Wisdom Audio LS4, inner workings

[Baldin]

Found this very interesting clip from CEDIA 2011, on Wisdom Audio LS4
CEDIA 2011: Wisdom Audio Series LS4 Speaker Review - YouTube

There is a very good description on it's inner workings, and some good cutaway pictures.

Also interesting how they use reticulated copper foam in the tweeter section to help heat disipation.

See also attached picture taken from the video clip.

Best regards Baldin



PS. Here is a source for reticulated copper foam http://www.ergaerospace.com/Copper-properties.htm

[JAMESBOS]

$100,000, I'LL GET 2 !£*&^(BLIMEY.I'M GLAD I BUILD MY OWN.

[Baldin]

Henry, that was the point of posting this: Learn from the pros and build it yourself

[Few]

Thanks, Baldin, for sharing that. It answers a couple of questions I've had over the last couple of weeks. This thread started with a question answered in the video: Wisdom provides one example of a central tweeter in a planar magnetic system.

A close look at the cut-away speaker also answers another question I've had: Does it make sense to run a single conductor between pairs of magnet columns like Magneplanar does, or is it advantageous to run two or more conductors between each magnet column? Clearly the answer depends on how long the conductor is and what the target impedance is, but the Wisdom example seems to show two conductors running down each magnetic gap. I think the Analysis planar-magnetics have gone a similar route. Doubling the conductor length, all else being equal, should increase the sensitivity (greater BL product).

I think I'll forgo the reticulated copper in my design. I don't really need to generate 130 dB. Yikes!

Thanks again,
Few