If you own one of these Ampeg PB210H enclosures and can no longer get blown drivers replaced because they're out of warranty, I have a suggestion...
Replace them with Eminence Legend BP102 drivers. You can buy them almost anywhere for about $75.
Eminence Customer Service was very helpful and provided me with porting information. The PB210H needs two ports with a inside diameter of 2 7/8" by 3 7/8" long.
I got my ports from partsexpress.com The ones that I purchased are listed as 2 7/8" X 5". You'll need to cut them down carfully because they're slightly tapered. I cut mine on a table saw with a crosscut jig, using shims to hold them square to the blade.
If you're not handy with a table saw, I'd suggest placing masking tape on them and drawing your cut line on the tape. Then cut them with a hack saw.
Due to the fact that they were tapered, and the I.D. is actually 2 3/4" and not 2 7/8" at the baffle and approximately 2 5/8" at the cut end I reduced the length of the port to 3" even.
The port length for a 2 3/4" I.D. was 3 3/8". The port length got shortened 3/8" for every 1/8" less of inside diameter. This is how I arrived at the 3" port length.
The holes for the ports can go in the upper and lower corners on the same side of the baffle as the tweeter. A 3" hole saw works fine. Be carful to locate exactly where the hole is drilled; there's not much room to spare. These ports barely fit. Glue them in place.
The enclosure/speakers now handle 350 watts as compared to about 200 watts with the enclosure not ported.
Also, the enclosure is now tuned to 50Hz with these ports as compared to about 70Hz without porting it.
F3 = 52Hz.
The above specifications came from Eminence based on precise enclosure volume calculations that I gave to them.
I don't believe that Ampeg's specifications for frequency range or power handling were ever very accurate. The enclosure does still sound good though, as long as you don't need to get too loud. I use mine with a Mesa Walkabout. It's no surprise that the Ampeg PB250 head was only 250 watts.
The enclosure still has it's punchy tone, but now has more bottom end. It sounds great! I'm sure that these drivers will be much more reliable than the OEM drivers as well.
Replace them with Eminence Legend BP102 drivers. You can buy them almost anywhere for about $75.
Eminence Customer Service was very helpful and provided me with porting information. The PB210H needs two ports with a inside diameter of 2 7/8" by 3 7/8" long.
I got my ports from partsexpress.com The ones that I purchased are listed as 2 7/8" X 5". You'll need to cut them down carfully because they're slightly tapered. I cut mine on a table saw with a crosscut jig, using shims to hold them square to the blade.
If you're not handy with a table saw, I'd suggest placing masking tape on them and drawing your cut line on the tape. Then cut them with a hack saw.
Due to the fact that they were tapered, and the I.D. is actually 2 3/4" and not 2 7/8" at the baffle and approximately 2 5/8" at the cut end I reduced the length of the port to 3" even.
The port length for a 2 3/4" I.D. was 3 3/8". The port length got shortened 3/8" for every 1/8" less of inside diameter. This is how I arrived at the 3" port length.
The holes for the ports can go in the upper and lower corners on the same side of the baffle as the tweeter. A 3" hole saw works fine. Be carful to locate exactly where the hole is drilled; there's not much room to spare. These ports barely fit. Glue them in place.
The enclosure/speakers now handle 350 watts as compared to about 200 watts with the enclosure not ported.
Also, the enclosure is now tuned to 50Hz with these ports as compared to about 70Hz without porting it.
F3 = 52Hz.
The above specifications came from Eminence based on precise enclosure volume calculations that I gave to them.
I don't believe that Ampeg's specifications for frequency range or power handling were ever very accurate. The enclosure does still sound good though, as long as you don't need to get too loud. I use mine with a Mesa Walkabout. It's no surprise that the Ampeg PB250 head was only 250 watts.
The enclosure still has it's punchy tone, but now has more bottom end. It sounds great! I'm sure that these drivers will be much more reliable than the OEM drivers as well.
