Thanks! Yea the "black sound" sounds even better when you're in the room with the amp and both cabinets are on. Its just incredible. I think that sound is basically the "Hyper Clean" channel from the Mark IV.
Here's my Harmony Central review of the Peavey 50/50:
Features : 10
I'll just mention the features that make this amp special:
- Presence and Resonance knobs on the front for EQ'ing
- Separate standby switches for each side
- Two inputs for each side and two speaker outputs for each side
- Can be run in Mono mode @ 100 watts if only using one cabinet
Sound Quality : 10
Other power amps that I have owned are a Peavey Classic 120, Mesa 2:90, Mesa 50/50, and a Mesa 20/20. I went through all those trying to find the best match for my Mesa Boogie Studio Preamp, and ended up going back to the Peavey 50/50 two months after selling it.
This is one of the greatest power amps ever made. It combines the gnarly tone of EL84's with the headroom of 50 or 100 watts. Clean sounds are angelic, and overdriven tones are crispy. Its tone that you'll want to sink your teeth into. Pinch harmonics and feedback on this thing are amazing. This power amp especially favors the Mid-range sliders on my preamp's 5-band EQ. When you crank the Low-Mid and Mid sliders on the EQ (240 Hz and 750 Hz respectively) you get an incredibly gnarly (there's that word again) woody, boxy, warm resonance that no other of those power amps could match.
It also provides a good low-end for high-gain power chord chugging. If you crank the bass on your preamp and scoop the mids this power amp responds well and will give you a great CHUNK.
Reliability : 10
Mine was DROPPED by the douches at UPS and it bent the front handles in permanently, but its been working perfectly.