Sub testing results confusion... - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #11 of 18 Old 08-21-06, 04:40 PM
Elite Shackster
 
SteveCallas's Avatar
Steve
 
Join Date: Apr 2006
Posts: 2,398
Re: Sub testing results confusion...

The weekend? But it's only Monday.....and now you've got me interested in finding out what the results are going to be
SteveCallas is offline  
Sponsored Links
Advertisement
 
post #12 of 18 Old 08-22-06, 10:47 PM Thread Starter
Senior Shackster
 
Vader's Avatar
Derek
 
Join Date: Jul 2006
Location: Colorado
Posts: 402
My System
Re: Sub testing results confusion...

OK, last night's results:

First, I re-did the room response from the sweet spot. Without EQ, it doesn't look too bad (and the room gain was increased slightly as all doors leading out were closed...)

Sub testing results confusion...-raw-response.jpg

Then, I measured nearfield (this is where I think I messed something up). As I have dual cylinders (placed about 1" apart), I placed the SPL meter between them, on the axis of symmetry (I couldn't have gotton the mic any closer w/out cramming it between the base pate and the woofer):

Sub testing results confusion...-near-field.jpg

It occured to me (after shutting everything down) that the subs were still corner loaded when I did the near field, so room gain did still come into play. Once I get a BFD, I think it will improve a great deal...

Peace... Vader

"Ya see, we plan ahead. That way we don't do anything right now. Earl explained it to me." - Valentine McKee

One sub to rumble them all. One sub to shake them. One sub to humble them all. And in the darkness break them....
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.
- Not liable for injuries sustained while laughing.
Vader is offline  
post #13 of 18 Old 08-22-06, 11:08 PM
Elite Shackster
 
SteveCallas's Avatar
Steve
 
Join Date: Apr 2006
Posts: 2,398
Re: Sub testing results confusion...

No, you can't place the mic between them. Run one sub at a time with the mic on the baseplate. The BFD isn't needed for this test.
SteveCallas is offline  
 
post #14 of 18 Old 08-23-06, 07:11 PM Thread Starter
Senior Shackster
 
Vader's Avatar
Derek
 
Join Date: Jul 2006
Location: Colorado
Posts: 402
My System
Re: Sub testing results confusion...

OK, I performed measurements of both cylinders seperately (with the meter between the base plate and the tube), and here is what I came up with (both subs were, for all intents, the same):

Sub testing results confusion...-leftcylindernf.jpg

Looks as if the TF is around 22.8 Hz, correct?

Peace... Vader

"Ya see, we plan ahead. That way we don't do anything right now. Earl explained it to me." - Valentine McKee

One sub to rumble them all. One sub to shake them. One sub to humble them all. And in the darkness break them....
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.
- Not liable for injuries sustained while laughing.
Vader is offline  
post #15 of 18 Old 08-23-06, 09:20 PM
Elite Shackster
 
SteveCallas's Avatar
Steve
 
Join Date: Apr 2006
Posts: 2,398
Re: Sub testing results confusion...

Yep, thanks.
SteveCallas is offline  
post #16 of 18 Old 08-24-06, 03:36 AM
 
Join Date: Jul 2006
Posts: 41
Re: Sub testing results confusion...

If I'm not mistaken I seem to remember that Ilkka measured the tuning frequency of the PB12-Ultra to be 20.5hz, and if I try to go even further back in my memory I can remember reading that the box versions are tuned deeper than the cylinders
Manic Miner is offline  
post #17 of 18 Old 08-24-06, 06:54 PM
Elite Shackster
 
SteveCallas's Avatar
Steve
 
Join Date: Apr 2006
Posts: 2,398
Re: Sub testing results confusion...

That would seem to jive wouldn't it? Vader is measuring a 20-39 cylinder.
SteveCallas is offline  
post #18 of 18 Old 02-17-07, 08:25 PM
louis
 
Join Date: Sep 2006
Location: Taipei, Taiwan
Posts: 73
Send a message via MSN to lienly Send a message via Skype™ to lienly
Re: Sub testing results confusion...

I ain't a techy guy, so can anyone explain how to analyze such graphs? tks
lienly is offline  
Reply

Bookmarks

Tags
confusion , results , testing

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 post new threads
You may 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