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Multi-Way Conventional loudspeakers with crossovers

DIY PMC MB2 clone
DIY PMC MB2 clone
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Old 13th August 2017, 11:10 AM   #11
C37 is offline C37  Belgium
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Found it, it's Bushmeister Great Balls of Prestige. A great read and project
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Old 13th August 2017, 11:52 AM   #12
wae is offline wae  Netherlands
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AND.... there is a new Volt 2" midrange, the 527 that might better suit your taste. Volt Loudspeakers | VM527 (2″ Midrange Dome).

Looks more smooth (is this english?? ) than the 3"

kind regards,

Frans
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Old 13th August 2017, 02:01 PM   #13
pkitt is offline pkitt  United States
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Just wanted to make some comments. A TL is not really difficult to design if you have good modeling software and know how to use it (and don't get hung up on several "myths" about what is required in a TL). Martin King's software is still available and he will provide you with it if you join his Yahoo group [quarter-wave@yahoogroups.com]. The Leonard Audio software is usable and gives similar results to those from King's software, but isn't quite a finished or polished product. Of course not every driver will work well in a TL. And, my last comment (unless more come to mind later) is that the driver (woofer) in a TL should never, ever be located at the very beginning of a line, like shown in the drawings early in this thread, unless it's strictly a subwoofer being crossed low.
Paul
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Old 13th August 2017, 08:26 PM   #14
WalterPPK is offline WalterPPK  Netherlands
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Yes C37 I have seen the Balls of Prestige. Very nicely done, and a huge improvement! I have been thinking to incorporate something like that but I'm afraid it will be very difficult. The mid dip was somewhere around 2,5khz. Is it not possible to cross the tweeter lower to avoid the dip? When I place the Volt near the side of the cabinet, would that improve the fr?
pkitt, The TL software looks very promising. Perhaps I will try a TL for another smaller project so I can familiarize myself with it.

Last edited by WalterPPK; 13th August 2017 at 08:34 PM.
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Old 16th August 2017, 01:52 PM   #15
WalterPPK is offline WalterPPK  Netherlands
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I contacted Volt to ask them about the fr of the VM752. They told me that there has been a very recent design update to have an improved fr. It is now similar to the 2" version (VM527). This is not yet updated on their website.
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Old 16th August 2017, 03:23 PM   #16
WalterPPK is offline WalterPPK  Netherlands
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The units are placed as close as possible to each other. The design now looks like this:

Click the image to open in full size.
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Old 16th August 2017, 05:51 PM   #17
WalterPPK is offline WalterPPK  Netherlands
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Click the image to open in full size.

Last edited by WalterPPK; 16th August 2017 at 06:04 PM.
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Old 17th August 2017, 12:06 PM   #18
WalterPPK is offline WalterPPK  Netherlands
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Here is the idea of the inside:

Click the image to open in full size.

I'm not sure wether I should make brace between the central brace and the baffle. Maybe that would improve the stiffness of the baffle?
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Old 17th August 2017, 01:49 PM   #19
WalterPPK is offline WalterPPK  Netherlands
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Inside with more detail:

Click the image to open in full size.

Click the image to open in full size.

And the outside again:

Click the image to open in full size.
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Old 18th August 2017, 10:49 AM   #20
Charles Darwin is offline Charles Darwin  United Kingdom
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Looking good but two things:

The way the drivers are arranged you want to use them landscape rather than portrait.
Tweeter and mid should be vertically aligned to minimize comb filtering and thus widen the sweet spot.

If you can try and slant the bracing. If you can't do not put in in the middle of a panel, offset it a bit. Use a material different from the external panels ie ply for the external and MDF for the bracing and use a glue that does not set solid to fix it.
It all helps reducing unwanted vibrations.
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