Listen to the music not the room!
If you are interested in recording, as a musician, or you enjoy listening to music on high end audio equipment you have probably already made a substantial investment for your listening pleasure? As a recording engineer monitoring is a hugely important part of the overall chain. If you are not hearing what you have recorded accurately then your final mix may suffer when played back on other systems.
The fact is most project studios and home listening rooms are probably smaller than ideal. Generally speaking the room response below 150Hz will be rather "lumpy" and probably will introduce some "modal ringing" into what you hear when monitoring through speakers. If you are a home theatre buff then you will  almost certainly be affected in your living room when the sub-woofer kicks off during action movies!!
I have been involved in acoustics one way and another since my University degree (Salford, BSc(Hons) Electroacoustics). Followed by my career in studio installation at the BBC and now running a mobile recording operation.
As a new branch of MDM Recording I am offering a "low cost" acoustic consultancy service. This is more about passing on knowledge that I have acquired through many years of practical involvement as well as the theoretical side of acoustics and predictive modelling. If you are running a project studio or are keen on improving your listening room for music or home theatre then please give me a call and I would be happy to chat and maybe come and take some measurements to see what can be done.
If you are planning to build a studio, or convert a room in your home for recording/mixing it is better to talk before you commit any funds!! There may be several options for achieving the isolation, room layout and internal acoustic treatment. I am happy to talk through your project and maybe help save you money in the long run, or produce a more formal specification, it's entirely up to you?
My special interest is the "low frequency end" of the spectrum since this is often the most demanding in terms of monitoring in small rooms. The upper mids and highs are less difficult to deal with since general home furnishings (carpets, curtains, sofas etc) when introduced to a bare faced room help to sort out that end of the spectrum.
There are a lot of general misconceptions banded about on audio forums, as well as frankly incorrect information and understanding of the fundamentals of acoustics. Often the basic difference between materials used to control sound transmission and those used for the purpose of sound absorption are confused.
Acoustics is often counter intuitive... For example would you use plasterboard to stop transmission of sound, or for sound absorption...? Well actually it can be used for both!! Depending on the depth of the stud partition and the thickness of the plasterboard it can be an absorber down at 50 or 60 Hz.
If you have a sound transmission problem (maybe your studio is in the garage?), or you sense that the bass response of your room could be better?.... then maybe I can help you. Tighten up your bottom end and your mixes will sound better and not end up bass light when played back on other systems. Talk costs nothing, if I can't solve your problem I will tell you! On the other hand, I could help make all that expensive HiFi equipment you have bought sound a lot better  :)