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Johnny
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Location:
Sydney, OZ
Registered:
May 2002

Re: Car Audio Amplifiers Watt Rating

Fri, 06 February 2004 07:34

Quote:

there is no direct ratio between the two values it depends on the amp.

For voltage and current,Max to RMS, multiply by 1 over the square root of 2, but as we know Power is Voltage x Current, So working it out, max->RMS is 1/2 Max power. The problem comes when Dodgey Brands state, Dodgey figures....

Quote:

Also... you questioned whether the Jaycar amp would be "too powerful" for your 6x9's. There is really no such thing.... if you read any decent audio article by any real authority you will know that an amp rated above a speakers input limits is better than one below its rated input limit.
Why is this? Clipping. An underrated amp will clip the outputs to raw DC voltage when pushed too hard and destroy your speaker VERY QUICKLY.

Sorry Witzl, Disagree with this, Clipping occurs by pushing the sine wave (ie sound waves) gain above that of the amps rail voltages (car voltage) ie make it flat, by using an overrated amp more voltage and current, hence power will heat your poor speakers coils up more and you will see puffs of smoke very quickly, as well as making the movement of the speaker on minimum gain well in excess for it to cope... more or less 'clipping' the speaker. In this instance, I'm talking about hooking up a 50w RMS speaker to a 100w RMS amp. Also a quick rule is that for every decrease in 100 watts RMS, you'll will lose 1db when completely tuned.... It is a dB is log scale, but this is good for a quick cal..... So if your taking in account '6x9' rated at Max 250W (125W RMS),and I have never seen one yet rated properly, as they are more like 50w when you read the fine print, hooking these up to a 25w amp, you'll have 92db rather than 93... our ears are only able to tell a 5db difference, so we won't know. Also, you'll have to consider that to make High freqency sound, takes less energy then that of low. So a small, say 25wRMS, amp is great for most full range, 4',5 1/4' splits, and some 6,6 1/2 splits. Medium size, we'll say 35-50W RMS will run most small subs, mid-bass,(6.5'-10') and some larger ones, above this, well these are the heft regions of competition style stuff....
In the end what your talking about Witzl, is an improperly tune amp, and when run like this, it just sounds crap, and can also destory the amp, not the speaker... and sometimes Both!!

Quote:

NOTE: i work at jaycar, and have worked in car audio for some time.

I won't hold this against you Smile

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