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rectangular box nearest the outside.
Power Switch
This is used for turning the power to the unit ON or OFF. The POWER LED on the front
panel will light to indicate when the power to the unit is turned ON.
Always make a habit of reducing the OUTPUT LEVEL control to zero before turning the
unit on or off. This is just good sense really as any bass connected to the input of the
amplifier could cause hum pick up or start feeding back if left unattended when the unit
is switched on.
Ventilation Slots
Ventilation slots are provided on the back of the unit to allow the free flow of air over the
heatsink to cool the output stage. Do not block or impede the airflow through these slots
or the amplifier will fail in use when the internal thermal trip cuts off your signal to the
speakers because of over temperature.
SPEAKER OUTPUTS
The 7-BAND range consists of two amplifier heads, AH150 and AH300, and three
combos, the 7210H, 7215 and 715. All have the same 7-BAND pre-amplifier.
AH150-7 and AH300-7.
The AH150-7 produces a minimum of 150Watts RMS power into a 4-Ohm load and the
AH300-7 produces a minimum of 300Watts RMS power into a 4-Ohm load. On both
amplifier heads there are two speaker output jack sockets provided, allowing two speaker
cabinets to be connected. The combined impedance of these speaker cabinets must not
be less than 4 Ohms. Two 8-Ohm cabinets is the ideal load for these amplifiers. It is good
practice to use both outputs for two cabinets rather than 'daisy-chaining' them as it
minimises the current required at the jacks and by the cable used.
If you are using one 4-Ohm cabinet, then no further speakers can be connected to
the amplifier or the combined impedance will fall below 4 Ohms. If this occurs you will
just be wasting power in heat generated by the output stage and no more volume will be
available than with the single 4 Ohm cabinet.
715 Combo
The 715 combo produces 150Watts into its internal 4-Ohm speaker and it is not possible
to add further speaker cabinets.
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