"Into The Abyss", Tweeters in low places

[DaveFred]

Here is the RST28F-4 in the Visaton waveguide. I have yet to measure it, but will post when I do.

[Wolf]

He's not been on here since April Fools' Day this year.
Wolf

[racingpht]

Vistaton WG and Peerless DA25TX, the faceplate mounting screws are not quite countersunk,
fixing those and adding some holes to mount the guide to the tweet should be all it takes for a
good fit, more soon.

Hi Xmax, Do you have a chance to test DA25TX in Visaton Guide?
Thanks in advance,

[xmax]

With a .125" thick CNC faceplate the transition should be fine.
Perhaps even without it.

[xmax]

Has anybody tried the SB26ADC/CDC in an off-the-shelf waveguide? Augerpro did some great work on customs for them, but I haven't seen anyone posting results in guides like the Visaton or SEOS8, which I'm guessing might need a little mod work to narrow the throat a bit. Their low-end capability looks great even with no waveguide, but some directivity control would be useful.

I am currently investigating using 1.4" "pro sound" WG/horns on 26mm domes.

[xmax]

I need to wash my hands after viewing this forum.

[TN Allen]

Good luck, seems you've got the wg bug.

[xmax]

RST in unmodified SEOS WG, curves to follow, I imagine
they will be great, like the slightly modded SEOS to accept
the RST grill.

[Deef]

I think someone mentioned Toels Gravesen's use of waveguides at some point. This is a link to several tests he did with Scanspeak drivers using his waveguide. http://www.troelsgravesen.dk/ScanSpeak-waveguides.htm

[xmax]

What is the 6x9 waveguide?

An Elliptical Pete S designed for my spec. It's 1.5" deep.

[kclb1540]

Has anybody tried the SB26ADC/CDC in an off-the-shelf waveguide? Augerpro did some great work on customs for them, but I haven't seen anyone posting results in guides like the Visaton or SEOS8, which I'm guessing might need a little mod work to narrow the throat a bit. Their low-end capability looks great even with no waveguide, but some directivity control would be useful.

[TN Allen]

Please include the depth if possible. Thanks

[augerpro]

What is the 6x9 waveguide?

[xmax]

One tweet Pete says can play lower is the SB29RDAC

So I will be getting some asap.

[xmax]

Update on the tweeters going low concept. Pete S and I came up with a design based around the B&C 8BG51 and the Satori TW29R,
With a 6X9" Elliptical WG in a small ported cab combined with the mighty Tymphany STW-350F in a sealed box using active xo between
8" and sub for now. The 3 drivers are going to live in a box exactly the same size as a Genelec 1038, creating a massive 3 way in a kind
of classic 3 way look. This concept came together after hearing about Pete's 2 way using the same B&C and a WG.

What I have learned so far... First and foremost SB tweets don't like going low even with the "discounted lunch" of the big 6X9", 1.5"
deep WG even though I have been listening them a lot and like many aspects of their sound the high distortion has to be fixed.
Why use a SB tweet that can't swing low in the first place? Because A: the dimple dome tweets seem to work much better in this
big deep WG and B: the extra little top end the Satori has helps with the normal loss you get in that region with a guide.

Great things about system thus far, awesome low end! Real "sub" box will end up being smaller (more ideal). Also
the B&C with the passive XO (5.6uh and .6uh and 22uf cap) has a bump in the 150 range which makes it very
easy to blend with the STW-350 which surprisingly plays nicely up to 250ish! From 30 to around 1K is perhaps
the most cohesive low/low-mid I recall hearing. Part of the design concept includes being able to easily "tune"
out boundary related nulls in the 80-250 range.

Back to "Tweeters in low places" a big WG (and soon) a tweet that can go low allows bigger mid-basses
which in turn allows lower XOs to woofs or subs. Pushing both XOs down makes possible a simplified
3 way full range system that can and will be played much louder that anybody should!

Also the deep WG very closely aligns the acoustic centers of the drivers helping this design image very well indeed!

Things to improve: Lower the "bump" at 150hz possibly making an adjustable Z correction circuit (Pete idea)
.Improve speed and or power response of 8" 800-2K range. Perhaps going to try Epique or looking at the other
B&C models in that range.

Biggest problem is the tweet distortion, perhaps a different woofer can play a little higher and be able to raise tweet
filter frequency. Pete Modeled the XO and I don't think it can be improved upon without changing 1 or both drivers.
I think the Satori 9.5 won't cut it but maybe the 7.5" version?

Pete's XO is 3rd order electrical at about 1.1K! And the THD is unfortunately about 20dB higher than it should be around 1.1K.