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  • DanP
    replied
    Re: New Wave buyouts

    Originally posted by jhollander View Post
    Nice work Dan.
    Thanks John.

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  • DanP
    replied
    Re: New Wave buyouts

    Originally posted by upsman View Post
    DanP. Would these changes apply to the 6 inch version.......I believe the tweeters are the same. Thoughts?

    BobC
    I would think not. The nature of a series crossover is that every component affects everything else, so changing the woofer (coil) will probably change both the woofer and tweeter transfer functions.

    Dan

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  • upsman
    replied
    Re: New Wave buyouts

    DanP. Would these changes apply to the 6 inch version.......I believe the tweeters are the same. Thoughts?

    BobC

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  • jhollander
    replied
    Re: New Wave buyouts

    Nice work Dan.

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  • DanP
    replied
    Re: New Wave buyouts

    Next snip the lead nearest the cup on the 4uf cap and cut the red W+ wire such that what is still connected to the PCB can reach the 4.5mH inductor lead. The other end of the inductor should be connected to the 4uf cap and the wire that continues to the positive woofer terminal. That inserts the inductor into the circuit. Then snip the red T+ wire to insert the 1uf cap and 10 ohm resistor in series. Depending on the components used, some creativity will be needed to securely mount the inductor in such a way to minimize crosstalk with the other inductor, but the cap/resistor circuit can be put right next to the tweeter if necessary.

    And that's it. Re-attach the woofer and tweeter the same way they were connected. I haven't had time to listen yet, or measure distortion, but it should be much improved. BTW, this mod is optimized for the BK52s to be up on stands away from walls.

    Dan
    Attached Files

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  • DanP
    replied
    Re: New Wave buyouts

    When performing this mod, make sure you mark the tweeter terminal that the red wire is attached to. Mine did not have an identifying mark so I could only tell the polarity through measurement. Below are pics of swapping out the 10uf cap for the 3.3uf cap. Try to cut the leads so you can attach the new cap easily and still use the old one.
    Attached Files

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  • DanP
    replied
    Re: New Wave buyouts

    It was a nice surprise that the buyout inductors popped up while I was messing with this mod. The whole upgrade can now be had for $17/pair as seen in the BOM below. The mod consists of swapping out 1 cap, adding 1 inductor, and adding in a cap/resistor circuit. The results are pretty good for this cost with flat FR and good phase tracking near the xo frequency, which moved up substantially to 3kHz. As John mentioned, there is a pesky hump around 1kHz, but I think it wont be too audible as shown. The components in the pic below are ones that I had on hand - the ones in the BOM will look different.
    Attached Files

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  • DanP
    replied
    Re: New Wave buyouts

    Ok, so I got a little time to work on these this weekend. Attached are some pics of the physical mods, which John already showed. I just opened up the internal divider with a 3" hole saw, then filled the rear cavity with polyfil and the front cavity with some fiberglass. I made sure to leave a clear path from the back of the woofer to the port.

    XO modification to follow...

    Dan
    Attached Files

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  • jhollander
    replied
    Re: New Wave buyouts

    IMO the 1K lump is to expensive to get rid of. I had a simple series x-o but it meant taking the tweeter to ~1,500 with bad phase tracking.

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  • DanP
    replied
    Re: New Wave buyouts

    Originally posted by iglow01gt View Post
    Congratulations Dan!
    Thanks for everything that you have done so far.
    Mine are the 5.25"ers, and I have been listening to them, but at normal listening levels.
    They seem fine, until you turn up the volume.
    I see that the tweeter comes reverse polarity, so did you switch yours back to positive?
    I am wondering if that center divider actually creates a dual chamber reflex, and if you are leaving yours intact or not?
    Thanks again for everything, and I will be watching for your results to be posted.
    So far they do seem to be a good value, and I appreciate that you are putting this effort into keeping the project reasonable for beginners who are just getting into experimenting.

    Tim
    Thank you sir!

    It's possible the center divider creates a dual reflex loading like you said, but the port terminates inside the box right at the divider which would make it a very lossy dual reflex at best. I'm definitely going to open up that divider like John did, which will have the added benefit of allowing more space for damping material.

    In terms of the polarity, I only listened to them as they came. As I said, reversing the polarity if the tweeter actually creates a smoother FR, but since the tweeter level is so high, the giant dip created by the tweeter connection as is probably sounds better subjectively. The modded xo will use the tweeter reversed from how they came, but will also knock down the tweeter level a good deal.

    Dan

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  • iglow01gt
    replied
    Re: New Wave buyouts

    Originally posted by DanP View Post
    I had to take a little break as my wife just delivered our 3rd baby girl 2 days ago. I plan on picking it back up soon and in fact, I'll try to work the components around the new group of buyout inductors to keep with the theme.

    Dan
    Congratulations Dan!
    Thanks for everything that you have done so far.
    Mine are the 5.25"ers, and I have been listening to them, but at normal listening levels.
    They seem fine, until you turn up the volume.
    I see that the tweeter comes reverse polarity, so did you switch yours back to positive?
    I am wondering if that center divider actually creates a dual chamber reflex, and if you are leaving yours intact or not?
    Thanks again for everything, and I will be watching for your results to be posted.
    So far they do seem to be a good value, and I appreciate that you are putting this effort into keeping the project reasonable for beginners who are just getting into experimenting.

    Tim

    Leave a comment:


  • DanP
    replied
    Re: New Wave buyouts

    Thanks John! Are these not giving you the results you were looking for? I haven't been able to listen to the modded xo yet.

    Dan

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  • jhollander
    replied

    Leave a comment:


  • DanP
    replied
    Re: New Wave buyouts

    I had to take a little break as my wife just delivered our 3rd baby girl 2 days ago. I plan on picking it back up soon and in fact, I'll try to work the components around the new group of buyout inductors to keep with the theme.

    Dan

    Leave a comment:


  • iglow01gt
    replied
    Re: New Wave buyouts

    Originally posted by DanP View Post
    The current xo is near 1.5kHz, which is way too low for this poor tweeter. I'm having some decent luck leaving the xo in place and just adding a few components to it to get the xo above 3kHz, which avoids a lot of the tweeter distortion. One of these components (for full BSC), however, is a 4.0mH inductor which might be a little pricy for this project. All in all, it should end up being a decent sounding speaker for an extra $20 per side.
    Hi, this thread has been quiet for a while, and I am wondering if you could please post your new results if you have any?
    I picked up 4 to use as surrounds, and would be interested in the mods to improve them before I mount them up.
    Thanks,
    Tim

    Leave a comment:

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