- Sep 24, 2008
- Real Name
Mike, I want to throw in some information about audio even you got quite a few useful information from the forum.I've posted before on this but my room is a square 15' x 16' x 8' with a hallway opening forward right of speaker system and kitchen opening to the right side of the speaker system, both opening up with a larger door size opening (no doors btw) by the right speaker and subwoofer. The subwoofer is behind the right speaker. To the forward left of my speaker system is a foyer about 4' x 4' with my outside door. This subwoofer position is the best in my room. I've moved the subwoofer all over the living room and where it sits now offers the most accurate and deep bass out of any position. It really does sounds very good there. The good listening areas are at any seating position on my sofa which is about 1/2' from the back wall or to the sides of the sofa going into the corners but with a bass rise of 6 decibels from 75 to 81, but sound quality is still good.
My question is that at my listening area and my entire sofa area, I get a SPL of 75 decibels. To the sides of the sofa going into the rear corners of the room, I have 81 decibels of SPL. Also just a 5 feet forward of my listening position, I have a bass null in the lower frequencies even though the SPL is still at 71 decibels. Sounds much worse than 4 decibels. Will adding an identical subwoofer behind my left speaker help equalize the SPL (sound pressure levels) at my sofa and corners?? Also will the 2nd subwoofer help at all with the null about 5' in front of the listening position. Weird as the 5' in front of the listening position is the only area that has this significant null. Just to the sides of it are fine.
I will not be using any DSP or anything. I just was wondering if the 2nd subwoofer would help with equalizing the Sound Pressure Levels. I know that a 2nd subwoofer is usually for smoothing the bass but that honestly sounds good, just the differences in SPL is what bothers me as I would like to add some corner seats but not drown out the movie speech with bass.
BTW, I may be able to stick a 2nd sub in either rear corners but it will be a hardship with furniture and cosmetics.
The reason I ask is that prices came back down on my Klipsch R-120sw and if it will truly help, grabbing one now may be the thing to do. However I'm short on money and don't want to buy another sub if it won't correct these SPL issues.
Thanks for your help.
View attachment 149894
Please don't mind my poor drawing skills. I drew this up quickly on scrap paper.
Treble is uni-directional so the treble speakers should aim to the listener' ear level. Both speakers should be in the equal distance from the listener. Also treble is attenuate much faster than base. Thus, the distance of the speakers to the listener is critical. Bass is non uni-directional so the sub can be placed at any location but preferable closer to a wall or any construction and use the wall to bounce the sound back to the room.
I know you mentioned that you prefer to put the sofa close to the wall. However, part of the sound will bounce from the wall behind you to your ears and this delay could affect the clarity of the sound, depends on the type of material of the wall.
Sound power is calculated by the logarithm. For doubling the energy, it will increase the sound level, presume the placement in the same distance, for 3dB.
I personally do not think you need to add another sub-woofer, just experiment with the placement should do the job.