How to fix a lack of bass Null


Hi
Have tryed tying all sorts of different key words on Audiogon, until to day did'nt relised, that a room could be affected by a lack of bass, from what I read, this call a null, I have tryed different equipment over the last couple of years as I always thought that my equiment was bass shy. I found this programe on Audiogon called Hunecke speaker calulator, not shore if I am using it properly,It shows a big dip @31.5 - 63 hz and could explain a lake of base at my seating position, I cant seem to be able to move the speaker with the cursor, this is suppose to change speaker location and tell you flatess spot I think if I am reading it right? Do I buy a meter and setup disk? what treaments is there for this problem (Nulls), if this is the case?I google with know real answer's!
Room 5.250L x 4.00W x 2.4H
k_rose

Showing 2 responses by commcat

If you have your speakers facing the length of the room (5.250 meters) then the Bass Null is likely to be caused by reflections off the back wall. If you cover the back wall with bookcases, wall coverings, draperies or other acoustic dampening material the Bass reflections should be corrected. Moving the speakers will not prevent the Null. It is caused by the bass wave hitting the back wall and bouncing back into the room, in effect canceling the incoming bass wave as the two meet.
Another remedy is to place your speakers facing the longest wall. That is against the long wall (5.250 meters) and facing the opposite long wall so that you have a distance of 4.00 meters. Toe-in the speakers so that the sweet spot is approximately 10 feet from the speakers (or less than 10 feet if space is restricted). I use a flashlight placed on the top of each speaker to find an accurate sweetspot (where the light beams cross is the sweetspot). The sweetspot should be approximately 18 inches from the back wall. Cover the back wall with bookcases, canvas paintings, drapes, etc. This short throw may eliminate the bass null or cause it to occur behind the sweetspot, allowing you to hear the full effect of the bass without distortion.