Unexpected T/S Parameters-Vintage Oxford 15" Drivers - Page 2 - diyAudio
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Old 13th November 2010, 03:14 AM   #11
godfrey is offline godfrey  South Africa
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Maybe the magnet's lost some strength over the years? A stronger magnet would bring down the Qts and give (even!) higher sensitivity. Less stiff surround would lower the Qts and Fs.

Since you like the sound, maybe it's best to leave well enough alone though. As is, they might be best on an open baffle. That high Q will give a nice lift at the bottom end. Any idea what kind of enclosure was originally used?
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Old 13th November 2010, 03:30 AM   #12
Kilroy is offline Kilroy  United States
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Quote:
Originally Posted by godfrey View Post
Maybe the magnet's lost some strength over the years? A stronger magnet would bring down the Qts and give (even!) higher sensitivity. Less stiff surround would lower the Qts and Fs.

Since you like the sound, maybe it's best to leave well enough alone though. As is, they might be best on an open baffle. That high Q will give a nice lift at the bottom end. Any idea what kind of enclosure was originally used?
I agree on the magnets. I bet they have lost something.
The sound is very warm and clear... But they need help on the top end. Which is probably why they were coupled with the horns.

They are very sensitive, surprisingly loud, and very directional in free air.

No idea on the enclosure but I have the grills which were identical but separate for the horn and the 15".
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Old 15th November 2010, 04:21 PM   #13
Kilroy is offline Kilroy  United States
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Default OB it is, I guess

I've been puttering around the internet trying different calculators and modelers and it certainly looks like Godfrey's OB suggestion is really the best suited 'enclosure' for these parameters...

I gotta admit, I'm a little intimidated by the idea of trying to make that sound good. I get boxes... Dipole is kind of new to me but I'm ready to start tweaking a board for sound.

But from what I hear from the speakers, what I see in the other OB threads, and what I've read elsewhere, these old Oxfords are probably best suited for use as a wide rang mid speaker in a 3-Way OB.

Listening to them just sitting by themselves gave me the impression that they sounded surprisingly musical for a big speaker but also had surprisingly little deep bass... And it seems the Arta reinforces that impression.

When doing a 'stepped sine' in Arta, they seem to start to come on around 50Hz... Would it be silly to cross a sub that low?

Judging from the Impedance sweeps attached, do you think I'm on the right track?

Also, I'm wondering if the horn tweet that was originally matched to the woofers, is the right accompaniment for them? I've attached the graph for it as well... Does that tell me anything or do I need to mic the pair?
Attached Images
File Type: jpg OxSPK_145-1.jpg (46.4 KB, 37 views)
File Type: jpg OxSPK_145tweet-1.jpg (104.5 KB, 37 views)
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Last edited by Kilroy; 15th November 2010 at 04:24 PM.
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