BG NEO3 - Dipole capabilities

[sam_s]

Is there a consensus as to the minimum xover freq for the NEO3 in a dipole situation?

Zaph only measured it with the backing cup on, stating that dipole operation was 'far too overdamped in that case, and I recommend leaving the rear chamber installed'. To me that means it has a long, gradual rolloff that starts high. However it's not apparent to me what this means in terms of implementation restrictions.

To boot, rumor has it these things blow easily, leading me to believe their advertised minimum freq of 2khz is too low.

Think I could get away with 2.5khz LR4, dipole?

Sam

[Paul Carmody]

> To boot, rumor has it these things blow
> easily, leading me to believe their
> advertised minimum freq of 2khz is too low.

I am hearing that, too. I am very curious what is causing this. I'd hate to lose that kind of money because of a loud passage (or wiring brain fart). I noticed that Dennis Murphy crosses it at 2000 Hz on his "Plop in the Box" design, though it looks to be crossed with a pretty steep slope.

[scottsehlin]

My RS150-Neo3PDR design is crossed at about 1950 Hz, but I used a 3rd order electric filter, which gives approximately a 6th order LR slope. I haven't had or heard of any problems - and there are at least several pairs out there - but I wouldn't push it any further. This is with the back cup attached - I don't have a good point of reference for the Neo3 in dipole mode.

[Paul Carmody]

That was a nice little speaker! A good showcase for both drivers.
I was wondering if you had heard anything about this "blowing" of BG Neo3s. Apparently not. That's reassuring.

[Wolf]

> That was a nice little speaker! A good
> showcase for both drivers.
> I was wondering if you had heard anything
> about this "blowing" of BG Neo3s.
> Apparently not. That's reassuring.

I haven't heard that either. I have heard of the magnetics, whether plating or sheeting separating from the bar magnets. A fellow poster stated that he could not hear a difference, but he did not have a measuring rig to verify it was or not.

I still find them one of the best sounding tweeters, or at least of the ones I've auditioned.
Later,
Wolf

[sam_s]

> My RS150-Neo3PDR design is crossed at about
> 1950 Hz, but I used a 3rd order electric
> filter, which gives approximately a 6th
> order LR slope. I haven't had or heard of
> any problems - and there are at least
> several pairs out there - but I wouldn't
> push it any further. This is with the back
> cup attached - I don't have a good point of
> reference for the Neo3 in dipole mode.

Yeah Scott, that lil' bookshelf of yours fascinated me last fall in IA. Couldn't remember how you crossed it though. But now I have *some* kind of point of reference. If you can do 2khz 6th order, I'm fairly certain LR4 @ 2.5khz would be fine too.

Regardless, I'm just going to have to jump in, buy a pair,and start measuring

Thanks!!

Sam

[jonasz]

Where can I find info about your design?

Thanks...

> My RS150-Neo3PDR design is crossed at about
> 1950 Hz, but I used a 3rd order electric
> filter, which gives approximately a 6th
> order LR slope. I haven't had or heard of
> any problems - and there are at least
> several pairs out there - but I wouldn't
> push it any further. This is with the back
> cup attached - I don't have a good point of
> reference for the Neo3 in dipole mode.

[davidroberts]

Provided Link: Adire DDR


> Is there a consensus as to the minimum xover
> freq for the NEO3 in a dipole situation?

> Zaph only measured it with the backing cup
> on, stating that dipole operation was 'far
> too overdamped in that case, and I recommend
> leaving the rear chamber installed'. To me
> that means it has a long, gradual rolloff
> that starts high. However it's not apparent
> to me what this means in terms of
> implementation restrictions.

> To boot, rumor has it these things blow
> easily, leading me to believe their
> advertised minimum freq of 2khz is too low.

> Think I could get away with 2.5khz LR4,
> dipole?

> Sam
Dan Wiggins with Adire did a dipole with the Neo3 and the Extremis woofers called the Adire DDR. It used 6th order slopes at 1800hz.
Right now I am running a GR Research design that uses 2nd order electrical filters at 1800hz and have had no problems out of it. I would link to the design but it is not posted at this time.

[DougP]

Provided Link: IOWA diy 2007


> Where can I find info about your design?

> Thanks...

Here is a link to the Iowa 2007 DIY page Scott's speaker is about halfway down the page. It is far from a full write-up but it does give some good info.

Doug

[Jim Holtz]

Scotts Neo3 design was one of my favorites in it's class. I've not been kind to the Neo3 planar in the past. I'm not a big fan of the planar sound signature but I really enjoyed Scott's implementation. I thought it was very well done and didn't have the planar sound that I don't care for. I would recommend it with out hesitation...

My $.02 worth...

Jim

> Here is a link to the Iowa 2007 DIY page
> Scott's speaker is about halfway down the
> page. It is far from a full write-up but it
> does give some good info.

> Doug