Radial Engineering Ltd.
Headbone User Guide
True to the Music
7
guitar signal switching with a series of opto-couplers under digital control.
These opto-couplers are made to ramp-up and ramp-down the guitar
signal in such a way as to avoid any clicks or pops from the mechanical
footswitch. The digital controller is programed to perform this cross-fade
over a few miliseconds making it impossible to hear while effectively
eliminating noise.
Switching Speaker Signals
To accomplish this task, the PIC sends a status change command to a
series of internal relays that connect the speaker to the active amp, and
connect the load resistor to the standby amp. Always use good quality,
large conductor speaker cable between the Headbone, your amps and
your speaker cabinet, as this will reduce signal loss and improve the
transient response. Your Headbone has been designed to work with
amps whose maximum output is 100-watts RMS. The power is limited
by the relay that is used to switch the speaker signals. To be safe, never
exceed this power limit.
Effects such as echo or loop-playing devices,
MUST BE
CONNECTED BEFORE
the Headbone so that their residual
or sustaining sound can be disconnected from the input of
the amplifiers. This means that you cannot use any type of
echo device that prolongs a signal on the amplifier’s effects
loop or after the Headbone in your signal chain. Failure to
do so could cause the echo to continue to play through the
standby amp which, in turn, would continue to amplify the
signal without a load. This could cause the amp or the Head-
bone to malfunction. The Headbone’s internal resistor load
is only designed to support the standby amplifiers residual
output. The Headbone is NOT a load box.
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