"Into The Abyss", Tweeters in low places

[dcibel]

I am back on the project tomorrow, the lunatic minister at the church next to my shop dumped gasoline all over a playground
and the property to "kill weeds"!!!!! The fumes were so bad, the misses and I took off to a cabin for a few days...

If only you hadn't seen him, he'd have lit the match and got his insurance payout!

Seriously though, that's a terrible way to kill weeds.

[xmax]

One... That's horrible!
Two... I totally conjured up an image of this guy throwing gasoline everywhere yelling "THE POWER OF CHRIST COMPELS YOU!!! THE POWER OF CHRIST COMPELS YOU!!!" for a solid a minute

If it was that demented, I would have just left the shop and everything in it and started over. I had a strongly worded talk with him before I left
and said if it happens again the EPA (if there is still such a thing) would be getting involved and it could get costly. I think he realized he
F'd up because he agreed with me without issue.

[xmax]

So I have the DA32TX00-8s in a test box with the Satori 9.5" woofers and they sound good actively crossed LR4 at gulp 900hz.
This is not a realistic XO frequency for high output, but still it kind of astonishing it is possible at all and the top end air is not bad, pretty crazy.

[xmax]

Some Xsim vs measurements of the RST28/SEOS combo with and without cap . Thanks to Ketheredge87 for letting me not vaporize his RST's
and helping with ZMA/FRD generation...

Keith is right, I broke the internet.

[Pete Schumacher]

So I have the DA32TX00-8s in a test box with the Satori 9.5" woofers and they sound good actively crossed LR4 at gulp 900hz.
This is not a realistic XO frequency for high output, but still it kind of astonishing it is possible at all and the top end air is not bad, pretty crazy.

A modest guide on the DA32TX00-8 will make 900Hz a piece of cake for high output.

[xmax]

I do not doubt that! I am working on a WG for some SB tweets now. Sorry you did not make it to NAMM Pete!

[bill poster]

A modest guide on the DA32TX00-8 will make 900Hz a piece of cake for high output.

hmm so it CD be used as a mid, a la cell C51

[xmax]

hmm so it CD be used as a mid, a la cell C51

That might be pushing it.

[xmax]

Update, I have been listening to the RST28s in the modded SEOS, they sound pretty darn good with just a 6.2uf cap,
If someone is looking for a minimal 1st order (electrical) tweeter/hp, it does not get much better. See above curves.

Also with Pete's assistance I am revisiting his 2 way WG/RS/B&C post with a few different tweeters to tryout including
the new RST (and the old RS), SB, Wavecor, TX28, TX32 etc. Mated with the Peerless STW-350 in the same box
resembling a classic 3 way, that grew up into a monster.

http://techtalk.parts-express.com/forum/tech-talk-forum/59398-home-pro-8-2-way-rs28a-and-b-c-8bg51

[Pete Schumacher]

Specifically this baffle and elliptical guide. 1" deep. Example tweeter responses are below. Green is the RS28A in the elliptical guide. Red is in the round version. Blue is the TBFC/G in the elliptical.

The guide will be opened up slightly to accommodate the larger tweeters.

[civit]

Are these Peerless units pure corundum or corundum on metal? I'm a little confused from some of the comments here.

Very attractive tweeters for the $. Peerless is creating some really interesting products these days.

[xmax]

Specifically this baffle and elliptical guide. 1" deep. Example tweeter responses are below. Green is the RS28A in the elliptical guide. Red is in the round version. Blue is the TBFC/G in the elliptical.

The guide will be opened up slightly to accommodate the larger tweeters.

The opening is now big enough to use the new RST, the 32mm TX and all SB tweeters. (1.73").

[xmax]

This is a slightly messed up 1" deep Elliptical WG designed by Pete. The opening turned out a little large at 1.8"
I will measure these 4 Tweets on this WG this morning and optimize the "final" WG for them to have listening tests.
RST 28 soft dome (with grill)
Wavecore 30mm with (WG removed)
SB TW29R (faceplate removed)
Peerless 32mm TX

[TN Allen]

If it's being enlarged when sanding the guide, you might try adding a piece of Formica to the back of the guide before milling. This provides a hard surface to protect the throat opening while sanding. Corian works even better, especially where the guide needs to be relieved to fit the tweeter mounting surface.

https://www.flickr.com/gp/[email protected]/269d08

https://flic.kr/p/26wQJBJ

[xmax]

If it's being enlarged when sanding the guide, you might try adding a piece of Formica to the back of the guide before milling. This provides a hard surface to protect the throat opening while sanding. Corian works even better, especially where the guide needs to be relieved to fit the tweeter mounting surface.

https://www.flickr.com/gp/[email protected]/269d08

https://flic.kr/p/26wQJBJ

That is a excellent idea, or maybe even a metal piece that can be screwed on during the sanding process
that could be used over and over, maybe a burnt up tweeter faceplate.