If the thing is to get a 4x10 that will truly handle low end, the Carvin BRX 10.4 Neo is going to serve your needs much better than the BR 410:
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Now on sale for only $50 more than the Avatar B410 with Line-X. And it rules!
MM
I just bought one. Handles the low B really well. I've been playing two 1x15 cabs so I wasn't particularly looking for a 4x10. I was initially looking at a 1x15/2x10 stack but like the BRX better by itself. I still might add a 1x15 or 1x18 though.
I A/Bed the BRX and their other 4x10 and the BRX was the clear winner in terms of handling the low B and having much more punch with the same amp settings (I believe other one is sealed and smaller in size, so that's probably why).
