Subwoofer in the corner? Forget about it


Since installing new horn speakers, I have been learning a little about extracting their best performance. They require some effort and knowledge to get right - and the effort is the easy part.

Following "common wisdom", I placed the sub in the left corner, to the rear and outside of the left main speaker. The result was a disaster.

Boomy, one note bass, little tone and texture, very uneven response at different locations in the room, and no musical connection. This wasn't good enough for screening reruns of "Deuce Bigalow: Male Gigolo" on a HT set-up.

I repositioned the sub to the midpoint of the right-side wall. Now, it is a little forward and to the side of the right main speaker. Initial results are promising: Lower bass output (expected going from 3 corner boundaries to 2 wall/floor boundaries), coupled with musical LF, toneful and engaging. The difference between just moving alot of air and making proper musical bass is huge.

Here are two articles I found interesting:

http://www.harman.com/wp/pdf/multsubs.pdf
http://www.audioholics.com/techtips/setup/loudspeakers/SubwooferplacementP1.php

both use models and measurements to confirm my listening experience - corner loading the sub is loud and rough, compared with other locations. And multiple subs are smoother than a single sub. Now, I just have to bite the bullet and make room for another refrigerator sized horn sub in my listening room.

scott

Listening room: 15' x 18', suspended wood floor
Music used to evaluate sound:
Rachmaninoff, piano concerto 2
Astor Piazolla, Adios Ninos
Saint Saens, organ symphony 3
Rodrigo, concierto de Aranjuez
Doctor John, Duke elegant
Joe Pass, Portraits of duke Elington
skushino
Listen to Warren--do it by ear.
You're getting 6db+ of non linear bass reinforcement in corners.
Larry
The boomy bass that most audiophiles hear is due to resonance of the walls, not the corner position of the subwoofers. The corner position of the subwoofer intensifies the bass by acting as a megaphone which also can intensify the boomy resonance. This wall distortion can be neutralized with proper wall treatment (resonant sound channels, a double layer of half inch drywall: one gray, one green board, and with ACS sound absorbing squares sandwiched between the two boards). As mentioned by Ekovalsky, a digital sound processor will also work well.

All of my speakers (a pair of Klipschorns and a pair of TacT W410 subwoofers) are designed to fit into corners. With the Marchand XM6 crossover set at 35Hz, the two pairs of speakers are flat from 12Hz to 12000Hz. This is possible only with wall treatment and tweaking the metal horns in the Khorn.

It is true that placing the subwoofers in the center or sides of the room will make the bass "smooth". But then a "smooth" sound is soft and quiet which defeats the purpose of a subwoofer.

>>But then a "smooth" sound is soft and quiet which defeats the purpose of a subwoofer.<<

Wrong. The purpose of a subwoofer is to reproduce lower frequencies that the mains are unable to handle accurately. Nothing more or less.
I had that problem (boominess, one-notey bass, overhang, slow to start and slow to stop) in the past but ever since adding a subwoofer stand w/ some blue tak (or Office Depot substitute at substantial savings), most of the drawbacks are now gone. I think this is one of the most overlooked option but an absolute neccessity (at least for myself). I have been using and recommend this :

http://www.lovanusa.com/product_info.php?cPath=29_52&products_id=73

but other options should work well as long as they're well constructed and gives the sub some clearance to the surface beyond what cones can do.

Happy listening!
Luc
It is interesting that moving my ears (head) slightly forward or backward from my seat makes a noticable difference in bass. Room nodes are not visible, but they are very audible in my room. I also notice that the bass is much louder and boomy when I stand in a corner. Corners would be a terrible location for locating the equipment rack, even if convenient.