Hi Bob ,
First of all i would like to say that correct me if im wrong but i think my mixer is an audio interface with USB. ------> http://www.mackie.com/products/profx8/
Please check out the specs on this and see what you think. Is my mixer an audio interface since it has USB connectivity ? Anyway i tried to ways to hook this up .1 Connected by way of USB .2 I hooked it by way of the out put of my computer 1/8 jack to 1/4 inch jack into the preamp that is built into my mixer .Hands down the connection with out the USB sounded better .When running it through the preamp channel 7/8 that is built into the mixer i got better results.

rharv yes you are right with pa speakers the further back you go the bass gets better due to the waveform in the air .The bottom line is the speakers are to big for the room im in i think .These speakers i think are not ment for house use they are just to dang big.I could go ahead and sell them but then i would have a power amp to deal with also .My power amp is pushing 550 watts per channel and im not sure if there are any smaller speakers out there that would match up with that kind of power. Maybe i should have went with a good pair of monitor speakers with a sub woofer of some kind to fill the room .My speakers i think were designed for long throw application . Rharv you make sence the room is not big enough and the speakers do not have a chance to get off the ground. It's like a race car not being able to get out of first gear . So yes you are right Waveform is playing a big part in this all. I tried to re arrange the speakers in the room and got some better results .I took the longest wall in the room and placed the speakers one in each corner. I then tried one of those BIAB demos and it sounded 10 times better. For a room that is about 11 feet by 20 feet im really thinking the sound system is to big for this room but much better since i placed the speakers on the longest wall. Thanks for exsplaining to me about Waveform in the air. The sound card in my computer may cause some quality lose but im now thinking the bigger factor is it has to do with the size of the room and the size of my sound system .

Regards,
Greg