how much distortion is present when sub reaches xmax

[nauc 10+ year member]

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[PhatTonyDeMarco 5,000+ posts]

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[JimJ 5,000+ posts]

Depends on motor structure, amplifier topology...

 

[Cris 10+ year member]

this is an extremely vague question that calls for more specifics. What subs? what amps? etc etc.

 

[nauc 10+ year member]

just in general

say a 12w6v2 and a 500/1

are we talking about 1% distortion or like 50% distortion

 

[squeak9798 5,000+ posts]

*Generally* most subs are at around 10% at Xmax.

Obviously different factors affect this. But that's "in general"

 

[thch 10+ year member]

firstly, i think you'd have to stipulate there would be no IMD for ease of analysis. and that Kms and Le are flat -- thus only Bl related distortion. further, distortion is only related to F(x) and not F(x,t), because that would be more difficult to analyze.

it seems you should be able to do this with basic calculus. find average Bl in a range to find the theoretical power without distortion in that range. then make a curve of (BL(x) - avg) and use that to find the power in distortion.

if BL is a linear function for output -- eg if you could hold everything else equal and double BL to get double acoustic intensity then:

distortion = 100 * integral ( (BL(x) - avg)^2 ) / (Xmax * (avg)^2)

avg = integral (BL(x)) / Xmax

both times integrateing over -xmax/2 to +xmax/2

i think that works out correctly.

of course Kms will also add distortion.