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Old 8th September 2003, 07:46 PM   #1
Kees is offline Kees  Netherlands
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Default Spice - speaker load simulation

I'm doing spice simulations on a new amplifier design.
I want to use a realistic loudspeaker equivalent.
I'm thinking of a 4 Ohm resistor with an L in parallel and a C in series.
What are reasonable values for L and C ?
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Old 8th September 2003, 11:04 PM   #2
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Default Re: Spice - speaker load simulation

Quote:
Originally posted by Kees
I'm doing spice simulations on a new amplifier design.
I want to use a realistic loudspeaker equivalent.
I'm thinking of a 4 Ohm resistor with an L in parallel and a C in series.
What are reasonable values for L and C ?

see Douglas Self's book...
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Old 8th September 2003, 11:29 PM   #3
toshiba is offline toshiba  Germany
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Hi Kees,

it's not easy to write a simulation model of a reactive speaker. But you can do worst case simulations for inductive and capacitive load. see attachment.
Both loads are designed for 4 ohm. Phase angle for inductive load should be about +60 degrees and for capacitive load about -60 degrees over audio bandwidth.

toshiba
Attached Files
File Type: zip loads.zip (8.5 KB, 196 views)
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Old 9th September 2003, 12:06 AM   #4
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Rod Elliot had a fairly complete equivalent circuit for a speaker (complete with crossover network) in one of his latest articles. Might be a starting point.
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Old 9th September 2003, 12:08 AM   #5
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of course, the great breakthrough in speaker design was transposing mechanical impedances into electrical ones -- somehow I recall my first physics prof (and he was a priest) relating Hooks' "spring" equations to the design of a brassiere.
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