Heissmann DXT-Mon-182

[Digital_Thor]

I am pretty sure Heissmann measurement is gated and near field merged while the other is only smoothed. But the deviation is there in the same way I have it.

And if I remember correctly - when I wrote with him - he measured in an empty hall, where he could have the speaker and microphone up in the air, so that all reflective surfaces was far away - so closer to ideal.

 

[Digital_Thor]

Kii3 and Grimm are active/dsp driven and heissmann's measurements IMO look too flat to be real.

Then what about this one:
https://www.hifialex.de/next-monitor/

This:
https://www.seas.no/index.php?option=com_content&view=article&id=380:idunn&catid=66&Itemid=365

Or this:

https://zelfbouwaudio.nl/forum/download/file.php?id=189007

It measures pretty good, for what it is. I have a set too, and they measure the same - even though I've used in an active system - measured at home

 

[Vuki]

Then what about this one:
https://www.hifialex.de/next-monitor/

This:
https://www.seas.no/index.php?option=com_content&view=article&id=380:idunn&catid=66&Itemid=365

Or this:

https://zelfbouwaudio.nl/forum/download/file.php?id=189007

It measures pretty good, for what it is. I have a set too, and they measure the same - even though I've used in an active system - measured at home

Tnx!

 

[Digital_Thor]

But do be careful about baffle design. The Seas DXT is very sensitive to the shape of the front of the cabinet, and "like" it narrow or with very slanted shapes.
This is because the waveguide is so small, and from around 3kHz and down, the sound will be controlled by the front baffle and not the waveguide - but you will typically cross it around 1,8-2kHz, so you need the cabinet to be this narrow or very slanted, so that the sound from the DXT only comes from the driver itself - hope it makes sense.

I build a small narrow cabinet with steep angled cuts along the DXT, and crossed it at 2kHz 24LR with an SB Satori MW13TX - then put that little "monitor" on top of a cabinet with two 8" woofers crossed at 400Hz - worked well
IMO the midranges with a harder cone, are much smoother and extended off-axis response, which makes it easier to EQ and cross to the tweeter.

A quote from Heissmann:

"
Nowadays the straightening behavior of loudspeakers is getting more and more important. The Seas DXT stands out in this discipline from the competition. No other known tweeter of this size shows as uniform straightening as the Seas DXT.


However, a careful baffle design is required to maintain this behavior. In "normal widths" baffles (~ 20cm) for example. the Seas DXT tends to widen significantly at angles around 3kHz.


Work very well: a practically nonexistent ... or a very wide baffle."

 

[Vuki]

I'm building large 2way "bookshelf" (45 lit) with sb wo24tx & dxt. Xover @1,8khz. Front baffle is 42cm wide.

 

[Digital_Thor]

Then I would not use the DXT - unless you try to copy the Grimm audio - which is 52 cm wide and with very rounded sides - important too.
Read the whitepaper:
https://www.grimmaudio.com/publications/speakers-white-paper/

Check this too:
https://www.audiosciencereview.com/...ss-anyone-using-it-yet-or-plans-to-use.51721/

And this:
https://www.madisoundspeakerstore.c...aker-kit-by-jeff-bagby-and-javad-shadzi-pair/

He crossed at 1300Hz.

I have the Satori WO24P and it is a very nice driver - use it for bass though up to 400Hz, but you will have a challenge with baffle design - and maybe it could be easier with an Augerpro waveguide and the SB26ADC - which I also have - mine in a 5" waveguide - and that is a really good driver.

https://www.somasonus.net/sb-acoustics-sb26

The great thing about the bigger waveguide, is that you can almost make a fully square speaker box - easier, and have very few problems with diffraction.

But correct me if I'm wrong - you want to listen very near field or normal listening distance of 2-4m?

 

[Vuki]

Then I would not use the DXT - unless you try to copy the Grimm audio - which is 52 cm wide and with very rounded sides - important too.
Read the whitepaper:
https://www.grimmaudio.com/publications/speakers-white-paper/

Check this too:
https://www.audiosciencereview.com/...ss-anyone-using-it-yet-or-plans-to-use.51721/

And this:
https://www.madisoundspeakerstore.c...aker-kit-by-jeff-bagby-and-javad-shadzi-pair/

He crossed at 1300Hz.

I have the Satori WO24P and it is a very nice driver - use it for bass though up to 400Hz, but you will have a challenge with baffle design - and maybe it could be easier with an Augerpro waveguide and the SB26ADC - which I also have - mine in a 5" waveguide - and that is a really good driver.

https://www.somasonus.net/sb-acoustics-sb26

The great thing about the bigger waveguide, is that you can almost make a fully square speaker box - easier, and have very few problems with diffraction.

But correct me if I'm wrong - you want to listen very near field or normal listening distance of 2-4m?

Well, it works.. I can share measurements when back home.

 

[Digital_Thor]

Well, it works.. I can share measurements when back home.

Great, do that, I'm always curious and interested in experience and data

 

[Digital_Thor]

Maybe this one can be of inspiration too... quite wide baffle, though he does not show much off-axis....

https://www.audiosciencereview.com/...seas-excel-nextel-8-inch-with-seas-dxt.59073/

 

[suttondesign]

I decided to avoid the actives like genelec and neumann since (1) I have so many amps and minidsp dsp things, (2) passive speakers are not nearly as likely to fail, and (3) it seemed like the heissmanns could readily be eq’d to achieve about as good a FR as the actives. I also plan to experiment with an active crossover in the minidsp flex 8.

At the end of the day, the Heissmann seemed to excel at having minimal distortion at high spl above, say, 120hz, and I plan to cross them over to my Linkwitz open-baffle bass modules from the lx521.4. That bass module has a lovely sound quality. The Heissmanns will sit atop these, creating an effective 3-way.

 

[mcdn]

That bass module has a lovely sound quality. The Heissmanns will sit atop these, creating an effective 3-way.

It does have an amazing quality. I run them with LXmini mains, and despite some theoretically atrocious positioning they give slam and punch in abundance.

 

[Vuki]

Here it is. SB wo24tx + Seas DXT, @ca. 1 - 1,5m. Bellow ca 1kHz room does it's thing. The box is in prototype phase, but it already sounds OK.

 

[Salt]

Xover is fine, so far .

 

[suttondesign]

What does the forum think about using wago connectors for connecting crossover components, esp. where the crossover will be outboard in an equipment closet?

 

[bmc0]

Should be fine as long as they're spec'd for the lead/wire size. Lever (Wago) connectors make gas-tight connections, just like properly done crimps.

 

[digitalfrost]

Wago rocks.

 

[suttondesign]

Wago rocks.

I know. My local hardware store in Bellingham stocks them, and they're so easy to use.

 

[suttondesign]

Here is my crossover layout on a 12" x 12" acrylic sheet, with an attempt to avoid any interference between magnetic fields for the inductors. Anyone who has pointers, please advise.. Remember, it will be outboard in a closet, so it's okay if it's spacious. I plan to put this in a plywood box.

 

[suttondesign]

Update:

In my preliminary test of the crossover with different drivers (a "full-range" 4" tweeter/mid and 6" mid), but using the Heissman crossover frequency of 1950hz, when I use Roon to insert high and low pass filters at 1950hz and 36db slopes, I get almost complete silence, just a tiny band of sound around the crossover frequency. So that checks out. Removing either filter allows the correct driver to dominate.

 

[suttondesign]

Okay, here it is, my first crossover, with everything strapped down or glued in. Comments/advice/critique welcome. It's going to be outboard, so I have no need to make it small.