InDIYana 2023 theme initialization....

[Wolf]

H26 applies, no question.

I don't want to either choke or flood the motor. You have to have a design flow or stifle creativity. Necessity breeds invention.

[Wolf]

No, as in bookshelf style. Not many of us use poles like PA.
Wolf

[DrewsBrews]

"stand mounts preferred but not required"

As in tophats for tripods?

[deschu]

The H26TG meets the contest requirements as is....are you trying to tell Wolf to make it more challenging?

[KEtheredge87]

Hah. My first TTTW design

[jhollander]

Divide and conquer, 3-4 tweeters should do it.

[rpb]

I've crossed the RS270p at 2.5k to a Peerless H26 tweeter. Crossing lower with a std dome should be easy,

[deschu]

Man... I need to seriously consider how I want to approach this. I have a pair of Satori WO24P-4s that need a use, so I could go high end tweeter. I also don't know what I can get away with by really pushing a tweeter too dang low for the fun of it, so I wouldn't want to super abuse a bunch of higher cost parts too... How should I consider a tweeter for this? Just distortion plots, lower Fs is best, something else?

My approach, flawed as it likely is, has been to look for faceplate-compliant tweeters with larger diameters that have low Fs and large Xmax, and then also trying to find reviews, distortion, and csd data when available on the 'net before ordering some. I believe that Xmax (linear) and (physical limit) is likely to be the predominant thresholds of stuff starting to sound bad and approaching tweeter damage, respectively, as the crossover frequency is dropped and the SPL is increased.

A coworker of mine, who has had a long history in hifi, has been a recent fan of crossing over lower than recommended, but he compensates heavily in these designs by not driving them loud, and he generally tries to stay at least a bit above Fs. My interpretation of the competition, however, is that the ability to provide a non-quiet SPL will be judged favorably.

My current mix of trial tweeter are: Eton 28SD1, Kartesian TWT30, BlieSMa T34A-4, and the CSS LD22F (which I believe is a wavecore + faceplate)...there's some serious money in some of those tweeters if bought new, but eBay came to the rescue. Woofer-side: Visaton GF200, Peerless 830869, Dayton RS270P4A, a variant of the Eminence B102, and the Silver Flute w20rc38-04. My intent is to measure the tweeters for distortion and then Xmaxes (via ARTA with Baumer laser sensor).

I'm presently interpreting the faceplate rule as the tweeter's nominal/original manufacturer faceplate need to meet the dimensions (regardless if modified for the entry), but that a waveguide needs to only meet the faceplate requirement in it's final form. That is, that I can duplicate or modify the optional Kartesian TWT30 waveguide (TWT30_Horn) (which is non-compliant due to it's mounting pattern but not the guide surfaces) so long as the final entry meets the dimensional requirement....but I think this is probably at the edge of the rules.

[KEtheredge87]

Man... I need to seriously consider how I want to approach this. I have a pair of Satori WO24P-4s that need a use, so I could go high end tweeter. I also don't know what I cna get away with by really pushing a tweeter too dang low for the fun of it, so I wouldn't want to super abuse a bunch of higher cost parts too... How should I consider a tweeter for this? Just distortion plots, lower Fs is best, something else?

[Wolf]

I never said anything about area. 4.125" diameter or smaller, or 4" x 4" square or smaller. This means the trunky-Silkie is too big in both measures.

[jhollander]

So the Dayton DC28F is 4.33 inches in diameter does Not qualify, but the truncated DC28FT would qualify by area?

[jhollander]

Yeah I had planned the tw030wa05. That combo is so good I may do it anyway outside the challenge. I thought about hiding it behind a baffle waveguide but the faceplate has an integrated chamber.

[Wolf]

The 14 derivative is smaller than that, but yes- the 4.5" is too large to use. I had entertained the DA32 myself as I have a pair, but they are too large as well.

Your pain is also mine in this quest...

[DanP]

The Wavecor appears to be a 4.5" flange, which I didn't know until I started checking for this challenge. So I assume this is out?

[Wolf]

I am fine with either 4-in square or 4 1/8 diameter that is fine.
Wolf