ALC-1809 LOUDSPEAKER CONTROLLER
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WELCOME
The ALC-1809 Amplified Loudspeaker Controller (ALC) is the nucleus of all Theory audio systems and is responsi-
ble 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 subwoof-
ers in commercial and residential audio installations, including distributed audio, surround sound and hi-fi/stereo.
TERMINOLOGY
This manual covers PRO hardware and software features that span a couple generations and therefore certain terms
are used interchangeably. “ALC”, “loudspeaker controller”, “amplified loudspeaker controller” and sometimes “ampli-
fier” may be used within this manual to reference the PRO 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.
CAUTION: Do not connect subwoofers to speaker output channels 3-8, even when bridged.
Channels 3-8 are rated for full-range speakers only.
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WELCOME
