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Purveyor; a dynamite small 3-way with concussive tendencies....

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  • Purveyor; a dynamite small 3-way with concussive tendencies....

    Now that InDIYana 2022 is post-op, I figured I post the details to this little marvel that impressed quite a few last weekend.
    The name is appropriate, as Purveyor means to "provide what is required or necessary".

    Goals:
    • Use a 0.23ft^3 knock down cab with a 3-way. This meant very careful driver selection, and a W-T/M orientation.
    • Make it easy to assemble for those with fewer tools. All but tweeters are surface mount.
    • Make it more affordable compared to most 3-way designs.
    • Yield great performance for the modest cost. All drivers have a magnetic shorting turn via a cap or ring.
    • Make a simplistic 3-way xover that is easy to assemble and would fit in the box with all of the drivers.
    Drivers:
    • Peerless SLS 5" P830945; This is working in a 6 ltr net volume to produce F3/10 of 52/38. It also has higher sensitivity than ANY other 5.25" that can accomplish this bass extension feat. Being that, it has a lower Zmin above tuning at 150Hz of 2.3 ohms. This means the woofer lowpass coil has to be an air-core, and I was able to yield a Zmin of 2.6 ohms without speaker wires. This means it should be of a roughly stable 3 ohms by the amplifier sight, and a fairly stable 4 ohm load over all. It's a very minute area, and approaching 0 in terms of phase. Aluminum shorting ring, and long Xmax.
    • To accomplish this response in a small box such as this, there is no way you can use a port and tune low enough. It is just not possible. I was able to fit the SB Acoustics SB15SFCR-00 5x8" PR on the back of the cab. This involved using a midrange chamber of specific orientation to allow the PR to fit, albeit offset in one direction horizontally. 2x 0.5" x 1/8" thick washers and a stainless steel Allen-head M6x1 bolt were used to tune the PR to roughly 20Hz.
    • The Dayton Audio PC83-4 was used as the midrange. Being this is a 4 ohm driver, the xover landed at 650Hz to meld with the woofer to both keep impedance and xmax in check. Being the woofer is a 5.25", the off-axis response is really not impacted heavily. The tweeter and it landed at 5kHz, and the 83 has good enough off-axis response to make this just fine and keep the vocal range centered in the mid driver. The 83 also has a very benign breakup, likely due to its coated woven fiber cone, and it sounds fantastic. A decent xmax and copper cap keep it clean. 1 ltr sealed is all it needed, and this is a benefit here to give the woofer all the volume I could. (I used this midbass in the OSFA blue tooth speaker, and really liked its qualities. I also paired it with the following tweeter as a 2-way. I liked the results.)
    • The Dayton DSN25F-4 Designer Series 1" was chosen to finish off the top 2 octaves, 5k+. Paired with the PC83-4, the acoustic offset seems to be really similar, the CTC is small, and the frame is tiny. Sensitivity is 95dB, so it is heavily padded -13dB, and is loafing with a very easy living. On axis, there is a small rise at 12kHz of about 3dB, but most won't notice it. Just above the tweeter axis about 15* or +4", the rise disappears and the response is really smooth and flat. A copper cap keeps it clean. FF damps the Fs. Possible bonus? These tweeters have been known to be slightly leaky. If yes- then the midrange is in a slightly aperiodic box. If not- it does not impact the performance. Of note; I had a bad unit and PE replaced it. They are on back-order until July currently.
    Place all into blender and pulse 3 times....

    Xover points were 650/5k, not as pictured in the last sim-snap. I did not measure impedance and save it yet, so this should be close.
    Xover board is 6" x 6.25". I ended up upgrading to the Cebo caps on the tweeters after the photo was taken. Much better, IMO.
    Current prices:
    P830945 = 36.98
    PC83-4 = 12.98
    DSN25F-4 = 18.98
    SB15SFCR-00 = 35.70
    Denovo 0.23ft^3 knock-down box = 26.98

    Xovers as built: ~$115.20 each. I used the $4.00 75uF caps from a surplus store in California, and est a $1/resistor. The rest of the amounts are from a distributor's website.

    Total/cab comes to $247.14 including the cabinet, or $494.98; not bad for a compact 3-way! (My cost was $300 from discounts, salvaged upwound coils, used and free drivers, FWIW.) Most of the time, by the time you have xovers factored in with drivers on a 3-way, you're already in the $500+ category without even thinking about cabinets.

    Thanks for looking!
    Wolf
    Attached Files
    "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
    "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
    "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
    "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

    *InDIYana event website*

    Photobucket pages:
    https://app.photobucket.com/u/wolf_teeth_speaker

    My blog/writeups/thoughts here at PE:
    http://techtalk.parts-express.com/blog.php?u=4102

  • #2
    And the rest of images...

    Attached Files
    "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
    "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
    "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
    "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

    *InDIYana event website*

    Photobucket pages:
    https://app.photobucket.com/u/wolf_teeth_speaker

    My blog/writeups/thoughts here at PE:
    http://techtalk.parts-express.com/blog.php?u=4102

    Comment


    • #3
      Great job on these, they sounded really nice at InDIYana. They have an impressively full sound for a small speaker and yet sound pretty neutral. Nice write up also.

      Comment


      • #4
        Ben, the Purveyors really sounded quite good and I was amazed at how satisfying bass-wise most of the small speakers sounded, which just goes to infer that what we tend to hear as "bass" falls in the 50-100 Hz range I think.
        Paul

        Comment


        • #5
          Very cool, Ben. I've always wondered about that Peerless woofer. Or is it a sub? What's your take on it?
          Isn't it about time we started answering rhetorical questions?

          Paul Carmody's DIY Audio Projects
          Twitter: @undefinition1

          Comment


          • #6
            I would call it a woofer. It can play low and loud in small boxes, but it also has a usable range above sub territory. It seems to meld well with the midrange without getting heavy or chesty sounding, so that's a win!

            I've heard the 8" and 10" of the SLS line also, and none have left me wanting more. They're stout little boogers! Even the SDS 830855 and SLS 85S25CP-04 can do some impressive bass things for a 4.5"/3.5", and they have no right to be able to do that!
            "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
            "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
            "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
            "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

            *InDIYana event website*

            Photobucket pages:
            https://app.photobucket.com/u/wolf_teeth_speaker

            My blog/writeups/thoughts here at PE:
            http://techtalk.parts-express.com/blog.php?u=4102

            Comment


            • #7
              This should be a kit. With little desktop size stands to make them look like Bose 901s.

              Comment


              • #8
                Making them a kit has been discussed, but not certain if the other shoe will drop or not. You are not the first to suggest it either. The goals included ease of assembly, and a low-costing 3-way that most anyone could put together. It is meant to be built simply and relatively inexpensively. Given the layout of parts and connections, my wife even said she'd be likely able to construct these xovers. They are flat, all point to point wiring, and a given 'xover by number', would be easy to do. That was also a goal. Purveyor name goes deeper than the sound aspect as it provides all that is required in terms of parts and cabinets as well.

                Wolf

                PS- Don't know about your Bose-likeness query. Just can't 'see' that in my head. However; desktop, monitors, free-standing, bookshelf applications all apply here.
                "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                *InDIYana event website*

                Photobucket pages:
                https://app.photobucket.com/u/wolf_teeth_speaker

                My blog/writeups/thoughts here at PE:
                http://techtalk.parts-express.com/blog.php?u=4102

                Comment


                • #9
                  Click image for larger version  Name:	bose.jpg Views:	0 Size:	205.8 KB ID:	1486175

                  I'll make my own then.

                  Comment


                  • Wolf
                    Wolf commented
                    Editing a comment
                    Okay, I see it now......

                • #10
                  What did anyone at InDIYana think of the bass from my little Peerless 830656 2 way project? They certainly surprised me but I'm most likely biased.
                  Craig

                  I drive way too fast to worry about cholesterol.

                  Comment


                  • jhollander
                    jhollander commented
                    Editing a comment
                    Not to take away for Ben's project but I liked those more than I wanted to. I wish we had more time to compare. We're doing dinner (with you) next time, so we can get some evening listening in.

                • #11
                  They were very nice, Craig! Great drivers..
                  Wolf
                  "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                  "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                  "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                  "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                  *InDIYana event website*

                  Photobucket pages:
                  https://app.photobucket.com/u/wolf_teeth_speaker

                  My blog/writeups/thoughts here at PE:
                  http://techtalk.parts-express.com/blog.php?u=4102

                  Comment


                  • #12
                    Originally posted by PWR RYD View Post
                    What did anyone at InDIYana think of the bass from my little Peerless 830656 2 way project? They certainly surprised me but I'm most likely biased.
                    We're all likely biased about our designs but the bass from your speakers sounded good to me and I'd like to know more about the innards and how you created the ML-TL by incorporating the column's volume with the original enclosure.
                    Paul

                    Comment


                    • #13
                      Nice build.
                      Who says small speakers need to be simple 2-way's.
                      3-way’s are so much cooler.

                      Cheers!

                      Comment


                      • #14
                        Thanks, Greg!
                        Wolf
                        "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                        "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                        "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                        "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                        *InDIYana event website*

                        Photobucket pages:
                        https://app.photobucket.com/u/wolf_teeth_speaker

                        My blog/writeups/thoughts here at PE:
                        http://techtalk.parts-express.com/blog.php?u=4102

                        Comment


                        • #15
                          They look cool and well detailed write up!!

                          Great Job Wolf!

                          Comment

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