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My first 3 way speaker build

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  • fatmarley
    replied
    Re: My first 3 way speaker build

    Stuffing -

    Dacron does next to nothing. Egg crate foam will work if it's open cell stuff and the best place to put it is in the mid/tweet box. Other materials you can try are Acoustastuf and Monacor MDM3 - the best is arguably fiberglass but I'd only use fiberglass in a sealed box for obvious reasons.

    The reason for stuffing is to attenuate midrange reflections to try to stop them coming back through the cone. If you go too mad with stuffing, you can make the midrange sound dull, so it's well worth experimenting.

    As others have said - great choice of drivers and if you get the crossovers and stuffing right they should sound great.

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  • Ray Tremblay
    replied
    Re: My first 3 way speaker build

    Originally posted by mattsk8 View Post

    [ATTACH=CONFIG]59162[/ATTACH]
    Nice. I love a small 3 way with a 10 on the bottom. A Scan mid is always a bonus, too.

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  • arlis_1957@yahoo.com
    replied
    Re: My first 3 way speaker build

    Originally posted by Jay1 View Post
    Measure the woofer at the same distance and drive level on axis as you do for the T/M (something like 24" is plenty of distance). Set the gate like you normally would to filter out all of the low end room related junk and save that curve. Now measure the woofer nearfield and adjust the level so the curve overlaps at the frequency your gate from the previous measurement starts. Save both curves. Use print screen and MS paint to remove the garbage and run the combined curve through SPL Copy. If there's a low frequency noise floor in your measurements like many people have you can also run the results through response modeler to add a filter that removes the junk.

    You will need to do this for your mid as well. That noise floor in the mid/tweet measurements will throw off the phase in your x over sim.
    or this.......http://audio.claub.net/software/FRD_...r/Blender.html

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  • hongrn
    replied
    Re: My first 3 way speaker build

    Looking good Matt! Looking forward to see this project completed soon.

    Hong

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  • Mike220
    replied
    Re: My first 3 way speaker build

    Very interesting build here. I thinkk you should drag it to chicago but thats just me!

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  • isaeagle4031
    replied
    Re: My first 3 way speaker build

    Originally posted by mattsk8 View Post
    In a cabinet with a woofer crossed at roughly 225 hz, where would I hear the egg crate difference? I already have one of the cabinets internally lined with 1" thick acoustic foam. I'll use egg crate foam behind a midwoofer in a TM if I'm getting excessive cabinet noise, but I don't see the benefit here.
    It really won't make any difference in the woofer cabinets, especially when crossed that low. My Intrepids are crossed at 300, 3 cubes slot port, tuned to 25hz. No issues there and plenty of people have heard them.

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  • mattsk8
    replied
    Re: My first 3 way speaker build

    Originally posted by rpb View Post
    I wouldn't expect you to hear a difference after adding dacron or polyfill, but I would expect you to hear a big difference with a few slabs of egg crate foam in the box. I guess that's damping, and not actually considered stuffing.
    In a cabinet with a woofer crossed at roughly 225 hz, where would I hear the egg crate difference? I already have one of the cabinets internally lined with 1" thick acoustic foam. I'll use egg crate foam behind a midwoofer in a TM if I'm getting excessive cabinet noise, but I don't see the benefit here.

    Leave a comment:


  • rpb
    replied
    Re: My first 3 way speaker build

    Originally posted by mattsk8 View Post
    I've only had about maybe an hour of listening time so far and I want to play with it. That's where I'll start, I have dacron and some polyfill and I'll play with that first. I didn't stuff them because I wanted to listen first to the difference lining the cabinet made.

    To be completely honest (and not to start a huge war), I don't think stuffing makes a super huge difference either way. But I'll play with it and find out.
    I wouldn't expect you to hear a difference after adding dacron or polyfill, but I would expect you to hear a big difference with a few slabs of egg crate foam in the box. I guess that's damping, and not actually considered stuffing.

    Leave a comment:


  • mattsk8
    replied
    Re: My first 3 way speaker build

    Originally posted by rpb View Post
    I'd add stuffing to the second box right away. I don't know how you can listen to it at all with it empty.
    I've only had about maybe an hour of listening time so far and I want to play with it. That's where I'll start, I have dacron and some polyfill and I'll play with that first. I didn't stuff them because I wanted to listen first to the difference lining the cabinet made.

    To be completely honest (and not to start a huge war), I don't think stuffing makes a super huge difference either way. But I'll play with it and find out.

    Leave a comment:


  • rpb
    replied
    Re: My first 3 way speaker build

    Originally posted by mattsk8 View Post
    I got the cabinets roughed in about a month ago, and I now have a crossover roughed in!!! Now I need to voice these and play with the bass cabinets a bit. I kind of feel a bit... out of my league :o. IMO voicing these is like having to drive the space shuttle down the expressway during rush hour, because there is so much going on (they're revealing to say the least). All the drivers are incredible, the SS 18w mid is nothing short of spectacular, and the SS HDS tweeter is a perfect fit for it; the mids and highs aren't lacking anywhere.

    This all measures pretty flat right now, but the bass is a tad wonky, I need to play with stuffing. There's a bit of a dip in the 100Hz region, but that could've been the room too. I have the woofer crossed at about 250-225, and mid is at about 2.3k. I have one of the cabinets lined with 1" thick, spongy adhesive backed foam, the other is empty. I'll play with swapping woofer position (on the floor verses how it is in the pic), then I'll play with different stuffing. FWIW, I called Madisound and they said their cabinet dims were good to go, so I used their specs for the SB29 woofer and built the woofer cabinet 2.0 cf, with a 3" x 12" precision port, which should have a F3 of around 27 Hz. Once I get the bass where I like it, I'll move on with my attempt to voice those mids and highs :eek:.

    No real questions (yet), just thought I'd update progress. So far what I think I love is how revealing these are, but I've only had about an hour of play time with them.

    [ATTACH=CONFIG]59161[/ATTACH] [ATTACH=CONFIG]59162[/ATTACH]
    I'd add stuffing to the second box right away. I don't know how you can listen to it at all with it empty.

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  • Navy Guy
    replied
    Re: My first 3 way speaker build

    This should make for a great combination. I look forward to seeing more info on these.

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  • mattsk8
    replied
    Re: My first 3 way speaker build

    Originally posted by ani_101 View Post
    These coming to chicago?
    I doubt it. I do think I'll have them ready for Meniscus' show in mid September though .

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  • ani_101
    replied
    Re: My first 3 way speaker build

    These coming to chicago?

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  • mattsk8
    replied
    Re: My first 3 way speaker build

    Originally posted by Sydney View Post
    What's the phase angle @ that point?
    I can hopefully answer that one later, I don't have the measurements here. Once I do, I'll let you know.

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  • Sydney
    replied
    Re: My first 3 way speaker build

    Originally posted by mattsk8 View Post
    ...The impedance dips into the 3 ohm range.
    What's the phase angle @ that point?

    Leave a comment:

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