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  • jhollander
    replied
    Older near field

    Attached Files

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  • jhollander
    replied
    What I posted was correctly blended. The only issue could be the near field FRD gating

    Here are the files from 8-16 not modified. Can't find the old near field yet.



    Attached Files

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  • rpb
    replied
    In addition, I'd replace the foam blocks under the speaker with a speaker stand that sits on some blocks. That foam will probably affect the baffle step slightly. That's how I roll!

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  • rpb
    replied
    My post was just deleted as spam, so I'll ask again if Matt has gated frd files for this measurement that have not been corrected, tweaked, modified, in any way. Click image for larger version  Name:	image_80751.jpg Views:	2 Size:	124.6 KB ID:	1419661

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  • Wolf
    replied
    I'm hoping the files Matt posted initially were both on the tweeter axis. That's how I roll...
    Wolf

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  • rpb
    replied
    Originally posted by mattp View Post

    Thanks Ben. What I put in bold were exactly my thoughts for this design. The design I came up with was very similar to his first which was a surprise to me, the main difference being the values for the woofer filter since he accounted for baffle step. He sent me a 4th order with notch and a XO around 3k that I think I will try next.

    Otherwise I will always have that mild panic thought in the back of my head that these will just shatter one day.



    This is very useful info. I might try it to see if I hear any real difference, My ears are only good to about 14k but it's cheap enough to try. And according to my sim you nailed that 1uF value BTW. I have this sneaking suspicion you have done this once or twice...



    I know he accounted for baffle step but he did use his own corrected/blended response using a NF measurement I sent him for everything below probably 600-700 Hz. I did not correct the file I posted earlier in the thread so the phase was probably not accurate. Hopefully John will chime in and shed some light on his reasoning for this. When it comes to proper XO design I don't know what I don't know - so I am all about learning from you veterans.
    Do you have gated frd files from this measurement, that have not been altered, spliced, corrected, etc.? Click image for larger version  Name:	image_80751.jpg Views:	1 Size:	124.6 KB ID:	1419658

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  • Wolf
    replied
    I initially questioned the 4.5mH coil on the woofer as well. That is a pretty large value for a 5" midbass, even when comping BSC with a full 6dB. Mind you, for this type of design, I'd shoot for a Super-Q laminate or a large gauge air-core. I've not played with the files, but I might be...
    Later,
    Wolf

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  • rpb
    replied
    Originally posted by jhollander View Post
    Nope. Maybe you are not use to seeing woofer with baffle step?
    Look again. Here's your posted woofer, and tweeter frd files.

    Click image for larger version

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    Attached Files

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  • jhollander
    replied
    The original files had blended response with gating to 1K

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  • jhollander
    replied
    Nope. Maybe you are not use to seeing woofer with baffle step?

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  • rpb
    replied
    Originally posted by jhollander View Post
    The original files did not have a baffle step blended with the nearfield. Attached are the latest files
    The woofer frd is wrong. It's a tweeter frd. The tweeter frd is also a tweeter frd, but with a steeper roll-off. I didn't look at the others.

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  • rpb
    replied
    Here's a 4th order version.

    Click image for larger version

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  • rpb
    replied
    Originally posted by jhollander View Post
    The original files did not have a baffle step blended with the nearfield. Attached are the latest files
    Wouldn't the on axis, in box measurement already capture baffle step?

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  • jhollander
    replied
    The original files did not have a baffle step blended with the nearfield. Attached are the latest files

    Attached Files

    Leave a comment:


  • rpb
    replied
    Here's a steep 2k filter that hammers the 5k spike.

    Click image for larger version

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