I have also run a bass guitar through the Twin and the tone is excellent

Loud as heck, great metal/hard rock tones, low end is fat.

Nice articulate tone, with tight lows that don't get muddy, round sounding mids, and nice crisp highs

but I would definitely not say the tone is darker.

Clean and distorted tones using high wattage tube amps are impressive (using a Mesa Boogie 150 watt triple rec)

Whether playing clean, crunchy or with high gain they really deliver a wonderful tone

Loud as heck, great metal/hard rock tones, low end is fat.

Amazing warm tone

Fat full bodied tone, if that what your looking for