I'd worry a lot more about the parallel walls away from the proposed ledge. Suitable treatment elsewhere should improve your sound, while the ledge by itself, as already suggested by Ejlif, will, if anything, help a little, not hurt. I always recommend reading F. Alton Everest, "Sound Studio Construction on a Budget" or "Master Handbook of Acoustics" (edition later than the first), and will do so again. If you let him guide you, you'll end up with a room that's both aesthetically and acoustically pleasing.
Oak ledge in dedicated room?
I am finishing my lower level and my dedicated listening room will be smallish, (11' x 18' x8"). I have the option of having a 6 inch oak ledge four feet up from the floor the full length of the outside long wall. The ledge would asthetically look great. I could forgo the ledge and only have a straight up wall if the ledge would degrade room acoustics, (ie, nodes, standing waves, or whatever)? I am already planning on using dedicated lines, insulation, sound channel. Any input on whether to use the ledge or any other suggestions would be greatly appreciated. Thank you in advance for your time.
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