Advent Legacy II Speaker Driver

[Jerry G.]

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.
======

 

[Phil Allison]

"Jerry G."

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.

** 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

 

[Jerry G.]

Thanks kindly! This was very helpful.

--

Jerry G.
======


"Phil Allison" <philallison@tpg.com.au> wrote in message
news:5k14vdF1n0k6U1@mid.individual.net...

"Jerry G."

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.

** 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