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Old 4th December 2007, 09:22 AM   #1
Did it Himself
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Default 2 inch Peerless vs 2 inch HiVi Research

I have been thinking about using a small fullrange driver to run from around 300Hz upwards in a couple of different projects.

HiVi Research have two offerings both very similar:

http://www.swanspeaker.com/product/htm/view.asp?id=121

http://www.swanspeaker.com/product/htm/view.asp?id=120

The only real downside I can see to these is that Qts is very high.

Now Peerless are in on the game with their new driver:

http://www.madisound.com/catalog/pro...oducts_id=8267

Anybody used any of these three drivers and can pass comment? They all look very similar in performance from the graphs. Maybe I will just go with the A2S because it will cosmetically match the Jordan's on the front setup, and they are available in the UK easily.
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Old 4th December 2007, 12:20 PM   #2
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From the specs the Tymphany driver looks like a better driver for an enclosure. Open Baffle might be better for the A2S but have you looked at the sensitivity ?
If I were you I'd pick the Tymphany .
Cheers.
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Old 4th December 2007, 12:31 PM   #3
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What leads you to that conclusion? The Qts value? I'm doing sealed chambers for the drivers.
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Old 4th December 2007, 12:54 PM   #4
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Honestly, I dont think any of them will be of much use at 300hz, you know, they should be able to play below the xo point
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Old 4th December 2007, 01:30 PM   #5
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Resonance is about 150Hz so what's wrong with a 300Hz crossover point?
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Old 4th December 2007, 01:49 PM   #6
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A sealed chamber will only raise the Q further . I wouldn't like that on the A2S. Open baffle might be OK.
I have just got some 4 inch drivers which I plan to use in an open baffle . The Qts is 1.47 !

If your bass driver is far away , 300Hz might be too high to crossover if you do not want imaging issues.
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Old 4th December 2007, 03:11 PM   #7
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Quote:
Originally posted by richie00boy
Resonance is about 150Hz so what's wrong with a 300Hz crossover point?

At very low SPL it may be ok
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Old 4th December 2007, 04:11 PM   #8
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I take the point about raising resonance with the box. I could probably move the XO point up a bit without much detriment. The bass driver will be in the same cabinet. I wonder if I need to use instead the HiVi 3 inch driver...
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Old 4th December 2007, 09:44 PM   #9
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I wonder if aperiodic vents would be helpful?
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Old 5th December 2007, 02:49 AM   #10
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Quote:
Originally posted by richie00boy
I wonder if I need to use ... 3 inch driver...
In his study of small drivers Zaph concluded that none of the drivers smaller than 3" were really worthy of consideration. http://www.zaphaudio.com/smalltest/

I recently fired up a set of the 3" Fostex FF85k (as per standard procedure around here, modified) on a test open baffle. Really quite excellent -- these could give a lot of more expensive tweeters a run for their money. I expect to get 100 Hz (althou at limited levels) out of them when i get them in a box.

dave
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