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- Advent Legacy II Speaker Driver
- Jerry G.
September 2, 2007, 1:54 pm
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Re: Advent Legacy II Speaker Driver
** Look for one of the US web forums that specialise in old Advent speaker
restoration and post your Q there.
A speaker system rated as being " 6 ohms nominal " can be expected to have a
nominal 4 ohm woofer installed - the system impedance will fall to 4 ohms
only around the 250 to 400 Hz region, assuming a sealed box like the Advents
A nominal 4 ohm woofer will have a DC resistance of close to 3.3 ohms.
The ratio of copper wire resistance to resistive AC impedance around 250 to
400 Hz is circa 1:1.2 for the vast majority of bass drivers.
The additional 20 % *resistive* loss is due to the combination of friction
loss in the surround & suspension, eddy current loss in the pole piece and
last of all, radiated sound energy !!