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Using your A70 amplifier
Front panel controls
This section describes how to operate your amplifier.
If you are installing the amplifier yourself, you should first read the ‘Installation’ section on page 4.
POWER (and power indicator light)
Switches the unit on and off. (You can also switch the amplifier into standby mode with the remote
The light indicates the status of the amplifier. A red light means the amplifier is in standby mode (press
the POWER/STANDBY button on the remote control, or the POWER button on the front panel, to switch
between standby and powered-up modes).
When you switch your amplifier on, the light glows amber for a few seconds, during which time the
speakers are disconnected. The light changes to green when the amplifier is ready for use.
The light may flash if a fault has occurred – the fault type is shown on the display. You should unplug the
amplifier and leave it for a few minutes before reconnecting. If the fault cannot be cleared, unplug your
amplifier and contact your Arcam dealer.
These buttons select the source connected to the corresponding input.The input currently selected is
indicated by text on the display.
This input is similar to the other line level inputs on the amplifier and may be used with a VCR or a
second recording unit (e.g. cassette deck).
Control knob, SELECT and ENTER
The control knob has two functions:
as a volume control, to adjust the output of loudspeakers and headphones connected to the
amplifier, and of the pre-amp output (PRE OUT).
when used in conjunction with the SELECT and ENTER buttons, to customise amplifier settings
(see page 8).
Volume control settings
It is important to realise that the position of the Control knob is not an accurate indication of the power
delivered to your loudspeakers. The amplifier often delivers its full power before the volume control
reaches its maximum position, particularly when listening to heavily recorded compact discs. However
the amplifier also has to be capable of giving full power output from much lower level sources, such as
tuners and cassette decks. Using these sources, the volume control setting may be much higher before
distortion (audible overload) sets in. To compensate for this, the input levels of each source may be
individually adjusted to avoid accidental overload (see page 8).
SP1 and SP2
These buttons allow you to select and deselect the main (SP1) and secondary (SP2) set of speakers
attached to your amplifier.
The light above each button glows if the corresponding speakers are currently selected. If both lights are
out the amplifier will appear not to work, as all speakers are switched off!
This socket accepts headphones with an impedance rating between 8Ω and 2kΩ, fitted with a 1/4-inch
stereo jack plug. If you wish to listen on headphones only, use the SP1 and SP2 buttons (if necessary) to
mute the speakers. The headphone socket is always active.
Remote control receiver
The remote control’s infrared receiver is positioned between the SP1/SP2 and PROCESSOR indicator lights
on the left-hand side of the front panel window. Ensure the receiver is in a clear line of sight from the
remote control to allow signals to be received.