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  1. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    My mistake, I got you mixed up with 'terryo'. I have a habbit of only paying attention to the first few letters in a persons name and for some reason I thought you were him. What do you mean studio type stuff? I'm largely confused by this sentence.
  2. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    P.S. Are you one of the many people who identify as being in Seattle but don't actually live in Seattle? I'm beginning to think I'm the only actual audiophile that lives inside the city limits, lol.
  3. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    I haven't weighed them, but you can imagine 20 2x2's @ 8 feet per unit + the weight of the frame. Mostly because I didn't know what color I wanted them to be. It's unusual of me to question something like this, I usually have it in my head before I start. I was hoping that seeing the finished...
  4. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    I hope you realize that flattery will get you everywhere. :o I know I've worked with square skylines that claim to be PRDs. I can only assume they used a combination of patterns, but I couldn't identifiably say so with out calling the company to verify. I'm not a huge fan of plastic molding...
  5. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Mounted the diffuser, but it's 3" off center. I'll have to stop by the hardware store later to pick up some supplies to adjust the mounts. I haven't finished the diffusers, I still don't know what color or stain I plan to use. In case anyone cared here's a couple images:
  6. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Nothing of what you just said changes the fact that you are still mistaken. Once again, I agree both cutoffs apply. However, this all came about because of the cutoff based on period width. You are saying that the low cutoff of 500hz based on cell depth can't be achieved because the period...
  7. kareface

    How do you audition subwoofers?

    Yeah, she puts out. We can really rock the house when things get heavy.
  8. kareface

    How do you audition subwoofers?

    I personally prefer to do it at dinner. The sub is more relaxed that way and there isn't this tension between us. I try to find out a little about the subs history, her likes and dislikes, where she sees herself in 10 years. I try not to let things like port size or attractive finishes...
  9. kareface

    Sanders Sound Systems - electrostatic

    For the purposes of reproduction I agree. I would like to add that a lot of methods I've seen for correcting LF involves nothing short of the abuse of mids & highs, I always try to avoid this route with the rooms I design.
  10. kareface

    Sanders Sound Systems - electrostatic

    I really enjoyed your post Angela, it was a good read. Now that I'm home and have a little more time to focus, I would like to add my 2 cents. I've noticed a trend of high directivity and pinpoint imaging in a lot of commercial speakers. To achieve this you usually require a thin front...
  11. kareface

    Which subs are you using for your HT system.

    I have two F15 servo-subs from Rythmik. I think they make one of the best drivers for music reproduction in their price range, and the 15" models work well for HT use. They will also sell drivers and amps independent of cabinets which allows you to build your own if you have the tools and the...
  12. kareface

    Sanders Sound Systems - electrostatic

    Narrow dispersion will only help till around 500hz. You can never escape room acoustics, lol.
  13. kareface

    Multiple Subwoofer Placement

    Well, the room is likely undertreated. However, it's hard to say for sure what the problems with the subs would be looking at speaker measurements, lol. You can see the influence of the room in the graph, but the subs could be exciting a different set of nodes reletive to the listening...
  14. kareface

    Multiple Subwoofer Placement

    Flat response only stays flat for a moment. It's good to have the initial production at the right DB level, but keep in mind after that point decay takes over. People get too focused on the FR, and overlook a much bigger picture. Decay is what causes the ringing and masking which impact...
  15. kareface

    Multiple Subwoofer Placement

    In the bass region FR means very little. Decay plays a much greater roll. The lower you go the longer the sound presence has to be to localize. It's a myth that you can't localize LF, it just takes longer for you to do it. The length gets long enough the lower you go that it takes too long...
  16. kareface

    Tools for room measurement

    When you say with calibration files, are you talking from the manufacturer, or from a lab? What range was he testing? Once you get too low, there will always be a large degree of variability. How did he eliminate external factors?
  17. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    You'll be able to see the results if you run all 3 tests that I mentioned. Even a simple polar response will give you a good idea if it's beneficial. I would question this, but I'll get into the details of that in a moment. I understand the mathematical principle behind it. However, if you...
  18. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Exactly that. I'm building an array of diffusers that alternate with broadband absorption every foot and I wanted the some degree of modulation in the dispersion. When I do calibrations one of the things I test is for autocorrelation in rooms where there is a large amount of diffusion, I...
  19. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Here's a question for the AE's out there. I've been reading through the patent on the 2D primitive root diffuser. Unless I'm mistaken the formula does not require the least primitive root and seems to work with any primitive root. I suspect the creator of the calculator used the least...
  20. kareface

    Best place for an audiophile or videophile to live?

    I've worked all over the US and I can categorically say I love living in Seattle. I would like to correct the notion that it snows a lot here, because it really doesn't. It rains more than other places, but we generally don't get heavy rain. It's frequent, but light most of the time. That...
  21. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Ah, if you have Bad Arcs on the side walls that might explain some of the problem. Starting at around 1000hz the absorption of those panels becomes less effective. You'll still get some scattering from the diffusing surface but above that you are sorely lacking absorption. The other problem...
  22. kareface

    Puget Sound Speaker Contest 2010!

    "If you are anywhere in the Pacific Northwest and have any interest in speakers, this event is a bash. Nobody ever regrets coming and Terry does a bang-up job of running a blind listening panel to judge all the speaker designs. You don't have to worry too much about getting skunked because Terry...
  23. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Glad we're on the same page :) I've worked with them over the last year quite a bit and had a chance to hear them in various situations. When you do anything DIY you must accept the possibility you'll do it wrong. It's one of the reasons people who build their own hardware really need...
  24. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Sorry about any confusion, I felt like the other people who read the thread (or clones of it elsewhere) understood what I was getting at so I didn't realize there was any misconceptions generated by the way I presented the information. I'll try to parse my words better in the future. From my...
  25. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    Sorry if I was mistaken, it just seems very 'in your face' to me for some reason. Yes, but that's only if I base the design strictly on the 8x8 pattern. If I use a pattern that produces a near match and only removed one of the columns it'll produce almost identical results (or so I'm told). I...
  26. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    I'm not sure why but your post seems oddly aggressive. It might just my interpretation but I don't see any reason to be. The math for the PRD's wouldn't be changed, I would just be removing a column. I don't think the reason why the structure has to be 8x8 has any impact on the question so I...
  27. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    I've noticed this problem as well, this is why the X's in the matrix above are dampening. I was fortunate enough to hear a room with small diffusers and absorption alternating every foot and it sounded much better than strict rear diffusion in the same space. The pattern wouldn't be...
  28. kareface

    64 Cell (8x8) PRD (Skyline Diffuser) question

    I prefer the scattering on the PRD's over the QRD's, but the dimensions I have to work with won't factor into a traditional PRD. For one reason or another it has to be 8 rows & 8 columns. I was thinking of generating one that's a little larger and just clipping off the extra cells. I know...
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