Seas Millenium Tweeter F3 Distortion - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

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
Reply
 
Thread Tools Search this Thread
Old 28th August 2008, 07:10 PM   #1
diyAudio Member
 
Join Date: Jan 2007
Default Seas Millenium Tweeter F3 Distortion

I've been doing some harmonic distortion testing of my Seas T25CF002 Millenium tweeters and I'm seeing highish 3rd order distortion (F3) from the both the Milleniums. In fact, the F3 distortion is significantly higher than the F2 distortion unless I turn up the volume very loud (I'm have not calibrated levels so I can't give a quantitative number for the signal level). I'm seeing F3 levels at -45 dB (0.6%) or so off the fundamental for frequenies between 3 and 6 kHz. F2 is about 5-10 dB lower.

I also have a pair of TBFC/G tweeters on hand and their F3 distortion is significantly better. Their F3 is always lower than F2 as expected.

I installed new voice coils on the Milleniums but it didn't really help much. When I opened up the tweeters to switch out the voice coils, I noticed that there's a felt pad with a foam cylinder glued to it. This fits in the area inside the voice coil between the area behind the dome and the rear chamber. The piece was out of place on one of the units, which I believe had lower distortion before I fixed it's position and replaced it's voice coil.

I'm kind of baffled as to what could be wrong, or maybe they're operating normally. I don't see this high F3 in Zaph's distortion data though.

Any ideas?

Thanks,
Jim
  Reply With Quote

Reply


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
Distortion SEAS MCA12RC knorke Multi-Way 0 30th August 2007 05:13 AM
For Sale: Seas Millenium Tweeters! Mike_Paschetto Swap Meet 0 10th March 2007 05:05 AM
Seas Millenium tweeters and Seas W22EX-001 sephiroth619 Swap Meet 2 5th March 2007 07:34 AM
Tweeter comparison Sea Millenium and Hiq OW or Morel Supreme? fredness Multi-Way 13 5th February 2005 09:19 AM
Anybody know the T-S parameters for the Seas Millenium tweeter? 454Casull Multi-Way 7 29th June 2004 07:05 PM


New To Site? Need Help?

All times are GMT. The time now is 09:54 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2