Multiple Subwoofer Placement

cjfrbw

Well-Known Member
Apr 20, 2010
2,402
172
63
Pleasanton, CA
#81
Well, I continue to be impressed by the Geddes array.

With two subwoofers, the sound is a warm, embracing tide.

When the third above ear sub is engaged, the bass takes on a profound Prussian discipline. It is taut, tight, disciplined and subtle.

With all three subs engaged, it is nearly impossible to not listen to the bass line when it is present, it is just really THERE.

If I want the warmer, more wavering hippie dude bass, I just have to turn the small above the ear sub off.

Cool.
 

Steve Williams

Site Founder, Site Owner, Administrator
#83
is it possible to get pictures of the sub set up with those who are employing the Geddes principle. i am very interested by this.
thanks
Me too
 

FrantzM

Member Sponsor & WBF Founding Member
Apr 20, 2010
6,464
2
38
#85
I was trying to attach a simple jpeg drawing but it came out wrong ... sorry ...
 

DWR

New Member
Jul 26, 2010
262
1
0
Western burbs of Detroit
#86
OK here are a couple of shots that I have on my computer now if you want another overall picture let me know. The first picture shows the 15" and 18" subs the 15 above the left sono tube sub and the 18 behind the right Abbey and to the right of the right sono tube sub. The sono tube subs are for lfe only and only used for movies obviously. The second picture just barely shows the third sub, it is on the extreme far right of the picture and looks like a dark picture frame you can only see about 30% of it in the pic. The only part you see of that third sub in the room is the grille and frame it is flush with the wall. The entire sub enclosure is behind the wall which is a coat closet the height of that sub is 53" and it is a 12" ported sub.
 

Attachments

cjfrbw

Well-Known Member
Apr 20, 2010
2,402
172
63
Pleasanton, CA
#87
1,2, 3 are subwoofer positions, with 3 being above ear level. Listening seat is indicated "seat", this is in a room about 19x13.5 ft with a dog leg to the left (not depicted).

Main speakers are opposite the listening seat into the room about four feet (planar speakers) out from the front wall a little bit further apart than subwoofers 2 and 3 on the back wall and equidistant from the seating position.
 

Attachments

Last edited:
Apr 21, 2010
106
0
0
New York
#88
thanks CJFRBW and DWR. CJFRBW, i am curious to know where the dog leg is as i also have a dog leg behind my sitting position. did that impact the placement of the subs. To both of you, have you tried Geddes solution of having one sub halfway between your sitting position and the speakers? My listening room is 19 x 40 x 10.5 (slanted ceiling) with the first 20 of the 40 enclosed and behind my listening position i have one wall open (dog leg) to the larger loft.
 

DWR

New Member
Jul 26, 2010
262
1
0
Western burbs of Detroit
#89
No I have not as it is pretty much not an option in my room. The fireplace being on the left side and the love seat on the right leaves me no real way to locate a sub in either location. I have thought of and may try moving the left side sub out next to the fireplace but that only gets it about 4 feet out further than it is right now.

Dan
 

Nyal Mellor

Industry Expert
Jul 14, 2010
590
2
0
SF Bay Area, CA, USA
#90
Assuming everyone is running the subs overlapping with the mains...what frequency are you low passing the subs at?
 

FrantzM

Member Sponsor & WBF Founding Member
Apr 20, 2010
6,464
2
38
#91
Hi

Trying one last time:

Seems to work this time
..
 

Attachments

DWR

New Member
Jul 26, 2010
262
1
0
Western burbs of Detroit
#92
72 hZ here, I run the mains full range and send the second full range signal from the preamp to the subs via a DCX-2496, the Abbeys start to roll off pretty quickly under 50 hZ. I have gone anywhere from 100 hZ to 50 hZ and found the bass sounds the best at the 72 hZ level. I delay the 3rd sub 5.82 mS to make up the distance difference and run all 3 subs 90 degrees out of phase with no EQ right now.

Dan
 

cjfrbw

Well-Known Member
Apr 20, 2010
2,402
172
63
Pleasanton, CA
#94
thanks CJFRBW and DWR. CJFRBW, i am curious to know where the dog leg is as i also have a dog leg behind my sitting position. did that impact the placement of the subs. To both of you, have you tried Geddes solution of having one sub halfway between your sitting position and the speakers? My listening room is 19 x 40 x 10.5 (slanted ceiling) with the first 20 of the 40 enclosed and behind my listening position i have one wall open (dog leg) to the larger loft.
New diagram, not absolutely to scale, with dog leg. I don't really let the dog leg influence my positioning of equipment, the room has a sloped ceiling for a trapezoidial cross section, but I think the dog leg acts as a good "mixing chamber".
 

Attachments

Last edited:

Nyal Mellor

Industry Expert
Jul 14, 2010
590
2
0
SF Bay Area, CA, USA
#98
All three of my subs LP at different frequencies. In general, since the LP is part of the "EQ", I would expect them to all be different.
What is the methodology to select the LP frequency for the different subs, assuming one has access to high resolution acoustic measurement equipment?
 

FrantzM

Member Sponsor & WBF Founding Member
Apr 20, 2010
6,464
2
38
Brian

Just cleaned it and replied to you ...
 

About us

  • What’s Best Forum is THE forum for high end audio, product reviews, advice and sharing experiences on the best of everything else. A place where audiophiles and audio companies discuss existing and new audio products, music servers, music streamers and computer audio, digital to audio convertors (DACS), turntables, phono stages, cartridges, reel to reel, speakers, headphones, tube amplifiers and solid state amplification. Founded in 2010 What's Best Forum invites intelligent and courteous people of all interests and backgrounds to describe and discuss the best of everything. From beginners to life-long hobbyists to industry professionals we enjoy learning about new things and meeting new people and participating in spirited debates.

Quick Navigation

User Menu

Steve Williams
Site Founder | Site Owner | Administrator
Ron Resnick
Site Co-Owner | Administrator
Julian (The Fixer)
Website Build | Marketing Managersing