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It is recommended that the input and chassis ground terminals remain connected
with the factory-supplied jumper strap.
In situations where the power amp and its signal source are separated by great
distances, a ground voltage difference may exist between the amp's chassis ground and
the input cable's ground. Connection of these two grounds through the jumper strap
may cause large ground currents to flow (which is known as a ground loop), causing
a hum noise in the amp's output. Unless you have such a situation with a hum problem
that cannot be solved by using balanced input connections, the ground jumper strap
should remain in place.
2. NORMAL/BRIDGING SWITCH
This switch selects between NORMAL mode (70 Volt) in the "out" position
where both channels are in-phase, and BRIDGING mode (140 Volt) in the "in" position
where channel 2 is switched out-of-phase. In bridging mode, the channel 1 output
terminal is the (+) in-phase speaker output terminal and the channel 2 output terminal
becomes the (-) out-of-phase speaker terminal. To make the switch non-accessible, its
gray button is removable by simply pulling it straight off.
3. STEREO/MONO SWITCH
This switch selects between STEREO mode in the "out" position and MONO
mode (where channel 1 input is routed to both channels of the amp) in the "in" position.
In mono mode, an input signal needs only to be connected to channel 1. To make the
switch non-accessible, its gray button is removable by simply pulling it straight off.
4. LEVEL CONTROLS
The level controls allow attenuation (calibrated in dB) of the input signal. In
MONO mode, the CHANNEL ONE level control affects both output levels and
CHANNEL TWO level control is unused. It is recommended that the level controls
be operated at full level (0 dB attenuation) in most situations to maximize the headroom
in the signal source.
5. SPEAKER OUTPUTS
A four terminal barrier strip provides the two channels of output. In BRIDGING
mode (140 Volt), the channel 1 output terminal is the (+) in-phase speaker connection
and the channel 2 output terminal becomes the (-) out-of-phase speaker connection.
CAUTION! NEVER CONNECT THE TWO OUTPUT TERMINALS TOGETHER
OR CONNECT EITHER OUTPUT TERMINAL TO COMMON. To prevent
electric shock, always replace the barrier strip protective cover before applying power
to the amplifier.
Ashly P70 Owners Manual
Figure 8: Crossover Input Option
Figure 9: Mic/Line Mixer Input Option
Ashly P70 Owners Manual
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