Any 3-way using Vifa P11MH09 out there?

[GOWA]

I was given a pair of Vifa P11MH09 mids as a gift and would like to use them in a 3-way. Does anyone know of an existing design out there?

Thanks

 

[MJL21193]

Hi,
I recently bought them to use here in an active 3-way I've built.
These mids are very good, you won't be disappointed with their sound.

 

[Andy G]

Blackwood uses the M11WH or is WG.. same'o for mids.

Very nice clean mid. Try to use it open back if you can, you will love them !!!

http://members.optusnet.com.au/~gradds55/ARGOS/blackwood.html

 

[MJL21193]

Very nice clean mid. Try to use it open back if you can, you will love them !!!

I'm in complete agreement - open backed mids do sound better.
I'm considering chopping a big hole in the back of mine! How to do it and make it look like that's the way I planned it? Do you think a bunch of 1" holes will do the trick?

 

[Andy G]

you don't want the frame on a 5" more than about 3" deep, or you will get cavity resonances, which is exactly what you don't want !!

 

[MJL21193]

How about the holes and some stuffing? Chamber isn't very deep (maybe 6" at the bottom, 3" at the top.

 

[Andy G]

line the insides of the sides with some 'stuff"

 

[MJL21193]

I have the inside lined with the styrofoam wedges and found that this was not effective, so I was adding some polyfil stuffing with the speaker playing. Taking the mid out and just holding it in my hand while I put the stuffing in showed an improvement in the sound. I thought :too bad I didn't make these open back".
So I may try it.
I'll need a couple of stiff drinks to get my nerve up enough to drill holes into my finished cabs

 

[Andy G]

Chain Saw !!!

 

[MJL21193]

Chain Saw !!!

Nah, chain saws too subtle. Shaped charge with 1kg of Semtex.

 

[Andy G]

got pics of speaker's behind?

 

[MJL21193]

got pics of speaker's behind?

Here. I've pasted on a few "holes" for effect. Maybe better to carefully route out a rectangular hole with a recess around it to accept a cloth grill.

 

[Andy G]

is there a shelf inside for the woofer cabinet
if so, a good first step would be to remove the whole of the back above the shelf.

 

[MJL21193]

Yes a shelf, BUT I would also like to put in a rear firing tweeter. I've brought it up over in the speaker thread. Maybe further conversation on this over there? We're cluttering up GOWA's thread.

 

[GOWA]

Will this work?

Any input is appreciated. I hope the picture works.

 

[GOWA]

Here is the layout.

 

[GOWA]

Normalized.

 

[GOWA]

Impedance / Phase

 

[GOWA]

Delay

 

[Moondog55]

Hi GOWA,
just my half cents worth but why pad down the mid-range??
I'm sitting on a few ot these myself that got at the right price and I've been looking for suitable designs myself.
I woud have thought sacrificing SPL in the midrange was a mistake, correct me if am mistaken here but if the mids were higher in SPL than the woofers would it not be better to add 3dB by adding an extra woofer??
Ted