put it where you need it. STICK-ONs are designed, built and rated for continuous duty

in professional A/V systems.

APPLICATION: The ST-UMX3 is a three-channel audio mixer for combining mic-level or line-level signals

to a single output. A MIC/LINE switch is provided for each input. A separate MIC/LINE switch selects the

output level. Each input features a separate preamplifier circuit, which isolates it from the other inputs. An

audio-taper, single-turn gain adjustment is provided for each of the three input preamps. Signals from the

three preamps are actively summed and fed to the output line-level driver amplifier. The output amplifier

includes an RDL dual-LED VU meter.

The mic-level input circuits accept either balanced low-impedance mics or high-impedance unbalanced

mics. The line-level input circuits bridge any line-level audio source. The output is switch-selectable for

mic-level or line-level, and is capable of driving either high or low impedance, balanced or unbalanced

loads.

Each input level is set while observing the LED output level meter. The dual LED output meter follows

standard VU ballistics. The intensity of the green LED progresses from minimum at -11 dBu to full

intensity at +4 dBu. Flashing of the red LED is equivalent to a VU meter needle swinging above the

0 level. If the output is switched to MIC level, the meter continues to indicate correct operating level. The

output MIC level is padded 50dB below the normal LINE output level.

The ST-UMX3 is powered from ground-referenced 24 Vdc, permitting the module to share a common

power source with most RDL modules.

The flexibility of switching each input and the output between MIC or LINE allows installers to address a

wide variety of mixing solutions with only one product type. Wherever a flexible mic and line level mixing

amplifier is needed, the ST-UMX3 is the ideal choice. Use the ST-UMX3 individually, or combine it with

other RDL products as part of a complete audio/video system.

RDL 



 659 6th St. 



 Prescott, AZ., USA 86301 



 



 (928) 443-9391 FAX (928) 443-9392 



 www.rdlnet.com

STICK-ON® SERIES

Model ST-UMX3

Universal Audio Mixer

TYPICAL PERFORMANCE

Inputs (3): Mic: 600  balanced; Line: 50 k balanced

NOTE: MIC INPUTS ON ST-UMX3 ARE NOT PROTECTED

AGAINST PHANTOM VOLTAGE. USE THE ST MPA48 or

ST-MPA24 Mic Phantom Adapter.

Max Input Signal: Mic: -18 dBu; Line: +25 dBu

Gain (each input): Mic: Adjustable from OFF to 60 dB

Line: Adjustable from OFF to 21 dB

Output: 150   balanced; 75 unbalanced

Output Signal: +4 dBu nominal, mic level 50 dB below line level

THD+N: < 0.006%

IMD: Mic (@ 50dB gain): < 0.04%: Line: < 0.008%

Freq. Response: Mic: 50 Hz to 100 kHz (+/- 1 dB)

Line: 10 Hz to 100 kHz (+/- 0.05 dB)

Noise (each input): Mic: < -70 dB (50 dB gain)

Line: < -82 dB (unity gain)

Headroom: 18 dB

CMRR: Mic: > 60 dB; Line: > 50 dB (50 to 120 Hz)

Ambient Operating Environment: 0° C to 55° C

Power Req.: GROUND-REFERENCED, 24 Vdc @ 55 mA

Installation/Operation

Declaration of Conformity available from rdlnet.com.

Sole EMC specifications provided on product package.

Specifications are subject to change without notice.

891-1105C

Radio Design Labs Technical Support Centers

U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506

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

CONDENSER MIC CONNECTION

(USING ST-MPA24 OR ST-MPA48

MODULE FOR PHANTOM VOLTAGE)

Produkt Specifikationer

Mærke:	RDL
Kategori:	Stavblender
Model:	ST-UMX3

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