©
Thermionic Culture Ltd August 2014
8
3.6 Top
Cut
The 3 position top cut switch gives 2 choices of filter at
high frequencies:-
Position 1 gives a flat response with no filter in circuit.
Position 2 gives a low pass filter 6dB down at 8 kHz
Position 3 gives a shelving type cut flattening out 8dB
down at 8 kHz
3.7 Phase
The phase switch is a 2 position switch and allows the
user to change the phase of the channel signal by
180º
3.8 Bass
Cut
The bass cut switch is a 3 position switch which gives
2 choices of shelving filter at low frequencies. The
shelving filters are shallow types of bass cut and are
designed to interact with the bass lift to make a
simultaneous low mid cut and low bass lift possible.
Position 1 gives a flat response
Position 2 gives a shelving filter with a 3dB cut at
200Hz down to 7dB at 80 Hz
Position 3 gives a shelving fliter with a 3dB cut at
800Hz down to 6dB at 200Hz.
3.9 HPF
The high pass filter switch gives the user a filter which
is 6dB down at either 30Hz or 80Hz and becomes
more severe as the frequency drops.
These frequencies and filter slope work very well in
conjunction with the Bass control. Effectively allowing
the user to simply remove problem frequencies from a
sound or to allow the bass frequencies to be
dramatically enhanced without any danger of
