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DC offset level to avoid speakers damage-

Dear All would you help me to understand this?
My actual power amp has very low DC offset.

I understood that Pass aleph renomated amps that i am targeting have a quite high offset in the range of 50mV.
Something to be worried about ?

Which is the max tolerated level from a speaker ? Which kind of damage can occour ?
Any speaker is more sensitive ?
Tks
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Showing 1 response by gs5556

gs5556
1,244 posts
 
The maximum dc offset tolerated by a speaker is a percentage of the linear excursion of the driver that is acceptable, usually 10 to 15%. The formula used is:

Vdc(max) = % excursion x excursion x driver impedance/[Force Factor x Suspension Compliance]

All these parameters are found in the manufacturer's spec sheets. Using a Scan-Speak 21W/8555-0 driver, the maximum dc offset at 10% of driver excursion is:

Vmax = 10/100*6.5mm*5.5-ohms/[8.2*1.34] = 400mV.

Most amps specify dc offset at less than 100mV. So a 50mV offset is not "high". And a lot of drivers tolerate up to 500mV.
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