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Multi-Way Conventional loudspeakers with crossovers

Troels' PMS (multilayer assembly) build thread
Troels' PMS (multilayer assembly) build thread
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Old 29th November 2009, 09:32 PM   #11
WaveFlex is offline WaveFlex  France
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Picture regrouping the different parts not being peripheral.

On top one of the elements forming the rear of the cabinet.

Then one element forming the front of the cabinet.

And last the elements for the front where the front-plates for the drivers are situated.

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Old 29th November 2009, 11:21 PM   #12
WaveFlex is offline WaveFlex  France
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Let's finish the floor-stand:

The bottom-plate with 2 alloy brackets that will help to securely fix the floor-plate assembly to it
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Connecting plates in the grooves of the bottom-plate, hold in place by 4 x 4mm screws
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The finished assembly, grooves filled with a mixture of glue and woodsaw (had some left actually ), alloy brackets in place
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First binding post
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And both of them
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Old 29th November 2009, 11:35 PM   #13
cuibono is offline cuibono  United States
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Wow, really amazing. A lot of planning!

How thick is the MDF sheet, 25mm? Do you worry about the dimensional stability of the MDF at all?
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Old 29th November 2009, 11:58 PM   #14
WaveFlex is offline WaveFlex  France
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Some pics of the crossovers:

Caps in // with ferrit core selfs
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Old 30th November 2009, 12:03 AM   #15
WaveFlex is offline WaveFlex  France
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Quote:
Originally Posted by cuibono View Post
Wow, really amazing. A lot of planning!


How thick is the MDF sheet, 25mm? Do you worry about the dimensional stability of the MDF at all?
Yes, MDF is 25mm is this case but not restrictive at all, thicker plates can be used. Dimensional stability has been taken into account, as an example I might quote "front-plate adjustments" ...
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Old 30th November 2009, 12:06 AM   #16
WaveFlex is offline WaveFlex  France
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Creating component sub-assemblies for the mid-tweet crossover

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Old 1st December 2009, 09:09 PM   #17
WaveFlex is offline WaveFlex  France
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Installation of the cross-over components on the perspex boards. Holes are drilled to hold the components in place with zip ties.

Placement and orientation of the coils are as per the observation of Troels on his website. Have a look here:Placement of coils in crossover networks:

Figure 6 applies for the central coil to the 2 outer ones and figure 1 for the outer ones to each other.
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Cutting the perspex board and drilling the holes
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Holes drilled
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Some parts installed
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All of them installed
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Old 1st December 2009, 10:29 PM   #18
WaveFlex is offline WaveFlex  France
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Every cleaned up (more or less) for soldering the cross-overs
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First one done
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Some hot melt glue helps holding wires and parts in place
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Finished cross-over
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The other one. Looks just the same, besides the white colored tape (no particular reason, I only ran out of black one)

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Old 2nd December 2009, 04:27 AM   #19
Andersonix is offline Andersonix  Sweden
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Troels' PMS (multilayer assembly) build thread
Waveflex, it looks like you're doing wonderful work. Seems like pre-stressed concrete in a way once you tighten down the threaded rod?

But it appears you have weakened the loudspeaker where it needed strength the most: at the baffle openings. Perhaps there is bracing to compensate? (I understand that you were trying to improve airflow.)
(The same might apply to removing material from the center of the angled legs?)
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Old 2nd December 2009, 12:10 PM   #20
WaveFlex is offline WaveFlex  France
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Quote:
Originally Posted by Tosh View Post
Waveflex, it looks like you're doing wonderful work. Seems like pre-stressed concrete in a way once you tighten down the threaded rod?

But it appears you have weakened the loudspeaker where it needed strength the most: at the baffle openings. Perhaps there is bracing to compensate? (I understand that you were trying to improve airflow.)
(The same might apply to removing material from the center of the angled legs?)
Thanks for your appreciation of the project Tosh.

I will post the assembly of the different parts shortly, as mentioned earlier in this post there's indeed some bracing. Honestly airflow was not really an issue as far as the legs are concerned...
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