T/S Measurements, Nomex vs. Poly - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 30th December 2006, 01:34 AM   #1
ch83575 is offline ch83575  United States
diyAudio Member
Join Date: Jan 2005
Location: Michigan
Default T/S Measurements, Nomex vs. Poly

Ok, I have measured these drivers (Peerless 6.5" HDS Poly & Nomex cones) a few times now, both with an 8ohm resistor and 330ohm resistor and I get measurements that are pretty close to spec (at least for the Nomex), but not very close to each other (not close enough for me to be confident that is, specificaly the VAS). I dont understand how for each driver the constant current technique would produce different results than and 8ohm resistor. I have repeated the measurement process with each technique and each result is repeatable, but not matching. My question is which should I use? Am I worried about differences that are not very big on the grand scheme? I am doing these at low levels, with broken in drivers and using the added mass technique.

Here is the two techniques for the Nomex:

8 ohm resistor:
Click the image to open in full size.

constant current:
Click the image to open in full size.

And here are the measurements for the Poly cone:

8 ohm resistor
Click the image to open in full size.

constant current
Click the image to open in full size.

The other thing that I am worried about is the Poly cone is pretty far from the spec. It would not normaly bother me, but Peerless seems to think they are almost identical, and I get results that are pretty different for the two cone materials. Has anybody else had this experience? Should I suspect my measurements, or do the look reasonable?

Thanks in advance,
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
North Creek D28 + Peerless Hds-164 Nomex Klimon Multi-Way 23 11th May 2008 10:21 AM
HDS nomex 205 testarossa2k Multi-Way 0 28th August 2007 02:58 PM
Peerless HDS Nomex bjackson Multi-Way 1 7th February 2006 02:26 AM
Bass/mid drivers - Peerless or SEAS? Nomex? Jorge Multi-Way 8 19th November 2005 09:44 AM
Peerless 830875 Nomex????? Gavinator68 Multi-Way 2 8th November 2005 01:55 AM

New To Site? Need Help?

All times are GMT. The time now is 09:57 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2