help with driver specs - Page 2 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 20th April 2006, 09:29 AM   #11
simon5 is offline simon5  Canada
diyAudio Member
 
Join Date: Nov 2004
Location: Québec, Québec
If your tweeter is an aluminium or titanium diaphragm, you could be hearing tweeter resonance.

What speakers are you using?

Also, the Audigy 2 is also a very poor performer that high in frequency. I don't know if SweepGen output in 44.1 kHz or 48 kHz. 48 kHz causes less problems that high in frequency with an Audigy 2.

The Creative X-Fi line corrected the problem with a beefy hardware resampling algorithm.

M-Audio Revolution line doesn't have this problem.
__________________
DIYaudio for President !
  Reply With Quote
Old 20th April 2006, 01:17 PM   #12
diyAudio Member
 
Join Date: Mar 2004
Location: Athens
Hi,
My tweeters are silk domes, Audio Pro Avantek Six Floorstanders...
But Audigy 2 was measured in some beanchmarks nearly flat till 19.5khz...Being -6db in 20khz doesn't mean it can buzz, right?
Anyway, I will try different cards and see...
  Reply With Quote
Old 21st April 2006, 01:41 PM   #13
simon5 is offline simon5  Canada
diyAudio Member
 
Join Date: Nov 2004
Location: Québec, Québec
Silk domes are supposed to be very "smooth" that high usually...

Yeah at -6 dB it should be less loud... trying another soundcard is probably the best idea. Try an X-Fi or a M-Audio Revolution...

Most soundcards have problems that high, except high-end soundcards.
__________________
DIYaudio for President !
  Reply With Quote
Old 21st April 2006, 01:56 PM   #14
diyAudio Member
 
Join Date: Mar 2004
Location: Athens
I found what will I do!
I will make a wav file with 20Hz and burn a cd. Then I will play it through Audigy 2/PC and then through my separate sony cs-player, to find out what is going on!
Thanks for the help though
  Reply With Quote
Old 21st April 2006, 01:58 PM   #15
simon5 is offline simon5  Canada
diyAudio Member
 
Join Date: Nov 2004
Location: Québec, Québec
Then try the same 20 kHz wav file, but record it at 48 kHz if you can and play it on your Audigy 2.

Audigy 2 is way better at 48 kHz than 44.1 kHz.

Good luck!
__________________
DIYaudio for President !
  Reply With Quote
Old 21st April 2006, 02:07 PM   #16
diyAudio Member
 
Join Date: Mar 2004
Location: Athens
Thanks for the advice!

I also have another question about Fs. Experienced people say that it is the point where driver impendance is maximum

I have noticed that its true with most drives, but I found out that it's not the case with this Excel woofer: http://www.seas.no/excel_line/excel/E0017.PDF

The impedance peak is at 60hz while the Free air resonance at 31Hz

What is wrong?
  Reply With Quote
Old 21st April 2006, 02:15 PM   #17
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
From the seas datasheet at top of graph:

The loudspeaker is mounted in a closed box of 12 l net. volume

So obviously resonance will be shifted up somewhat.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 21st April 2006, 02:33 PM   #18
diyAudio Member
 
Join Date: Mar 2004
Location: Athens
Hm!
Well, Seas seems to be a little different compared to other companies that measure their drivers in free air, isn't it?
Does these measurements help a loudspeaker designer? I mean which one is preferable? (cabinet measuring or free air)

Regards,

Mike
  Reply With Quote
Old 22nd April 2006, 08:17 AM   #19
diyAudio Member
 
Join Date: Apr 2006
Location: midwest
Sorry owdi for not acknowledging your suggestion about WinISD.
It works great also.
Thanks!
  Reply With Quote
Old 24th April 2006, 06:39 AM   #20
simon5 is offline simon5  Canada
diyAudio Member
 
Join Date: Nov 2004
Location: Québec, Québec
Quote:
Originally posted by michaelpage26
Hm!
Well, Seas seems to be a little different compared to other companies that measure their drivers in free air, isn't it?
Does these measurements help a loudspeaker designer? I mean which one is preferable? (cabinet measuring or free air)

Regards,

Mike
Well, you get the best of both worlds. Some people want to have free air resonance and some people want a typical impedance curve. Usually you use speakers in a box, so the impedance curve in a box is usually more useful.

They give both, free air and in box measurements. Good stuff.
__________________
DIYaudio for President !
  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
choosing specs for driver that will be used for OB c3conv Multi-Way 3 21st November 2008 08:28 AM
how to understand driver specs? gasstronamicle Multi-Way 4 12th November 2007 08:48 AM
How can I find a driver's specs fin1bxn Multi-Way 0 24th January 2007 02:36 PM
Focal driver specs??? BigSmooth Multi-Way 0 23rd July 2005 09:26 AM
Any specs on this JBL driver? Bull Car Audio 4 19th September 2003 09:21 PM


New To Site? Need Help?

All times are GMT. The time now is 04:42 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