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6. ADVANCED FUNCTIONS
6.4. Front Channel input - bypass function
The Input labelled “Front Channel“ is coupled with a relay that bypasses the volume regulator. In the
“Front Channel” selector position the V 40 SE functions as a stereo amplifier. The bypass relay can
be disconnected internally if this function is not desirable.
The signal of the front channel input is not available on the record output.
6.5. Regulated preamplifier output – Pre-Out
6.5.1. Using with a subwoofer
The regulated preamplifier output is most commonly used to drive an active stereo
subwoofer. This must be equipped with its own volume control. The Pre-Out is decoupled via
a separate buffer to prevent the subwoofer from affecting the V 40 SE. The input impedance
of the subwoofer is therefore uncritical.
The Pre-Out does not have a separate muting function to prevent switch-on or switch-off noises from
the V 40 SE. This is not normally needed, however, since the active crossover in the subwoofer
electronics will block unwanted DC and low frequency signals.
6.5.2. Using the V 40 SE in bi amped systems
Another option provided by the adjustable Pre-Out is bi amping via the V 40 SE's internal
preamplifier. The V 40 SE would ideally handle the mid/high portion of a bi amped setup, using a
second power amplifier fitted with its own volume control to take care of the bass. In this
configuration, switch-on/off noises from the Pre-Out may prove to be a problem. The best way to
deal with this is to make sure you switch on first the V 40 SE next the external power amplifier and
when switching the units off in reverse order.
If you do not have a power amplifier with a separate volume control, you should match the input
sensitivities (or gain) of each amplifier. You will normally find the gain listed in dB in the amplifier's
specification. The figures for each power amplifier should be within 2 dB of each other.
The ideal gain of the external power amplifier is 24 dB +
/-2 dB.
Configuration of the V 40 SE in bi amped systems
Pre out
V
as
40SE
central
control unit
Speaker
to be
biamped
Power
amplifier with
its own
volume
control and
gain factor of
24 dB
Source
component
such as
CD player
