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  • Soundslike
    started a topic Duellati Build

    Duellati Build

    In a previous post, I mentioned seeing and hearing a very nice design called the "Duellati" while attending the Arizona DIY event in Tucson, last March. "Duellati," by the way is a plural form of a word coined by the designer of this compact MTM, Mark Miller. I'll let him expound on how he arrived at the name if he chooses to. Mark (better known on the Parts Express Tech Talk Forum as "Mark65") lives in the same general area where I live (the greater Phoenix metropolitan area), and when I contacted him, he was receptive to the idea of building another set of his design, with an alternative tweeter to replace the unobtanium Seas tweeter used in the original design. Hopefully, he'll chime in here and fill in the details about his design.

    I was impressed with the design, and several others I saw at the event, but the Duellati were appealing for several reasons. They are a very nice loudspeaker, with a strong potential for passing the WAF obstacle. They produce high quality sound, from a small compact design, they are attractive and unique looking with their aluminum coned DA115 drivers, they will fit-in a room without dominating the overall decor or frustrating the interior designer (whoever that might be) and they can be built at a very attractive price.

    The Duellati design uses the Dayton Audio DA115-8 4" Aluminum Cone Woofer,
    part # 295-328, which can be purchased four-up for the bargain price of $13.24 each. The tweeter used in this design is the Vifa 25SG 15-04, part number 264-1026, currently available for $14.37 each.





    As is my habit, I produced a drawing of the Duellati, before making any sawdust. Note that I updated the drawing on July 23, 2012 after some confusion about the port size. The updated drawing includes Mark's original crossover design which has been refined by Wolf. I'd suggest that builders contact Mark and Wolf about the revised design. If Mark chooses to post the revised plan, I'll alter the drawing again.



    I sent the drawing to Mark for his approval -- you may notice that three different tweeters are shown. In the end, the Vifa won out for reasons of performance vs. cost. The drawing also shows two different top views, one of which was to help visualize how a 1" roundover would look on the sides of the baffle. Not surprisingly, there wasn't enough room. The drawing also shows b**t joints, for the sake of simplicity, but rabbeted joints were used throughout in this build. B**t joints are perfectly adequate for this type of construction, but I wanted to utilize rabbets just because they provide automatic indexing of the parts, and the increased glue area does produce a stronger joint -- not that it's needed. The port length is 6-1/2", as shown in the drawing, made from 2" PVC pipe.

    3/4" MDF was used for the enclosures. Panels were cut from the 4 X 8 sheet into more manageable pieces, using the circular saw guide shown in the photo still attached to the MDF sheet.



    The MDF panels were then cut to the necessary dimensions using a table saw.



    A 3/8" X 3/8" rabbet was cut into all four edges of each panel. The table saw was used for the process also, with a standard blade, as opposed to a dado blade. Using a standard blade makes it necessary to make two cuts on each edge -- one with the panel in the vertical position, and one with the panel flat against the table. In the following photo, you'll notice that a jig fitted over the fence was used to keep the panel vertical.



    The panel was then placed flat on the table saw to make the second cut. A panel with rabbeted edges can be seen sitting on the edge of the table saw.



    In the following photo, Mark is seen holding the panels together, dry fitted. His Duellati are shown to his left. The enclosures we're putting together in this build will differ from Mark's originals in that a different tweeter will be used, only the left and right sides of the baffle will be rounded-over, and the finish will be a high gloss black.



    I'll be back with more later... I need to get these ready for the AZ Buckeye mini DIY get together this Sunday..
    Attached Files
    Last edited by Soundslike; 07-23-2012, 02:00 PM. Reason: Inserted a photo I forgot

  • Soundslike
    replied
    Re: Duellati Build

    Originally posted by Wolf View Post
    Jeff just measured and listened with no complaints! ;) That was after I made the adjestments for Mark and used a couple handfuls of stuffing.

    Later,
    Wolf
    Thanks Wolf....

    Leave a comment:


  • Wolf
    replied
    Re: Duellati Build

    Originally posted by Soundslike View Post
    Can't wait to hear them again with the refinements made by Wolf and Jeff.
    Jeff just measured and listened with no complaints! ;) That was after I made the adjestments for Mark and used a couple handfuls of stuffing.

    Later,
    Wolf

    Leave a comment:


  • Soundslike
    replied
    Re: Duellati Build

    Thanks for the tip about the error shown on my drawing. I'll get that corrected ASAP - wouldn't want anyone to build a set with the wrong port.

    Note: After the comment from a builder regarding confusion about the port size, I reviewed my drawing this morning. I can see where the confusion came from -- the dimension shown over the end of the port tube was for the internal dimension (height) of the box. The port ID wasn't specified in the drawing, so I moved things around and labeled the port. Hopefully everything is clear now.

    Thanks everyone for the compliments, and thanks to Mark for the design. Can't wait to hear them again with the refinements made by Wolf and Jeff.
    Last edited by Soundslike; 07-23-2012, 02:06 PM.

    Leave a comment:


  • gowa
    replied
    Re: Duellati Build

    Drivers under 100 bucks..real nice looking.

    Leave a comment:


  • AR3A
    replied
    Re: Duellati Build

    Originally posted by Soundslike View Post
    Here's a photo of one of the finished Duellati. This really is a great little design -- I'm very impressed with these. I think they're attractive and their diminutive size makes them especially suitable for Home Theater setups where minimal impact on the overall decor is desired. Mark's design really does meet both goals -- unobtrusiveness, and excellent sound quality.



    I'll post a few more photos later..
    I must say awesome job !

    Finish looks A+

    I am so building these.

    Leave a comment:


  • Mark65
    replied
    Re: Duellati Build

    Not yet, but I will, and I'll post them.


    Mark

    Leave a comment:


  • Wolf
    replied
    Re: Duellati Build

    Did ya take shots of the internals after they got Wolfified? ;)

    Heh,
    Wolf

    Leave a comment:


  • Mark65
    replied
    Re: Duellati Build

    I didn't notice that in his drawing, but 2" is correct, and is what he put in them. They just got back from Dayton, and are in my living room right now. Just to make sure, I measured them.


    Mark

    Leave a comment:


  • chazhob
    replied
    Re: Duellati Build

    Hi Soundlike -
    Your box drawing shows 1.5 inch ID vent. Mark's writeup calls for 2 inch ID. Which is correct ?
    Thanks, Chuck H

    Leave a comment:


  • Soundslike
    replied
    Re: Duellati Build

    Nice to hear from you -- thanks for the compliments. WAF is, without a doubt, probably the single most important design factor in the real world. It doesn't do much good to build a world-beater, if you're going to get more noise from your wife than you'll ever hear from the speaker. It would appear that you've been smitten by the speaker-building hobby -- that's a good thing...

    The Duellati are a nice design, easier to fit into your living space than most -- mine have made their way around the country a bit and have benefited from refinements suggested by a couple of respected designers, Wolf and Jeff Bagby. I haven't heard them since -- they're hanging out back east, hoping to get some exposure, I'd guess. Mark65 is the original designer.

    Leave a comment:


  • drharper
    replied
    Re: Duellati Build

    Very impressive and gave me a lot of ideas for some projects that I want to do. I am a novice speaker builder and this type of post is so helpful!

    I have a good shop and decent woodworking skills, for me I need to learn the speaker dynamics, crossover, and sound analysis.

    I am trying my best not to rush into these projects either. I just built a set of BR-1s and really enjoyed it. They aren't done yet either and I already am shopping PE for another project.

    Love the mention of the WAF - that is a big one for me.

    Leave a comment:


  • bkeane1259
    replied
    Re: Duellati Build

    Hot, dry weather helps paint cure quicker!! :p

    7.3" of rain in May in Chicago sort of bites.....but I guess we'll have some nice greenery :rolleyes: ...just not as many speakers.

    Leave a comment:


  • Paul Carmody
    replied
    Re: Duellati Build

    Wow, I blink, and the thing is done. Nice job!

    Leave a comment:


  • Randall Kepley
    replied
    Re: Duellati Build

    Ron, those look Fantastic my friend! I havent been around much in the last week or two Ive been pumping things out in the shop getting ready for vacation next week and low and behold look what we have here! Great job as usual on your part and Im sure they sound as good as you say. On thing I would like to suggest to you is , I just read in one of your post where you were sanding your primer you said you had I think 4 or 5 power sanders but you still hand sanded because you were worried of taking off two much where you didnt want to. Here is a link to the sander I use when Im finishing a painted product espc when Im doing a "Piano" finish

    http://www.nolansupply.com/bysubcate...lse&specs=True

    It vibrates in a very fine micro circles and is very controlable and when starting w/ a 400grit or higher wet/dry paper its hard to screw up. It also has a air control valve that you can adjust to almost nill untill you get the feel of it. Its a little priceie but worth every penny. Im still trying to find the time to do the thread on the "Piano" finish techique I was telling you about , Ive done the work and took the pix , just trying to find the time to post the thread, but in the thread there are several pix of this sander and what it is capable of . It realy saves the wear and tear on the wrist and elbos. Great job my friend. R.K.

    Leave a comment:

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