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NE225W+PM180+ViaWave Design & Build Thread

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  • r-carpenter
    replied
    Just want to add the usual 2c. While tuning the speaker, ideally, drivers should blend in seamlessly. You shouldn't expect to hear the tweeter and the rest of the system. Sort of like, if you hearing the subwoofer in the room, it's turned up too high.

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  • bill poster
    replied
    the viawaves in my build sounded a bit muted too, altho plenty of detail. They can almost disappear too much into the mix. I'm guessing a slightly raised response isn't a bad thing

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  • jml
    replied
    I'll grab a screenshot with phase next time I take some measurements. The treble doesn't sound too hot (to me). I tried one iteration with the tweeter padded down a little further, and I felt like it sounded too muted or muffled.

    Best regards,

    Joe

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  • Face
    replied
    Screen shot with phase included? Does the treble sound hot to you?

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  • jml
    replied
    Here is the on-axis in room response along with the current crossover.

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  • jml
    replied
    Originally posted by ani_101 View Post
    I might have missed it, but what steel did you use and how did you cut it? Also what did you use for the grill sides to raise them off the baffle? And what paint?
    The grill mesh is #20 stainless steel mesh. I cut it with a sheet metal snips, which worked well. The grills stand off the baffle on PE grill magnets. The mid-woofers have 1 magnet that align with each of the mounting screws, and the woofers have 2 each stacked up at each of the mounting screws in order to allow enough clearance at full excursion.

    The paint is Krylov Supermaxx Matte Black. I used this on the grills and the spike feet, and it works great. It bonds well to the metal, and easily gives a very smoother and even finish.

    The magnets are glued onto the grill frames. I've tested them at pretty high volume levels without any vibration. I also took some FR measurements with the mid woofer grill on and off, and there was no significant difference - there might have been fraction of a dB here or there, but nothing that is discernible by the human ear.

    The grills ended up costing about $200 between cutting the grill frames, stainless mesh, magnets, and paint, but it's a construction that I would definitely do again, and highly recommend to others. If you have the frames cut with a CNC laser, your imagination is the limit with what shapes you could create. The guys at VMetals http://vmetalsfab.com were great to work with. I sent in a request for quote, and had parts on my doorstep within 4 days.

    Cheers!

    Joe

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  • ani_101
    replied
    I might have missed it, but what steel did you use and how did you cut it? Also what did you use for the grill sides to raise them off the baffle? And what paint?

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  • Chris Roemer
    replied
    Just stand that smallest coil up, and aim it like it's going to roll toward the small air-core next to it. That's all I got.

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  • jml
    replied
    Good Evening!

    After long last this project is finally making music! I've gone through a few different iteration of the the crossover, and I think I've got it pretty close to where I want it to be at this point. Attached is a picture of the "test build" I did to ensure that all the parts would fit in the base of the speaker. I tried to take into consider the potential interaction of the inductors, but with as many as I have, it's probably not 100% perfect.

    I was pleased to determine that the nastiness at 1,000hz above appears to have been a reflection effect when I took the original PM180 measurement. I should have gated the measurement tighter.

    I'll post the final schematic and measurements once everything is complete.

    Cheers!

    Joe

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  • jml
    replied
    Ok, here is the most recent crossover attempt based on the new measurements. I think the ViaWave will be much more comfortable with this crossover, and it looks like I"m getting good summing between the mid and tweeter after reversing the tweeter polarity. The impedance is still dipping below 4 at a couple points, but not too bad. I haven't been able to solve the nastiness at 1khz though.

    What do you guys think?

    Joe

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  • marvin
    replied
    They look great and fit very well with your furnishings!

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  • jml
    replied
    Thanks! They're a little over 100lbs each.

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  • filmslayer
    replied
    they look fantastic , but i'm wondering about the lack of round-overs ?

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  • 6thplanet
    replied
    Cool, they have real weighty look goin on. (I'm sure they are pretty heavy 😎 )

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  • jml
    replied
    The grills are finally complete! There were a few false-starts, but I think it came together in the end.

    Cheers!

    Joe

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