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BEF from Norway,DIY Uncompromising Theater - Page 3

post #61 of 169
Thread Starter 
Then it is time for the covers in front of the back channels in the cinema. The idea is to have a simple frame in front of the speakers and pull these frames with speaker grill cloth black.

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Covers for the the back channels are finished and installed


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post #62 of 169
Thread Starter 
Time to build rack for the amplifiers and the rest of the electronics will get a good piece of furniture

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post #63 of 169
Very impressive, well done!

Jason
post #64 of 169
Thread Starter 
I was not happy with the sound from my TC sound sub. Then I started a new sub project, this time with Beyma speakers.

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post #65 of 169
Quote:
Originally Posted by BEF-NO View Post

I was not happy with the sound from my TC sound sub.

Interesting, what about it dont you like? Obviously they have a solid reputation...I've been looking at a variety of alternatives myself
post #66 of 169
Thread Starter 
Quote:
Originally Posted by Elill View Post

Interesting, what about it dont you like? Obviously they have a solid reputation...I've been looking at a variety of alternatives myself

Personally i think TC Sound makes sound very good from 15Hz to 40Hz, but not thet good from 40Hz to 120Hz. So i wanted to find a sub solution that warks better for this area and at the same time going deep.
post #67 of 169
Thread Starter 
I was not quite satisfied with the acoustics in the room. Here are a few pictures from the acoustic testing. There are put up 10 diffusers on 60x60 size that takes from 573 to 3580Hz. there are 6 diffusers behind the sweet spot and 2 at each side standing in the 1-reflection region.

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post #68 of 169
Thread Starter 
For those of you who looked good at the pictures from test of acoustics so i had some sub standing in the back of the room.

To get the best bass respons in the room i will build tow sub to have standing in the back of the room.























post #69 of 169
since when did AVS Forum allowed porn eek.gifeek.gifeek.gifeek.gif

this sir, is a great build and you must be a master artist to come up with speakers that are top notch...... very beautiful... if only i had 1/10 of the skill you had rolleyes.gif

Zammy
post #70 of 169
Thread Starter 
Quote:
Originally Posted by zammykhan View Post

since when did AVS Forum allowed porn eek.gifeek.gifeek.gifeek.gif
this sir, is a great build and you must be a master artist to come up with speakers that are top notch...... very beautiful... if only i had 1/10 of the skill you had rolleyes.gif
Zammy

biggrin.gifbiggrin.gifbiggrin.gif Thanks!!
post #71 of 169
Just found this forum and this cinema thread:eek:
I've got to say: my greatest respect of what you are builing there, absolutely stunning!

BR
Rainer
post #72 of 169
Thread Starter 
Here is the construction of the diffuser to have on the back wall of the theater. I use 2 "x 2" wood to it. Bought approximately 300 meters. There are a total of almost 1000 pieces, all are sanded before they glue on the plates.



































post #73 of 169
Thread Starter 
Then it was time for some new surround channels to fit into the diffusorwall.
















































post #74 of 169
fyi on the diffusers ... use a proper calculator instead of the BBC design (that isn't a true PRD but an array of smaller PRDs) === www.oliverprime.com/prd/

fyi for your next build, the diffusers themselves need to be "large with respect to wavelength".
eg, if you have a design freq of 344hz, then the unit size themselves need to be at least 3.3ft or larger to limit the lower (larger) frequency from diffracting around the diffuser.

also, to be in the far-field of reflection phase gratings, it is best recommended 3x seating distance of design frequency.

if design frequency is 344hz, minimum seating distance: 9.84ft.

looks great!
post #75 of 169
Thread Starter 
Quote:
Originally Posted by localhost127 View Post

fyi on the diffusers ... use a proper calculator instead of the BBC design (that isn't a true PRD but an array of smaller PRDs) === www.oliverprime.com/prd/
fyi for your next build, the diffusers themselves need to be "large with respect to wavelength".
eg, if you have a design freq of 344hz, then the unit size themselves need to be at least 3.3ft or larger to limit the lower (larger) frequency from diffracting around the diffuser.
also, to be in the far-field of reflection phase gratings, it is best recommended 3x seating distance of design frequency.
if design frequency is 344hz, minimum seating distance: 9.84ft.
looks great!

Thanks for the link!! I have read about the diffuser principle, but not seen the calculator before. Now i just want to build new diffusers smile.gif
post #76 of 169
qrdude (free software) is available as well for quadratic residue number sequence... regardless if you stick with primitive root, the tech guide on the qrdude page is still relevant regarding reflection phase gratings: http://www.subwoofer-builder.com/qrd.htm
post #77 of 169
Thread Starter 
Quote:
Originally Posted by localhost127 View Post

qrdude (free software) is available as well for quadratic residue number sequence... regardless if you stick with primitive root, the tech guide on the qrdude page is still relevant regarding reflection phase gratings: http://www.subwoofer-builder.com/qrd.htm

Thanks for the link!!
post #78 of 169
Thread Starter 
Here is the construction of the new subs. I will have 6 subs in the front of the room og 2 in the back. The element i use is Bayma 18SW1600Nd.







































post #79 of 169
eek.gif
post #80 of 169
Fantastic build! Especially all of those speakers, your theater must sound amazing.
post #81 of 169
Thread Starter 
Quote:
Originally Posted by design1stcode2nd View Post

Fantastic build! Especially all of those speakers, your theater must sound amazing.
Thanks, speaker system delivers an unbelievable experience unlimited dynamics biggrin.gif
post #82 of 169
Theater Porn at its best.
post #83 of 169
Thread Starter 
Installation of the projector, it is a Sony VW95ES. The projector is calibrated up in cinema.









Before Calibration



After Calibration












post #84 of 169
Thread Starter 
Here are pictures of how the front wall is constructed.







post #85 of 169
looking awsome smile.gif really nice build.

i have a few questions, how do those large speaker handle midrange, is it the large 15" not slow and sloppy!? i have never hear them im just asking to update my own knowledge about 15".
and why did you opt to put in 15" in the rear sr, if you had put in same brand 10" would you not have got same results as they never play high spl?
Edited by simple100 - 11/22/12 at 4:46pm
post #86 of 169
Just curious did you ever consider an infinite baffle subwoofer.
May have been a lot less cabinets and drivers for an excellent result smile.gif
post #87 of 169
Five cheers for Scandinavia! biggrin.gif
post #88 of 169
Thread Starter 
Quote:
Originally Posted by simple100 View Post

looking awsome smile.gif really nice build.
i have a few questions, how do those large speaker handle midrange, is it the large 15" not slow and sloppy!? i have never hear them im just asking to update my own knowledge about 15".
and why did you opt to put in 15" in the rear sr, if you had put in same brand 10" would you not have got same results as they never play high spl?

Thank you!

These 15 " from Beyma plays very good midrange, but I have some plans to install a 12" midrange from Beyma to get even better performance in the LCR. The reason that I have 15 " the whole layout is for the most similar sound signature in all channels. This increases the performance of the system really!
post #89 of 169
Thread Starter 
Quote:
Originally Posted by JonahBones View Post

Just curious did you ever consider an infinite baffle subwoofer.
May have been a lot less cabinets and drivers for an excellent result smile.gif
I have had some plans around it. I could not get the correct driver i wanted for such a solution. Can i get the drivers i will try it out.
post #90 of 169
Thread Starter 
Quote:
Originally Posted by Nightlord View Post

Five cheers for Scandinavia! biggrin.gif

Thank you smile.gif
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