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How to Solve High-Frequency Suckout in Room?

After upgrading my system including speakers, I'm noticing with more upper frequency detail, that the right channel has some degree of missing high frequencies.  I've confirmed it is my room by swapping speakers, swapping cables for left / right, and of course the cables are all in phase.

My room is quite large, open concept, but my system is to one side of the open area.  Ceilings are vaulted and are 12ft at highest point. The speakers are not near any corners, due to a jut-out on the right side and the other end being completely open. However, there is a partial wall on my right side that has no treatment on it that extends up to 12ft, from the listening position.  This wall starts 3.5 feet in front of the right speaker (about 1.5 Ft to the right of the right speaker) and continues to behind the listening position. 

I've tried putting pillows against the right wall and thought it may have made the problem worse?  There is no wall on the left side, it is completely open.  Does this make sense that there is missing high frequency on the right side, where the wall is?  And, is there anything I can do to fix this?  I will attempt to draw the setup but I'm guessing the alignment will mess up when I post this! 

 

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nyev

Showing 4 responses by jetter

jetter
2,963 posts
 

I wish you had one or two of the Stereophile Test CDs where you could play the frequency sweeps. 

They are expertly crafted and you would expect identical everything from both channels other than from room impacts.  

Sounds like you are pretty much satisfied that you have found the issue.   Enjoy your beautiful system.

jetter
2,963 posts
 

It's curious that it did not occur also with your first pair of speakers.  

jetter
2,963 posts
 

Thank you for your response and it's always nice to see pictures of the gear in the listening space.  Your gear is miles above mine so please take this with a grain of salt.

I experienced a similar problem as you are having, switched speaker positions and the imbalance (for lack of a better description) stayed on the same side of my room.  And when standing close to the speakers there was no imbalance.  

I have no idea what this means, but in my case I found that if I stand near my listening position and face away from the speakers, the sound was identical from both speakers.  I eventually decided it may be a hearing issue and by adjusting my speaker position I was able to compensate for the difference.

I have been following your last few threads and remember in a prior thread you emphasized you wanted just a TAD more bass but did not want to use digital sound processing to achieve it.  I've never used any DSP so consider this coming from a real amateur.  But seeing your set up, it's hard to see how you will fit RELs in the room without a major reshuffle of your gear and audio furniture and to also take care of the treble problem maybe you should consider it.  A lot of people swear by it.

I am only speculating, but it seems to cure the treble suck out on the right you are going to need to find a way to create an equal suck out on the left without DSP???  Again, just guessing out loud.

jetter
2,963 posts
 

Does your integrated have the ability to play in mono to verity your findings, i.e., that the difference in the left and right speaker sound is from differences in the source material left versus right stereo track recording?

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