• 11-05-2007, 01:48 AM
    jim goulding
    Fellow Members at Audio Review
    With your permission . . as it’s you I want to reach and not passers thru, I want to keep this in the context of a forum if that can be permitted.

    I manufacture a passive product based on my personal experience. For those of you who listen with traditional box speakers with surface mounted high frequency drivers, it is designed to remove early reflection from your speaker baffles. The early reflection of sound waveforms shorter in length than your speaker cabinets is mixing in at your listening position out of time with the primary signal propagated by your tweeter. This is causing a smearing of the original event as it was recorded and your system is capable of reproducing regardless of the money you have invested. More importantly, because of the money you’ve invested. What I make removes this by damping the offending area adjacent to your tweeters and absorbing this interaction. Wanna hear what’s really in those grooves and bits? Think you are? That’s what you can discover for yourself.

    Some speaker manufacturers, but not all, address waveform behavior in a variety of ways to include the use of what I am making available as an aftermarket mod or by making their enclosures narrow, canting the sides, or mounting them in modules outside of the box. In effect, that’s what you would be doing with my mod. Remove early reflection and you will get more truth about your system and recordings and insight into the music you listen to. Have no fear, we’re talking better, not worse.

    Thus far, I’ve fitted for Mission, Vienna Acoustic, Von Schweikert, Opera, Spendor, Harbeth, Omega single driver, Dynaudio, Merlin, VMPS planer, Epos, Meridian, Revel, Odyssey, PSB, AV 123, Acoustic Zen, and JM Lab speakers and even replaced some on a Dunlavy that came from the factory.

    Things are going to be revealed more truthfully, naturally, and dimensionally in your space to include the space itself as captured by the microphones(s). There is no change to the fundamental sound of your speakers save for maybe a commonly reported improvement in tone and sweetness in your treble, which you may treasure and I respect, just the recreation of what your speakers and everything that precedes them are capable of delivering.

    For those of you with the room to place your speakers in a manner to recreate proper stereo and for whom this mod is intended, this is a tiny investment for what you are going to get. This is your member rate: $29.95 per pair (so long as there isn't too much custom work involved). That's down from $49.95.

    I INVITE YOU TO EXPERIENCE FOR YOURSELF.

    Jim Goulding
    diffractionbegone.com
  • 11-05-2007, 12:59 PM
    dingus
    1 Attachment(s)
    Jim,
    can you custom fit for tweet and mid in this configuration?
  • 11-05-2007, 01:36 PM
    topspeed
    Hey Jim,

    Thanks for sharing!

    My VSA VR-1's come with anti-diffraction foam built into the grille for the tweeter. Is your product to be used in conjunction with the grille or is your tweak specifically for speakers either with the grille removed or where none is provided (i.e. Audio Note, Totem)?
  • 11-05-2007, 03:17 PM
    jim goulding
    Ding- Are those felt dots on your tweeter mounting plates? Good for you. Are your speakers three way? What is the crossover frequency from the larger driver on the bottom to the dome above it?

    You're welcome, Top. Either. I've fitted inside of grille frames and naked surfaces such as Totems and Audio Notes. I think those two brands, regardless if they are floor standing or stand mount, would benefit tremendously from the addition of my thing.
  • 11-05-2007, 04:50 PM
    RoyY51
    Jim...
    Two questions: what exactly are these mods (perhaps a pic or two?) and do you have a sizing for Monitor Audio B2's?
  • 11-05-2007, 05:00 PM
    jim goulding
    Roy- Greetings. Visit my website- www.diffractionbegone.com- for some pics and a few industry and customer comments and listen to a little interesting music while you're there. I will look at Monitor Audio's website for your model. If it is no longer being made, then I may have you give me some measurements.
  • 11-05-2007, 05:38 PM
    enrique
    jim, i'm wondering if these would benefit someone like me who cant do any room treatments(wife).I have System Audio sa1750's,sa720av and sa505's as my surrounds.These speakers are not that well known from what i can tell.
  • 11-05-2007, 06:23 PM
    jim goulding
    Henry- In the frequency range under consideration, less energy will be hitting your side walls because it will be absorbed by the surrounds before it can get there. A benefit that I have yet to mention, and one totally unintended I gotta admit, just dumb luck and due to the mass of my design, I suspect, is a smoothing of peaks and valleys between 2500Hz and 10kHz in the frequency domain. This has been shown to me by customers using Dynaudio Special 25's and some GR Research monitor speakers. Can you give me a picture of your speakers? Measurements?

    I got a review by a customer just this afternoon. I'm so impressed with his comprehension I've asked for his permission to put it on my website. I'm gonna post it here, too, if he will give me his permission.
  • 11-05-2007, 06:46 PM
    RoyY51
    Jim...
    I tried to access your website and all I got was the dreaded "server not found" message. I don't know if this is a problem with your website or a product of my virus-ridden, thrice-damned, infinitely frustrating, s**t- eating antique computer. Any chance of posting some photos on this site?
  • 11-05-2007, 07:39 PM
    jim goulding
    Roy- I can relate. Check my avatar in a few minutes

    The surround is composed of high grade wool felt and is 3/8" thick. It attaches with postage stamp size Velcro tabs that will not leave any residue on your speakers faces if you should want to remove them for any reason.

    (later) I had the same problem. It may have something to do with AR. Use your search engine.
  • 11-06-2007, 01:37 AM
    dingus
    Quote:

    Originally Posted by jim goulding
    Ding- Are those felt dots on your tweeter mounting plates? Good for you. Are your speakers three way? What is the crossover frequency from the larger driver on the bottom to the dome above it?

    those dots around the tweet and mid are plastic tabs that the acoustic insert would attach onto, similar to the barbed side of a piece of velcro. the speakers came standard with inserts, but the inserts for mine had been lost well before i acquired the speakers. they are circa 78-81 Acoustic Research AR9, four-way speakers (dual 12" woofers in the bottom of the cabinet). i have no idea what the crossover point would be on any of the drivers. here's the schematic ...

    http://www.sound-thinking.org/index....t=0&#entry7306

    measurements for the inserts:
    mid - 8 3/8" x 5 3/4" with a 4" diameter center. (slightly rounded edge around the center).
    tweeter - 4 7/8" outside diameter, 2 1/8" diameter center.
    notice the taper of the silver ring around the mid. the center of the insert for the tweeter should be tapered in the same way.
  • 11-06-2007, 03:18 AM
    enrique
    Quote:

    Originally Posted by jim goulding
    Henry- In the frequency range under consideration, less energy will be hitting your side walls because it will be absorbed by the surrounds before it can get there. A benefit that I have yet to mention, and one totally unintended I gotta admit, just dumb luck and due to the mass of my design, I suspect, is a smoothing of peaks and valleys between 2500Hz and 10kHz in the frequency domain. This has been shown to me by customers using Dynaudio Special 25's and some GR Research monitor speakers. Can you give me a picture of your speakers? Measurements?

    I got a review by a customer just this afternoon. I'm so impressed with his comprehension I've asked for his permission to put it on my website. I'm gonna post it here, too, if he will give me his permission.

    Cant take a pic. sorry.But they do have a site with all the measurements.Dont know how to post link.
  • 11-06-2007, 03:20 AM
    jim goulding
    dingus
    Now I recognize those bad boys. Should have looked at your signature, then I would have known. So, both of those domes cover the frequencies above you mid/bass. On the larger dome, I see that raised ring. Please measure the diameter of the actual ring for me, not the diameter of the plate. Thanks.

    ENRIQUE tambien- I don't know how myself, but if you will just give me the name of the site and tell me where to go on it if need be, I will use my search engine and go from there. Thanks.

    ROY- I found the BR2's. Is that the same? This, or similar, would be a good candidate because of the size of the offending area adjacent to your tweeters.
  • 11-06-2007, 05:03 AM
    enrique
    I usually find it by google.there is also info in a hometheatermag review.
  • 11-06-2007, 08:34 AM
    jim goulding
    Enrique
    I found them. I propose that we fit for the 1750's and you audition them in stereo. If you agree and wish to purchase with your guarantee go to my website and on the second page there is an order form. Complete and submit. That will be a record for both of us. Once you've submitted, arrow back to that page and click on the "Quotes/Pics" tab and on this page along with some pics and industry and customer comments you will see a BuyNow buttom. Click on this and a PayPal screen will appear where you can pay by PayPal (no fee) or credit card. Include $1.84 for postage. Your cost for the pair is $29.95 plus postage. Your 1750's are about the width of my own speakers, by the way.
  • 11-06-2007, 09:39 AM
    dingus
    Quote:

    Originally Posted by jim goulding
    ... On the larger dome, I see that raised ring. Please measure the diameter of the actual ring for me, not the diameter of the plate.

    the 4" diameter was taken from the ring.
  • 11-06-2007, 04:31 PM
    RoyY51
    Jim...
    The BR2's are the next generation of the B2's. They look similar, but I don't know if the measurements are exactly the same. All I can find online are W/H/D measurements. If you can tell me exactly what measurements you need, I'll do it myself and forward them to you.
  • 11-06-2007, 11:04 PM
    jim goulding
    Rob Roy- Can you tell me if the tweeter is in the same relationship distance wise with the mid/bass driver. BTW, I've sold the first pair to an AR member today using a very skinny cabinet. Skinnier than my own. He'll have delivery in 5 working days and I'll see if he might be willing to post his impressions. Here's a review from a customer I got yesterday. I ain't dyeing em, dammit, but I can instruct anyone who wants to how.

    "I've had my diffraction begone wool surrounds on my GR-Research Paradox 3's for a couple of days now and can report my evaluation. The improvements are really very impressive. Imaging is improved; as others have said, the speakers truly disappear now, and the change is quite dramatic. But I have to say that I'm even more impressed with the improvements in tone and clarity from the mid-range on up. Mids and highs are significantly sweeter and clearer, and tonal shadings and nuances are more evident. In other words, I'm hearing a more musical presentation, and this, to me, is even more important than the rather impressive improvements in imaging clarity. People sometimes speak of making a change that suddenly gets their system "dialed in" right, where everything snaps into place. This has been my experience with the wool surrounds: suddenly everthing improved, across the board. Like Satfrat above, I've spent way, way more to get this kind of an improvement. My only complaint is that the wool surrounds are not exactly pretty; if they came in black they'd blend in to nice looking speakers much better. In spite of that, they're staying on, as the improvements they bring make them a no-brainer. My system: Vecteur D-2 transport-->Altmann Attraction Dac-->Don Allen custom tube linestage-->Nuforce 8.02 mono's (tweaked out)-->GR-Research Paradox 3's. Ancillaries: various power conditioners; VH-Audio cottoned silver IC's & CheLa speaker cables; everything on sandboxes with appropriate custom footers, on a custom stand). The Paradox 3's have Focal inverted-dome titanium tweeters.". Charles Epps, KA
  • 11-09-2007, 09:22 AM
    jim goulding
    I hate to see this thread die. I've been using my thing for 6 months now and I am transfixed to my music in ways I have never experienced. My stage, the instruments that populate it, and my system have never sounded more whole, natural and real. LOL. jim
  • 11-10-2007, 11:25 AM
    jim goulding
    A little enlightenment . .
    If any of you would like to see some ongoing conversation about the use of my product visit Audio Circle, and under Industry Talk, search out New! diffractionbegone reviews.
  • 11-10-2007, 01:32 PM
    dingus
    Jim, did you get the pic's is sent via PM?
  • 11-11-2007, 03:33 PM
    jim goulding
    No, brother, I don't see that I have. jim
  • 11-24-2007, 10:11 PM
    jim goulding
    "Hello Jim:

    Here are my comments.

    With the felt tweeter surrounds, there is less smearing of the sound; in orchestral music, individual instruments can be heard distinctly rather than blending into an amalgam of sound. There is definitely more depth to the sound stage and more hall ambience as well.Rather than a sound stage laterally restricted about each speaker and the virtual center, the felt tweeter surrounds produce a soundstage width that is more uniform and panoramic. My preferred room curve using a 1/3 octave RTA/equalizer previously required a roll off of 1.5 db per octave between 4KHz and 10KHz to avoid a brittle treble. With the felt tweeter surrounds in place, I find the room and my ears tolerate a flat response in that frequency region. This relative frequency boost may also contribute further to the perceived improvement in the size and depth of the soundstage."

    Irv Bloom

    (Transposed from an email, ya'll are so reticent here. The "brittleness" in IB's treble is the intrusion of early reflection. Nothing else is missing- Jim)
  • 12-13-2007, 12:48 AM
    jim goulding
    More reviews/more info
    Other ongoing reviews for your trying this for yourself. At your price, or at 4X your price, this is the highest return of investment in audio for box speaker owners:

    “Somewhat instantaneously. BAAAMM, the Lorelei's were gone and I went from the middle row of my concert hall to like the 1st row. There was just more focus & more treble attack and even tho there was a deeper soundstage being created, the added focus drew me closer to the singer. The tweeter is much more defined now with a sharper clearer treble.”

    Robin Bomnard, VT

    “That is exactly what happened to me when I put the surrounds on my speakers, they just sort of disappeared, imaging improved with much more focus and depth. High end tone improved as well, my tweeter sounded sweeter.

    For those coming to the Nov rave you will get a taste first hand at what I mean.

    I love this product, an affordable tweak that works!”

    Mike Mattera NJ

    “I've had them on my speakers for about a week now and have logged about 3-4 hours dedicated listening each night. I used neoprene rings for a couple of years and have GIK panels at my first reflection point. The improvement over the neoprene rings is subtle but worthwhile. Clearer, more coherent imaging. A bit more upper frequency detail. Improved imaging wide of the speakers. Not a major revelation in my case but a very nice refinement, easily worth the cost. Only negative is appearance. The neoprene rings blend in with the tweeter face while Jim's product does not.

    It's a good product. The cuts are smooth. Jim does a good job. Could use a couple more Velcro tabs IMO but those can be easily found. If you have no first reflection treatments you should realize a much greater benefit.”

    Jim Nancarrow, CA

    “Hi: I received my wool surrounds yesterday and I installed them right away and I did notice a difference for the good with everything "cold" at a low volume. Today I let everything "warm-up" for a few hours at low volume and then I did some serious listening. I never listen at a loud volume when all my gear has been sitting in a 64 degree basement listening room without warming things up, especially my integrated and speakers! I must state up front that I could never really explain the difference between lower mid-range and upper mid-range as far as my hearing goes, or most other terms used, but I do know what I like and I like these wool surrounds! These things are the real deal and probably the first thing that I have tried that doesn't need a "burn-in" for X number of hours!. Everything seemed to open up, better sounding highs and there seems to be more "bottom-end". I am using the surrounds with PSB Goldi's. I am using a powered sub to give the Goldi's a little bit more bottom, not that they need it and I had to back off on the gain a touch! I can't speak for others, but for me I know what I am getting right away, not like the clocks, stones, etc,etc,...Yeah you know what I mean. You should be able to hear a difference for the "good" right away!!! As they say...YMMV! The best money I have spent so far!! Later. Huck ”

    Keith Huckfield, Ontario, CAN

    This one is from me . . your stage and the realization of instruments and vocalists within it will be more real in your room and transparent to the source as best your system is capable of rendering it. Never better. For more information and the source of an independent audio publisher's review, visit www.diffractionbegone.com. Your AR price is $29.95 per pair plus shipping. Thanks. Jim