[quote name='gjones' timestamp='1351690858' post='1854201']
A local venue used to use an ashdown mag 600 through an ashdown mag 4x10 and the sound was pants (farting speakers). They changed the cab to a ampeg SVT classic 4x10 and now the sound is fantastic. So my advice is to get an ashdown amp but if you already have a decent ampeg 6x10 stick with it and see if you like the sound before you spend money on an ashdown 4x10 because an ashdown amp and ampeg speakers are a good combination.
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I had the exact opposit experience - to my ears, Ashdown amps really don't sit well with Ampeg cabs. They make the sound a lot duller, a lot less top end. Mind you, that might be the sound you're after - I was going for the full-on, Entwistle treble and grind tone so it didn't meet my needs.
I owned both the ABM 8x10 and 4x10 - same basic sound from both, although the 8x10 has that irresistable advantage of being higher so is much easier to hear and feel during a gig.