Apologies for the long post- but it's on point.
Recently, I purchased a MINT used PF-500 head and PF 210 HE from a local player. Before my appointment with him to try the amp out, I went to my local Guitar Center. They have the same combo on the floor there. I also know most of the people there, so, I can be a jerk with volume! lol!... so, I brought my GB Shuttle 9.0, and problematic but promising Carvin BRX 210 down to test it, and the Ampeg portaflex for comparison. Well, the Carvin cab had a defect- turned out to be the Carvin neo drivers. Rattle, buzz, and back to the drawing board kinda stuff. The test moved on to the PF stack. PF 500, 210 HE cab. It was beyond disappointing, it was surprising. ALL the notes on a Squier, and a PRS 4 string bass, from 'A' down on the 'E' string made the cabinet sound horrible. My 5 string (in my Avatar) with Alembic pickups was a torture treatment for it... ugh. As if it were afflicted with emphysema. Farting, a weird doppler wolf tone effect. I wrote it off to a worn, or abused floor model speaker. But in the back of my mind, I suspected something was amiss.
NOW, it gets really interesting. I really dig the PF500.. in spite of all the bad press, I really like its' features, and I do keep an open mind. But bad sound, especially for us bassists, is unacceptable, regardless of the fact that I'm from Woodside, Queens, New York City, the original home of Ampeg. And, as such, and as a Queens wise ass, I speak my mind- the truth is the truth, even if it sucks to hear it.
I played a stock 4 string MIJ P-bass through the rig at the seller's house. And, it sounded IDENTICAL to the demo model at GC. NO low frequency handling capability at all on the low notes. To me, ah, isn't that what we buy bass amps for? So all the notes will be clean, clear, and not sound like someone turned a low frequency faucet off after 'A' down on the 'E' string? I bought the rig anyway, it was a GREAT deal. So, after some chat here, and a truly miraculous revelation- That I have an unused old 4-10 Avatar cabinet with the original Eminence 410 NEO 300 watt 8 ohm 2510lf drivers in it- That I could fix two issues at the same time. I installed two of them in the Carvin BRX 10.2, PROBLEM SOLVED.
Then, I installed the remaining two in the Ampeg PF 210 HE. PROBLEM SOLVED!
The issue? Beautiful looking, but crappy factory drivers, that cannot handle low frequencies- or aren't matched to the cabinet! That is where these manufacturers are cutting costs. Now, my PF combo has two Avatar 8 ohm Eminence 2510lf Deltalites, 300 watt in parallel- so 500 watts at 4 ohms, into these drivers that are rated for 600. Killer, now, I just need to port the cab. Or, maybe not?
P.S., I have a mint first generation Acoustic B-200 combo. I recently compared the now 200 dollars more expensive unit to EVERY other combo at GC, and it still kicks all their asses! A great amp. And, even with the PF mods- it will be hard for it to keep up with the Acoustic.