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Why are the signal inputs and speaker outputs numbered rather than labeled "left" and "right"?
MS Series amplifiers are designed to make integration into any system simple and straightforward. The amplifier
includes a digital input-mixer control, which eliminates the need for Y adapters and allows any pair of output
channels to be driven by a mono or stereo signal for maximum system-building flexibility. Labeling the channels
"left" and "right" would be confusing in some applications.
How does the digital input mixer work?
The signals from each of the RCA-type input connectors are converted into digital signals and sent to the digital
signal processor. Inside the DSP, those signals are routed to the speaker output pairs, according to the selections in
the input mixers. There's one input mixer for output channels 1 and 2 (upper display) and another mixer for channels
3 and 4 (lower display). For example, selecting "1" in the input mixer for channels 1 and 2 will send only the signal
connected to Input Jack 1 to output channels 1 and 2 (see Figure 1). This is useful for sending a mono signal to a
pair of channels.
Figure 1.
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Selecting "1, 2" in the input mixer for channels 1 and 2 will send the signal that is connected to Input Jack 1 to
Output 1 and the signal connected to Input Jack 2 to Output 2 (see Figure 2). This is designed for stereo signals.
Figure 2.
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If you want all four output channels to receive the same signal, connect that signal to Input Jack 1 (or 3) and select "1"
(or "3") in both input mixers. If you want all four channels to receive separate signals, choose "1, 2" in one input mixer
and "3, 4" in the other. Many system configurations are possible and Y adapters are never needed. See "System
Diagrams" for more examples.
Does the amplifier include speaker-level and line-level inputs?
Yes, any input signal can be used with MS Series amplifiers. If your head unit includes RCA-type outputs, simply
plug them into the RCA-type input jacks. If your head unit does not include RCA-type outputs (as is the case with
all factory-installed systems), use the included RCA-to-bare-wire adapters. Be sure to observe proper polarity. The
signal inputs are differential and will accept any signal from 100mV (low-level) to 15V (high-level). There's no need to
use separate adapters or to precisely determine the signal voltage or type. MS Series amplifiers' onboard tools and
the setup procedure described later in this manual will make optimizing the configuration simple.
The factory-installet( system in my car shows a "speaker disconnected" message, or it fails to play when
a speaker is disconnected or when an amplifier is connected to its output. What should I do?
MS Series amplifiers include three Input Signal Selector positions: Lo, Hi and Hi2. The Hi2 position includes a circuit
designed to fool the factory system into "seeing" a speaker connected to its output. If your car has one of these
systems, set the Input Signal Selector to Hi2 and follow the rest of the setup instructions.
My factory-installed head unit does not include a remote-tum-on wire. What should I do?
MS Series amplifiers include signal-sensing turn-on. A remote-tum-on connection is never required. The amplifier will
sense the presence of an audio signal at its inputs and turn on automatically. A few minutes after the signal stops or
after the radio is turned off, the amplifier automatically will turn itself off. During the delay, the amplifier draws very little
current so the vehicle's battery won't be drained.
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