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  • DIY "White Van" Speakers.

    Before you throw fruit at me and boo, let me explain.

    For his 9th birthday, my kid wants to help me build him some speakers for his bedroom. I want to build something for around $100, including drivers, crossover, wood and misc hardware.

    I know a simple two way with a 6.5" woofer would serve him well, but he's not going to be happy unless he has a three-way with big woofers in a big box.

    Also, this needs to be something we can easily build in a weekend - or a day. Basicly, I've used the sort low-to-high function and I've tried to match efficencies of the drivers, so hopefully we'll be able to make something reasonably balanced on the first try.

    Tweet:
    http://www.parts-express.com/pe/show...number=270-150

    Mid:
    http://www.parts-express.com/pe/show...number=292-432

    Woof:
    http://www.parts-express.com/pe/show...number=292-410

    Crossover:
    http://www.parts-express.com/pe/show...number=260-210

    Anyone see anything that can go horribly wrong here - other than lopping off fingers on the table saw?

  • #2
    Re: DIY "White Van" Speakers.

    For a very small price increase, I would also consider this tweeter. It has a very smooth response and sounds quite excellent.

    http://www.parts-express.com/pe/show...umber=264-1028
    Modding the Lepai T-Amp

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    • #3
      Re: DIY "White Van" Speakers.

      That's quite an order for $100... I really can't think of anything that matches your design plans for that budget.

      Comment


      • #4
        Re: DIY "White Van" Speakers.

        Originally posted by XtremeRevolution View Post
        For a very small price increase, I would also consider this tweeter. It has a very smooth response and sounds quite excellent.

        http://www.parts-express.com/pe/show...umber=264-1028
        You beat me to it!! That is a great tweeter for the money.

        Not sure about that mid....no curves posted and they don't even list Xmax. Sealed back would make the build much easier, but you might have better luck with one of the Jamo 5.5" buy outs and create a small sealed space for the mid & tweeter. it's just 2 more pieces of wood. Plus, you can use a little less sensitivity on the mid to help overcome Baffle Step losses. The kid will like em even more if they have a little thump!
        Co-conspirator in the development of the "CR Gnarly Fidelity Reduction Unit" - Registered Trademark, Patent Pending.

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        • #5
          Re: DIY "White Van" Speakers.

          I think you have chosen some decent drivers for the cost. Most here would whine about the xover, but to be honest, that xover is probably better than those white van speakers anyway. Not to mention this is for a 9yo, and not an audiophile. Looks like a fun build!

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          • #6
            Re: DIY "White Van" Speakers.

            I'd look at these two projects by Johnnyrichards:

            http://techtalk.parts-express.com/sh...d.php?t=226848

            http://techtalk.parts-express.com/sh...d.php?t=224467

            measured, documented, and reasonable (except for the price increase on the dayton tweet)

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            • #7
              Re: DIY "White Van" Speakers.

              I think your kid is going to love these no matter what you do (as long as they've got big woofers like you said), but what bugs me about what you suggest is that the crossovers are expensive and they're not going to sound good. I wouldn't have high hopes for the sound quality on those midranges either.

              What if you scrapped the midrange altogether, doubled up on the woofers, upgraded to the suggested Vifa tweeters, and just did a TMM. Then you could just do a simple 2-way design that would have a decent tweeter and tons of output with a semi-customized crossover depending on what resources you have. The woofers are much cheaper when you order 4 and the only downside is going to be off axis response, which I don't think is a big deal given the application.

              Dan
              _____________________________
              Tall Boys
              NRNP Computer Sub
              The Boxers
              The Hurricanes
              The Baronettes
              Conneccentric
              UX3

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              • #8
                Re: DIY "White Van" Speakers.

                Hmm - I like the TMM idea. There's a lot of inexpensive 8" options.

                I want to be carefull about "scope creep" though. If I get into 4-weeks of cabinet construction and crazy crossover modeling, he'll loose interest and this won't be a father/son thing anymore.

                More than likely, this setup will utilize his i-pod and a little T-amp. The big speakers are really for visual impact and so he can show off his system to his 9-year old freinds. I almost think a two-way with a big passive radiator would work well. Honestly, he won't know the passive radiator isn't really a powered speaker. Unfortunately, the passive radiators are more expensive than some of the woofers I'm considering.

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                • #9
                  Re: DIY "White Van" Speakers.

                  I didn't realize that Johnny had used those mids. His design based on the 12" GRS may cost a little bit more that what you proposed, but not by that much. The big inductor in his is only $10.50. I would bet it will sound much better than any stock crossover, especially due to a few dB of BSC being factored in Johnny's design. Also remember that the stock crossover won't have any padding on the mids or tweeters, so you'll have to juggle those values as you voice.
                  Co-conspirator in the development of the "CR Gnarly Fidelity Reduction Unit" - Registered Trademark, Patent Pending.

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                  • #10
                    Re: DIY "White Van" Speakers.

                    to save some extra money on it, you could probably use electrolytic caps instead of poly's, and i don't think it'd be too hard to get that vifa to hit a 4k crossover point.... that would save you about $20 over the dayton ND20FA's. it wouldn't be a direct swap, though, and probably would need more padding too.

                    also, you can build it, finish it, and go back inside and tweak the crossover later and explain that as speaker break-in ...
                    TM (RS125/TB25-302), TM RS150S / Vifa BC25SC06, RS150-4 / Vifa ML-TL, 3CR-AL Ultra Budget: Electric Blue TM, TMM, MTM, Dragonflies , Mounties: Mini HT Satellite,sub for minions

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                    • #11
                      Re: DIY "White Van" Speakers.

                      I have one of the Vifa BC15SC buyouts at home,maybe I can work up a new crossover for LSS using that tweeter instead of the Dayton.

                      Your kid would love the big monkey coffins
                      Don't listen to me - I have not sold any $150,000 speakers.

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                      • #12
                        Re: DIY "White Van" Speakers.

                        Yeah me and my dad are going to build the LSS's when I get home... gotta order the parts, come to think of it.

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                        • #13
                          Re: DIY "White Van" Speakers.

                          If you could copy a crossover for that Vifa tweet that was cheap and had a smooth rolloff, you could order a few cheap resistors to get the padding right and guess on a lowpass for the woofers (TMM). If you got a coil and a couple caps for the lowpass, you could have several combos to try:

                          1) woofers run full range - no low pass
                          2) coil in series with woofer - 6dB electrical
                          3) coil in series + 1 cap shunt
                          4) coil in series + other cap shunt
                          5) coil in series + caps in series shunt
                          6) coil in series + caps in parallel shunt

                          This is quite a few options and I bet one of them would sound better than that stock 3-way.

                          Dan
                          _____________________________
                          Tall Boys
                          NRNP Computer Sub
                          The Boxers
                          The Hurricanes
                          The Baronettes
                          Conneccentric
                          UX3

                          Comment


                          • #14
                            Re: DIY "White Van" Speakers.

                            Originally posted by tom_s View Post
                            You beat me to it!! That is a great tweeter for the money.

                            Not sure about that mid....no curves posted and they don't even list Xmax. Sealed back would make the build much easier, but you might have better luck with one of the Jamo 5.5" buy outs and create a small sealed space for the mid & tweeter. it's just 2 more pieces of wood. Plus, you can use a little less sensitivity on the mid to help overcome Baffle Step losses. The kid will like em even more if they have a little thump!
                            http://techtalk.parts-express.com/sh...d.php?t=223658
                            some info on the mid.
                            " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

                            Quote Originally Posted by hongrn. Oct 2014
                            Do you realize that being an American is like winning the biggest jackpot ever??

                            http://www.midwestaudioclub.com/spot...owell-simpson/
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