Distortion characteristics for Peerless paper & poly drivers - diyAudio
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Old 11th October 2008, 07:24 PM   #1
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Default Distortion characteristics for Peerless paper & poly drivers

Hi,

I purchased a pair of Peerless 5" drivers, 830860, for the purposes of constructing a small MT satellite for use with HT rig.

I've looked at some test data on Zaph's website for a similar driver with a Nomex cone (832873), where nice FR and distortion curves are shown. One can use this information to make informed decisions on crossover frequencies. However, to the best of my knowledge, similar data for the poly cone variant of this driver is non-existent.

So, what's a guy to do?

What I'd like to ask this group is given a particular distortion curve for a driver, what should I expect the distortion curve to look like (and the harmonic spectrum), if only the cone material is changed to polypropylene?

The other alternative is to find someone willing to test the driver, or go to the garage and spend some time building a test rig. The latter approach might require more talent to get right than what I possess.

Thanks.
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Old 12th October 2008, 05:07 PM   #2
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Default Re: Distortion characteristics for Peerless paper & poly drivers

Quote:
Originally posted by weinstro
Hi,

I purchased a pair of Peerless 5" drivers, 830860, for the purposes of constructing a small MT satellite for use with HT rig.

I've looked at some test data on Zaph's website for a similar driver with a Nomex cone (832873), where nice FR and distortion curves are shown. One can use this information to make informed decisions on crossover frequencies. However, to the best of my knowledge, similar data for the poly cone variant of this driver is non-existent.

So, what's a guy to do?

What I'd like to ask this group is given a particular distortion curve for a driver, what should I expect the distortion curve to look like (and the harmonic spectrum), if only the cone material is changed to polypropylene?

The other alternative is to find someone willing to test the driver, or go to the garage and spend some time building a test rig. The latter approach might require more talent to get right than what I possess.

Thanks.
I bet you can expect very similar performance. I don't own a pair of those, or I'd test them (I own Praxis). It's probably not worth the cost of two way shipping to figure it out either...but if you want...I can test....


I've tested the Peerless CSX range drivers, very linear, very good motor structure. The one problem I had with them is that they did NOT handle overload gracefully...they would survive, but the sound would go from pristine to eegads what was that...in a hurry.

Scott
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Old 14th October 2008, 01:55 AM   #3
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If you are talking about the current HDS lines, the main difference-other than the cone- is a better and better motor. Being at the bottom of the HDS line, I don't believe the poly cone drivers have any shielding/shorting rings in the motor. I would expect higher distortion than the Nomex series you seen at Zaph's site, and much more asymmetric impedance with excursion. OTOH I'd also expect a very smooth response.
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Old 14th October 2008, 03:12 AM   #4
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Quote:
Originally posted by augerpro
If you are talking about the current HDS lines, the main difference-other than the cone- is a better and better motor. Being at the bottom of the HDS line, I don't believe the poly cone drivers have any shielding/shorting rings in the motor. I would expect higher distortion than the Nomex series you seen at Zaph's site, and much more asymmetric impedance with excursion. OTOH I'd also expect a very smooth response.
As part of the HDS series, I believe they do have the shorting rings (as did the CSX drivers of old). Plus I cheated before I wrote the post and checked out Madisounds site plus the Tymphany site...



Scott
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Old 14th October 2008, 03:27 AM   #5
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Quote:
Originally posted by SpeakerScott


As part of the HDS series, I believe they do have the shorting rings (as did the CSX drivers of old). Plus I cheated before I wrote the post and checked out Madisounds site plus the Tymphany site...



Scott
Hmmm. The website descriptions are confusing. I've sent Tymphany an email requesting clarification. I was hoping that the only difference was the cone material.....crossing fingers.

Is there anyone nice enough to offer to run a distortion test?
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Old 14th October 2008, 03:59 AM   #6
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Quote:
Originally posted by SpeakerScott


As part of the HDS series, I believe they do have the shorting rings (as did the CSX drivers of old). Plus I cheated before I wrote the post and checked out Madisounds site plus the Tymphany site...



Scott
Yeah you may be right. The Tymphany info is confusing. I thought for sure the PPB drivers had higher inductance than the Nomex but looking at Tymphany's info they are both pretty low, with the PPB being a hair better. But the Nomex says shorting rings in the description so maybe you'll only see the difference with an impedance measurement at various excursions? The Exclusive mentions copper which I take to mean a copper plated pole piece, and if you have ever seen the Exclusive's impedance at xmax it's pretty clear that's what it is. So I dunno.
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Old 5th May 2009, 05:27 AM   #7
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I believe both the poly and the Nomex HDS drivers have Aluminum shorting rings, and, are quite low distortion. I prefer them over the "Exclusives". Both in appearance and for their smoother frequency response.

The 5.25" HDS can work in a very small cabinet, and the 6.5" ones should make very nice two way speakers, but in a larger cabinet - still, not so large compared to some other woofers...
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Old 2nd June 2009, 01:41 PM   #8
GWEE is offline GWEE  United States
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sorry for the jack but i tyed makeing a new thread, but it wont let me....

Hello all,
Im looking to build a pair of bookshelf speakers and would like to use Vifa XT25TG30-04 /Peerless Nomex 832873 because of the fact i have then already. Has this combo been done before, i would need help with x-o design. If theres specs for a x-o pleae post a link to it.

Thanks
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Old 4th June 2009, 06:37 AM   #9
GWEE is offline GWEE  United States
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have you seen this design http://www.troelsgravesen.dk/Peerless_HDS830860.htm seems it would be a nice bookshelf to build. but could you use the 832873 and keep the x-o the same?
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Old 8th June 2009, 10:37 PM   #10
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Quote:
Originally posted by GWEE
have you seen this design http://www.troelsgravesen.dk/Peerless_HDS830860.htm seems it would be a nice bookshelf to build. but could you use the 832873 and keep the x-o the same?

It should be decent. I suggest building it, and, if it doesn't sound quite right, you can always ask for some suggestions for tweaking the crossover.

I would build a pair of those and measure them, but I don't have either of those types of Vifa tweeters.

I have at least a dozen of the woofers [Nomex], I had been eyeing them for years, and jumped at the chance to get some cheap.

Oh, I happen to have a pair of the PP ones also. At some point I will build two pairs of speakers which are identical, except, one will have the Nomex and the other will have the PP woofers.
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