I've posted this in a couple of places as the searches don't come up with much (other than my old thread to recommend amps for my Ampeg V4!).
Thanks to Mr voodoobass for talking it up and making me aware that it existed(!), and thanks to all the tube amp guys for the supporting anecdotes in favour of sealed cabs.
Bit of background: I bought an old Ampeg V4 head a while back and a Trace cab (with a 15" and a 10" EV speakers) which just didn't work out, it farted out a fair bit and I think a ported cab doesn't really suit the head.
As for the Marshall - Fantastic tight low end and fat low mids, no harsh treble (no tweeter) so a pretty 'old school' sound but still plenty of twang, particularly when playing with a pick. It seems to be very responsive, never sounds flabby or farts out regardless of whether you have the low end boosted or mids to silly levels. I just can't believe the volume of the thing, it's almost as if it was challenging you to stretch it and then saying 'nyahhh, you **** - not enough power'
This rig is an awesome metal/hardcore set-up. Wheels on the bottom are a definite bonus, as is the shallow depth and extra width to put the V4 on top without looking ridiculous. Nice recessed jack socket too.
There are some carp things about it:
1. It's a marshall 4x12 so it looks like a guitar cab (an old guitar head on top doesn't help the issue ).
2. It's a marshall cab so the tolex covering is utter s**t and rips if you cough near it.
3. If carrying on your own through doors etc. you need to work on your sideways crab walk due to its considerable width.
4. It looks like a guitar cab
All in all a superb purchase which has increased my confidence in sealed cabs considerably. Sounded nice with guitar too, nice soft smooth thick vintage sound (helps going through the V4 with a touch of reverb).
A bargain used at Ģ220 ($375 at current rates), or to translate into real UK gear price terms - 1/4 the cost of a new Ampeg 810.