Duelund Web Based Filter Calculation Software

[chrismercurio]

Found this:

http://pro.speakerbuilder.dk/synkron/

Here:

http://www.duelundaudio.com/News.asp

Chris

[JonMarsh]

Hi Chris,

Yes, a new poster dropped in on the BG Ribbons thread and posted a link to that, too.


mkc's post


Thanks for posting an "official" announcement instead of hijacking a thread like the rest of us do!

[mkc]

Hi guys,

We have also made a similar 4-ways calculator, but it hasn't been uploaded yet.

I have been toying with the idea of trying out a 3-way. I have made a measurement of the Monacor SPH-130, recommended by Duelund. The frequency response has been posted in the danish forum. I wil try to upload it here tommorow. It's an unmodified unit, but Duelund did a few modifications to the unit, which I will try.

I'm glad you are back Jon.

Best regards,
Mogens

[chrismercurio]

Jon,

In all fairness I did look for a "Duelund" thread before starting the new thread and couldn't find a good place to "jack". I didn't want to encroach on the 3-way design thread.

Chris

[JonMarsh]

NO complaints at all from my side, Chris, what you did was the "right way".

Mogens, thank you very much for bringing this to our attention, and any other Duelund related information.

BTW, I was just reading Tony Gee's caps review, and comments on the Duelund VSF and Cast capacitors- having used and become familiar with some of the other European caps he discusses at length, it creates an interesting reference point for his comments, as his views on the various Clarity and Jantzen caps pretty closely mirrors my experience. And sets the stage for his recommendations for the Duelund caps. OTOH, my budget hasn't really quite caught up to this kind of level, but it gives me ideas of where to look and listen next.

[Face]

IMO, the VSF's are worth the $$$.

[mkc]

Hi All,

Here is the my measurement of the Monacor SPH-130, which is a resonably cheap unit and cost ~$60. I know some of you don't consider this cheap, but here in Europe even Vifa, Peerlees, Scan-speak and Seas, costs more than you guys are charged.

It is measured with my Kim Girardin microphone, Edirol EX-1 and SoundEasy. I also have a M-Audio 192 as Jon, but I don't think it will make much difference here. I'm in the process of making a Linkwitz modified microphone to be able to make distortion measurements. I'm trying to resist the temptation to buy the ACO 7012, as Jon has :cry:

Anyway, the measurement conditions are:
- 1 meter on axis.
- Sealed cab of ~15 Liter.
- Baffle size 26 cm x 37.5 cm
- Unit mounted@ x = 13 cm, y = 17cm.
- All edges 45 degrees
- Measurement without any smoothing.

There is a dip at ~12 KHz, as can be seen from the picture. It might be addresses by one of the modifications Duelund advice. I might get a chance to measure a modified version, modified by Duelund himself or else I will modify one of my own units.

You might want du look at the pictures in this forum. There even is pictures of Duelund himself. The text is in danish, but I will be happy to answer questions, to the best of my ability.

http://www.nerds.dk/?page=viewforum&f=12

Also, I will talk to Henrik, the owner of the website where we have the Duelund "calculator" and see if we can get the 4-way version up. I'm the guy with the complex numbers, so please blame me, not Henrik if I have made a mistake.

Best regards,
Mogens

[TacoD]

NO complaints at all from my side, Chris, what you did was the "right way".

Mogens, thank you very much for bringing this to our attention, and any other Duelund related information.

BTW, I was just reading Tony Gee's caps review, and comments on the Duelund VSF and Cast capacitors- having used and become familiar with some of the other European caps he discusses at length, it creates an interesting reference point for his comments, as his views on the various Clarity and Jantzen caps pretty closely mirrors my experience. And sets the stage for his recommendations for the Duelund caps. OTOH, my budget hasn't really quite caught up to this kind of level, but it gives me ideas of where to look and listen next.

I used a 8.2 uF Duelund VSF copper foil capacitor, and yes they sound differently than Mundorf Silver/Gold (top offering of Mundorf) but imho they are not as neutral sounding.

These Duelund caps are to my ears sounding like the Mundorf Silver Oil cap/ Jensen P.I.O/ <fill in your oil based cap> with the resolution of a top notch film cap (e.g. gold).

I think you can better invest in a nice set of cabs/ drivers :-).


I checked the Duelund x-over website, very nice!

[Face]

A friend and I recently swapped out a few different caps on my tweeters. We found the copper VSF's to sound the most natural and to also have the biggest soundstage. One of the other caps were Mundorf S/O, and in both of our opinions, they do not sound similar to VSF's.

The next besting sounding cap after the VSF's were Clarity MR's. They don't don't have the natural timbre of the VSF's and are a little more forward, but are more dynamic and are quieter. I love the MR's in my Tannoy's though.

[mikec]

Is this a thread about the Duelund crossover topology or caps that the Duelund brand sells under their own name? :scratchhead:

Seems like a separate thread is in order.

[JonMarsh]

Well, perhaps my mention of the Duellund and the follow up of caps is out of order, but I think discussion of the Deullund crosover and drivers suitable for it is quite within the reasonable purvey.

I'll consult with Thomas; we may rename the thread to "All Things Duellund", if that doesn't bother anyone. Being a recent user of the some of the higher end Clarity and Jantzen caps, the discussion re Duelunds and the newer Clarity MR is interesting to me, too, for an upcoming project.

[JonMarsh]

Hi All,

Here is the my measurement of the Monacor SPH-130, which is a resonably cheap unit and cost ~$60. I know some of you don't consider this cheap, but here in Europe even Vifa, Peerlees, Scan-speak and Seas, costs more than you guys are charged.

It is measured with my Kim Girardin microphone, Edirol EX-1 and SoundEasy. I also have a M-Audio 192 as Jon, but I don't think it will make much difference here. I'm in the process of making a Linkwitz modified microphone to be able to make distortion measurements. I'm trying to resist the temptation to buy the ACO 7012, as Jon has :cry:

Anyway, the measurement conditions are:
- 1 meter on axis.
- Sealed cab of ~15 Liter.
- Baffle size 26 cm x 37.5 cm
- Unit mounted@ x = 13 cm, y = 17cm.
- All edges 45 degrees
- Measurement without any smoothing.

There is a dip at ~12 KHz, as can be seen from the picture. It might be addresses by one of the modifications Duelund advice. I might get a chance to measure a modified version, modified by Duelund himself or else I will modify one of my own units.

You might want du look at the pictures in this forum. There even is pictures of Duelund himself. The text is in danish, but I will be happy to answer questions, to the best of my ability.

http://www.nerds.dk/?page=viewforum&f=12

Also, I will talk to Henrik, the owner of the website where we have the Duelund "calculator" and see if we can get the 4-way version up. I'm the guy with the complex numbers, so please blame me, not Henrik if I have made a mistake.

Best regards,
Mogens

Thanks for the link and the measurement. What was your gating time for this measurement?

[mkc]

Hi Jon,

I seem to remember that it was little less than 4 mSec. The gray area indicates the window size.

If you are interested, I could make a combined near- and far-field measurement or perhaps just a near-field? Let me know.

One of Duelunds modifications is to remove the dustcap and replace it with a new one, which is cut out from a ping-pong ball (right word?). Some of the voice-coil former is sticking up through the diaphragm. This is cut down and the new dustcap is glued inside the former to stiffen this. Duelund found that the former has a tendency to "wobble" or not stay round and this modification should minimize this.

I don't know if this is going to minimize the dip at 12-13 KHz. The voice-coil diameter is 25 mm, which is 1 wavelength@13.7 KHz. I really hope I can get a chance to borrow and measure a modified unit, next week.

Best regards,
Mogens

[JonMarsh]

Hi Jon,

I seem to remember that it was little less than 4 mSec. The gray area indicates the window size.

If you are interested, I could make a combined near- and far-field measurement or perhaps just a near-field? Let me know.

One of Duelunds modifications is to remove the dustcap and replace it with a new one, which is cut out from a ping-pong ball (right word?). Some of the voice-coil former is sticking up through the diaphragm. This is cut down and the new dustcap is glued inside the former to stiffen this. Duelund found that the former has a tendency to "wobble" or not stay round and this modification should minimize this.

I don't know if this is going to minimize the dip at 12-13 KHz. The voice-coil diameter is 25 mm, which is 1 wavelength@13.7 KHz. I really hope I can get a chance to borrow and measure a modified unit, next week.

Best regards,
Mogens

I'm sure borrowing and measuring a modified unit would be much easier.

A suggestion to consider re your measurement, something interesting would be somewhat near field measurement with a longer gating window; then the LF response and high frequency response could be in good perspective without too much work.

I've gotten the last of the parts in today that have been on order, so I hope to do some testing this weekend. This afternoon (I'm on holiday for a change) I'm inventorying materials and supplies for a possible new speaker project. So far, so good.

[Hank]

Jon, you must have the bewildered feeling of a newly-released prisoner after a couple years on the chain gang. Measure away!

[JonMarsh]

Jon, you must have the bewildered feeling of a newly-released prisoner after a couple years on the chain gang. Measure away!

Yeah, not sure I'm recognizing my surroundings or what these tools are for! Woke up at three AM this morning, thinking about details of a complex baffle design for the MTMWW that I've started thinking about. (The Indra clone has morphed into more of a Point Consulting Tyhpoeus clone). And the new SS tweets came in yesterday, too.

Now, I've got to dig a few older well known drivers, too, for correlation, because I'd really like to try using Fuzzmeaure 3 for these tests (which I used a lot on the NeoD CC project), since it would be much quicker to get setup than unpacking and setting up my Praxis rig.

[1Michael]

It's good to see you back around Jon

[JonMarsh]

Thanks! Let's see if I can actually get something useful done! I have some more time off scheduled over the next two months, so I'm tentatively hopeful! I certainly haven't run out of ideas, yet... :W :B