TangBand 75-1558SE on a Waveguide with Measurements

[davepellegrene]

Re: TangBand 75-1558SE on a Waveguide with Measurements

Link doesn't work for me . . . :(

Not sure why my phone isn't posting it right. Other then I'm out in frigid temps and my phone doesn't like that. I'll repair it when I get home.

Dave

[augerpro]

Re: TangBand 75-1558SE on a Waveguide with Measurements

A big waveguide is out of the scope of my project Dave, but be sure to post the results here, I'd like to see what it looks like.

[davepellegrene]

Re: TangBand 75-1558SE on a Waveguide with Measurements

Here is a pic of the polar from the guide from my earlier post


Here is the distortion at 90 dbs EQ'd flat and rolled off on the bottom end


Pic of the guide


Here is the overlapped mid/ tweeter guide. This gets a 12 woofer so the 11" wide mid guide should work well.


Dave

[davepellegrene]

Re: TangBand 75-1558SE on a Waveguide with Measurements

The double guide is hard to make out since it's clear. Clear is the cheapest and easy to work with.

[Thumper Tom]

Re: TangBand 75-1558SE on a Waveguide with Measurements

How close on the dome are you going? I have placed the edge of my guide at the edge of the surround.

[davepellegrene]

Re: TangBand 75-1558SE on a Waveguide with Measurements

How close on the dome are you going? I have placed the edge of my guide at the edge of the surround.

The throat is 3-1/8".

[JochenM]

Re: TangBand 75-1558SE on a Waveguide with Measurements

Really great to this idea of a molded mid-high waveguide starts to become real.

I'm with Tom regarding the throat diameter:
What I've found on the internet are the dimensions Klein&Hummel use for the O410 (now Neumann KH410)

HT Oval: 180mm x 120mm (the complete ellipse,
HT throat diameter: 39mm (for a custom version of the Seas H883 27TAFC/G)
HT depth: 34mm

MT Oval: 260mm x 180mm (using the Dynaudio D76 3" dome)
MT diameter: 93mm
MT depth: 46mm

I'm looking forward how this turns out always with one finger on the "buy now"-button (I do have a pair of 1558SE waiting to get used).

Jochen

[TN Allen]

Re: TangBand 75-1558SE on a Waveguide with Measurements

Dave, I'm curious about the cross sections of your guides in the photos, have you measured or delineated these?

The double guide is hard to make out since it's clear. Clear is the cheapest and easy to work with.
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[dlneubec]

Re: TangBand 75-1558SE on a Waveguide with Measurements

Dang Dave, you're getting pretty good at this!:applause:

The double guide is hard to make out since it's clear. Clear is the cheapest and easy to work with.
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[ATTACH=CONFIG]44233[/ATTACH]

[davepellegrene]

Re: TangBand 75-1558SE on a Waveguide with Measurements

Dave, I'm curious about the cross sections of your guides in the photos, have you measured or delineated these?

Only thing I measure is the mouth, throat and depth. The radius is a natural curve that forms on its own. Change any of the three measurements and the radius changes with them.

Dave

[TN Allen]

Re: TangBand 75-1558SE on a Waveguide with Measurements

Thank you!

Only thing I measure is the mouth, throat and depth. The radius is a natural curve that forms on its own. Change any of the three measurements and the radius changes with them.

Dave

[augerpro]

Re: TangBand 75-1558SE on a Waveguide with Measurements

I think I have a usable waveguide now. Very simple 3/4" deep, 3/4" chamfer, and 3 13/16" throat. And after a lot of baffle sims and a few prototypes to see just how well the sims' results work with an actual crossover in place, I measured on the final baffle design. My 3 way will move forward now: 8" Peerless HDS woofer (for now), hopefully a Transducer Lab tweeter, and one version with the TB dome mid and another using the BG Neo8. Here is a pic of the mockup of the final baffle, raw response of the TB, and after a LR4 bandpass crossover is in place at 700hz and 2600hz:





Not sure if I'll do anything about the higher frequency response peak. I was listening to this (and a few other drivers) unfiltered the other day and it sounds really smooth, the higher frequencies just melt away. No wonder midband distortion is so low.

[JochenM]

Re: TangBand 75-1558SE on a Waveguide with Measurements

Really great to this idea of a molded mid-high waveguide starts to become real.

I'm with Tom regarding the throat diameter:
What I've found on the internet are the dimensions Klein&Hummel use for the O410 (now Neumann KH410)

HT Oval: 180mm x 120mm (the complete ellipse,
HT throat diameter: 39mm (for a custom version of the Seas H883 27TAFC/G)
HT depth: 34mm

MT Oval: 260mm x 180mm (using the Dynaudio D76 3" dome)
MT diameter: 93mm
MT depth: 46mm

I'm looking forward how this turns out always with one finger on the "buy now"-button (I do have a pair of 1558SE waiting to get used).

Jochen

Well I do quote myself this time.
I found a imho interesting drwaing of the Neumann KH410 that goes along with the measurements in the quote above.


Source:http://www.neumann-kh-line.com/klein-hummel/globals.nsf/resources/o410_cad_20071007.pdf/$File/o410_cad_20071007.pdf

[augerpro]

Re: TangBand 75-1558SE on a Waveguide with Measurements

Looks a lot like Dave Pellegrene's waveguide design, have you seen that?

BTW I have the Transducer Lab tweeters ont eh way Everything is proceeding as I have foreseen...Going to take some vacation this month to pound these out, along with the 9 bookshelf TM's and 3 MTM's I was working on today.

[JochenM]

Re: TangBand 75-1558SE on a Waveguide with Measurements

Looks a lot like Dave Pellegrene's waveguide design, have you seen that?

Absolutely. And regarding the fact that Klein&Hummel/Neumann were the first ones with waveguides like that for dome mids, Dave is right on track.
They made about 200 prototypes for the O500 back in 2000 I think.