Serious question about DEEP switch operation on Bassman amps...

[KenB]

I just posted a discussion about the operation of the DEEP switch on my Bassman 135 amplifier. I was able to confirm that the switch operates OPPOSITE to what I would expect. That is, when the switch is in the UP position there is a definite CUT in the lows (about -5dB for all frequencies below 500Hz).

See the thread here:
Bassman 135 Deep Switch - What were they thinking? (Nerd content...)

Now I am wondering about the operation of the DEEP switch in other Bassman amps, both vintage and newer models.

Any comments or observations welcome...

Thanks!!

 

[hennessybass]

I find the B & T controls a lot more useful with the Deep switch on (in the up position).
If the tone stack is flat 0-0, the deep switch does not sound great. All the lows, and highs go away.
But, if you start adding back in B & T ,with the deep switch on, the sound really starts to come alive.

I think when you hit the deep switch and boost the bass and treble, it sounds like to me some very nicely placed scoops that just make the right frequencies stand out, and the tone come alive.
I usually start with 0-0, deep switch up, then dial in the bass until I like the low end for the room, then bring the treble up until I get enough to be articulate and slot into the mix.