In Reply to: RE: Any interest in a 32 ohm speaker? posted by hitsware on May 3, 2014 at 15:22:58:
Well our experiences have been different, so we've come to different conclusions... like that never happens!! I will look for that difference in resonant frequency impedance bumps that you observed next time I run measurements though - I hadn't noticed it, but that may well be because I wasn't looking for it.Unfortunately there are some significant technical hurdles when it comes to building a practical 32 ohm woofer: When we increase the voice coil's DC resistance, the Qes will go up proportionately... UNLESS we also increase the BL.
There are two ways that we can increase the BL: We can make the magnet more powerful (which is expensive and has practical limits); or we can increase the number of turns of the voice coil inside the magnetic gap.
If we increase the number of turns in the magnetic gap by making the wire thinner, thermal power handling goes down rapidly. If we increase the number of turns in the magnetic gap by making it a multi-layer voice coil, the voice coil inductance and moving mass both go up, the former inevitably rolling off the top end, and the latter trading off efficiency but gaining low-end extension in return.
My point being, like everything else in speaker design, high impedance woofer design is a juggling of tradeoffs. The best we can hope for is to be informed jugglers, and/or catch our mistakes early!
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
Edits: 05/03/14
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Follow Ups
- RE: Any interest in a 32 ohm speaker? - Duke 16:44:48 05/03/14 (0)