Introduction
The 400T is a transistor amplifier with a continues power of 400 Watts. The 2
inputs have separate gain controls. The led above input 1 is a clip indicator
which turns from green into red as soon as the input signal is too high. If so,
one should reduce the input signal by lowering the volume of the instrument or
the input gain at the amplifier.
Input 1 has a –6dB switch to reduce sensibility if necessary. This could be the
case by using an active bass guitar or double bass with separate pre-amp. If the
clip indicator turns into red often, one should put the switch to –6 dB. The –6
dB switch is also useful to connect both an active and passive bass at the same
time. If both basses have a similar output, the switch should be set to 0 dB.
Input 1 is provided with a phase turn switch, which can be useful connecting a
double bass with two different pick ups. By means of the switch one puts one
pick up out of phase, resulting in a different sound.
The pre amp is also equipped with a Mute Out to tune the instrument
soundlessly. By means of the Mute Out switch one can activate the Mute Out.
The internal signal is then interrupted and will be available at the Mute Out to
be sent to a tuning gear.
The tone control unit is a 4-band type and is very easy to use. The frequencies
are 80, 250, 800 and 2500 Hz , +/- 12 dB. The amplifier has been built in such a
way that in normal acoustic circumstances there will be no need to use the
tone control.
At the back are a Loudspeaker output, a Headphone output and a symmetrical
Line Out with pre/post switch. The pre/post switch controls the point in the
amplifier circuit where the line out signal comes from. Pre comes just behind
the input and is not controlled by gain nor tone control, post comes behind the
tone control. Never connect the Line Out to a mixing desk with Phantom Power
switched on! This can cause amplifier malfunction or even damage.
The loudspeaker output has a minimal load of 4 Ohms. Built in a combo one
can connect an extra loudspeaker cabinet of 8 Ohms. Together with the
internal loudspeaker of 8 Ohms one has a total load of 4 Ohms, forcing the
power amp to give its maximal power of 400 Watts. The headphone can be
controlled by means of the gain and master knob.
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