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Multi-Way Conventional loudspeakers with crossovers

DIY PMC MB2 clone
DIY PMC MB2 clone
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Old 26th November 2017, 07:44 PM   #131
WalterPPK is offline WalterPPK  Netherlands
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Andy and Charles, it's a lot of wool. The whole filling of a B&W DM6 is in the box. This seems to be an interesting read What I can do Is leave one box empty and measure both to see the difference and subsequently choose the right amount of filling. Wouldn't you recommend filling the box?

Hugo, indeed it's a SCM45 clone slightly larger with bigger woofers and more amplifier power. It should go an octave deeper than the SCM45 which is -2dB at 70Hz. Simulation says -2dB at 36Hz for the Valtori. Maximum spl for the SCM45 is 109dB (I very much doubt it will put out the lower octaves with this spl). Max SPL for the Valtori will be 112dB>50Hz and 108dB@30Hz (this is also optimistic )

Last edited by WalterPPK; 26th November 2017 at 07:57 PM.
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Old 26th November 2017, 08:32 PM   #132
andy19191 is offline andy19191  Europe
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I haven't read the article but the pictures are of the right sort of thing so it is likely to be a reasonable source of guidance. The box needs to be stuffed enough to remove the internal resonances but not too much to hinder the operation of the port. The stuffing needs to be densest in the middle to be most effective at damping the internal resonances and not stuck to the walls as you often see done.
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Old 26th November 2017, 08:58 PM   #133
WalterPPK is offline WalterPPK  Netherlands
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Thanks for the advise Andy.
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Old 27th December 2017, 01:39 PM   #134
enricofiocco is offline enricofiocco
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Great project Walter! Have you done some measurement? regards
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Old 3rd January 2018, 02:59 PM   #135
WalterPPK is offline WalterPPK  Netherlands
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Happy new year everybody. It's been a while. The speakers are finally (almost) finished. The contour came in and I have gotten an old laptop from the attic with windows xp on it and installed the 5.8 software. Amazing device. Real time adjustments via an ethernet cable. Virtually endless amounts of dsp power. We set it up with near linear phase xovers. After days off listening and dialing I set the crossovers at 450hz and 2kHz. The speakers sound best with the mids out of phase and the woofers and tweeters in phase. This was also confirmed in the FR plots where the mids in phase create a notch dip at the xovers.
I played with the delay but I'm not sure what to do with it. The FR is the smoothest if I leave the delays alone.

FR on the listening spot at the desk:

Click the image to open in full size.

Astonishing deep bass and very dynamic even at low volume. And they can play loud. Our previous Dynaudio M1.5 could play loud but these speakers have more headroom and can hit you in the chest if necessary. They are not aggressive to listen to.
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Old 3rd January 2018, 03:42 PM   #136
Charles Darwin is offline Charles Darwin  United Kingdom
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Congrats!

Looking good and by your comments sounding good as well.
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Old 3rd January 2018, 04:27 PM   #137
hugo stiglitz is online now hugo stiglitz  Germany
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would you mind posting a picture of the finished speakers? graph looks great
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Old 3rd January 2018, 05:44 PM   #138
WalterPPK is offline WalterPPK  Netherlands
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Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 6th January 2018, 01:34 PM   #139
hugo stiglitz is online now hugo stiglitz  Germany
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oh wow .. those look sexy! congrats!
may I ask what drivers you used?
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Old 6th January 2018, 06:47 PM   #140
WalterPPK is offline WalterPPK  Netherlands
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Thanks Hugo. 2x parallel SBA Satori 9,5" WO24P8, 1x Volt VM752, 1x SBA Satori TW29RN-B. Xover 450hz & 2kHz

Changed the mid back in phase. It seemed better at first but when you move around the sweetspot the sound changes too much.
There is still too much hiss coming out of the speakers even with the in and outputs muted. The signal is way too hot for the Aragon which puts out maximum power at 1,42V (+5,4dBu).
The lake is +21dBu so I was thinking of soldering a -15dB pad in the cables to reduce the hiss and maximize the dynamic range. The output impedance of the lake is 50 Ohm. The input impedance of the Aragon is 20kOhm. Still have to figure out the right resistor values.
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