BEF from Norway,DIY Uncompromising Theater - Page 2

nice! may i ask why the decision for such shallow diffusers?? all of the work is in cutting and gluing - wouldn't have been very much extra work/time to build with a much lower design freq. did you utilize a calculator (for primitive root number sequence)? or did you just randomly put them together??

something's wrong with that calculator - PRDs are NOT to have the same number of wells (vertical and horizontal).

that calc is showing 12x12

PRD well #s should multiply to be the Prime number - 1.

so if you're using Prime # 157, then your wells could be 12 x 13

12 x 13 = 156 (which is Prime # 157 minus 1).

bear in mind also the HF cut-off will change due to angle of incidence (on the ceiling) being non-normal. just FYI.

yeah that's an old BBC PRD sequence that actually is an array of many smaller PRDs.
severely limited design - this sequence really does make the rounds on the internet, tho


http://www.bbc.co.uk/rd/pubs/reports/1990-15.pdf
http://www.bbc.co.uk/rd/pubs/reports/1995-01.pdf

You should start a thread in the DIY Speakers and Subs forum. Nice job on the speakers. What's the purpose of the drywall in the sub enclosures?

Have you taken measurements to see how they perform?

Tim

Nice buiild -both the room and the speakers . What's the dimensions of the room?

Nice wiring job, very clean, well done.

Sweet. That's pretty much exactly the dimensions I have to work with in my new(ly bought, piece of crap infinite restauration project-)house.I won't do a room-in-the-room build (initially). BTW, bold move to cover up the windows Otherwise, with Nordic conditions and building standards in mind, it looks like a sound build moisture-wise as well as sound wise.

I semi-frequent Norway in "bursts" so if you're situated around the Oslo area I might just have to schedule a visit to get my inner organs pulverised. next time "norway is calling"

regards,

H

SERIOUSLY NICE JOB..........................WOW MAN DUDE the speakers you have OH MAN.. Im drooling:D

I couldnt beleive it when you said SKYLINE DIFUSER PANNELS and then you made your own......We are both thinging alike....Although I made mine with Foam and spent a few days making two pannels for my old room. I researched the wood blocks and then found a company making the SKYLINE with foam and they are 250.00 for a 24" X 24" pannel......Yea I made my own for 60.00 a panel and they are 24" by 6 feet

I built a complete staggered acoustic ceilign for my new room and didnt want to use the pannels although after the work involved building them I will put them somewhere...They got a little damaged in my last move but very easy to fix.

Im not going to hijack your post and post pics of my stuff....Much respect man killer killer impressive work! Norweigan engineering at it finest!
If your doing systems like that in Norway for a living Id sell my house sell my business and come for you
Edited by Vic C - 6/30/12 at 7:40pm

You guys with the pro audio amps I give a big fat thumbs UP

I used to be ridiculed for years because of the use of pro amps and now what Ive been saying for years is comming true.....My business is based on it and now my new loudspeaker co is going to be a continuation of the principals.....

Crown I techs DAMN I havent used them but I hear they are animals....Ive used the XLS series and Im very impressed with what they are doing with Class D.......The Yamaha's stole my heart though a few years ago and I made the switch from older QSC's.

I also like the QSC CX series since they are basicly the same as the DCA's that are true cinema amps. I would definetly suggest those as well when condidering amps.

BEF

Yea The only theaters Ive done recently was my own in my new home and a bedroom Projector and screen. I wouldnt even call it a theater as I rewired the rooms zone speakers as main speakers to a receiver so they can watch movies. The room was wired for a screen and projectos so I sold my client my JVC DLA HD550 and I upgraded to the RS40. I made enough on the bedroom system to pay for my projector and screen upgrade.

Other then that Im doing a lot of surround systems in living rooms....The economy is pretty bad no onecan afford these systems.
Thats why Im trying to get my other "company" division of my main business going so poeple can start to buy better speakers at reasonabel prices and get the idea they can buid a theater they can afford.

www.emavloudspeakers.com

Quick question on your speakers. It looks like you are using a 900Hz crossover on the TPL-150H which has a rated frequency response only down to 700Hz. My limited understanding of ribbon drivers says this is a little dangerous for that driver. Can you describe the crossovers you are using on these speakers? Thanks.

Its not a ribbon, its an Air Motion Transducer/Transformer/AMT....quite different from a ribbon

Very interesting. Thank you. I just assumed it was a ribbon based on the appearance. That's what I get for assuming.

How would you compare the sound of that driver to other types of drivers? Is it more like a compression driver?

Not wanting to hijack the thread - they are quite unique in the way they sound and IMO superior to all compression drivers I have heard (still not heard a very popular brand used here/AVS in high end rooms but I reckon they use the good B&C drivers which I dont mind and have heard but I dont think are as good).

AMT's have an apparent "airiness" about them. "Smooth" is often a word used to describe them. I was shocked the first time I heard one in a relatively modest setting. The ones the OP uses obviously have a wave guide, the ones I use dont but still have excellent off axis response. You can drive them very hard at high SPL with pretty much zero distortion. They're also known for the best transient response around.

IT8K_LMS18.I-Tech Series.zip 16k .zip file

BEF I've attach my iTech 8000 device file that I use for a pair of TC LMS's.
I spent hundreds of hours fine-tuning these settings to get maximum performance out of this amp/sub combo.

This was made with SystemArchitect version 3.1
All you have to do is unzip it and open it with that, and upload it into your amp, and set it to preset #3 LMS-18.

Technically it is optimized for sealed TC LMS-U 18's @ dual 1-ohm feed by a DEQ2496, but it should be safe for your ported LMS-R 15's as-is.
You should probably do some light refinement to these values to match closer to your room/sub, just MAKE SURE you turn down the volume because I have it set VERY HIGH (-20db).

There is almost nothing I don't know about these amps if you are looking for an expert opinion.

Here are the settings I have applied to it.





Monitor your amps in/out console to make sure you don't see any red clip lights during loud music.