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Samps

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Samps last won the day on June 13

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About Samps

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  1. Samps

    Samps DS21 Build

    Forgot to update this thread. Sub has been up and running for a while. Turned out exactly how I wanted it to. Subjectively I'd say it sounds better than my previous diy subs at the same spl. It can dig low enough but still has that impact that seems to be missing with some of the high excursion drivers. Good all around performer. Currently it is firing directly into a corner. I spun it around to get a pic. Sweep is at mlp with no eq other than the hpf bw12 @20hz. 6th smoothing. Pretty good response to start with before any eq. Thanks for all the help guys! Learning to take impedance tests has and will change all of my current and future builds.
  2. Samps

    Samps DS21 Build

    Minor update: It's black now. Hopefully making noise soon.
  3. Samps

    Samps DS21 Build

    Lol, that desk is not stable at all. Cheap IKEA type construction. I added some braces to it just so I could make it useful, but I wouldn't call it stable in any way. Maybe I'll try sitting it on the floor. I'm also planning on making my own grill for this, since nobody makes a damn 21" speaker grill. I guess all the pro audio guys using these either have them in horns or make their own grills. So, question is, how much clearance should I leave above the surround?
  4. Samps

    Samps DS21 Build

    I ran the slowest sweep REW allows and the result was exactly the same. Not sure where that waviness comes from. It didn't show up in any of my tests of other speakers around my house. Possibly still some air leaking out, I didn't use any gasket material under the driver since this is still under construction. I'm pretty confident this is working out as planned, so I'm going to move forward with sanding and paint. It won't be a show piece, but decent anyways. Thanks for all the help!
  5. Samps

    Samps DS21 Build

    Looks better screwed in and standing up. The trace has more wobble in it, but the impedance minimum came down to 21.27hz. And the lower peak is a bit higher and sharper. Also added a comparison between unscrewed laying down and the screwed standing up.
  6. Samps

    Samps DS21 Build

    I thought the peaks would only be the same height if the tune was at the drivers FS? Winisd predicts similar lopsided peaks as I'm getting, but the lower peak is not quite as bad. Hopefully it all works out once I add screws and stand it up.
  7. Samps

    Samps DS21 Build

    Thanks, I'm going to put in a few screws tonight, and test it upright to see if that changes things.
  8. Samps

    Samps DS21 Build

    Took a impedance sweep. Looks like it's currently around 23hz. Not sure if that might change once the driver gets broken in? It may shift a little lower when the cab is standing upright. It's currently laying on its back because I didn't want to screw in the driver. Once it's standing up, the port may act a little longer since it's on the very bottom. I was hoping for a little lower but not sure if I want to mess with it. 22hz in the model works out pretty well with the inukes 20hz HPF. Adding length to the port isn't a problem, I left myself plenty of room to extend it. I did add the corner deflector in the back corner, but didn't get the impedance test of the before and after.
  9. Samps

    Samps DS21 Build

    Yeah, that's what I was thinking. Now that I can do the impedance test ( thanks Mike ) I feel like I can test things and make useful decisions. I doubt it will make a big difference unless I'm pushing things pretty hard. But it's simple enough to try.
  10. Samps

    Samps DS21 Build

    Test from a random htib speaker.
  11. Samps

    Samps DS21 Build

    Would there be any benefit to adding a deflector to the back corner of my port? Currently there is a pretty big difference in volume of that corner vs the rest of the port.
  12. Samps

    Samps DS21 Build

    I built and sold two THTs that were never finished. I figure you have to test it before you spend all that time finishing, but then it never gets done. My impedance jig isn't working correctly. It will make a sweep but the level is super low and the graph doesn't look anything like what I've seen before. Pretty sure I built the jig correctly, but not sure I'm using the correct settings in REW and or computer. Been testing a little bookshelf for practice.
  13. Samps

    Samps DS21 Build

    About half way done with my ported DS21. Thought I'd share some pics. 23.5 x 23.5 x 49.5. = good use of ply. 13.4 internal -1.0 for port -.5 for driver -.15 for bracing = about 11.75 net cubic feet port is 8 x 8. Length is a guess at this point. It's 22.75 in actual length, but the effective length I'm sure is going to be longer. Hoping for 20-22 hz. I built a jig to measure, but can't get a good reading yet. Going to be painted. Bridged on a 3000dsp.
  14. Samps

    B&C 21DS115

    Awesome! 12 is perfect for the space I have. Even if I have to cut a bit down low, that should only help the amp.
  15. Maybe a basic test method that could easily be repeated by anyone with a decent mic and REW. Must be outside. Mic at 1m. Take sweeps until compression shows up. Sort of like what lilmike does. I don't think most people care about the 1w/2.83 numbers. Max output is really the only thing anyone seems to care about. Can your graphing software import REW files?
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