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Amps with massive low end

My understanding is that the early SWRs were designed with the advent of 5 and 6 string basses in mind and were thus flat to 10hz, if memory serves. I've played a Modulus neck through into a very large PA that went down very low with a Groove Tubes Studio Bass Preamp (same circuit) and it was a beautiful thing. However in 99% of the circumstances, HPF solves the issues. It's a pretty cool design, with that in mind.
I don't think it's that low, somewhere around 20Hz with a 6dB/octave rolloff is what I recall.
 
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The old SWR heads had too much deep low end to be usable, many GK heads (e.g. MB-800) and Mesa Carbines are very strong and big in the low end in much the same way to my ear, and the Aguilar DB750/751 heads have incredibly massive low end capability.

IME the Mesa SW 800 series heads can generate some pretty impressive lows when hooked up to the right cab(s). The difference between the SW heads and the ones I listed above is that the low end from these amps is much more controllable and shapeable.

+1 with Al.

Of the amp/heads I've owned over the years, the two that stands out to my hearing as being capable of a "massive lowend", Mesa M-6 Carbines (with the bass boost on), and my present gigging head, G.K. MB Fusion 800 (also with the bass boost on).

I like the bass boost on with the Fusion 800 but in the past year I've incorporated a Broughton "Always On" HPF to help to control those lows.
 
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It's not a display unit, but a real thing. Custom built for a Van Halen tour sometime in the '80s. Cabinet is 32x10". The amp itself...can't really recall but it's a monster.

If I'm not mistaken it's currently owned by a TB member @bobyoung53
:laugh: It was built for a Monsters of Rock tour with Van Halen involved but I can't remember which band was supposed to use it, I know they argued over it and it wasn't used. They made several of those actually. The one above is the 36 speaker cab, they made both a 32 and a 36. The head is basically two 300 watt SVT's combined for 600 watts.