The limited thickness foam treatments that you have may actually be increasing the apparent "bass bloat" that you are experiencing. Due to their non-linear frequency absorption characteristics, which will suck up the highs and upper mids, the bass will tend to stand out even more. As such, you really have to treat the whole room / entire audio spectrum evenly or know exactly what you are doing when using "partial spectrum" sound absorption treatments.
Other than that, your room acoustics will be very hard to work with. As Rives mentions, the room nodes will be very sharp and hard to tame due to the reinforcing measurements. All square rooms will suffer from this. While opening doors and windows in that room might help somewhat, that is obviously not a real solution, especially at this time of year.
Other than the digital equalizer's mentioned above, an old fashioned graphic or parametric might be able to make things far more bearable for a just a few bucks. You can typically find used multi-band EQ's for anywhere from $20 - $50. Since you mentioned that this is primarily for HT use, the sonic degradation that takes place with an EQ would be far out-weighed by the benefits of a more neutral tonal balance. On top of this, you really don't have to read a manual as these "old fashioned" EQ's are nothing more than a fancy tone control that adjusts band by band. A little trial and error with various slider positions and a few bucks might get you a long way towards enjoyable viewing and listening.
I only mention this as many people are "techno-phobes" and digital gear with thick manuals scares the hell out of them. This is not to mention that reasonable results for low dollars spent is always hard to beat. Sean
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Other than that, your room acoustics will be very hard to work with. As Rives mentions, the room nodes will be very sharp and hard to tame due to the reinforcing measurements. All square rooms will suffer from this. While opening doors and windows in that room might help somewhat, that is obviously not a real solution, especially at this time of year.
Other than the digital equalizer's mentioned above, an old fashioned graphic or parametric might be able to make things far more bearable for a just a few bucks. You can typically find used multi-band EQ's for anywhere from $20 - $50. Since you mentioned that this is primarily for HT use, the sonic degradation that takes place with an EQ would be far out-weighed by the benefits of a more neutral tonal balance. On top of this, you really don't have to read a manual as these "old fashioned" EQ's are nothing more than a fancy tone control that adjusts band by band. A little trial and error with various slider positions and a few bucks might get you a long way towards enjoyable viewing and listening.
I only mention this as many people are "techno-phobes" and digital gear with thick manuals scares the hell out of them. This is not to mention that reasonable results for low dollars spent is always hard to beat. Sean
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