RDL STCX2 Data Sheet

STICK-ON® SERIES

Model ST-CX2
Line-Level Crossover

ANYWHERE YOU NEED...

• Active Low-Frequency Woofer Equalization

• Active Full-Range Equalization

• Adjustable Equalization

• Crossover with Loop-through Output

• Low-Noise and Low-Distortion Crossover

• RDL SupplyFlex™ Power Input

Configuration

You Need The ST-CX2!

The ST-CX2 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-CX2 permit permanent or detachable
mounting. Numerous available mounting accessories, brackets and rack-mount chassis are optionally
available to facilitate any system design.

APPLICATION: The ST-CX2 is a line-level two band crossover to drive audio power amplifiers. The input
and outputs are balanced and may be connected unbalanced if necessary. The input accepts a +4 dBu
line-level signal. The module operates at nominal unity gain.

The FULL RANGE output is designed for use with full-range speaker systems which do not contain a
woofer (below 100 Hz). The passband is 100 Hz to 30 kHz, with an equalization adjustment centered at 2
kHz. Through the application of a smile-curve providing up to 8 dB attenuation through midband audio
frequencies, the performance of the whole system may be significantly enhanced.

The WOOFER output is designed for use with woofers amplified independently of any full-range speakers.
The passband is 40 Hz to 165 Hz when set flat, with an equalization BOOST adjustment centered at 50
Hz.

For systems also incorporating subwoofers, the LOOP THRU output connects to an input of the RDL
ST-CX1S Subwoofer Crossover. The ST-CX2 features RDL’s SupplyFlex power input configuration for
operation directly from ground-referenced, floating or bipolar 24 Vdc power.

The ST-CX2 features excellent frequency response, accurate active state-of-the-art filtering, and the
exceptional low-noise performance for which RDL products are known.

Wherever high quality, active equalization is needed to tailor the sound in a speaker system, the ST-CX2
is the ideal choice. Use the ST-CX2 individually, or combine it with other RDL RACK-UP
TX™, or FLAT-PAK™ series products as part of a complete audio/video system.

®

, STICK-ON,

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

STICK-ON® SERIES

Model ST-CX2
Line-Level Crossover

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.

25 TURN

CUT

ADJUST

M

I

D

INPUT

C
U
T

SIGNAL

FROM

BALANCED

LINE-LEVEL

SOURCE

LINE - LEVEL CROSSOVER

OUTPUTS

FULL RANGELOOP THRU

WOOFER

PWR

U

SIGNAL

FEEDING

BALANCED

LINE-LEVEL

EQUIPMENT

B
O
O
S
T

AUDIO

WIRING

25 TURN

BOOST

ADJUST

USE LOOP THRU

OUTPUT TO FEED

RDL ST-CX1S INPUT

M

I

D

INPUT

C
U
T

OPTIONAL JUMPER

(WHEN USING GROUND-REFERENCED POWER SUPPLY)

LINE - LEVEL CROSSOVER

WOOFER

FULL RANGELOOP THRU

M

I

D

INPUT

C
U
T

SIGNAL

FROM

UNBALANCED

LINE-LEVEL

SOURCE

B
O

PWR

O
S
T

U

24 VDC
POWER

SOURCE

LINE - LEVEL CROSSOVER

OUTPUTS

WOOFER

FULL RANGELOOP THRU

SIGNAL

FEEDING

UNBALANCED

LINE-LEVEL

EQUIPMENT

POWER
WIRING

DO NOT

GROUND

NEGATIVE

FOR FLOATING

OR BIPOLAR

POWER

INSTALLATION

OR

GROUND

NEGATIVE

FOR GROUND-

REFERENCED

POWER

INSTALLATION

VEL CROSSOVER

OUTPUTSOUTPUTS

LL RANGE

B
O

PWR

O
S
T

U

PWR

WOOFER

U

12

G

OR

N

15

D

Vdc

BIPOLAR SUPPLY

OR
Vdc

B
O
O
S
T

12
15

TYPICAL PERFORMANCE

Input : 50 kΩ balanced line-level (+4 dBu)
Outputs (2): 150 Ω balanced line-level (+4 dBu)
Headroom: > 18 dB
Gain: Unity (nominal, equalization set flat)
Out-of-Band Rolloff: 18 dB/octave

FULL RANGE Output:

Frequency Response: 100 Hz to 30 kHz (+/- 0.5 dB)
THD+N: < 0.075% (100 Hz to 30 kHz)
Residual Noise: < -80 dB (referred to +4 dBu)

WOOFER Output:

Frequency Response: 40 Hz to 165 Hz (+/- 0.5 dB)
THD+N: < 0.025% (40 Hz to 165 Hz)
Residual Noise: < -95 dB (referred to +4 dBu)
Power Requirement: 24 to 33 Vdc @ 40 mA, SupplyFlex (Ground-referenced or Floating)

Radio Design Labs Technical Support Centers

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

891-1145

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