The problems are not with the drivers. It was in the application of the drivers.

I have used those drivers in designs recently (the planar drivers) and they are quite good when used in a proper application.

http://av123.com/index.php?page=shop.product_details&flypage=shop.flypage&product_id=34&category_id=18&manufacturer_id=0&option=com_virtuemart&Itemid=37

I crossed the planar mids in the 650Hz to 700Hz range and this was about as low as they really liked playing. This was also to a smaller woofer and with steeper slope than what was used in the VMPS speakers. So they didn't have phase related issues.

Danny, you said you have experience with this driver, but HOW could you ?
I thought VMPS had an exclusive on this driver from some Drago Dude ?

I remember me talking to Bruce Thigpen about this driver, and the Neo magnets Drago put in it.
Bruce designed the driver.
He told me it was a fine balancing act between a lot of things, and a more powerful magnet was not always desirable ?

So Danny, the driver is ok, but how it is used is the problem ?

Jose, I see you have or had the RM 30's.
I never heard them, but the RM 40's I was glad to see go.
The RM 40's had a thin, disembodied sound, UNLESS I turned the midranges down, WAY down.
Then, they became VERY inefficient, and voices jumped out of 10 inch woofers.

The adjustability of the VMPS product IMHO provides a convenient excuse for the poor performance I experienced.
After all, IT WAS ME who couldn't get them right, LOL

BTW, Brian had me BANNED from his forum when I started asking too many questions.
I started playing/suggesting mods on the VMPS forum, TRYING to make the RM 40's more tolerable.
Next thing I knew, I found myself banned by the owner of Audio Circles.
I ONLY went on the VMPS Forum on Audio Circles, and Brian never complained about me, at least NOT to my face.
He had the OWNER of Audio Circles send me a PM on Audio Circles in the VMPS forum.
The OWNER of Audio Circles flamed me in a PM, NEVER identifying who he was.
I Flamed him right back, presto, I was banned.
I KNOW Brian Cheyney was behind this!
I confronted him with this, and he denied it, but I ain't stupid.
I said "Brian, it is YOUR Forum, and I am YOUR customer"
Stick up for me.
He did not.
EVERYTHING I was Banned for happened in a PM between me and the owner of Audio Circles, who never identified, NOT out in public.
It was all a big set up because I was QUESTIONING VMPS on his forum, LOL
In MY mind, all I was doing was trying to get the POS VMPS RM 40's to sound right.

I have YEARS of experience playing with equalizers.
NOT to use them permanently, but to see what peaks and dips in different frequencies sounds like.

I have noticed that a thinness in the 100 to 600 hz range makes speakers image all over the place, and provide a SUPER detailed sound.
Unfortunately, it don't sound like music.
I hear a HOLE in the VMPS RM 40's.
I see a flawed speaker design.

To FIX the VMPS RM 40's, here is what I WAS going to do.

I was going to use two different 10 inch woofers to fit the "alignment", if you want to call it that, LOL
Then, I was gonna use a Rane 24 db electric crossover.

The vertical separation on the RM 40's two 10 inch woofers IS a PROBLEM.

I think we calculated comb filtering above 250 hz ?

I was gonna try experimenting with the crossover frequency, and steep slopes.

I WAS talking about this when I got banned from VMPS Forums.

Like they say Danny, "If you can't convince them with brilliance, baffle them with BS, and SUPRESS the truth"

Chris

The short answer to the last question is that you can't, but I am guessing that you have already figured that out.

Chris> "Danny, you said you have experience with this driver, but HOW could you ? I thought VMPS had an exclusive on this driver from some Drago Dude ?"

Obviously the advertised exclusivity was exaggerated. I have a few of them in stock. There are actually a couple of companies that make them now.

Chris> "So Danny, the driver is ok, but how it is used is the problem ?"

I will confirm that it is a great driver. I think you already know the rest by now.

I am really sorry to hear about your treatment, but if I gave you any advice it probably wouldn't go over too well, would it.

And as Fred has suggested, you might want to keep your posting here more on line sources and less on all of that other stuff.

So, in your opinion, HOW low can this midrange driver be used ?

VMPS used to use this driver down to 166 hz, according to it's ads.
Now, it is 288 hz.

HERE is what I am asking Danny ?

I am no crossover expert, just an audiophile.

But I thought that to use a driver down to 166 hz, like VMPS used to do, it must be happy PLAYING an octave below that ?

That would mean the VMPS NEO MIDRANGE DRIVER would have to play down to 80hz, maybe eveb receive some baffle support, huh ?

Is what I beieve about a crossover correct ?
OR Danny, can VMPS make it's 10 inch midrange driver perfectly fill in for the missing part of the crossover ?

It is "said" the VMPS putty system adjusts the Q of the driver, well maybe so.

But what would putty have to do with the roll off ?

I THOUGHT the 10 inch VMPS midrange Drivers roll off was determined by magnets, cone type, etc, etc.

HTF can Putty make a 10 inch midrange driver roll off differently.

The Fs averages between 175Hz and 200Hz. So typically you shoot to cross it an octave above that or with a steep enough slope to have the output down about 20db before hitting it's Fs.

Chris> "Is what I beieve about a crossover correct ?"

I think you pretty much have it figured out by now.

Chris> "But what would putty have to do with the roll off ?"

Adding or taking away mass to a PR changes the Fs of the PR and changes the tuning frequency of the box. It will alter the bottom end of its range. It will not alter the upper end of the range.

Also changing the mass a gram or two at a time is like changing the port length of a port by a fraction of an inch at a time. You won't hear a change.