Ashly P70-800 Manuel du propriétaire - Page 4

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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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