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Trade Off Between Midrange Purity And High Frequency Performance In Compression Drivers

Posted by ka7niq (A) on May 24, 2007 at 22:44:35

I have been playing with the 2 pairs of Frazier Dixielander Speakers I was fortunate to find here locally in Tampa.

These speakers have a wonderful midrange, w/o squak, harshness, or honk.
However, they are rolled off in comparison with almost every other speaker I have heard.

I called Frazier Speakers in Texas.
They are not the same company as they once were.

There has been several new owners.

I asked the new owner what compression driver was used, thinking it was an Altec.

It turns out is is an Atlas SA 333 phenolic diaphragm driver that was specially made by Atlas way back when to Jack Fraziers specs.

I talked to an old Atlas engineer who actually remembered what Jack was trying to do with this driver.

Since my Dixielanders came out of a movie theatre, the engineer told me that Jack Frazier was very concerned with midrange performance.

He felt the phenolic diaphragm Atlas driver had better midrange performance in his set up, and decided to go with it.

I have been told that metal diaphragms have better top end, and was thinking of screwing a pair onto my horns.

But, the Atlas engineer told me it was a trade off, and told me he doubted I would equal the lower mid range performance of the custom phenolic compression driver they made for Jack Frazier.

He told me that Frazier "drove them nuts" years ago trying several different compression driver variations until he got "his sound".

Any thoughts ?

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