I recently acquired a blown Ampeg B3158 amp. After I got the amp working, I discovered that both speakers were also blown. Reconing kits cost almost as much as some new speakers. So I'm wondering - what should I be looking for in replacement speakers for this amp/cabinet? Carvin sells their PS15 for $69 plus shipping. Any reason I should avoid this speaker? What freq range should I seek for the 8in driver? Is a full range speaker best for this? I've seen some "mid-range" 8" bass speakers that spec usable freq up to 5kHz, but the EQ sliders on the amp go all the way to 8kHz. Any advice would be appreciated. Thanks.