108Views8Replies

Author Options:

i need a circuit for my car stereo (sony, 52Wx4ohm) because i am not getting it's current ratings? Answered

8 Replies

user
Re-design (author)2010-09-23

Please clarify your question. Are you saying you need to find out the current requirements or it's not putting out it's rated power. Or something else?

Select as Best AnswerUndo Best Answer

user
orksecurity (author)Re-design2010-09-23

Why do you think there's a problem?

Note that if you're trying to measure the current, remember that the rating is *PEAK* wattage. Since human hearing is nonlinear (exponential, if I remember correctly) and since the signal spends very little of its own time at the maxima/minima of its range, you will not often draw the full 52W -- and you should be happy about that, since when you hit that limit the signal clips and sounds awful.

Not to mention that you should be able to deafen yourself quite adequately without hitting that limit, assuming reasonably efficient speakers.

Select as Best AnswerUndo Best Answer

user
steveastrouk (author)orksecurity2010-09-23

Also, the rating is RMS, there is no such thing as peak power is there ?

Select as Best AnswerUndo Best Answer

user
Re-design (author)steveastrouk2010-09-23

There is in "sales literature".

Select as Best AnswerUndo Best Answer

user
orksecurity (author)Re-design2010-09-24

... which is where one finds this sort of number.

Select as Best AnswerUndo Best Answer

user
NachoMahma (author)orksecurity2010-09-23

> human hearing is nonlinear (exponential, if I remember correctly)
Logarithmic

Select as Best AnswerUndo Best Answer

user
orksecurity (author)NachoMahma2010-09-24

Thanks. "Wait. Strike that. Invert it." That's what I get for posting without checking.

Select as Best AnswerUndo Best Answer