I'm preparing to mount some surround and 'back' surround speakers in a 7.1 setup and would appreciate some advice on speaker orientiation please. Has anyone here mounted their bookshelf or standmount speakers on their sides? Did it cause any problems and how did you mount them? Did it do anything weird to the sound? My main sofa is on a back wall and I'm considering wall mounting the surround speakers, with the 'normal' surrounds on brackets or shelves and the rear surrounds on the back wall but on their sides, so to speak. Cheers.