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[Tim McCulloch]

Correct and maybe the reason why we should take the time to define the differences here. I'm not sure the 835 is actually "slot "loaded per say. However, my belief is that the mid range drivers of the Vertec arrays are truly slot loaded per the industry definition. But like I said above, now I'm FUBAR.

There is a phase plug-like device that fits up to the cone (but doesn't touch it), that channels acoustic energy to the slots.  It's 3D, so there is more to this than just slotted openings on the front side.  One could argue that the slots themselves are a HPF, but I think the phase plug has as much or more to do with any physical HPF.  I've never measured the MF without VerTec v4 processing, so I can't say what the RBI does, or does not do in terms of filtration.

I'm a "ghost" spotlight operator for the next week, so I'll see if I can learn more about how the RBI® works.  I'm pretty sure JBL has a patent for it.

Edit additions:  yep, it's patented.. http://www.google.com/patents/USD450778

The abstract doesn't explain exactly what it does or how, but there are good drawings to give you an idea of the device.

FWIW, in an early JBL press release regarding VerTec, it describes the midrange exits as "slotted."  If you read that back in 2001 or 2002, I understand why you say it now.

[Bob Leonard]

I was beggining to think I was loosing it altogether. Yes, the slots in front of the MR drivers, two (2) per driver. I had thought they manipulated the LF compression, but what do I know about arrays. Not much. Thanks Tim.

[Tim McCulloch]

I was beggining to think I was loosing it altogether. Yes, the slots in front of the MR drivers, two (2) per driver. I had thought they manipulated the LF compression, but what do I know about arrays. Not much. Thanks Tim.

My understanding of the RBI is that it helps the MF and HF play nice together off-axis.  JBL uses the RBI concept (but not necessarily this exact implementation) in other products, so it's not just about vertical arrays.

Relax, Bob.  This wasn't a pop quiz. ;-)

[Bob Leonard]

I understand it's no quiz but I would like to learn more, especially if it's people like you doing the teaching.

[ProSoundWeb Community]