please help me pick pair of speaker

[tdt00]

hi all,
i'm currently have a pair of dynaudio dm 2/10 (no sub yet) run with rotel rsx-1056 in a room size 10' x 12' x 8'. i'm getting this boomy sound in the lower-end and nothing like a tight and deep bass. should i sell the dynaudio dm 2/10 and get something else? or what should i do? please advice me. thank you.

 

[boboi]

hi all,
i'm currently have a pair of dynaudio dm 2/10 (no sub yet) run with rotel rsx-1056 in a room size 10' x 12' x 8'. i'm getting this boomy sound in the lower-end and nothing like a tight and deep bass. should i sell the dynaudio dm 2/10 and get something else? or what should i do? please advice me. thank you.

What type of music are you playing back with the speakers? Also, the quality of the source does have an effect on how articualte different fequencies will sound. How close are the speakers to the nearest wall? Perhaps a little bit of adjustment with the speaker placement can correct the boominess. The article I posted below is a bit lengthy, but it shows a highly detailed step by step procedure to properly set up a stereo pair.

http://www.audiophysic.com/aufstellung/index_e.html

Hope it helps!

 

[highfigh]

hi all,
i'm currently have a pair of dynaudio dm 2/10 (no sub yet) run with rotel rsx-1056 in a room size 10' x 12' x 8'. i'm getting this boomy sound in the lower-end and nothing like a tight and deep bass. should i sell the dynaudio dm 2/10 and get something else? or what should i do? please advice me. thank you.

Describe the room's surfaces. You'll have some standing wave issues at about 140Hz and 280Hz with any speaker in a room with those dimensions. If the speakers are in the corners, pull them out and away from the back wall. Make sure they aren't aimed at 90 degrees to the wall and that you have a good amount of sound absorbing materials on the room. The first reflections need to be minimized. If possible, the speakers should be firing with the long room dimension, not across.

 

[tdt00]

hi,
i moved the left speaker away from the left corner and the lower-end sound seems to be a little better. the speakers are firing with the long room dimension. the problem i notice when walking around the room is that if i'm close to the speakers, i have less bass. but if i'm at the very end of the back wall, i have more bass. the room is very typical, with a twin bed up against the back wall with a regular computer desk next to the bed. the left speaker is on drawer with the tv on the left of its and the rotel, vcr, sat receiver, dvd player are stacked on top of each other then the right speaker on a stand positioning 6-inch lower than the left speaker. thanks for all of the help.

 

[tonmeister]

The bass boominess could be due to a number of factors: the speakers themselves, room resonances and boundary effects. By moving the speakers 3 ft away from the walls you will minimize boundary effects. Certain room resonances will not be excited or heard by putting the speakers or listener into the pressure nulls where they occur in the room at those resonance frequencies. Finding those nulls can be done a room mode calculators (if you room is rectangular) or with acoustical measurements. Multiple (2-4) subwoofers is another effective solution for canceling room modes over a seating area through acoustical interference. Or equalization works if you only want to correct at one location. Hope this helps. Good luck!

 

[WmAx]

What type of music are you playing back with the speakers? Also, the quality of the source does have an effect on how articualte different fequencies will sound. How close are the speakers to the nearest wall? Perhaps a little bit of adjustment with the speaker placement can correct the boominess. The article I posted below is a bit lengthy, but it shows a highly detailed step by step procedure to properly set up a stereo pair.

http://www.audiophysic.com/aufstellung/index_e.html

Hope it helps!

I have an issue with that link. In the last part, it claims that a sound delay reflection greater than about 5msec will not affect spatial perception. The article would seem to suggest to use reflections only if shorter than 5msec. This is not correct. A phantom reflection used to enhance spatial effect, should be within 5-10msec range, ideally. It can be as short as 4msec, but not shorter, or the effect starts to be one of a blended/blurry interference mixed with the original signal. It can even be a little longer than 10mse, but by then, the amplitude/SPL of the reflection is becoming very low, there by having not much beneficial effect in this regard. But when you near 20msec, and as you pass it, a different effect tends to occur known as the Haas effect, that slowly creeps in, and the sound is detected by as early as 30msec as a distinct separate delayed sound. It is not a black and white on/off effect, and gradually occurs, and this why I have to specify the later part of the transition range in my above statement.

Even the Haas window can affect spatial perception in some ways, as for example, the mind expects a long delayed version of the original signal in a very low SPL from the rear of say a classical concert hall during performance, or other long delays that are present at other large acoustic events. Lack of this subtle long delayed signal can marginally effect the realism in that respect, if one is accustomed to such performances that normally contain these delays.

-Chris