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3ll3d00d last won the day on May 31

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About 3ll3d00d

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  1. Should I go ported?

    admittedly I haven't reduced the capacity in my system at any time yet but I think I must be at the point where moar genuinely is overkill (at least without changes that allow me to put more subs in the room anyway). I did have a pair of low teens xmax 12s behind me which gave solid response down to ~14-15Hz in the NF position whereas I now have a pair of high xmax 18s so that yields something like 5-6x the Vd. This is quite a large uptick. Admittedly part of the reason is to get a larger radiating area so even that impact across the sofa but it remains to be seen whether my wife appreciates that anyway back to the subject of this thread... I ran some quick tests today to check for port noise, I went to ~112dB (at the LP) with no noise at all & you could just about feel the air if you put your hand on the port. I used REW's CEA-2010 signal for that test at 16, 20 & 25, the only distortion product visible (at that ~112dB level) was 40-50dB down so basically non existent. I'll push that some more another time just to see what happens. I haven't had a chance to properly run through some listening sessions yet so will leave any subjective commentary til later.
  2. Should I go ported?

    atm I have an inuke3000 and an sp1-6000 so I will use the sp1 on the dual uxl at the rear and have the inuke bridged for the 21. Sadly US goods are pretty expensive since Brexit so I doubt I'll get another speakerpower amp, it's probably overkill anyway. I'm not sure what I'll do long term, it depends whether I keep both UXL or not. I have a feeling 2 18s behind me will be overkill (though they make a handy behind sofa shelf) so may end up selling one of them. If so I'd probably look at also selling the speakerpower. The peavey ipr2 7500 seems a reasonable mix of price & power & features, they are about £1300 here whereas an sp2-12000 will be closer to £3k landed. meanwhile, raw in room response https://imgur.com/a/X4Sw0 NF is the one with the big dip in the 20s 21 looks pretty similar to the modelled response
  3. Should I go ported?

    I had planned on the tune coming down a touch from the model based on port location but you know it never occurred to me to think that would also bring the first resonance down too, blindingly obvious now you mention it 0 degrees is about 16.5Hz btw
  4. Should I go ported?

    added stuffing around the edges of the cab to see if the spike was a resonance within cabinet, new curve in orange has that damped down a fair bit so I guess that is what it is https://imgur.com/a/MmYJK
  5. Should I go ported?

    dropped the driver in for a quick test https://imgur.com/a/GtvrX suggests tune is ~18Hz, modelled was ~19Hz I guess that peak at ~110Hz is 1st port resonance? model suggested that would land around 130Hz if so so not sure why that is a way off. Plugged a similar model into tl.app and that does show a peak around that point.
  6. Should I go ported?

    it's fair to say I'm not the fastest woodworker in the west
  7. Should I go ported?

    hopefully installing it into my system this weekend https://imgur.com/a/8nj7S
  8. I notice (in that speaker shootout thread on avs) you commented about certain aspects of your room response being SBIR rather than modal in nature. I was curious to know what you meant by this. I suppose I am thinking of 2 specific question. What makes you say it is SBIR rather than modal? what practical difference has this made to your treatment strategy?
  9. Should I go ported?

    the actual design is like so, ~190L and a tune around ~18.5Hz (assuming my model is accurate)
  10. Should I go ported?

    I've made progress on the cab, the bottom (on the right of the pic) is glued on & am have the rest at the dry fit stage just to make sure it all fits together properly. Obviously that centre brace will have the middle cut out once I get the top of. Bit of a squeeze making this in my shed
  11. (4) Sealed 21": Funk Audio UH-21v1

    I don't think it's fair to characterise those threads as maximum vibration chasing. Obviously there are some people who do that, just as there are people who chase extreme SPL, but mostly it's about finding out how it responds & what feels right/good. There seems a lot of variation on that point, or more specifically, the way people describe what they like seems to vary a lot. It's all about balance in the end.
  12. (4) Sealed 21": Funk Audio UH-21v1

    http://www.avsforum.com/forum/113-subwoofers-bass-transducers/2434250-nearfield-ported-mbm-increased-mid-bass-tactile-response.htmland particularly http://www.avsforum.com/forum/113-subwoofers-bass-transducers/2118090-vibsensor-accelerometer-test-thread.html are where you should find other measurements, not sure how many have been photobucketed though. Generally speaking people have been weighing down the phone with a sack of rice (or similar) to keep the thing under control at low frequencies. This also damps the response above 30Hz or so from what I have measured but does seem to produce a shape to the response that more closely resembles that of a lighter, more accurate and securely attached, sensor. You can avoid this by using such an external sensor. Sitting on the seat does naturally change the measured response. I posted a comparison somewhere on avs at some point iirc.
  13. (4) Sealed 21": Funk Audio UH-21v1

    there's no problem using pink noise, it's just easier to compare measurements when using white. REW does have white noise in its generator, it's listed as "White PN" IIRC. There are a bunch of test signals in https://drive.google.com/open?id=0BxdmSMpV-t3GVzlJcnhYaDJhdmc, they're just REW generated though.
  14. (4) Sealed 21": Funk Audio UH-21v1

    full band pink noise will contaminate the PSD reported by VS because any high(er) frequency vibration will be aliased into the reported results. Use 0-50Hz white noise instead, the signal itself is then a straight line in PSD so it's easy then to see the variation between measured and actual.
  15. (4) Sealed 21": Funk Audio UH-21v1

    Recent versions of REW (as in, the last year or so) have unfiltered noise. If you have an rpi lying around, I recommend using the app I wrote with an offboard sensor for greater accuracy.