John Sayers' Recording Studio Design Forum

Greetings Steve


At last I can get on the forum.

To be honest I would be also concerned about the Kinetics products as well.

I would advise anyone thinking of using them to contact Kinetics and ask about the resonant freqeuncy of the product under these conditions. The same goes for proucts like U-boats etc.

My previous comments apply to ANY mass-spring-mass system. The physics remains the same

Paul

I don't understand what you mean. F=5/(d^0.5) with d in cm. Standard equation.

Equationally confused:
Andre

Greetings Andre

Can you explain what this equation is for, and what is F and d.

cheers


Paul

For calculaing the resonant frequency of a mass-spring system. F is the resonant frequency, and d is the deflection of the spring with the load applied.

I guess it is one step removed from calculating deflections from physical properties of materials.

Formularly yours:
Andre

Steve,

I did a few measurements sitting in the chair, and the average spot ranges from 44-48" in my listening sweet spot. So how does 46" from the floor to the bottom of the soffitted speaker sound? (no pun intended )

I have finished framing the outer part of the soffit wall, except the very front where the monitors will go.

And, to make things interesting, I'm going to attempt what Sjoko did, and soffit mount my JBL's. And yes, I'm sure this will create some interesting issues. The 2 issues will be "Rear Port" & "Heat" from the built in amp. The front soffit cavities are actually farely large, so my thinking is, the amp can breath, and probably the port as well. (So we'll find out soon enough).

I'm just trying to figure out the best way to frame this very front section for speakers, making it larger for future change if needed, etc. Any suggestions?

Need more info on other dimensions; floor to ceiling at speaker, total width of room at speaker location (measured to outer edge of soffit where it meets the splayed walls), distance center to center of left/right speakers - also, you want to avoid placing your speakers too much above ear height; the pinae affect hearing response when out of horizontal plane, just started on that part of Newell's Recording Studio Design and will have to read more before I can explain it well.

Just when you think you're starting to understand...

Floor to Ceiling is approx. 86" if I remember correctly. Distance from L/R center of speakers is 7 ft.

See if this helps any...

Greetings Aaron

You should read the Genelec Technical papers on soffit mounting. There's about 3 or 4 papers on the subject on the Genelec Site.

btw - I've thoroughly searched the Internet for soffit mounting advice over the last 2 years, and the Genelec Site is the BEST, and probably only decent advice I can find.

Rear ported speakers are NOT suitable for soffit mounting. Speakers with amps on the back, should have the amps remotely positioned for the obvious heat reasons.

Soffit mounted speakers will require the bass to be reduced, as soffit mounting increase bass.

Genelec also advise a LOT of rear wall absorption, as soffit mounting excites the room modes more than free standing speakers.

You should also avoid any part of the soffits/soffit wall touching your main wall behind it for isolation reasons.

regarding fitting larger speakers in the future....

I have the same issue. Luckily it's ok to make the soffits larger than the speakers themselves. You stuff the gap with rockwool.

However the front bezel/soffit wall MUST be exactly flush with the front of the speaker cabinet ( to prevent diffraction ), and the BEZEL around the speaker MUST be as close fitting as possible without touching it

Have a look at my studio build diary http://forum.studiotips.com/viewforum.php?f=1

Apart from the drywalling I've just finished my soffit wall, and have designed it according to Genelec's recommendations.

Hope that helps


Paul

Lookin Good! I'll have to read up on it when I get a chance. Right now I'm having difficulty typing w/ only one hand. There was a neighbors cat in our warehouse here at work, and in the process of trying to remove it, it bit the crap out me and now my hand is soooo swollen... And of course, it's never had shots, so waiting to hear if I have to get rabies shots...Arghhh!!!

Any way, back on the subject...I noticed your chicken wire. I tried that under the first floor I was building...rattled like a bad spring reverb. Hopefully it won't cause you any issue's.

As far as the front wall section, it is completely isolated from the back wall, side walls and ceiling. The ONLY thing it's mounted to is the floating floor. I made sure to take the precautions on that.

I've already got most of it completed, just not the very front section.


Gotta run...it's quitin' time...

Aaron, that height should work given the ceiling height you mentioned... Steve

Cool. Well, next week I'll be doing major stuff in the studio.

Put the board up on the back wall, finish out some electrical, hope to complete most of the front soffit wall and bass traps.

Just picked up a bundle each of 1" & 1 1/2" 703 board (they were out of 2" till the end of the month). My truck looks like the beverly hill billies .

Picked up the 4 doors w/ glass yesterday and the plywood for the front wall, some mdf for between windows, bass trap hangers, and speaker soffits.

Finish out the walls for the soundlocks. Frame the second wall between the CR & LR. If I got any money left, maybe do the glass.

Bought a table saw for doing the fine detail work, and making life easier.

It looks like I'll loose my hole in the floor for the equipment racks. (really sucks, but need the floor space)...and all that work I did for those racks...the main purpose I floated the floor

And a question...how the hell do you make the bezels?


That's the latest low down. Can you tell, I finally got my '03 tax return...

And if I'm really lucky, maybe get some HVAC duct work done.

I hope to have lots of pix when I return from vacation.

Aaron

"And a question...how the hell do you make the bezels? " -

I'm assuming you mean bezels for your speakers; are you building with future upgrades in mind, or planning on the LSR's as your permanent speakers?

Which part of the construction aren't you sure of? Steve

Let's just say, I haven't even touched the the front wall this past week. However I have finished the second wall between the CR & LR (framed and insulated...just needs drywall.). And I finished framing the other soundlock and running electrical and insulating it. Just needs drywall.

And I've got about $800 worth of material I'm not ready for yet! Argh!!!

As far as the front wall, I'm completely baffled! Sorry, pun intended...

I'm trying to figure out the speaker stand scenario and how to construct. Trying to decide if I need to build a "Box" for the speaker or just a platform. Trying to figure out the construction for adding additional bass hangers (OH, and speaking of which...your drawing Steve shows linoleum & fiberglass insulation. Every hanger I've seen on this site has some type of white material wrapped around them. what the heck is it??????)

The baffle extension. Like what bluefield did. I'm lost, I'm confused.

And I'm in a freaking bad mood because I'm here in the office on my vacation because the damn firewall crapped out on the network last week. So, now that it's up, I'm outta here.

Catch y'all next week.

Back to vacation and a couple cold drinks!!

OK. Finally got the pix developed. So here we go...


Here's some of the second layer of drywall on the ceiling in the CR.

Here's the Iso Room floor and the Pergo being installed.