PI Audio Group Diffusers

ADD · « **Reply #20 on:** 3 Nov 2010, 02:04 am »

The base was a stroke of genieoso of Daves. They where easy to put up and take down. I will ask Dave who designed built and painted the bases the night before the show if we can snag some. The Diffusers are very easy to install. I use two finish nails per panel for my room.
I have had Daves Diffusers in my system for over ten years and they still work. The new design are even better.
Like Dave says "the room is the most important interconnect"

dBe · « **Reply #21 on:** 3 Nov 2010, 02:15 am »

Quote from: jhm731 on 3 Nov 2010, 01:19 am

Thanks for the picture.

What do they cost?

Does a stacked pair come with a base?

Dimensions?

Sure, pictures that I don't have to take are easy, especially for you - I shake too much for good ones.

Pricing will be released in a couple of days along with the size choices. Basic pricing will be for 23.25" x 23.25" units. The ones that are in the pictures are the 46.5" x 23.25" versions. They are available in raw 2.2lb density EPS (white) as well as painted and sealed/painted versions. Prices start at about $45.00 per matched (cut) pair.

Bases in the pictures were just 1/2" thick MDF. Pricing does not include bases. Our thoughts are to keep the pricing as low as possible and shipping 12" X 24" x 1/2" MDF defeats that premise.

Hang in there, Dan. We'll get the pricing out ASAP.

Dave

jriggy · « **Reply #22 on:** 3 Nov 2010, 03:15 am »

After looking at the supplied pic, I am wondering how they would work placed in front of floor to ceiling, front corner tri-traps (gik). I know all rooms respond somewhat differently but would diffusion placed in this location be effective - and secondly, would these effect the performance of the bass traps at all?

I like the look and sizing mentioned... looks promising for my application.

jhm731 · « **Reply #23 on:** 3 Nov 2010, 06:39 am »

Quote from: dBe on 3 Nov 2010, 02:15 am

Sure, pictures that I don't have to take are easy, especially for you - I shake too much for good ones.

Pricing will be released in a couple of days along with the size choices. Basic pricing will be for 23.25" x 23.25" units. The ones that are in the pictures are the 46.5" x 23.25" versions. They are available in raw 2.2lb density EPS (white) as well as painted and sealed/painted versions. Prices start at about $45.00 per matched (cut) pair.

Bases in the pictures were just 1'2" think MDF. Pricing does not include bases. Our thoughts are to keep the pricing as low as possible and shipping 12" X 24" x 1/2" MDF defeats that premise.

Hang in there, Dan. We'll get the pricing out ASAP.

Dave

Thanks Dave.

Be well!

dBe · « **Reply #24 on:** 3 Nov 2010, 02:27 pm »

Quote from: jhm731 on 3 Nov 2010, 06:39 am

Thanks Dave.

Be well!

Thanks, I really appreciate the kind thoughts. I'm going t be seeing the specialists starting today.

Dave

dBe · « **Reply #25 on:** 3 Nov 2010, 02:53 pm »

Quote from: jriggy on 3 Nov 2010, 03:15 am

After looking at the supplied pic, I am wondering how they would work placed in front of floor to ceiling, front corner tri-traps (gik). I know all rooms respond somewhat differently but would diffusion placed in this location be effective - and secondly, would these effect the performance of the bass traps at all?

I like the look and sizing mentioned... looks promising for my application.

The ABB1 will work very well with the Tri-traps. You could even attach the ABB1 diffusers to the face of the Tri-traps without a performance penalty.

Dave

ADD · « **Reply #26 on:** 4 Nov 2010, 02:48 am »

Hay Dave I want to complain about one of your amigos dmccombs. He called me a Dip switch this morning which I was very offended. I could not go out for a happy meal for hours. Why do some people who are so smart want to push us two digit IQ people around.
Hows the thumb doing by the way??
I really did have a accoustic question for you but ,Oh well.
Igor

TomW16 · « **Reply #27 on:** 4 Nov 2010, 10:00 pm »

My apologies if this has already been posted but I would like to know the thickness of the diffusers. I am thinking about using them at the first reflection points on my ceiling.

Thanks.

Tom

S Clark · « **Reply #28 on:** 4 Nov 2010, 10:13 pm »

The wells on mine range from about 1" to about 3" with the total thickness of the unit being about 4" at the max point.

DTB300 · « **Reply #29 on:** 18 Nov 2010, 04:06 pm »

Any update on the Diffusers being available for purchase?

dBe · « **Reply #30 on:** 18 Nov 2010, 04:35 pm »

Quote from: DTB300 on 18 Nov 2010, 04:06 pm

Any update on the Diffusers being available for purchase?

I'll have sizes and prices tomorrow for the ABB1 series.

Dave

woodsyi · « **Reply #31 on:** 18 Nov 2010, 04:42 pm »

Dave,

Price is fantastic but what is the effective frequency range? How low can you go with that well depth?

HT cOz · « **Reply #32 on:** 18 Nov 2010, 05:03 pm »

Warning Stupid Question:

Dave would these work being placed over my sidwall boxes that have been filled with 4" of Rockwool?

They are ~4' x 7' on both the Right and Left Wall. I am planning on covering them with acoustic cloth. The front wall with have the movie screen, acoustically transparent naturally.

MaxCast · « **Reply #33 on:** 18 Nov 2010, 05:11 pm »

What woodsyi asked and what and when on the "second" series?

jtwrace · « **Reply #34 on:** 18 Nov 2010, 05:18 pm »

Next will be a diffuser tour.

dBe · « **Reply #35 on:** 18 Nov 2010, 05:33 pm »

Quote from: woodsyi on 18 Nov 2010, 04:42 pm

Dave,

Price is fantastic but what is the effective frequency range? How low can you go with that well depth?

When talking design targets for diffusers a rule of thumb is (depending upon who you talk to) multiply the depth of the ABB1 will have a low frequency cutoff of ~ 1kHz. A good calculator for diffuser bandwidth is here: http://www.mh-audio.nl/diffusor2.asp#calcul

The ABB1 is not a QRD style of diffuser, obviously. When working with that style of diffuser, I didn't particularly care for the pronounced comb filtering that could occur depending upon the size of the diffuser. When I designed the ABB1 I had a couple of reasons behind the shape and the material. First, the material itself has the characteristics that I have discussed before. I especially liked the reactivity of the material from the heart of the mids on down and the porosity of the material for HF absorption. I chose the shape of the wells to provide a HF cutoff essentially abouve audibility with a lot of exposed surface area to impinging sound for absorption and HF scattering due to the irregularity of the material. When everything about the diffuser is taken into consideration, the effective bandwidth is from the upper bass (reactivity) to beyond audibility (absorption and redirection).

I guess I should have called this a reactive, absorbing, diffusing, redirecting thingie, but the catchall term of diffuser (used and abused by everyone) somehow made more sense.

I can go into more technical descriptions, but the proof is in the pudding. They work very well. Ask anyone that was at RMAF and heard our room.

Dave

dBe · « **Reply #36 on:** 18 Nov 2010, 05:36 pm »

Quote from: HT cOz on 18 Nov 2010, 05:03 pm

Warning Stupid Question:

Dave would these work being placed over my sidwall boxes that have been filled with 4" of Rockwool?

They are ~4' x 7' on both the Right and Left Wall. I am planning on covering them with acoustic cloth. The front wall with have the movie screen, acoustically transparent naturally.

Not stupid at all. Yes, they will work very well and enhance the LF absorption of your rockwool panels, too. The whole diaphragmatic absorber bit, you know.

Dave

dBe · « **Reply #37 on:** 18 Nov 2010, 05:38 pm »

Quote from: MaxCast on 18 Nov 2010, 05:11 pm

What woodsyi asked and what and when on the "second" series?

There actually are ABB2 and ABB3 panels. They are deeper versions of the ABB1 and really aren't intended for DIY applications, but more for recording studio built ins. They get too cumbersome and expensive to be applicable to us'ns.

Dave

dBe · « **Reply #38 on:** 18 Nov 2010, 05:42 pm »

Quote from: jtwrace on 18 Nov 2010, 05:18 pm

Next will be a diffuser tour.

jtwrace · « **Reply #39 on:** 18 Nov 2010, 05:45 pm »

Quote from: dBe on 18 Nov 2010, 05:42 pm

I knew you would like that idea.