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ALC-1809

9-CHANNEL AMPLIFIED LOUDSPEAKER CONTROLLER

Description

ALC-1809 LOUDSPEAKER CONTROLLER
The ALC-1809 Amplified Loudspeaker Controller (ALC) is the nucleus of all Theory audio systems and is responsible for all signal processing and power amplification for Theory loudspeakers and subwoofer systems. Every Theory audio system requires at least one Loudspeaker Controller

WHAT IS AN “AMPLIFIED LOUDSPEAKER CONTROLLER”?
The ALC-1809 Amplified Loudspeaker Controller (ALC) is a multi-channel 96kHz/32-bit digital signal processor and multi-channel power ALC built into a single 1U chassis. The ALC is responsible for all signal conditioning and power amplification required to operate all Theory loudspeaker and subwoofer models.

The amplifier power and features of the ALC-1809 have been optimized to run Theory loudspeakers and subwoofers in commercial and residential audio installations, including distributed audio, surround sound and hi-fi/stereo.

TERMINOLOGY
This manual covers THEORY hardware and software features that span a couple generations and therefore certain terms are used interchangeably. “ALC”, “loudspeaker controller”, “amplified loudspeaker controller” and sometimes “amplifier” may be used within this manual to reference the THEORY multichannel amplified loudspeaker controllers.

POWER OUTPUT LIMITATIONS
SUBWOOFER CHANNELS 0-1-2
Channels 0-1-2 of the ALC-1809 are rated at 300W (into 4-ohms) and are intended to drive subwoofers and full range speakers. Note that Channel 0, while it is an independent amplifier channel capable of driving subwoofers, the signal driving it is always the same signal that is routed to the Channel 1 output. Channel 0 is in effect a “copy” of the Channel 1 signal.

FULL RANGE CHANNELS 3-8
Channels 3-8 of the ALC-1809 are rated at 100W (into 4-ohms) and are intended to drive full range speakers ONLY. Channels 3-8 cannot drive subwoofers. When bridged, channel pairs 3-8 can only drive 8-ohm loads. Do not connect bridged channels to 4-ohm loudspeaker loads.

CAUTION: Do not connect subwoofers to speaker output channels 3-8, even when bridged. Channels 3-8 are rated for full-range, 8-ohm speakers only.

INCLUDED ACCESSORIES:
RACK EARS – 2 EACH
EURO AUDIO INPUT/LOOP CONNECTOR – 8 EACH
EURO TRIGGER INPUT CONNECTOR – 2 EACH
EURO TRIGGER RESISTOR ACCESSORY – 1 EACH
EURO-TO-XLR ADAPTER – 8 EACH
EURO LOUDSPEAKER OUTPUT CONNECTOR – 9 EACH
IEC US 20A POWER CORD – 1 EACH
MINI USB CABLE – 1 EACH (NOT SHOWN)

SHELF MOUNTING
The ALC-1809 ships with small rubber feet attached to the chassis bottom panel allowing the unit to be placed on a shelf or table top when rack mounting is not desired.

RACK MOUNTING
The ALC-1809 ships from the factory with rack mount ears and specific long screws in an accessory bag . The rack ears may be installed to the chassis using these long screws as shown above.

To keep the equipment and listening rooms as quiet as possible, the ALC-1809 does not have cooling fans and therefore relies on convection to remove waste heat from the chassis. The good news is, however, that the ALC1809 is extremely efficient (> 80% efficiency). Still, with 1,800 watts per chassis, even with 80% efficiency it does generate a modest amount of heat, especially at idle. (Refer to the SPECIFICATIONS section for more information).

For this reason, it is recommended that you place a 1U spacer between the ALC-1809 chassis and any neighboring equipment, including other Theory and Pro Audio Technology ALCs, to insure adequate ventilation. During normal operation, the front panels of the ALC-1809 will become warm to the touch, but will not become hot.

To further minimize heat generated at idle, it is recommended that you take advantage of the STANDBY feature of the controller, and place it into STANDBY whenever not in use. This will keep power consumption and therefore waste heat to a minimum.

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Description:
9-Channel Amplified Digital Loudspeaker Controller
Inputs:
8 x Balanced Analog Audio w Loop Outputs (1 mic/line level switchable)
Outputs:
9 x Speaker Outputs
8 x Balanced Analog Audio Looping Outputs
12VDC/Contact Closure Trigger Loop Output
Trigger:
+12VDC or Contact Closure Trigger Input w Loop
Surround Formats Supported:
3.1, 3.2, 3.3, 5.1, 5.2, 5.3, 7.1, 7.2, 5.2.2 ATMOS
Audio Operation:
96kHz/24-bit
On-Board DSP:
96kHz/32-bit
DSP Features:
Automatic Configuration of Surround System Settings
Loudspeaker Processing For All Theory and PRO Models
Input Trim
Signal Routing
Gain
Delay (up to 75msec per channel)
160 Parametric EQ Filters (20 per channel)
8 x 8 Parametric Bass Management (Bass Steering)
Mono Summing: 8 Stereo + 4 mono Signals
Bass and Treble Controls
Master Volume
Clip Limiter
Internal Sine and Pink Noise Sources
Bandwidth:
5.5Hz-40.6kHz, -6dB
Frequency Response:
20Hz-20kHz, +/-0.2dB
Amplifier Power Output:
Channels 0-1-2: 300W, 4-ohms
Channels 3-8: 100W, 4-ohms, bridgeable to 300W*
Voltage Gain (all channels):
30dB
Input Sensitivity:
Channels 0-2: 1.1V
Channels 3-8: 660mV
Power Requirements:
Standby: 16W
Idle: 41W
(1/8 power, all ch. driven): 281W
Idle Noise (speaker program, typ., A-wt.):
Channels 0-2: -82dBV (0.00008V)
Channels 3-8: -80dBV (0.00010V)
Signal to Noise Ratio:
Channels 0-2: 108dB
Channels 3-8: 105dB
Distortion (1kHz, 1dB below max output):
<0.02%
AC Operation:
100V-240VAC, 50-60Hz
Finish: Matte Bright Aluminum
Dimensions:
1.75″ H x 17″ W x 15″ D
1.75″ H x 19″ W x 15″ D w Rack Ears
Accessories:
8 x Euro-to-XLR Adapters Included
Software:
Theory Music and Surround Automator™
Auto system configuration tool
Weight:
13 lbs.
*Bridged channels ok for sb speaker models only, not for subwoofer use.

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