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It’s that time audio enthusiasts! Registration for the 2019 Speaker Design Competition is now open! Visit midwestaudiofest.com for details and to list your speaker project. We are excited to see all returning participants, and look forward to meeting some new designers this year, as well! Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans. We hope to see you this summer! Vivian and Jill
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Pictures from Dayton 2010

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  • critofur
    started a topic Pictures from Dayton 2010

    Pictures from Dayton 2010

    Here are most of my pictures from today's event:

    http://www.flickr.com/photos/critofu...7624342048471/


  • edlafontaine
    replied
    Re: Pictures from Dayton 2010

    penngray posted:
    Do you have a build thread so we can have more discussion?
    That needs to happen. atm I'm at the library for internet access. My cable (& internet) aren't working until Thursday's service call.

    Leave a comment:


  • edlafontaine
    replied
    Re: Pictures from Dayton 2010

    They sounded good enough to add them to the "to do" list ;)

    We need to find a source for the tiny speakers used as tweets. Maybe ask Don Keele...maybe wait for PE to source them...naah!...maybe "discover" where they are made...;)

    Leave a comment:


  • penngray
    replied
    Re: Pictures from Dayton 2010

    Originally posted by edlafontaine View Post
    ..er, if you want to...I'm gonna make a mandrel, or several, to hold the sandpaper AND include the 14.6 degree angle. 2 is almost as easy as 1.

    brainstorm with me big guy...
    Do you have a build thread so we can have more discussion?

    I have 8 QSC HPR-152i waveguides sitting around waiting for new tests.

    Leave a comment:


  • xavier
    replied
    Re: Pictures from Dayton 2010

    Any comments on what the CBT 30's sounded like?

    Leave a comment:


  • edlafontaine
    replied
    Re: Pictures from Dayton 2010

    Dennis posted:
    glue sandpaper to a 1/4 section of a 1" dowel and have at it for a few minutes.
    ..er, if you want to...I'm gonna make a mandrel, or several, to hold the sandpaper AND include the 14.6 degree angle. 2 is almost as easy as 1.

    brainstorm with me big guy...

    Leave a comment:


  • bwaslo
    replied
    Re: Pictures from Dayton 2010

    Yeah -- of all things, it was a solder connection to an IC socket in the crossover board I made! Not even the imprt power amp that I was blaming it on. In fact, it looks like it might have worked if I had just kicked it a good one. (At home I probably would have tried that, but not while standing in front of all those people!:rolleyes

    Leave a comment:


  • envisionelec
    replied
    Re: Pictures from Dayton 2010

    Originally posted by bwaslo View Post
    That one was mine. Emphasis on the "one"..... only half the pair played that night, there was an internal amplifier fatality in the other. There was a short thread about it earlier this year on DIY audio:
    http://www.diyaudio.com/forums/multi...xperiment.html

    I may replace the amps with something less fussy and re-enter them next year. If I can find something powerful enough and small enough, with a built-in power supply.

    Thanks,
    Bill
    Bill, I missed speaking with you after the show... Did you determine what failed?

    Leave a comment:


  • robwest
    replied
    Re: Pictures from Dayton 2010

    Thanks for the pic update, Ed. I can't tell which is brighter, that carpet, or, your grin!:D Congrats!

    Leave a comment:


  • Wolf
    replied
    Re: Pictures from Dayton 2010

    Griffins can dance....:D



    Later,
    Wolf

    Leave a comment:


  • Froste
    replied
    Re: Pictures from Dayton 2010

    For more pictures go here

    Leave a comment:


  • Zilch
    replied
    Re: Pictures from Dayton 2010

    Originally posted by panomaniac View Post
    The audience vote actually weighs heavier than the judge's. I think Ed's speakers got good marks from the judges.

    The contest goes by very fast. Many speakers you can get a feel for in a few seconds. But the really good speakers need longer than the time allowed. Sort of a "play-off" or elimination system. But that would be a 2 day affair, at least.
    Olive teaches that the single most significant factor in initial listener impressions is low frequency extension. I don't know how well Ed's eWave Delites do that, but I'll be providing LF augmentation any time I demo the small-cab Deluxe in the future.

    [Once I work that out.... ;) ]

    Leave a comment:


  • Dennis H
    replied
    Re: Pictures from Dayton 2010

    Originally posted by edlafontaine View Post
    The throat will get attention. I'll graphically compare the 14.6 degree exit angle of the DE250 with the entrance angle of the 152i...determine a suitable thickness for shim stock & blend the two with no void/cavity. Even the outer throat of the 152i needs some smoothing...aahhh!, the pitfalls of being analytical...
    Yeah, the throats on mine could use some work. The entrance isn't perfectly round and is bigger than 1" in places. Looks like about a 1/4" wooden shim glued on would let you get a nice smooth blend -- glue sandpaper to a 1/4 section of a 1" dowel and have at it for a few minutes. I think a smooth blend to the driver is more important than the exact curve.

    Leave a comment:


  • Jim Griffin
    replied
    Re: Pictures from Dayton 2010

    ttan98,

    My bipoles at Dayton were the original ones with the two drivers at the same height front and back. The cross sectional area of the MLTL is doubled to account for the two drivers in the same box. I have a later design with CSS EL70 drivers which are in offset front and back MLTLs. When you offset the heights of the front and rear drivers you essentially have to siamese two separate MLTLs and have porting from both front and rear.

    A super tweeter can be used on the rear to add to the reverb field for the upper octave wherein the direct full range drivers start to beam. In reality I would integrate the super tweeter into the mix only after sorting out the placement of the speakers in the listening room. The super tweeter can be one of many tweets but you do want to have low 90's dB sensitivity and 8 ohms impedance for starters. The super tweeter and a capacitor are connected in series and then placed in parallel across the bipole pair. The cap would be a fairly small value (say 1 mf) and adjusted to your taste from there to get the sound you like.

    Jim

    Leave a comment:


  • Paul K.
    replied
    Re: Pictures from Dayton 2010

    Actually Dan did the primary TL design for the Blades, just using me for a sanity check. The Blades are really good but with the music used to judge the Unlimited Class as well as the over $200 Class, none of those speakers were able to show their true abilities.

    Congratulations to the four winners.
    Paul

    Originally posted by davebullet View Post
    Congratulations to Dan (and Paul Kittinger (?) for his Transmission Line design for the RSS265)!

    Dan's got a thread over at HTGuide on the Blades. However I'm not claiming the crossover design posted there was the one he presented at the DIY.

    I only wish New Zealand was closer. It would be great to attend, meet and learn.

    Leave a comment:

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