Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Twelve sub locations
Twelve sub locations
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 7th October 2019, 04:00 PM   #1
bentoronto is offline bentoronto  Canada
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Twelve sub locations
Default Twelve sub locations

I mention this now and then, but here's the data.

When re-decorating our music room, I placed a sub (AR-1 about 1956) in a dozen (or so) locations. These were mostly against the far wall but also adjacent along the sides a bit. The mic location was stationary where my chair would be towards the middle of the room.

The dB scale is not calibrated.
Attached Images
File Type: jpg 12 locations.jpg (152.6 KB, 203 views)
__________________
HiFi aspirations since 1957. "When the toilet paper of experience is depleted, the backside of Reason goes unwiped"

Last edited by bentoronto; 7th October 2019 at 04:03 PM.
  Reply With Quote
Old 7th October 2019, 04:08 PM   #2
bentoronto is offline bentoronto  Canada
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Twelve sub locations
And here is the best (can't remember the location) and after some EQ.
Attached Images
File Type: jpg best and EQ.jpg (62.5 KB, 201 views)
__________________
HiFi aspirations since 1957. "When the toilet paper of experience is depleted, the backside of Reason goes unwiped"
  Reply With Quote
Old 7th October 2019, 04:19 PM   #3
adason is offline adason  United States
diyAudio Member
 
adason's Avatar
 
Join Date: Nov 2004
Location: Maryland
Some run the sub below 40Hz. Looking at your responses, below 40Hz is similar.

How high do you use it?
  Reply With Quote
Old 7th October 2019, 04:31 PM   #4
bentoronto is offline bentoronto  Canada
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Twelve sub locations
Quote:
Originally Posted by adason View Post
Some run the sub below 40Hz. Looking at your responses, below 40Hz is similar.

How high do you use it?
Can't make sense of your first sentence.

I don't use the AR-1 in my every day system. Being a small box, it was useful for these tests.

For about 50 years and several crossovers, I've used about 135 Hz, 24dB/8ave, electrostatics mostly. And all kinds of subs. With cone mids, a bit lower would make sense.
__________________
HiFi aspirations since 1957. "When the toilet paper of experience is depleted, the backside of Reason goes unwiped"
  Reply With Quote
Old 7th October 2019, 07:40 PM   #5
adason is offline adason  United States
diyAudio Member
 
adason's Avatar
 
Join Date: Nov 2004
Location: Maryland
Can't make sense of your title...sub location run up to 500Hz?

Last edited by adason; 7th October 2019 at 07:43 PM.
  Reply With Quote
Old 7th October 2019, 07:42 PM   #6
adason is offline adason  United States
diyAudio Member
 
adason's Avatar
 
Join Date: Nov 2004
Location: Maryland
If I look at your responses, they are similar below 40Hz, that means not a location dependent. Good enough explanation of my first sentence?
  Reply With Quote
Old 7th October 2019, 07:54 PM   #7
bentoronto is offline bentoronto  Canada
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Twelve sub locations
Quote:
Originally Posted by adason View Post
If I look at your responses, they are similar below 40Hz, that means not a location dependent. Good enough explanation of my first sentence?
Got it.

It is fair to say speaker location influence (within my set of test locations, room, absence of furnishings except for wall to wall carpet with underlayer, and using a "bookshelf" woofer on the floor) is substantial for every freq below 500 Hz but not much below 40.

B.
__________________
HiFi aspirations since 1957. "When the toilet paper of experience is depleted, the backside of Reason goes unwiped"
  Reply With Quote
Old 10th October 2019, 03:04 PM   #8
Juhazi is online now Juhazi  Finland
diyAudio Member
 
Juhazi's Avatar
 
Join Date: Mar 2007
Location: Jyväskylä, Finland
So, measurements follow theory and experience well. We see room mode dips and peaks below 100Hz, and some variation in amplitude of those because of different location of sound source. Above 150Hz variations are wider spread, Schröder effect weakening. Below lowest mode response is almost constant (one measurement being exception - why?)

Listener/mic location has much more influence on the response in modal range below Schröder.

It would have been nice to see the effect of multiple subs. I have tried it and results were not good in a small room, mode dominance is so high!
__________________
Radikal aktivist AINOgradient speaker project
  Reply With Quote
Old 10th October 2019, 03:27 PM   #9
bentoronto is offline bentoronto  Canada
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Twelve sub locations
Quote:
Originally Posted by Juhazi View Post
...Listener/mic location has much more influence on the response in modal range below Schröder.

It would have been nice to see the effect of multiple subs. I have tried it and results were not good in a small room, mode dominance is so high!
I love seeing Schroeder referenced since it gives me a chance to mention that I saw him at Bell Labs (OK, his office was just down the hallway from mine).

There's no disputing the science, I suppose. The match of theory and practice "on the ground" in my room are, as Juhazi says, seems correct (as always with Juhazi).

But if you know your Schroeder freq (which I do not... but should), so what to do*? What do you do differently as compared to not knowing it? Acoustic interventions are very blunt tools.

B.
* folks with subs in the same box as their mids and tweets face certain compromises which folks with separately housed subs (like most of us) do not
__________________
HiFi aspirations since 1957. "When the toilet paper of experience is depleted, the backside of Reason goes unwiped"

Last edited by bentoronto; 10th October 2019 at 03:37 PM.
  Reply With Quote
Old 10th October 2019, 04:22 PM   #10
scottjoplin is offline scottjoplin  Wales
diyAudio Member
 
scottjoplin's Avatar
 
Join Date: Dec 2015
Location: Penrhyndeudraeth
Quote:
Originally Posted by Juhazi View Post
It would have been nice to see the effect of multiple subs. I have tried it and results were not good in a small room, mode dominance is so high!
Was it à la Geddes?
  Reply With Quote

Reply


Twelve sub locationsHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Transformer locations mattress67 Power Supplies 3 28th April 2016 08:30 PM
T20001bd - Driver transistor locations please. Troy Dionne Car Audio 3 13th February 2015 02:40 AM
DIY / Fine Art - Twelve Twelve Hundreds - A Turntable Exhibition - Technics 1210 nathanjh13 Analogue Source 1 18th January 2014 03:41 PM
Driver locations Tomv Multi-Way 10 24th November 2007 07:33 AM


New To Site? Need Help?

All times are GMT. The time now is 05:10 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki