Temporary Control Room Treatment

Hey everyone, I've got my studio in a temporary spot right now (several months) and need some help getting my monitors to sound right. The room is about 40'x25', but also serves as a living room. I have the monitors about 10-12' from one of the short walls (facing that wall), so theres about 30ft of space behind the monitors. I've lost all of my bass response. I haven't put up any absorbers on the wall behind my mix position yet, but I plan to. Am I going to need something behind the monitors to get the bass response back? What is the cheapest temporary thing I can do here to get ok results, as far as absorption on the wall behind me, and/or something behind the monitors to get my low end back? Keep in mind that this is a temporary situation. so nothing fancy. I can post a photo or diagram if it would be helpful. Thanks for your help guys, I find this forum to be very helpful. Scott

Build some low-freq absorbers for the FRONT wall (behind the speakers) that you'll be able to use wherever the final permanent position ends up being. These don't necessarily have to be full-range absorbers because most of the sound that comes out of the backs of the speakers will be low freqs- but you may want to deaden the overall room response, so this is up to you. Panel traps or slot resonators here is what you want- perhaps just putting rigid fiberglass over the corners will do enough. Having your monitors spaced that far from your walls is helping a lot with phase, so chances are it's just the overall room modes that are bugging you. But yeah- if this is temporary, build or buy stuff you'll be able to move into the permanent spot later on.