[95bcwh]

At $50k a pair ! 

"Stereophile Class-A Restricted Extreme LF" speakers.

Nice.. never thought that I would know someone who own such an elusive speakers! 

joamonte,
  It's a nice listening room that you have. I must try some of these diffusor stuff once I move into my new house when I have a bigger room to work with..

  What speakers are those in your pictures?

  barry

The speaker is Marten From Sweden.

http://www.stereophile.com/loudspeakerreviews/205marten/

 

[nathanm]

Wow joamonte, now THAT is a proper shrine to worship the audiophile gods!  Might be small but it's very impressive!  The lighting really seals the deal too.  If there's one advantage to small rooms it's that a person can more easily implement 100% treatment coverage which then makes for a more complete look.

[95bcwh]

Joamonte,
  When you said "I like the effect of a diffuser at the centre of loudspeaker", do you mean placing a diffuser  at the center between the two speakers, so that your left speaker, diffuser and right speaker form a straight line? Or the diffuser is slightly behind?

   barry





 

[joamonte]

Joamonte,
  When you said "I like the effect of a diffuser at the centre of loudspeaker", do you mean placing a diffuser  at the center between the two speakers, so that your left speaker, diffuser and right speaker form a straight line? Or the diffuser is slightly behind?

   barry

Hi I would perfer it to be behind the loudspeaker..

Basically I follow the concept of RPG CineMusic and F.Alton Everest's book concept.

http://www.rpgdiffusors.com/products/cinemusic/cine01.htm

The Abffusor of RPG in the link is actually Owen Coning 705 arranged into QRD Diffuser pattan inorder to diffuse/scatter little of the reflection sound during absorbing.. 

Which mean for back wall behind speaker ~~left 1/3 absorb,centre 1/3 diffuse, right 1/3 absorb..

BTW all Diffuser product in my room is make by my canpenter after I draw the plan to him, very cheap,less then 1/4 of the oringinal RPG price...

Oringinal RPG diffractal



My clone..





http://www.rpgdiffusors.com/products/diffractal/index.htm

The room is mostly DIY by myself (pianting ,lighting , power cable,Sound isolation Door,installation of the bulky Steward Motorice Projection screen, DIY remote masking system,Projecter installation... ...etc)...even the a pair of giant foam basstrap at the ceiling and 4" foam panel on wall I find a local foam manufacter follow the Oringinal Aurulex LENRD foam's density to make and cut....so the total cost of the room is about USD $3K only.... 



Some measurement I done 1/2 years ago in the early stage of experimenting all type of room treatment in the new room....now the measurement is much better but I still didnt have time to upload into internet.

Water fall of time frame at 600 msec


FR....."Restricted Extreme LF"?...mnnnnnnn...


 
 

[95bcwh]

Joamonte,
  Your clones looked as good as the original

  Did you really go all the way cutting up OC 705 into bits and pieces to make the diffractal? That's serious job man!!

  barry

[joamonte]

The "Abffusor" which for Absorbing purpose is make of OC 705..

The "Diffractal" which use for Duffuser is make of Plywood or MDF or Chipboard or Timber....

Seem like in this acoustic forum member are quite unware of RPG product ...

[95bcwh]

The "Abffusor" which for Absorbing purpose is make of OC 705..

The "Diffractal" which use for Duffuser is make of Plywood or MDF or Chipboard or Timber....
Seem like in this acoustic forum member are quite unware of RPG product ...

I just got into this hobby less than 6 months.. so pls don't stereotyping the whole community.

Also I know from the outset that I don't have the luxury (room constraint + I'm in a temporary rented property) to go for diffusor type of room treatment so I didn't do as much research on this topic as I did on the absorption type.

Yes I'm ignorant, but it doesn't mean that all the members here are ignorant.

[8thnerve]

Joamonte,

Your response graph looks typical of a room with a high amount of acoustic distortion, albeit with abated irregularities.  Several significant peaks and dips of 8-14db below 1KHz, and an overall high frequency response which is a good 8db or more down at 8KHz and above, with almost no perceived energy (-12+db) above 10KHz.  This lack of high frequency response is almost certainly responsible for the perceived reduction or elimination of echo.

With something that would abate some of the acoustic distortion, you'd see a reduction of the peak and dips in your lower frequency band of several db, and your overall upper frequency response would increase, without bringing echo back.  Of course, with all that absorption, you'll never get it level.  To accomplish that you'd need to start removing the absorptive products like the foam.

Best Regards,

Nathan Loyer
Eighth Nerve

[joamonte]

The "Abffusor" which for Absorbing purpose is make of OC 705..

The "Diffractal" which use for Duffuser is make of Plywood or MDF or Chipboard or Timber....
Seem like in this acoustic forum member are quite unware of RPG product ...

I just got into this hobby less than 6 months.. so pls don't stereotyping the whole community.

Also I know from the outset that I don't have the luxury (room constraint + I'm in a temporary rented property) to go for diffusor type of room treatment so I didn't do as much research on this topic as I did on the absorption type.

Yes I'm ignorant, but it doesn't mean that all the members here are ignorant.

OMG!  I am new to this forum so didnt know who is who, did a scearch in older thread but didnt found much discusion about diffuser and I also didnt aware that you are new in this hobby....My mistake.

IMHO you dont know much about RPG dont mean you are ignorant,I know lot of respective elder audiophile around me cant even answer whats the different between Sound Isolation and Room treatment...

...So I didnt mean anything negative when I say "Seem like in this acoustic forum member are quite unware of RPG product" ..

cool down man..

[95bcwh]

oh.. no worry..I'm always cool....I'm not the type of person that got pissed easily   

I don't know why diffusor are not talked about that much in this forum, my impression is it entails too much efforts for my current situation. But when I move into my new house, yeah, I will take a serious look at it.. Not sure where I can hire a cheap carpenter like you to clone these RPG product though.

[joamonte]

Joamonte,

Your response graph looks typical of a room with a high amount of acoustic distortion, albeit with abated irregularities.  Several significant peaks and dips of 8-14db below 1KHz, and an overall high frequency response which is a good 8db or more down at 8KHz and above, with almost no perceived energy (-12+db) above 10KHz.  This lack of high frequency response is almost certainly responsible for the perceived reduction or elimination of echo.

With something that would abate some of the acoustic distortion, you'd see a reduction of the peak and dips in your lower frequency band of several db, and your overall upper frequency response would increase, without bringing echo back.  Of course, with all that absorption, you'll never get it level.  To accomplish that you'd need to start removing the absorptive products like the foam.

Best Regards,

Nathan Loyer
Eighth Nerve

Hi,I want the roll off HF not to reduce the "ehco" (IMHO My tiny room shouldnt have echo becuase its too small,3 X 4.2 m and too many things inside)...

The HF roll off in the graph is because of some reason,

1)I need that HF roll off because I am sitting too close to the speaker (less than 2 meter),this pair of speaker if you check the Stereophile mesurement you will notice its very directional,slight off axis the high will roll off like snow ball...I did it at purpose not to listen at on axis to prevent the too forward sound when the HF is up .....if you didnt have a chance to listen to the Marten on axis at less then 2 m than you can try listen to Avalon ED or Thiel speaker on axis in less the 2m, I believe you will agree that it is better to have roll off HF than a straight HF response for music listening.

2)I am still new in measurement software that time so I am using a directional Condenser measurement mic pointing at the centre of the 2 speaker instead of average the Left and Right FR on axis....Roll off at HF is expected in such short measuring distance.

And if you have measure in the same way before, you should know even a slight shift at the angle of the directional mic the HF response behave very differently....but I am more concern of the bass respose during that time so too lazy to care much about how accurate is the HF measurement, after some experience now I know to get a correct mesurement on HF I should point on axis to the speaker and average the L/R with my Directional condenser mic.

lastly.....These is the FR graph when I still experiementing different room treatment and their location in room few months ago, I remember I only have a pair of real trap and 8 Aurulex LENRD bass trap that time, so I can tell you the bass response now is much better after I add in a couple of bass trap into the room....

BTW Trust me, I have already tried the 8th nerve product (and Echo buster,ASC) product (without other treatment eg foam/diffuser) in these room before , not much different of bass response (in fact it become worse), after all these is a very very small room (3X4.2m) with 41hz 1st room mode and a quite big speaker (2 X9"), cant expect perfect bass from these room...