Best speaker placement

I have a 12 foot wide by 24 foot long listening room. I have my stereo and speakers facing the narrow wall. What benfits would I get by placing speakers at the end of the rooms in the corners. My stereo is a little bright at this placement. I had my stereo placed the opposite way years ago but I did not have this good of equipment to compare.. My current set up is a lot smoother but a tad bass shy. Bryston 4B SST. Adcom 750 Pre amp. Modified Shanling T-200. Acoustic Signature final tool TT. Graham 2.2 Tone arm. Benz L2. Acoustech PH1 P phonp preamp. Tandberg 3014A Cassette deck and a PS 1000 power regenerator. OHM I speaker with all driver upgrades. Kimber KGAC silver cables. Any opinion appreciated. Mike