Re: Marshall DSL100
I own its little brother, the DSL50.
Two channels, each with two stages.
“Classic Gain” offers clean and crunch modes (modes are not footswitchable). The cleans are very usable so long as you aren’t looking for Fenderish clean tones. The crunch channel is a moderate 70s British type crunch that reacts well to pedals. The crunch mode doesn’t really start to cook until the volume is way up.
“Ultra Gain” is a more modern, yet still Marshall, sound. The modes are Lead 1 and Lead 2. Personally I find the Lead 2 to be too high gain for my tastes and very buzzy. Lead 1 is just right (it’s a higher gain, beefier version of the crunch channel). The nice thing is that I can still get pretty good tone out of the ultra gain channel without cranking the volume (although, “5” is still pretty loud for a 50 watt Marshall).
There is a deep switch and a tone shift. The deep switch is basically a bass boost that really fills in the bottom end. Use carefully because it can also loosen up the low end. The tone shift is not a mid boost, but rather a mid-cut. In the “in” position it scoops the mids quite a bit.
I’ve used it with a cheap 4x12 Fender cab and a 2x12 loaded with a pair of Celestion Greenbacks. While I prefer the overall tone of the 2x12 over the 4x12, the 4x12 certainly filled a space better.
Unless you need the headroom for the clean channel, I’d recommend the DSL50 over the DSL100. The gain channels break up much sooner, and 50 watts should be enough power to play just about anywhere you would play without a PA system.