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[Thomas W. Bethel]

Mrwoo wrote on Wed, 27 October 2010 18:18

Hey Thomas,with your knowledge of acoustics,how do you think this switch over will fair? I found a match that's almost the same,but it goes lower.I think to 18Hz.I believe this is what I am looking for.Thanks for the info.

As others have pointed out this will not be a direct replacement but it is up to you and your ears to decide if this is the same, better or worse than the original. We just had the speaker surrounds in our ALON's repaired. The company that did it was GREAT but they used a non Alon approved foam surrounds. (FWIW to get Alon, now called Nola to do the rework would have cost me $300 for each speaker. The person did the rework for all four speakers for that amount) To my ears, and I trust my ears, the newly re-annulus speakers sound BETTER than the originals. Only you will know how much better or worse these speakers sound after the replacement.

Best of Luck!

[Mrwoo]

Thanks Thomas and Brad for your input...I found all the speakers that are from the original manufacturers.The volt loudspeaker company makes that woofer for them.I was just wondering if the sound scan woofer would really be of lesser quality?I know that only by testing it would I really know.I am hoping that the replacements that I choose surpasses the quality of the previous driver.That will help me if I end up in this situation again.Once again I thank you all for your wonderful input......Now if I could get some info from guys who build speakers professionally,that would be the icing on the cake.

[Garrett H]

I have had phenomenally good experiences with the gang at Madisound.  So, if you can't get PMC to respond, those guys at Madisound are going to do their best to get you moving in the right direction.  

Just another wrinkle.  Sometimes companies make a driver for a speaker at one point in time, but make changes to the design over the years.  You go back to purchase a replacement, and their could have been changes you didn't know about.  This is why its unfortunate that PMC isn't speaking up -- they would be on top of developments.

Nonetheless, I wish you good luck as this is very important to your monitoring chain...  Now you see why many of us have stockpiles of drivers hidden away.

Best,
Garrett

[Mrwoo]

Thank you Garrett for your response...I am going to test and find out what the best option is.The guy at madisound was very helpful,and assured me he was going to do the best he could, to help me resolve this issue.When I find the best driver it will be stock up time.....Thanks everyone....The guys here are very helpful on this forum.

[Burnett]

I just want to add, that you very likely can't replace that woofer with something off the shelf (either vifa scan speak or volt).

The woofer for IB1 and IB2 was an design by a company called "Precision Power" (well-known for car audio) and the driver was called PPI10 (or something like that). PMC used that driver in the beginning but later on they bought the rights/patents of this design and outsourced the manufacturing to Volt (also responsible for the midrange in the IB2 and the models above that).

Madisound and all driver resellers won't be able to get you this driver. And afaik there is nothing comparable to this driver except an old one from Precision Power (but parameters could have been changed slightly over time).

Edit: you can't use a different driver unless it's paramters are nearly equivalent to the PMC one (read: normaly this doesn't happen anytime). To use eg something from Scan Speak, you would have to modify the whole crossover circuit.

[Mrwoo]

Thank you for the information.

[Bob Olhsson]

There can be pretty big variations from unit to unit in drivers. I can almost guarantee that the Vifa drivers are measured and carefully matched to the crossover design.

That's a lot of what you are paying for in top quality speakers and why a replacement driver isn't likely to be cheap.

[Mrwoo]

Well Bob,I wouldn't have thought that a single driver would cost that much...I could almost replace one of my TB2sa monitors at that price..

[Mrwoo]

Lynn Fuston has gotten a pair of Lipinski 505s for $1850.00.That Woofer pricing would almost cover the price of those.Hey,hey.

[bblackwood]

Mrwoo wrote on Sat, 13 November 2010 22:17

Well Bob,I wouldn't have thought that a single driver would cost that much...I could almost replace one of my TB2sa monitors at that price..

Supply and demand.