Deriving the mono channel is accomplished by using the left channel positive wire as the
positive speaker wire and the right channel negative wire as the negative speaker wire. It
is important that a minimum 4 Ohm impedance is observed. If the impedance drops
below 4 Ohms while the amplifier is wired in the mono configuration, the AM H protection
circuit will engage.
The ability to run stereo satellites while simultaneously running a mono output from the
same output stage is accomplished simply by running the stereo speakers normally and
tapping into the appropriate wires for the "Mixed Mono" channel (left channel positive
wire as the positive speaker wire and the right channel negative wire as the negative
speaker wire). Again, speaker impedance should be 2 Ohms on the stereo channels and
4 Ohms on the mono channel.
On the left side panel of the A204, A404, and Ax400 are 2 sets of RCA-jacks (front and
rear). Connect your source unit to these inputs.
On the A204/A404, there is a switch which allows you to parallel the inputs. With the
2/4 way switch in the "in position" the front left input is paralleled with the rear left input
and the front right input is paralleled with the rear right input. In this mode, either the
front or the rear set of inputs may be used. With the switch in the "out position" all four
inputs are utilized and all outputs are separate.
On the Ax400, the internal crossover's setting will determine the function of the four
inputs. Depending upon your application, it is important that you refer to the Adjusting
the Internal Crossover Section before proceeding. The rear inputs are not active when
the crossover is set in the high-pass / low-pass or dual high-pass mode. Refer to the
Adjustring the Integrated Crossover Section for more information.
Gain Control
On the left end panel, next to the inputs, is the gain control. This control adjusts the level
of the input signal of your source unit. This control requires a small flat blade screwdriver
for adjustment. Upon installation of the amplifier, the gain control must be adjusted. This
can be done by first turning the gain all the way down (counter clockwise). Turn the
volume on the source unit up two thirds. Then adjust the gain control until the desired
volume is obtained without audible distortion.
Low Impedance Indicator
AM II circuitry will lower output power to maintain uninterrupted operation whenever the
amplifier senses an impedance load of less than 2 Ohms. The Low Impedance Indicator
(left-side end panel) is provided to let you know when the amplifier is operating in this
mode. It is important to note that there is no increase in output power below the 2 Ohm
threshold. Maximum power is achieved at 2 Ohms. In the case of a short circuit, AM It
will engage to protect the shorted channel but will continue to play the unaffected
channel. When this occurs, audible distortion will be heard. Turn-Off the system and
repair the short. Once the problem has been repaired, the amplifier will return to normal
operation.
Adjusting the Integrated Crossover (Ax400 only)
The Ax400 incorporates a two-way, electronic crossover featuring 18 dB per octave
slopes and 4 adjustable frequencies - 70 Hz, 110 Hz, 260 Hz, and 300 Hz. The
crossover is designed in a tracking configuration and only requires 2 channels of input
when engaged.
You can select four different modes of operation - 4 channels full-range, 2 channels
high-pass and 2 channels full-range, 2 channels high-pass and 2 channels low-pass, or
4 channels high-pass. Integral to this design is a set of RCA low-pass outputs. These
outputs are always available to send a low-pass signal to another amplifier or signal
processor.
The four different modes of operation will affect the number of available inputs. The
following list details available channels (pairs) of input versus operational mode (Refer
to Ax400 Crossover Modes)
:
4 Channels full-range:
2 Channels high-pass & 2 channels full-range:
2 Channels high-pass & 2 channels low-pass:
4 Channels high-pass:
2 pairs - front and rear
2 pairs - front and rear
1 pair - front only
1 pair - front only
HP ON ON
LP OFF OFF
On
Off
1
2
3
4
5
6
Switch Position
Switch
Not Used
Switch 6:
Turns the Front Channel
High-pass X-over
on and off
Switch 5:
Turns the Rear
Channel X-over
on and off
Switch 4:
Adjust the X-over mode
High-pass or Low-pass of
the Rear Channels
Switch 2 & 3
X-over Frequency
Adjustment
Active Switches
Figure D: Ax400 Integrated Crossover Adjustment Switch
The Front and Rear channels of your (four channel) Art Series amplifier are capable of
of being bridged into a mono output due to the internal design of the amplifier. This feature
permits the creation of a mono channel for a subwoofer or center channel. Also bridging
adds flexibility of operation. The Art Series four-channel amplifiers can be used as 2 mono
channels, 3 channels - 2 channel stereo and one channel mono, 4 channels - 2 channels
front and rear, 5 channels - 4 channels stereo and one channel mono, or 6 channels - 4
channels stereo and 2 channels mono.
Inputs
polarity before securing each wire. If inserting larger gauge wire presents a problem,
tinning the wire with solder may help. Be sure the connection is tight. The connector may
be plugged into the amplifier. (Refer to Figure C)
Bridging
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