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The 60 Minute DSA's

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  • The 60 Minute DSA's

    For you beer connoisseurs out there you might see the irony in the name. These hadn't even been measured for design work until about 10 this morning. This is a little something I threw together in less than an hour (not including the build, add maybe another 2 hours for that). I basically aimed for a flat response, decent phase and a safe impedance and ran with it. I did virtually no listening or tweaking prior to them being finished. These are intended for desktop use and adding a sub will yield a really nice sounding setup that doesn't take up any real estate. I did verify everything was wired properly with regard to crossovers and polarity before I buttoned them up, but I just wanted to see how fast I could knock out a small build.

    DSA90-8, ND20FB-4 drivers and used our 0.04 cube knock downs, sealed. I chamfered the back of the woofer hole, otherwise they are very basic in construction. They are good to around 80 but a high pass at 100-120 is going to give you the most output capability. I am using them with a small sub crossed at 100 and they will reach 100 dB from a near field location (24-30"-ish) without much of a problem. Five of them would make a pretty killer HT setup. My best guess is about 4-5 pounds each.

    Nothing special about the crossover design. I was a bit worried about the 2k crossover point but they don't have any issues at all. The raw tweeter response played to 1k and hit a wall, and with the rising response due to the semi horn loading I doubt there will be thermal issues with this crossover point. They were also padded quite a bit. I did use a Zobel due to the high inductance on these small woofers. The impedance is a solid 8 ohms so these can be driven with any modern amp. Sensitivity is not surprisingly low around 80 dB but they have plenty of output with our KAB250 board.

    Listening impressions? Well I'm still in the process of that but so far they don't do anything wrong. The sound stage is crazy wide which is to be expected. They image very well and sound a lot bigger than they are especially with a sub. They are very well balanced overall. They do sound best when 8-10" off the desk (counter in my case) which puts them closer to ear level. Aiming them up would also work relatively well.
    Click image for larger version

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    Last edited by mattp; 02-01-2017, 10:06 PM.
    Your results may vary.

  • #2
    Nice work, sometimes the quick builds are the most fun. Is that duratex on the cabinets?

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    • #3
      Thanks!

      Yes that is Duratex.
      Your results may vary.

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      • #4
        Very attractive! Nicely done.

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        • #5
          Nice, fast work! Really like the new DSA drivers, great bang for the buck! If the DSA90 was to be rear mounted, would your crossover still work or need adjusted?
          My "No-Name" CC Speaker
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          • #6
            Rear mounting the woofer might add some odd diffraction issues but I don't know for sure, they might be out of the passband used in this design. Honestly front mounting seems much easier to me using these cabinets. Chances are there wouldn't be anything that would stand out too much if you rear mounted..
            Your results may vary.

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            • #7
              Nice! Cool quick project. And with my IPA in hand, I like and appreciate the name!

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              • #8
                Nice project. I am impressed how quickly you put this together. I almost take that much time just getting my tools together and setting up.
                Last edited by thekorvers; 02-02-2017, 04:28 AM.
                Don't worry, if your parachute fails, you have the rest of your life to fix it.

                If we all did the things we are capable of doing, we would literally ASTOUND ourselves - Thomas A. Edison

                Some people collect stamps, Imelda Marcos collected shoes. I collect speakers.:D

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                • #9
                  Cool! I love these tiny two way designs. Looks good!

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                  • #10
                    Looks like a Nanotech entry....
                    Nicely done!

                    The ND20s have fewer issues with xovers when you go third order elec on them, IME/IMO.
                    Later,
                    Wolf
                    "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                    "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
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                    • #11
                      Originally posted by thekorvers View Post
                      Nice project. I am impressed how quickly you put this together. I almost take that much time just getting my tools together and setting up.
                      Originally posted by Jeff F. View Post
                      Cool! I love these tiny two way designs. Looks good!
                      Originally posted by Wolf View Post
                      Looks like a Nanotech entry....
                      Nicely done!

                      The ND20s have fewer issues with xovers when you go third order elec on them, IME/IMO.
                      Later,
                      Wolf
                      Thanks guys!

                      Wolf, that's good to hear. I hadn't played with this model yet and this seemed to be the sweet spot it wanted to be crossed without adding notches, etc. Those small baffles make things tricky.
                      Your results may vary.

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                      • #12
                        Conventional wisdom is that the ND20's should be crossed at or above 3.5 kHz. I rather like challenging conventional wisdom, so I would be interested in how they are holding up to the lower crossover point. Sometimes it works out that by the time the tweeter is complaining, the woofer is also complaining, so there isn't any reason to be specifically concerned about the tweeter...
                        Keep an open mind, but don't let your brain fall out.

                        Sehlin Sound Solutions

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                        • #13
                          Scott,

                          I've driven these quite hard, hard enough to reach woofer Xmax with a 125 Hz high pass filter and nothing has failed. Other than it just being "too loud" in general nothing seemed to be complaining. This was done for experimentation and only for a minute or so with music so longer term volumes like this might be different, but if you are aiming for that kind of output you need a larger speaker anyway. I'm pretty happy with how well these hold up to the rigors of output even though I don't ever play them that hard normally. I don't see any issues with this crossover point - at least in this design.
                          Your results may vary.

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