You are not logged in. [Log In]


Forums » General Discussion » Home Theater » Multiple Subwoofer Set-Up & Calibration Guide

Page 1 of 6 1 2 3 4 5 6 >
Topic Options
Rate This Topic
#304877 - 05/04/10 09:25 PM Multiple Subwoofer Set-Up & Calibration Guide
Dduval Offline
devotee

Registered: 01/14/09
Posts: 349
Just an FYI...seems like a good read. Chime in with any thoughts...

Multiple Subwoofer Set-Up & Calibration Guide
_________________________
M80's, QS8's, M22's, CHT SHO-10, Dual CHT SS-18.1's, Onkyo NR3008, Mitsubishi WD-73740

Top
#304880 - 05/04/10 09:45 PM Re: Multiple Subwoofer Set-Up & Calibration Guide [Re: Dduval]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7786
Loc: Canada
Yup. If there is one thing Audioholics has done well over the years it is guides like this.
_________________________
Fred

-------
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

Top
#304882 - 05/04/10 09:58 PM Re: Multiple Subwoofer Set-Up & Calibration Guide [Re: Dduval]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10634
Excellent discussion by Gene both as to multiple subwoofer placement and Audyssey use. As he mentioned, this in large part results from Dr. Toole's research, as most recently updated in his book Sound Reproduction. I might add that one arrangement not mentioned in the article, two subs in diagonally opposite corners, can also be quite effective.
_________________________
-----------------------------------

Enjoy the music, not the equipment.



Top
#304885 - 05/04/10 10:20 PM Re: Multiple Subwoofer Set-Up & Calibration Guide [Re: JohnK]
Dduval Offline
devotee

Registered: 01/14/09
Posts: 349
 Originally Posted By: JohnK
two subs in diagonally opposite corners, can also be quite effective.


Thanks John, I was wondering about this. I may have to try this as I have both my subs in front corners. Which obviously is not in the guide.

My room won't allow me to place the subs on opposite mid walls, but I can do opposite corners. I'll have to try this over the weekend.

Dana
_________________________
M80's, QS8's, M22's, CHT SHO-10, Dual CHT SS-18.1's, Onkyo NR3008, Mitsubishi WD-73740

Top
#304892 - 05/04/10 10:37 PM Re: Multiple Subwoofer Set-Up & Calibration Guide [Re: Dduval]
htnut
Unregistered


 Originally Posted By: Dduval
 Originally Posted By: JohnK
two subs in diagonally opposite corners, can also be quite effective.


Thanks John, I was wondering about this. I may have to try this as I have both my subs in front corners. Which obviously is not in the guide.

My room won't allow me to place the subs on opposite mid walls, but I can do opposite corners. I'll have to try this over the weekend.

Dana


It's not in the guide, but is mentioned here:

http://www.audioholics.com/tweaks/get-go...s-part-1-page-6

Top
#304899 - 05/04/10 11:06 PM Re: Multiple Subwoofer Set-Up & Calibration Guide [Re: ]
Dduval Offline
devotee

Registered: 01/14/09
Posts: 349
Thanks, haven't seen that yet.

Dana
_________________________
M80's, QS8's, M22's, CHT SHO-10, Dual CHT SS-18.1's, Onkyo NR3008, Mitsubishi WD-73740

Top
#304934 - 05/05/10 03:29 AM Re: Multiple Subwoofer Set-Up & Calibration Guide [Re: Dduval]
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11703
Loc: Richland, WA, USA
 Quote:
Although it's been incorrectly touted as ideal to place four subs at each mid-wall location (since it offers consistent frequency response for each seat); this is NOT recommended because it will cause uneven frequency response for every seat and is also less acoustically efficient than just employing a single subwoofer! Thus the maximum available output level of four identical subwoofers placed mid-wall will be LESS than one subwoofer located in the front corner. In our opinion, this is a waste of power and money. We recommend avoiding this option for four subs unless you are stacking them for two locations.


Well, so much for my plan to do the four subs in each mid-wall. It sounds like the four corners is the way to go, but there's no good way to do that in the layout my basement will have. One corner is going to be a problem.

Top
#305037 - 05/05/10 09:43 PM Re: Multiple Subwoofer Set-Up & Calibration Guide [Re: CV]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10634
Not so fast, Charles. First, the language "...it will cause uneven frequency response for every seat..." doesn't appear to be supported by Dr. Toole's research or any other to my knowledge. In fact, the arrangement with one sub at each of the four mid-wall locations is one of those recommended both in the original Harman paper and the Toole book. Now, this relates to bass evenness, not bass strength. A sub in a corner is louder than a sub at mid-wall, so the mid-wall location is "inefficient" from the standpoint of level, although it can reduce unevenness caused by room modes. If the level is still adequate, this shouldn't be grounds for rejecting the mid-wall configuration.

If you read the book at pp.226-227, you'll see that a different four sub arrangement is most highly recommended from the standpoint of both level and evenness. This is a two mid-wall placement, but with two subs co-located(can be either vertically or side-by-side)at each position with drivers within a quarter wave length of each other so that they support each other with a resulting 6dB level increase. Dr. Toole states that "...it is, by a narrow margin in both MSV and overall sound level, the prime choice for a four-subwoofer solution. Either side or end midwall locations can be used. If corner locations turn out to be more practical, use them".
_________________________
-----------------------------------

Enjoy the music, not the equipment.



Top
#305052 - 05/05/10 10:41 PM Re: Multiple Subwoofer Set-Up & Calibration Guide [Re: JohnK]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13579
Loc: Iowa
I agree John, I don't recall Dr Toole making such statements, actually the opposite would be true according to his work. 4 subs at midpoint would be ideal and give you great response at all seating locations. Even Ian confirms this in his videos and graphs. This may not be possible for everyone. 2 subs at midpoints gets you almost to the same results and is easier for most to accomplish.
_________________________
M80s-VP180-4xM22ow-4xM3ic-EP600-2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB SonyUBPX800



Top
#305078 - 05/06/10 01:12 AM Re: Multiple Subwoofer Set-Up & Calibration Guide [Re: SirQuack]
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11703
Loc: Richland, WA, USA
Thanks for the reassurance, guys. It did seem odd to me. It was the first I'd seen of anyone shooting down the 4 mid-wall configuration.

Top
Page 1 of 6 1 2 3 4 5 6 >

Moderator:  alan, Amie, Andrew, axiomadmin, Brent, Debbie, Ian, Jc 
Forum Stats

15,272 Registered Members
16 Forums
24,080 Topics
425,184 Posts

Most users ever online:
883 @ 03/04/17 05:06 PM

Top Posters
Ken.C 18044
pmbuko 16437
SirQuack 13579
CV 11703
MarkSJohnson 11444
1 registered (Kevin1)
189 Guests and
4 Spiders online.
Key: Admin, Global Mod, Mod
Newsletter Signup