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What's wrong with my C-notes?

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  • joshshetter
    replied
    Originally posted by Dirk View Post
    For a $100 pair, that's exceptionally good. And there must be some peace of mind knowing that you DID in fact put it together correctly. :-D

    If it's too bright for you, it's too bright, and that's okay. Some people prefer a slight axial downward tilt and waveguide or no waveguide, some rooms just exaggerate some speakers. At the end of the day, there's no shame in using a bit of EQ or treble control.

    It's definitely worth looking into your mic situation, though. I don't know if your Y axis is calibrated, but if you're truly measuring at ~55dB, more drive level is likely warranted.
    None of my measurements are ever SPL calibrated. These guys are $150 now though, not quite $100. Still great performance for the cost for sure. I will say my preference generally lean towards the harman in room curve, that sounds the most natural to me.

    Leave a comment:


  • Dirk
    replied
    For a $100 pair, that's exceptionally good. And there must be some peace of mind knowing that you DID in fact put it together correctly. :-D

    If it's too bright for you, it's too bright, and that's okay. Some people prefer a slight axial downward tilt and waveguide or no waveguide, some rooms just exaggerate some speakers. At the end of the day, there's no shame in using a bit of EQ or treble control.

    It's definitely worth looking into your mic situation, though. I don't know if your Y axis is calibrated, but if you're truly measuring at ~55dB, more drive level is likely warranted.

    Leave a comment:


  • joshshetter
    replied
    Here's PE's in house measurements, I'm guessing my measurement mic might have some issues? I still find these speakers to be pretty dang bright. I have been wanting to build a three way speaker and I might just use the drivers from this kit, add a peerless sls 10" and work out a xover, although I think I might need a new mic.

    Red trace is my speaker, mic was 1m away pointed on axis according to PE. I had it a little overstuffed so I lost some output on the woofer, I am also not using the stock port length at the moment. Makes me want to pull some extra stuffing I have in a few other projects I have that might be overfilled.

    Thanks PE folks, Chris, Andrew, and Doug for spending your time to help me on this one.

    Click image for larger version  Name:	image002.png Views:	0 Size:	12.2 KB ID:	1490657

    Leave a comment:


  • joshshetter
    replied
    Dropped one cnote off at PE, figured it was going to be the easiest way to figure out what's wrong, be it speaker or measurement setup. Store staff is always a pleasure to interact with.

    Leave a comment:


  • DrewsBrews
    commented on 's reply
    I think you misinterpreted what I was saying. I've just not heard of the 90deg thing being a norm.

    I design the speaker response to be level when the mic is pointed directly at them. Yours are showing the rise when the mic is pointed directly at it. If they sound bright but measure flat when the mic is at 90deg from the speaker then that tells me that is not the correct method of measurement. Trust your ears to tell you which measurement is more accurate.

  • joshshetter
    replied
    Originally posted by DrewsBrews View Post
    I point my mic directly at the drivers and the resulting speaker doesn't seem overly dull in the HF after designing them for a level response. Normal recordings sound normal.. Bright recordings still sound bright.
    I wasn't really getting that at all, everything sounded very, very bright. When compared to some genelec 8030c, the cnote just sounds way too bright, and these speakers should both be pretty neutral. They sound like if you made a speaker with the tweeter too loud. I'd still like to drop them off at PE and see what they say. Can always just use my classix II in the meantime.

    Leave a comment:


  • DrewsBrews
    replied
    I point my mic directly at the drivers and the resulting speaker doesn't seem overly dull in the HF after designing them for a level response. Normal recordings sound normal.. Bright recordings still sound bright. Maybe I'm bright sensitive. Every photo I remember seeing has the mic pointed straight at the drivers/baffle. What am I missing?

    I put the factory files into PCD and am trying to omit parts as if there are bad solder joints somewhere. The only way I can get a slope as extreme as you are seeing is with all the parts omitted from the tweeter except for one of the 2uf caps in series.

    Click image for larger version

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  • joshshetter
    replied
    Thanks for the verification on the tweeter, looks pretty damn consistent. Mine measure pretty much identically. So this just makes me wonder, was the speaker intended to be this bright?

    I went ahead and tried the filter RPB suggested, pretty much fixed the brightness for me. These are both with mic pointed straight at tweeter. Blue is without filter. Sounds much more tonally correct now, no more need for digital filters to tame the top end.

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  • Chris_Perez
    replied
    Originally posted by joshshetter View Post
    Hey Chris, I don't think your images are loading in your comparison post of new and old tweeters.
    Thanks for the heads up. Not sure what I did wrong there, lol... but it should work now.

    -Chris P

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  • rpb
    replied
    For a few bucks, you could add the notch filter I suggested in post #26.

    Leave a comment:


  • joshshetter
    replied
    Hey Chris, I don't think your images are loading in your comparison post of new and old tweeters.

    I took these outside yesterday just to get the room out of the equation. I live close to a highway so it can be hard to get really accurate results. I do find that the speakers are quite annoyingly bright in my decently treated room, I find them effectively un-listenable without -4db HF shelf starting at 7500khz. I have them positioned about 2" from the rear wall. Perceptually what I hear seems closer to the Purple trace below and not so much like the orange. Not sure if I just have a very strong preference for reduced HF energy or not. I've got to pick up some horns from PE so I'm not opposed to dropping off a speaker to test anyway if my listening impressions seem off.

    Orange - mic 90 degree
    Purple - mic straight at speaker
    Green - Raw tweeter mic 90 degree

    Click image for larger version

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  • a4eaudio
    replied
    If it's your measurement setup maybe you should describe that in detail. My first time measuring I had a laptop that had some kind of audio processing I could never override (it was a work laptop and I didn't have all the admin rights I needed). I spent weeks trying to measure and kept getting really odd results until I tried using my wife's Mac Book.

    Leave a comment:


  • Chris_Perez
    replied
    Originally posted by joshshetter View Post
    Hey guys, hope everyone has a good weekend, mostly just rain here.

    I was about to run a c-note up to PE, wanted to measure again just to make sure they're still wonky. I 'm wondering if my results could be from my measurement process. I noticed I got a big HF tilt when pointing the mix on axis vs. at the ceiling. I'm thinking this might have been my fault all along, whoops.

    Orange is pointed at ceiling, teal is pointed at tweeter, taken in room.

    Click image for larger version

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    Now that is more like what I would expect.
    I think you are on the right track.

    -Chris P

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  • Chris_Perez
    replied
    Originally posted by joshshetter View Post
    Thanks so much Chris. I'm hopeful we can figure it out.
    Hello Josh,


    I went ahead and took measurements of the ND25FW-4 tweeter and there has been pretty much no significant change between the golden sample (from 2015) and our current stock (manufactured in 2022).
    Here is the results of the measurements:
    Red = Golden Sample (2015)
    Black = Unit from 10-2019 stock
    Blue = Unit from current stock
    Click image for larger version

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    ‚ÄčIt is doesn't appear that the issue is caused by the tweeter.
    Attached Files
    Last edited by Chris_Perez; 09-07-2022, 10:31 AM.

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  • billfitzmaurice
    replied
    You don't have to point the mic at the ceiling but it should be aimed 90 degrees off-axis. Aiming at the ceiling does that, as does at the floor or to either side, or any of some 356 other one degree increments of rotation. Just as important is to take measurements outdoors, so that you're only measuring the speaker and not the room.

    Leave a comment:

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