Would anyone know, the DC resistance for the main driver, and the impedance of the main driver used in the Advent Legacy II speaker box?
I know that the total speaker unit is rated at 6 ohms. I need to know the bass driver's DC resistance.
Thanks.
-- Jerry G. ======
"Jerry G."
** 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 used.
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 !!
...... Phil
Thanks kindly! This was very helpful.
--
Jerry G. ======
"Jerry G."
** 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 used.
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 !!
...... Phil
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