Pictures from Dayton 2010

[edlafontaine]

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.

[edlafontaine]

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...;)

[penngray]

Re: Pictures from Dayton 2010

..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.

[xavier]

Re: Pictures from Dayton 2010

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

[edlafontaine]

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...

[bwaslo]

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

[envisionelec]

Re: Pictures from Dayton 2010

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-way/163986-2-way-omni-experiment.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?

[robwest]

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!

[Wolf]

Re: Pictures from Dayton 2010

Griffins can dance....:D



Later,
Wolf

[Froste]

Re: Pictures from Dayton 2010

For more pictures go here

[Zilch]

Re: Pictures from Dayton 2010

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.... ;) ]

[Dennis H]

Re: Pictures from Dayton 2010

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.

[Jim Griffin]

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

[Paul K.]

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

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.

[penngray]

Re: Pictures from Dayton 2010

Thanks,

The thread for treating the waveguide is here. Its just discussion, zero conclusions yet.

http://www.avsforum.com/avs-vb/showthread.php?t=1248218&highlight=plumbers+putty

Titch used long strand reinforced fiberglass filler and I used plumbers putty after trying modelling clay which cracked and stopped holding after 3 weeks.

I have been slow to get all measurements done but the simple coin test and then listening test (I have Active XOs already) showed great subjective improvements.