Dedicated HT Dimension question

[KODG]

ht room

go to cardas.com he has the perfect ht demensions!

i wish i had a clean slate to place my ht.

cardas.com will give you lenght /width/height for thr perfect ht (golden cubiod)

 

[Savant]

A ratio of 1:1.62:2.62 is hardly what I'd consider "perfect." In fact, the dimensions provided on their website result in quite a low ceiling and a modal distribution that's likely to cause issues around 50-60 Hz. It would be better to go with 21' x 13' x 8' if that ratio were to be used.

In general, there are no "perfect" dimensions. For example, 19' x 12' x 8' (1:1.58:2.38) provides a distribution of room modes that's just as good as the dimensions provided by the "golden cuboid." There are a variety of other possibilities that will work as well.

It hopefully goes without mentioning, but regardless of the ratios / dimensions, the room is going to require acoustical treatments.

 

[bpape]

Couldn't agree more. There are NO perfect rooms or room dimensions. All you can try to do is spread them out as much as possible and set what you're left with as something you're dealing with that's something you can address relatively easily with placement and treatment that's reasonable and doable in your room.

Cardas's layout will work with some rooms and some speakers and not with others. There is no universal answer. As for room ratios, I agree that what he recommends is far from ideal.

Bryan

 

[highfigh]

I am building mine 28' deep and 18' wide with 10'ceilings but I don't remember how I came up with this.

SWAG method?

 

[highfigh]

Some room mode calculators are available online and they not only speed up the calcs, they have visual indications for each mode so you can see if two or more coincide at or near a particular frequency. They have recommended proportions, too.

.6:1:1.6 is close to the Golden Ratio of .618 but generally, even distribution with whatever dimensions are available is preferred but not always possible. That being the case, room treatments help.

 

[Savant]

Some room mode calculators are available online and they not only speed up the calcs, they have visual indications for each mode so you can see if two or more coincide at or near a particular frequency. They have recommended proportions, too.

My favorite. (It's probably been posted before, but worth repeating.)

As for the recommended proportions, be careful. They are often regurgitated from acoustics texts that, while well-meaning, are often out-of-date on this topic. Most acousticians these days are in agreement that the oft-published "ideal" or "recommended" room dimension ratios are inferior in light of more modern design tools.

Speaking of which, there are also a couple of halfway decent not-free (but affordable) programs that will help predict the room response and/or optimize the room dimensions. RPG and CARA come to mind in particular.

 

[fractile]

A Perfect Room

This thread is a good place to mention a feature in a mastering studio I visited, basically a listening room where final polish is put on a recording mix before it's published. It was a smallish room, about 12x15x9, with a pair of big speaker boxes about 5-6' high on 9" concrete pads. The walls had what looked like fairly standard acoustic panels strategically placed. The striking feature of the acoustic treatment was a broad acoustic panel attached to the ceiling. It was flat, with a slowly undulating wave-shape that met on a down-slope into the rear wall.

What struck me, while listening from beside one speaker, looking back to the rear wall, was a very subtle, but cleanly noticable reverberation that added a perfect liveliness to the room.

I don't know how it was constructed, maybe with some perfboard covered with 2" acoustic material and decorative fabric? It sure sounded good.