RDL STHP3 Installation Guide
STICK-ON® SERIES
Model ST-HP3
Dual High-Pass Filters
ANYWHERE YOU NEED...
• Horn Loudspeaker Protection
• Low-Frequency Attenuation below 300 Hz
• Low-Frequency Attenuation below 500 Hz
• Line-Level Input and Outputs
• Filtering Requiring no Field Adjustment
• RDL SupplyFlex™
Configuration
Power Input
You Need The ST-HP3!
The ST-HP3 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 unequaled versatility in
mounting possibilities. The durable adhesives provided with the ST-HP3 permit permanent or removable
mounting. Numerous available mounting accessories, brackets and rack-mount chassis are optionally
available to facilitate any system design.
APPLICATION: The ST-HP3 is the ideal choice where line-level audio filtering needs to be provided at the
input of a power amplifier for protection of public address horns against damage from low frequencies.
The ST-HP3 has one input and two filtered outputs: 300 Hz high pass and 500 Hz high pass. Both the
input and output are balanced, and each may be wired unbalanced if required. The input accepts line-level
(+4 dBu nominal) audio. The module operates at unity gain (balanced input and output).
Each output is filtered through a separate 18 dB per octave low-noise active audio filter. The -3 dB
frequency of the 300 Hz output is 225 Hz. The -3 dB frequency of the 500 Hz output is 450 Hz. The two
outputs may be used simultaneously.
The ST-HP3 features RDL’s SupplyFlex power input configuration for operation directly from groundreferenced, floating or bipolar 24 Vdc power.
Wherever a public address high-pass filter is needed, the ST-HP3 is the ideal choice. Use the ST-HP3
®
combined with other RDL RACK-UP
complete audio/video system.
RDL • 659 N. 6th St. • Prescott, AZ., USA 86301 • (928) 443-9391 • FAX (928) 443-9392 • www.rdlnet.com
, STICK-ON, TX™, or FLAT-PAK™ series products as part of a
STICK-ON® SERIES
Model ST-HP3
Dual High-Pass Filters
DUAL HIGH PASS FILTERS
ACTIVE LINE-LEVEL FILTERING
INPUT
SIGNAL
FROM
BALANCED
LINE-LEVEL
SOURCE
(WHEN USING GROUND-REFERENCED POWER SUPPLY)
OPTIONAL JUMPER
RDL PS-24
TYPE
SUPPLY
300 HZ OUTPUT500 HZ OUTPUT
SIGNAL
FEEDING
BALANCED
LINE-LEVEL
EQUIPMENT
DUAL HIGH PASS FILTERS
ACTIVE LINE-LEVEL FILTERING
300 HZ OUTPUT500 HZ OUTPUT PWRGNDINPUT
+20dBu
PWR
GND
U
USE LOOP THRU
OUTPUTS TO FEED
U
24 Vdc
POWER
SOURCE
AUDIO
WIRING
RDL ST-CX1S
SUPPLY
WIRING
DO NOT
GROUND
NEGATIVE
FOR FLOATING
OR BIPOLAR
POWER
INSTALLATION
OR
GROUND
NEGATIVE
FOR GROUNDREFERENCED
POWER
INSTALLATION
SIGNAL
FROM
UNBALANCED
LINE-LEVEL
SOURCE
INPUT
AUXILIARY
BIPOLAR
SUPPLY
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.
DUAL HIGH PASS FILTERS
ACTIVE LINE-LEVEL FILTERING
300 HZ OUTPUT500 HZ OUTPUT PWRGNDINPUT
U
SIGNAL
FEEDING
UNBALANCED
LINE-LEVEL
EQUIPMENT
DUAL HIGH PASS FILTERS
ACTIVE LINE-LEVEL FILTERING
300 HZ OUTPUT500 HZ OUTPUT
PWR
GND
U
12
12
G
OR
OR
N
15
15
D
Vdc
Vdc
BIPOLAR SUPPLY
0dBu
-20dBu
-40dBu
-60dBu
-80dBu
Hz Hz Hz Hz KHz
200
Hz
ST-HP3 RESPONSE
TYPICAL PERFORMANCE
Input: 20 kΩ balanced line level (+4 dBu)
Outputs (2): 150 Ω balanced line level (+4 dBu)
Headroom: > 18 dB
Attenuation Curve: 18 dB/octave
THD+N: < 0.01%
Residual Noise: < 90 dB (referred to +4 dBu)
Insertion Loss: < 2 dB
Headroom: 18 dB
891-1150
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
11005010 500
10 305
KHz KHz KHz
500 HZ OUTPUT300 HZ OUTPUT
300 Hz Output:
Frequency Response: 300 Hz to 30 kHz (+/- 0.5 dB)
-3 dB Frequency: 225 Hz
500 Hz Output:
Frequency Response: 500 Hz to 30 kHz (+/- 1.0 dB)
-3 dB Frequency: 450 Hz
Power Requirement: 24 to 33 Vdc @ 30 mA
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