There is a small 8x6 mechanical room in one corner of the space so the shortest of the longer walls is approximately 32 feet.
Mounting speakers in corner of wall.
To help you decide how far to put the speakers from your wall use one of the three options given in this guide.
Ideal speaker placement for the front left and right speakers is 6 to 10 feet apart and positioned at seated ear level.
I intend to mount the speakers on this 32 foot wall but could mount one on the mechanical room wall so that one would be on the base and one on the leg of the l shape created by the connecting walls.
Try to locate the speakers at least 3 feet from a corner to avoid boomy bass from boundary effects.
Speaker wall mounts pair of universal side clamping bookshelf speaker mounting brackets large or small speakers 2 mounts 55 lbs capacity black mi sb37 4 6 out of 5 stars 819 28 99 28.
This is the only way to completely remove quarter wavelength cancellation caused by the wall behind your speakers.
When mounting the speaker bracket to drywall or paneling use toggler tb hollow wall anchors also included in the panavise hardware kit.
Ideally you will either flush mount them to eliminate boundary interference from the front wall.
Wali dual side clamping bookshelf speaker wall mounting bracket for large surrounding sound speakers hold up to 55 lbs.