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Old 14th December 2009, 03:12 PM   #11
tinitus is offline tinitus  Europe
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Seas once made drivers with copper plated poleplates, and ditto phase plug

Back then I thought of it like advertising design feature
Now I know it wasnt just that
It does make a real differense
Whether its significant and worth the cost is a different matter

Regarding rising response
Many fullrange drivers seem to be troubled with that, shortrings or not
I would think the absense of baffel step comp is more of an issue, especially with fullrange drivers
You really need drivers with a falling response, which points at less efficient drivers
May be something like coated cones
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Last edited by tinitus; 14th December 2009 at 03:19 PM.
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Old 12th January 2010, 02:38 PM   #12
pjanda1 is offline pjanda1  United States
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It's true that you'll have a rising response with most fullrange drivers. However, it is possible to balance the right amount of rise with the impedance rise and an off axis listening position, netting a more or less flat in-room, in-system response. The problem is when you introduce a shorting ring, you often get too much rise to balance out that way. Then, the only way to approach a flat response is with a large, heavily furnished room and a cabinet that provides gain way into the midrange.

It would be nice to have drivers that provided some BSC (didn't Dan Wiggins do that?), but it would still have to occur at a fixed point. So, you'd be limited to baffles in a certain size range or you'd risk a lump or dip. On the other hand, we don't tend to be that obsessed with perfectly flat in the FR world. It's not as if the BIB's cabinet gain sums perfectly with the baffle step, yet most of us are happy.

You would, for the most part, be looking at higher mass, lower efficiency fullranger. And that brings with it it's own set or tradoffs.

Paul
Wild Burro Audio Labs - DIY Full Range Speakers
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Old 12th January 2010, 02:45 PM   #13
badman is offline badman  United States
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Quote:
Originally Posted by pjanda1 View Post
It's true that you'll have a rising response with most fullrange drivers. However, it is possible to balance the right amount of rise with the impedance rise and an off axis listening position, netting a more or less flat in-room, in-system response. The problem is when you introduce a shorting ring, you often get too much rise to balance out that way. Then, the only way to approach a flat response is with a large, heavily furnished room and a cabinet that provides gain way into the midrange.

It would be nice to have drivers that provided some BSC (didn't Dan Wiggins do that?), but it would still have to occur at a fixed point. So, you'd be limited to baffles in a certain size range or you'd risk a lump or dip. On the other hand, we don't tend to be that obsessed with perfectly flat in the FR world. It's not as if the BIB's cabinet gain sums perfectly with the baffle step, yet most of us are happy.

You would, for the most part, be looking at higher mass, lower efficiency fullranger. And that brings with it it's own set or tradoffs.

Paul
Wild Burro Audio Labs - DIY Full Range Speakers
That response rise vs. inductance is an issue that can also go the other way. Current sources deliver more voltage into inductive top ends. This puts the way the rise behaves on a spectrum, from voltage------current sources and more-----less top end with a shorting ring in place.

Really, though, a single shorting ring around the base of an undercut pole goes a long way- it's the symmetricity we're after, more than anything else, we want to kill the Le(Xmax) increase on inward stroke
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