IMHO, HT demands a room with lower reverb time as a lot of ambient info is accounted for in the surround tracts. Lower reverb time allows for improved speech clarity for HT dialog. Many acousticians shoot for an RT60 of 0.3sec in mod sized room.
In two channel music playback especially classical music, slightly higher reverb time improves the body or "sonority" of playback. Many acousticians shoot for RT60 of 0.35 to 0.4s in the mod sized room. Sure enough, acoustically dead room with maximal damping similar to an anechoic chamber would allow most insight into the recording. This is why many master studio/control room has RT60 of 0.25sec. The playback would not sound particular spacious and the speakers would have a tough time disappearing (very high ratio of direct sound vs indirect sound). These are the very qualities which many audiogoners strive for.
Most people in this hobby are not just after how a recording is made. I would think most wanted to create a musical involving experience which strikes a balance betw sonority and adequately low reverb.. Diffusors are great tools to cut down on slap echos without killing reverb. so clarity is maintained without sacrifizing sonority.
The theoretical ideal of an anechoic chamber is not easy or practical in most home situation. The midrange and highs can be easily absorbed but bass in most moderate sized room would be subject to many boundary effect which includes both boost and cancellations. Just look at the speaker measurements from stereophile where some efforts are spent to create pseudoanechoic measurement. Yet they differs significantly from same speakers measured by soundstage done in NRC. There is certainly the phenomena of acceptable bass rise (in reverb) but one need to experiment to see how much bass rise is desirable.
In tuning my room, I have got the RT60 to 0.25 to 0.28 and the detail, microdynamics and image specificity are very good. However, most listeners that come thru dislike the experience and feels the music is not flush out, harmonics are stunted, etc.
A lot of room tuning requires experimentation and learning. Not only learning about room acoustics but also about your own listening preference/priorities. I would choose an acoustician that is flexible to your needs, provide continuous supervision during construction and repeated experimentation after the initial phase is complete. There are many factors that mathematical modeling cannot predict.
After learning how to do the room measurements, you should learn how the measurements translate into what you are hearing. Then you can pick your compromised when faced with two opposing issues. At the end of consultations/contructions/reconstructions and there are areas of dissatifaction. Don't let measurements or consultants convince you that this is the sound you want. Continue to experiment and learn about psychoacoustics.
Regardless of expense or effort, I doubt there is a "perfect room". You may not even like an objectively perfect room. What you need is the right room for your enjoyment.
Good luck
In two channel music playback especially classical music, slightly higher reverb time improves the body or "sonority" of playback. Many acousticians shoot for RT60 of 0.35 to 0.4s in the mod sized room. Sure enough, acoustically dead room with maximal damping similar to an anechoic chamber would allow most insight into the recording. This is why many master studio/control room has RT60 of 0.25sec. The playback would not sound particular spacious and the speakers would have a tough time disappearing (very high ratio of direct sound vs indirect sound). These are the very qualities which many audiogoners strive for.
Most people in this hobby are not just after how a recording is made. I would think most wanted to create a musical involving experience which strikes a balance betw sonority and adequately low reverb.. Diffusors are great tools to cut down on slap echos without killing reverb. so clarity is maintained without sacrifizing sonority.
The theoretical ideal of an anechoic chamber is not easy or practical in most home situation. The midrange and highs can be easily absorbed but bass in most moderate sized room would be subject to many boundary effect which includes both boost and cancellations. Just look at the speaker measurements from stereophile where some efforts are spent to create pseudoanechoic measurement. Yet they differs significantly from same speakers measured by soundstage done in NRC. There is certainly the phenomena of acceptable bass rise (in reverb) but one need to experiment to see how much bass rise is desirable.
In tuning my room, I have got the RT60 to 0.25 to 0.28 and the detail, microdynamics and image specificity are very good. However, most listeners that come thru dislike the experience and feels the music is not flush out, harmonics are stunted, etc.
A lot of room tuning requires experimentation and learning. Not only learning about room acoustics but also about your own listening preference/priorities. I would choose an acoustician that is flexible to your needs, provide continuous supervision during construction and repeated experimentation after the initial phase is complete. There are many factors that mathematical modeling cannot predict.
After learning how to do the room measurements, you should learn how the measurements translate into what you are hearing. Then you can pick your compromised when faced with two opposing issues. At the end of consultations/contructions/reconstructions and there are areas of dissatifaction. Don't let measurements or consultants convince you that this is the sound you want. Continue to experiment and learn about psychoacoustics.
Regardless of expense or effort, I doubt there is a "perfect room". You may not even like an objectively perfect room. What you need is the right room for your enjoyment.
Good luck