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My first 3 way speaker build

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  • mattsk8
    replied
    Re: My first 3 way speaker build

    Originally posted by Sydney View Post
    Are you doing impedance sweeps and T/S generation?
    Yes to both. These are going to be hard on my Carver TFM-55 amp, but I think it's up for the challenge. The impedance dips into the 3 ohm range.

    Leave a comment:


  • Sydney
    replied
    Re: My first 3 way speaker build

    Originally posted by mattsk8 View Post
    ...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. ...
    Are you doing impedance sweeps and T/S generation?

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  • mattsk8
    replied
    Re: My first 3 way speaker build

    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.

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  • JasonP
    replied
    Re: My first 3 way speaker build

    Originally posted by PWR RYD View Post
    Remember when people were smart and phones were dumb? (Heard that from some comedian). :D
    I try and stay away from smart phones, I don't like using things more intelligent than me.

    Leave a comment:


  • PWR RYD
    replied
    Re: My first 3 way speaker build

    Originally posted by killa View Post
    I understand. I just got a smartphone to replace my flip phone about a year ago lol. I still don't know why? Worse sound, shorter battery life, and it isn't as durable!
    Remember when people were smart and phones were dumb? (Heard that from some comedian). :D

    Leave a comment:


  • killa
    replied
    Re: My first 3 way speaker build

    Originally posted by Jay1 View Post
    But then I have to figure out how to use another program and I like my backwords ways :D
    I understand. I just got a smartphone to replace my flip phone about a year ago lol. I still don't know why? Worse sound, shorter battery life, and it isn't as durable!

    Leave a comment:


  • Jay1
    replied
    Re: My first 3 way speaker build

    Originally posted by killa View Post
    Or you can just use the Frequency Response Blender ;) http://audio.claub.net/software/FRD_...r/Blender.html
    But then I have to figure out how to use another program and I like my backwords ways :D

    Leave a comment:


  • killa
    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 you can just use the Frequency Response Blender ;) http://audio.claub.net/software/FRD_...r/Blender.html

    Leave a comment:


  • Mike220
    replied
    Re: My first 3 way speaker build

    Good luck Matt the drivers all go together pretty nicely. Wish i could say more intelligent things but my brain is mush from veneering all day.

    Leave a comment:


  • mattsk8
    replied
    Re: My first 3 way speaker build

    Originally posted by dcibel View Post
    Nice selection of drivers. I'v been enjoying that tweeter for several years now, it is really excellent. Low moving mass, low compression.
    Good to hear! Those were Craigs recommendation. I've never heard them, but Craig has a pretty good idea of what I like and don't like from the different times we've hung out, so I'm excited to hear those.

    I've had my eye on that SB woofer for a while now and wanted to try it, I've heard it's very "musical" and everything about it looks good on paper.

    Leave a comment:


  • dcibel
    replied
    Re: My first 3 way speaker build

    Nice selection of drivers. I'v been enjoying that tweeter for several years now, it is really excellent. Low moving mass, low compression.

    Leave a comment:


  • Jay1
    replied
    Re: My first 3 way speaker build

    Originally posted by Tessera View Post
    Nice!
    I'm curious about how you plan to measure the woofer for x-over design work? Measuring the bottom of 3-ways far field is difficult for me because I must measure indoor and can't get them far enough away from boundaries.
    Originally posted by mattsk8 View Post
    I'm actually going to rely on Meniscus to help me with that because I've never measured a woofer like this for a passive crossover. For now I'm thinking that will largely depend more on the mid driver's measurements, like Chuck said I'm guessing it'll be crossed to the mid somewhere in the 200-300hz region from the measurements I've seen (I'd like to pull as much out of the Scanspeak as I can so I'd like to go fairly low).
    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.

    Leave a comment:


  • mattsk8
    replied
    Re: My first 3 way speaker build

    Originally posted by isaeagle4031 View Post
    Hmm I wonder where he got that idea? I've done that a couple of times. The last was my Nathan+ design. I could run them as a 3way crossed at 300ish (simple cap to mid/tweets) or let the upper section play alone where they ran all the way down to about 55hz ported.
    Did you have any issues related to having the 2 ports (mid cabinet and woofer ports)? I can't think of why you would since they'd be crossed way above anything near the ports frequency, but just thought I'd double check and ask. If no issue, I could build a 0.7cf cabinet port tuned to 45hz for TM cabinet.

    Leave a comment:


  • isaeagle4031
    replied
    Re: My first 3 way speaker build

    Hmm I wonder where he got that idea? I've done that a couple of times. The last was my Nathan+ design. I could run them as a 3way crossed at 300ish (simple cap to mid/tweets) or let the upper section play alone where they ran all the way down to about 55hz ported.

    Leave a comment:


  • mattsk8
    replied
    Re: My first 3 way speaker build

    Originally posted by Tessera View Post
    Nice!
    I'm curious about how you plan to measure the woofer for x-over design work? Measuring the bottom of 3-ways far field is difficult for me because I must measure indoor and can't get them far enough away from boundaries.
    I'm actually going to rely on Meniscus to help me with that because I've never measured a woofer like this for a passive crossover. For now I'm thinking that will largely depend more on the mid driver's measurements, like Chuck said I'm guessing it'll be crossed to the mid somewhere in the 200-300hz region from the measurements I've seen (I'd like to pull as much out of the Scanspeak as I can so I'd like to go fairly low).

    Craig also had another good idea, and that was to put the woofer's crossover as well as the bottom of the midrange's crossover in the woofer's cabinet and have 4 binding posts, 2 in and 2 out. Then design the mid and tweeter as a sealed TM monitor that sat on top of the woofer cabinet, and I would essentially have 2 different designs. I could play the Revelator full range if I wanted to (but still crossed to the HDS tweeter), or set it on the woofers for a passive 3 way (just to have some fun with it). Not sure if I'll do this just yet, I may still just make one cabinet. Either way, my end goal is to have a similar shape to the Sony SS-AR, or maybe Sonus Fabers. I'm building these for my music system.

    Leave a comment:

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