RDL FPALC2 Data Sheet

™

FLAT-PAK

Model FP-ALC2

SERIES

Automatic Level Control

ANYWHERE YOU NEED...

•

Consistent Levels from Variable Sources

•

Split-Band AGC for Audio Transparency

•

Self-Adjusting Attack and Release Times

•

AGC with Simple Single Control Setup

•

Level Control Range >20 dB

•

Gated Control to Avoid Level “Seeking”

•

Convenience of RDL FLAT-PAKs

You Need The FP-ALC2!

The FP-ALC2 is part of the group of versatile FLAT-PAK products from Radio Design Labs. The unique FLAT-PAK
case can be directly screwed or bolted to cabinets or shelves. Optionally available rack-mounting accessories permit
single or multiple FLAT-PAK module mounting. All FLAT-PAK modules are supplied with a power interconnect cable
for daisy-chaining multiple modules from a single power supply.

APPLICATION:

from consumer sources with varying audio output levels. Power connections are made using either the full-size barrier
block terminals or a dc power jack located in one end panel. A second dc power jack is provided on the other end
panel for connecting additional FLAT-PAK modules.

The FP-ALC2 is a two channel (stereo) module featuring phono jack
makes installation simple and efficient. The gain adjustment is set as high as possible with the loudest source without
the

INPUT OVERLOAD

sound systems fed from variable audio source levels, such as multiple CD changers or satellite receivers, benefit from
consistent levels.

The automatic level control circuitry in the FP-ALC2 maintains a consistent –10 dBV output for input signal variations
as great as 25 dB. Yet the operation of the module is nearly transparent to the listener for a wide variety of source
material from rock to classical. The level pumping effect frequently associated with automatic gain and compression
devices is minimized in the FP-ALC2 by controlling mid and high band audio separately from the bass frequencies.
The automatic gain circuitry and compression attack release times adjust according to the program material to further
reduce any audible effects of the module. The level seeking effect also associated with various automatic level
products is avoided in the FP-ALC2. When audio levels fall and remain below a level appropriate to that source, the
module stops increasing the gain. As audio levels fade out, the module tracks the level for a natural sound. These
features combine to produce nearly inaudible adjustment yet consistent levels without the listener fatigue associated
heavily compressed music dynamics.

The FP-ALC2’s low profile and compact size permit mounting in confined spaces and in various locations in equipment
racks. The location of the input/output jacks permits high density mounting against flat surfaces while maintaining
accessibility to the connectors. The economical cost can provide assurance of correct signal levels in nearly any stereo
audio system. The FP-ALC2 may be mounted where needed, to rack sides or in an equipment rack (either the front or
rear rack rails) using the RDL FP-RRA. Use the FP-ALC2 individually, or combine it with other RDL products as part of
a complete audio/video system.

The FP-ALC2 is the ideal choice in many applications where consistent stereo audio levels are needed

INPUTS

indicator flashing. No further adjustments are needed. Foreground as well as background

and

OUTPUTS

. A single user adjustment

RDL •• P.O. Box 1286 •• Carpinteria, CA., USA 93014 •• [phone] •• FAX [phone] •• http://www.rdlnet.com

™

FLAT-PAK

SERIES

Model FP-ALC2
Automatic Level Control

2A MAX

BUS

GAIN

INPUT OVERLOAD

INPUTS

OR

24 VDC

POWER

SOURCE

24 VDC

1A MAX

POWER

INPUT

LEFT

OUTPUTS

RIGHT

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.

Power to Additional

80 mA

FP-ALC2

CURRENT

2A MAX

PWR BUS

1) FEED INPUT WITH LOUDEST EXPECTED SIGNAL

2) SET GAIN CONTROL SO "INPUT OVERLOAD" LED
DOES NOT FLASH REGULARLY

Flat-Pak Modules, Total

Current Not to Exceed 2 A

or Available Supply Current

TYPICAL SETTING
FOR CONSUMER INPUT

ADJUSTMENT

UNBALANCED

STEREO SOURCE

OUTPUT TO OTHER

UNBALANCED STEREO

EQUIPMENT

TYPICAL PERFORMANCE

Inputs (2): 10 kΩ unbalanced phono jack
Input Level: -10 dBV (nominal)
Output: 200 Ω unbalanced phono jack
Output Level: -10 dBV
Automatic Level Range: -30 to 0 dBV
Gate Threshold: -40 dBV (20 Hz to 3 kHz)
Frequency Response (excluding AGC): 20 Hz to 20 kHz (+/- 0.5 dB)
THD+N (excluding AGC): < 0.15% (20 Hz to 20 kHz)
Noise: < -90 dB (below –10 dBV)
Crosstalk: -75 dB (typical, 1 kHz)
Headroom: > 18 dB
Indicator (1):

INPUT OVERLOAD

Power Requirement: 24 Vdc @ 80 mA, Ground-referenced
Overall Dimensions: Height: 1.20 in. 3.05 cm
Width: 3.25 in. 8.26 cm
Length: 5.75 in. 14.61 cm

891-2087A

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

Radio Design Labs Technical Support Centers

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