New Construction Acoustic Design & Consulting


I need a professional consultant to work with my architect to help build as perfect a listening room over my garage as possible. RIVES is one possibility but I don't want to spend 10K just for the consulting work. I would like to build in as much sound isolation and room treatment as possible like that done for this person:
http://www.positive-feedback.com/Issue16/lavigneroom.htm--

Could I use ASC as a primary consultant and RIVES for after the room is built to do the final touch ups and room treatment? They only charge $100 for the engineer to help render sketches and make suggestions for the contractor.

acousticsciences.com

I would need detailed plans so that the architect would know how to impliment the built-in bass traps etc. I would need help with the specifics of window and door selection (materials) and placement, room dimensions, ceiling slope, floating floor, isolation etc... Please also see the list of ideas below. RIVES charges a fortune to render drawings based on a computer modeling system. I am not sure all of that makes sense until after the room is built, furnished and then tested, but certainly it is advantageous to build in as much acoustic isolation and treatment as possible from an aesthetic and cost perspective. Please comment on some of the suggestions below:

Room sizes

13X21X8 Feet
14 X18X8 Feet

windows o.k.
According to Dave Wilson

1. pitch ceiling height lower over speakers, higher over listener
2. Build bass traps into the wall
3. Corner loaded bass traps
4. Bass trap all four vertical corners and the ceiling perimeter corner with a soffit bass trap
5. Room dimensions:
Must over-size room by minimum of 6 inches walls, floor, and ceiling to allow for buildouts for acoustic treatments and sound isolation
A. 13-15 feet wide by 15-23 feet long
B. Room height 7-9 feet
must account for additional height of "floating floor"
C. Wall/stud resonance treatment and constrained layer damping: 1. Sandwich two layers of sheetrock. ? Gyproc Soundbloc 1.5 soundproofing plasterboard 2. Suspend sheetrock off studs by screwing into resilient metal fir strips called "z-metal" or "RC-1" 2. Visco damping material {1/16 " thick double sided adhesive visco-elastic sheet} is applied between the z-metal and the first sheet rock layer and a second visco-elastic sheet between the first and second layers. In place
of double sided adhesive visco-elastic sheet, can 100% glue to both sides a layer of sound board {firtex or celotex}. ? Staggered studs. The ceiling must be treated the same way.
D. Locate entry door behind the listner but on a SIDE WALL {nowhere near the speakers since the door will raddle} NOT ON A BACK WALL AND not flush to the corner and at least 2 feet from the corner. Door cannot rattle? Heavy acoustic door/frame?
E. Windows are very tympanic and should be avoided. Tall narrow windows are best.
Must not use standard thermal type instead use 2 layers of thick laminated glass [like that used for glass shelving in stores] separated by at least 4 inches of air space. The air space must be vented into the wall cavity. Set the glass into a bed of visco-elastic damping material. The glass sheets should be of different thicknesses.
F. Lighting should be subdued, indirect, and dimmable. Do not use standard wall dimmers since they will often hum or buzz. Use a variable voltage transformer. Consider low voltage lighting. Do not use ceiling cans, they rattle. The best light has a ceiling bezel and lens of thick rounded glass. Consider creating a false ceiling to hide projector, cabling, HVAC
ventilation big problem if room needs to be airtight to insure adequate sound isolation and room damping from the rest of the house
G. Address side wall, rear wall, and ceiling reflections which are determined by speaker placement. Room dimensions must account for acoustic panels
dbk

Showing 8 responses by stehno

I would prefer the 13 x 21 x 8 ft dimensions.

A lot of the points you mention above are good and definitively should be considered in the new room.

Assuming that the room is built well with all the basic elements(many of which you already mention), you may not need any special acoustic treatments.

I say that because based on my experience, speaker placement plays a far, far more significant role that room acoustics and treatments. In fact, I think it was Robert Harley of TAS who said a few months ago that proper speaker placement provides far greater benefit than any room acoustics. Or something like that.

Some to many say room acoustics makes up about 80% of the sound you hear. I'd guess it's probably more like 20% with the room/speaker interaction making up perhaps 50% of the ultimate sound you hear. I'm guessing but I'll bet it's a lot more accurate than the 80% rule.

One thing I would consider adding to your list is a beamed ceiling where the beams are spaced perhaps no more than 3 or 4 ft apart starting at the front (behind the speakers) and then perhaps every 3ft going toward the rear of the room.

Oh yeah, when it comes to furnishing you might consider heavy clothe/cushioned listening chairs or sofas, leaving the leather furniture, tables, floor lamps, etc. for another room. If you need a coffee table of sorts, you might consider a larger cushioned ottoman instead.

-IMO
Cinematic, my experience tells me that there are far fewer professionals in this industry that really know what good sound is and how it can be achieved than even I'd care to admit. Whereas you seem to believe that the majority of 'professionals' do know.

For one thing, it is not complex as you say. It's actually rather simple, so long as one knows what they are doing. Mutifaceted? That too makes it sound 'complex'. I suppose if one were to make it seem complex and convince others of the mutifaceted complexities, then perhaps it's easier to sell a product or service.

Nevertheless, I repeat that if a professional consultant cannot demonstrate a system/room combination that s/he designed that absolutely bowls one over with it's sonic presentation, then it is perhaps best to keep looking or take on the project yourself.

Surely, you can appreciate that.

To a certain degree, your response above validates my point.

-IMO
Or you can use a little common sense.

There are no guarantees whatsover that hiring a professional consultant will do a better job than you.

In fact, if your would-be consultant can not demonstrate for you a real system/room combination that s/he designed that absolutely bowls you over with it's sonic presentation across the frequency spectrum, you are probably better off to keep looking for another or perhaps consider taking on this project yourself.

As with some to many things in life, designing a truly superior system and associated room is perhaps more art than science. And "for the level you imply" ultimately, this generally can be accomplished only over a long period of time.

-IMO
Cinematic, just to get an idea where you are coming from, what percentage of enthusiasts and professionals do you suppose have truly superior sounding systems?

As for the 'luck' that you flippantly impose on my supposed achievments. Save the the luck category for somebody who needs it, will ya?

As for your statement about being honest to yourself and everyone else. That kind of talk is just plain silly and without substance. But it sounds sooooo good.

A great sounding system is kinda' like an absolute truth. Something is absolutely true whether we believe it or not. I don't make it true and you don't make it false. It either is or isn't true and it stands in and of itself.

One should be able to pretty much say the same thing about a great sounding system, a fine automobile, a fine wine, etc., etc.. Regardless of personal preferences.

I'm not trying to take away anything from those professional consultants who truly know what they are doing. I was simply pointing out that there are absolutely no guarantees that one of these can do a better job.

Surely, you are not saying that all professional audio consultants know what they are doing, are you?

-IMO
Now there's a consultant worth interviewing!!

Good points, Soundprogression.

-IMO
mikelavigne,

No offense, but with the amount of time and money you've obviously invested in your system and room, no matter what the end results may be, you'd look rather silly if you admitted a bias toward any other path, don't you think?

-IMO
Stenersr, where did you fly in from? You must be the new bouncer everybody's talking about.

I made no comment whatsoever about Mike's room. In fact, I like it quite a bit and would deem it as perhaps one of the better rooms I've yet seen. But that's just my perception and ultimately I couldn't tell squat without hearing it combined with his Exquisites and surrounding system.

I don't know who you are, but surely you must know that a room is nothing without a system properly set up and perhaps most importanly, a speaker's interaction with the room thru proper placement. Which by the way, far exceeds the importance of a room's acoustics. Not to mention every part of the system first interacting with the speakers.

But all that is beside the point since I made no comment whatsoever one way or the other about the sonics of Mike's room or his system.

And I suggest that before you develop another butt rash, why don't you reread my previous post. What I said there was only meant to be taken at face value.

BTW, I'm awefully curious how you're little behind landed in this thread so quickly after my last post. Please share.

-IMO
Hi, Mike. Certainly no need to explain and FWIW, your last post seems to be a very sensible position at that.

Perhaps my previous comment sounded a bit sinister and if so, I apologize. But I really did not mean for anything to be read into it other than what it said.

On another note, I was wondering when you'd be changing over to the VS speakers. I heard the Exquisites at your friend's house in Portland.

I don't care what anybody says about their performance, if I could afford them, the Exquisites are the only speaker I'd buy based on their looks alone. (Of course, I'm also quite confident I can make 'em sing like nobody's business.) But I have yet to see a picture do their aesthetics justice.

Anyway, sorry for the comment.

-IMO