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Discussion in 'Amps and Cabs [BG]' started by AlexFeldman, Aug 22, 2005.
Can anyone post frequency response data for the vintage Ampeg B-15 cabinet?
I bet the response curve wouldn't sell a lot of amps these days. I'm guessing 3db down at 90hz and 20db down at 40hz. I'll be interested to see the actual measurements if someone has them.
I believe that some were made with ports. Mine, circa 1964, is not ported. If it's not ported, it would really depend on the driver installed. I believe in general that the B15-N really is heavy in the low midrange area, light below 80 hz, and, if it uses the CTS square-magnet driver, virtually nonexistent above about 1600 hz.
I have a '64 too. It's not ported in the strict sense of the term but is not sealed either. The baffle is "leaky". I'm a big fan of it's tone and have tried to replicate it with larger cabinets for more volume, albeit unsuccesfully. There is a string on that effort from a while back.
I'm trying to hit that low mid bump with my amp's EQ section (sweepable midrange). I'm working with an engineer to try and emulate the B15 cabinet with a 2x10. Maybe I should quit screwing around and just buy a real portaflex.
In my quest for B-15 tone I was told by the tone gods here on TB that the EA Whizzy cabinet was the way to go. I never got one because I need more volume than that. Even 2 whizzys would probably not be enough for me. So I've been playing around with EQ too. Not much luck so far. I had some success with a GK 400 RB with the low-mids boosted but my cabinets are the weak point. 4x10s don't seem to do it. I have a '64 B-15N for reference. Another idea would be a Mesa-Boogie D180 with their single 15". You might have to find one with the EQ. The cost of that rig would probably be as much as a B-15R but it would get louder. I never tried it though so it's just a guess.