Hi everyone,
I read a lot of threads and posts, but could not find an answer to my dilemma, hence the new thread.
I just removed the dust caps of 4 x Vifa p11wg midwoofers and installed some handmade phase plugs, using Planet10's approach - wood screws to hold it to the pole piece. The point is the pole piece is vented, there is a small, maybe 6mm hole to the back of the driver.
With the dust cap gone should I plug the pole piece vent with maybe foam or leave it as it is?
Also the VC diameter is 25mm and the plugs that I made from wooden dowels are 25mm too, is this gonna be a problem because of the tight clearance between VC former and the plug and should I use a slightly smaller diameter plug?
Thanks for your input.
Stan
I read a lot of threads and posts, but could not find an answer to my dilemma, hence the new thread.
I just removed the dust caps of 4 x Vifa p11wg midwoofers and installed some handmade phase plugs, using Planet10's approach - wood screws to hold it to the pole piece. The point is the pole piece is vented, there is a small, maybe 6mm hole to the back of the driver.
With the dust cap gone should I plug the pole piece vent with maybe foam or leave it as it is?
Also the VC diameter is 25mm and the plugs that I made from wooden dowels are 25mm too, is this gonna be a problem because of the tight clearance between VC former and the plug and should I use a slightly smaller diameter plug?
Thanks for your input.
Stan
Thanks for the reply Hunter, but drilling holes next to the VC former does not appeal to me very much.
I was thinking maybe the gap between the VC and the phase plug would provide enough ventilation, considering that the area of that gap would be greater than the area of a 6mm hole, but I might be wrong.
Anyone with an idea on this?
Cheers
Stan
I was thinking maybe the gap between the VC and the phase plug would provide enough ventilation, considering that the area of that gap would be greater than the area of a 6mm hole, but I might be wrong.
Anyone with an idea on this?
Cheers
Stan
With the phase plugs installed you can get the same cooling effect from the gap between the plug and the coil.
The plug should cover the vent, but you can stuff them if you want.
Let us know of improvements due to reduction of resonances in VC and vent.
There needs to be sufficient clearance between plug and boce coil for it to move freely. 0.5 mm gap is a good minimum
dave
The plug should cover the vent, but you can stuff them if you want.
Let us know of improvements due to reduction of resonances in VC and vent.
There needs to be sufficient clearance between plug and boce coil for it to move freely. 0.5 mm gap is a good minimum
dave
Thanks Dave,
This is very encouraging, I will try 23-24mm corks instead of the wooden dowels, it should provide the 0.5mm gap on each side, and will also block the vent with some foam.
Will report back re. listening tests.
Stan
This is very encouraging, I will try 23-24mm corks instead of the wooden dowels, it should provide the 0.5mm gap on each side, and will also block the vent with some foam.
Will report back re. listening tests.
Stan
If you are drilling holes into the steel of the pole assembly or magnet assembly you will create an nightmare of steel shards and debris inside the voice coil!
Sorry , I thought you had de -magnetized the motor structure and opened up the top and pole plate , if you have not you can try the thingy in the next drawing - suranjan
No apologies required. 🙂
I just saw an opportunity for a small disaster.
However, I have to wonder about another thing. If you put a steel screw at the base of the plug, that would distort the field geometry of the magnet structure somewhat, would it not?
The effect is negligable. There might be enuff metal in the steel socket phase plugs to thou.
dave
Hello.
In the DIYer world of home listening thermal effect are not issue.
But you have to keep close the way between the inside and outside of the cabinet.
So if you replace the dust cap by a phase plug, you have to close the vent in the pole, and you can't do it with a vented voice coil former.
In the DIYer world of home listening thermal effect are not issue.
But you have to keep close the way between the inside and outside of the cabinet.
So if you replace the dust cap by a phase plug, you have to close the vent in the pole, and you can't do it with a vented voice coil former.
Hi folks,
yesterday I made a new set (x4) of phase plugs from a brand new broom handle, which measured 24.2mm diameter, blocked the holes of the pole piece vents and had a rather quick listening session.
How can I describe it - it definitely sounds different, I think now the speakers are slightly louder, there is more "air" in the music, sounds more open, maybe the integration around the x-over point is better, more uniform. Just to mention, this is a 1st order series x-over at 3 KHz. Of course these are 2 way speakers and the results will be different from fullrangers, but I think overall the phase plugs are an improvement.
I'll be playing more music this weekend and see.
Stan
yesterday I made a new set (x4) of phase plugs from a brand new broom handle, which measured 24.2mm diameter, blocked the holes of the pole piece vents and had a rather quick listening session.
How can I describe it - it definitely sounds different, I think now the speakers are slightly louder, there is more "air" in the music, sounds more open, maybe the integration around the x-over point is better, more uniform. Just to mention, this is a 1st order series x-over at 3 KHz. Of course these are 2 way speakers and the results will be different from fullrangers, but I think overall the phase plugs are an improvement.
I'll be playing more music this weekend and see.
Stan
Hello.
It could make sense, because the modified driver should have less off axis attenuation, so the filter could have better off axis integration, so in the room too.
It could make sense, because the modified driver should have less off axis attenuation, so the filter could have better off axis integration, so in the room too.
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