'77 Marshall Super Bass full blast Vs Attenuation with Hotplate 16 and Weber Mass 100. '72 Marshall 1982A Speaker Cab and '08 Gibson Les Paul R9. Attenuators ran with all compensatory features bypassed exept for the Hotplates Bulb function on all but bedroom volume. If you wanna get an idea about SPLs check out this clip:
https://www.youtube.com/watch?v=vGfMaUKwy_o
Settinds on the Super Bass: Lead Vol: 8, Presc: 9, Bass: 3,
Mid: 9, Treble: 8