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Multi-Way Conventional loudspeakers with crossovers

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Old 27th June 2013, 07:15 PM   #1
usul27 is offline usul27  Switzerland
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Default LoudSnail

I've started with a new loudspeaker project. Form is similar to the B&W nautilus, but it will be a small 2 way system (any maybe another full-range).

I did some milling tests today:
Click the image to open in full size.
I have to optimize the CNC workflow, there are still some problems with the precision (not a problem of the CNC machine, but with the clamping).

More on the project in my blog:
http://www.crazy-audio.com/tag/loudsnail/

Last edited by usul27; 27th June 2013 at 07:17 PM.
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Old 5th July 2013, 01:31 PM   #2
usul27 is offline usul27  Switzerland
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After several hours of milling, one can see how it should look like:
Click the image to open in full size.
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Old 5th July 2013, 01:40 PM   #3
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Nice work. You should consider using a high density (700kg/m3+) modelling board instead of laminations of MDF. You'll get a better finish for this sort of thing.
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Old 5th July 2013, 01:49 PM   #4
usul27 is offline usul27  Switzerland
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Do you mean PU modeling board like this: Polyurethane (PU) 580 Model Board Tooling Block in High Density - Easy Composites

Looks interesting, but is relatively expensive. Also I'm not sure if I can mill 50mm thick boards in one step.

There is still a lot of work to do for the final finish.
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Old 5th July 2013, 02:34 PM   #5
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any calulations?
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Old 5th July 2013, 03:55 PM   #6
usul27 is offline usul27  Switzerland
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Volume is about 3 liters which is a bit too small for the Omnes MW5. I will use an active crossover (MiniDSP) and use the equalizer to correct this. The low frequency cutoff frequency will be somewhere between 80 and 120 Hz, depending on the amount of equalization. The driver should work up to about 2.5-3kHz.

Most likely the tweeter will be this QAE tweeter:
http://quint-audio.com/qaudio/files/nt1-497-8qa_.pdf

Yes, this thing needs an additional subwoofer (I have some design ideas for this too)
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Old 6th July 2013, 12:42 PM   #7
6.283 is offline 6.283  Germany
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Hi Daniel,

have seen your work over in the German forum as well. Nice work !

The tweeter in itself is interesting. However, it would not mate very well with the Omnes 5", which starts to beam around 1KHz. So you will see a very pronounced jump in the directivity at the cross-over freq., say around 3KHz.
A 4" mid or even a 3" and a tweeter that can be crossed very low would yield a much smoother off-axis response, which is very important.
In the other forum you said it is a project for fun. But I see it is a lot of work and maybe it is worthwhile to re-think the design approach ?
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Old 7th July 2013, 09:08 AM   #8
usul27 is offline usul27  Switzerland
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3 and 4" woofers are not possible in this housing. Therefore I have to stick with the Omnes. However if there are recommandations for a tweeter that could work from 1.5kHz, this would be an option. One critical point is the size. The diameter of the whole tweeter should not exceed 5cm (smaller is better). There is a nice tweeter from Scan Speak. Unfortunately is is very expensive. I still have some small Dayton tweeter somewhere. I have to check what crossover frequency would be possible with these.

Any other tweeter recommendations?
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Old 7th July 2013, 02:13 PM   #9
6.283 is offline 6.283  Germany
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I also had something like the ScanSpeak in mind.
Other than that, a 2" FR driver might work if you can control the rear radiation (i.e. absorp).
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Old 7th July 2013, 02:20 PM   #10
usul27 is offline usul27  Switzerland
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Hmm, didn't think about a small FR driver, but that might be an option. The Visaton BF32 could be an interesting candidate.
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