Subwoofer Tests Explained - Page 5 - Home Theater Forum and Systems - HomeTheaterShack.com

 
Thread Tools
post #41 of 45 Old 08-21-08, 11:54 AM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: Subwoofer Tests Explained

I think he means not identical as in production tolerances.




We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
Sponsored Links
Advertisement
 
post #42 of 45 Old 08-21-08, 02:37 PM
Shackster
 
darrellh44's Avatar
Darrell
 
Join Date: Aug 2007
Location: North Dallas
Posts: 74
Re: Subwoofer Tests Explained

Illka,

Which 5400 driver from the Round 5 tests did you use for the recent 75L/200L sealed special test, the one from the sealed or PR'd enclosure?

Thanks,
Darrell
darrellh44 is offline  
post #43 of 45 Old 08-21-08, 02:48 PM Thread Starter
Elite Shackster
 
Ilkka's Avatar
Ilkka
 
Join Date: Jun 2006
Location: Finland
Posts: 1,468
Re: Subwoofer Tests Explained

Quote:
Ricci wrote: View Post
There were 2 different LMS drivers? All this time I thought that you tested the same one and just switched alignments with the one driver. I never noticed the slight increase in distortion above 50hz for the PR'd system before.
Yes, I have two LMS-5400 18" drivers. But even though the THD graph seems quite different, the difference is mainly caused by the 2nd order harmonic which isn't really that harmful or audible. Maybe some day I'll measure the other driver in that 100 liter sealed box so that we know for sure whether it's a difference caused by the driver or the alignment/box. In any case, I wouldn't worry about it that much.
Ilkka is offline  
 
post #44 of 45 Old 08-21-08, 02:52 PM Thread Starter
Elite Shackster
 
Ilkka's Avatar
Ilkka
 
Join Date: Jun 2006
Location: Finland
Posts: 1,468
Re: Subwoofer Tests Explained

Quote:
darrellh44 wrote: View Post
Illka,

Which 5400 driver from the Round 5 tests did you use for the recent 75L/200L sealed special test, the one from the sealed or PR'd enclosure?

Thanks,
Darrell
I used the one from the sealed enclosure.
Ilkka is offline  
post #45 of 45 Old 08-21-08, 04:16 PM
Elite Shackster
 
Ricci's Avatar
Josh
 
Join Date: May 2007
Location: Louisville, KY
Posts: 2,431
Re: Subwoofer Tests Explained

Quote:
Ilkka wrote: View Post
Yes, I have two LMS-5400 18" drivers. But even though the THD graph seems quite different, the difference is mainly caused by the 2nd order harmonic which isn't really that harmful or audible. Maybe some day I'll measure the other driver in that 100 liter sealed box so that we know for sure whether it's a difference caused by the driver or the alignment/box. In any case, I wouldn't worry about it that much.
Oh i wouldn't worry about that tiny bit of distortion myself either. It barely breaks 5% at a very high output level until 23hz. Still awesome performance, just not quite as squeeky clean as the sealed test.
Ricci is offline  
 

Bookmarks

Tags
explained , subwoofer , tests

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in









Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome