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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: RE: Wow - I stand corrected! posted by Steve Schell on July 12, 2007 at 14:06:05:
>Although I haven't measured it, I would also expect the dynamic compression of a driver with a hot motor to be greater than one running at normal temperature.
Hi Steve,
What makes you think that? The resting voice coil temperature will stabilize with the field coil and that will cause different parameters than with the field coil cold but energized, but beyond that, given power dissipations in the coil should cause the same temperature rise in the voice coil which would cause the same increase in DCR. Actually I'd think that a hot field coil might have less compression, as the same increase in DCR would be a smaller percent change relative to rest (with the hot field coil), so would cause less compression. I don't think this would be a very big difference though. However, I must admit it's been a while since I reviewed heat transfer so I could be wrong, and I don't have time to look it up right now.
Other than that, you're definitely right - you're adding the temp rise of the field coil to the voice coil, so depending on what the insulation's like, you could be asking for trouble.
John
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Follow Ups
- RE: Wow - I stand corrected! - John Sheerin 15:58:27 07/12/07 (2)
- RE: Wow - I stand corrected! - Steve Schell 20:43:10 07/12/07 (1)
- RE: Wow - I stand corrected! - amnesiac 23:33:37 07/12/07 (0)
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