Reply to thread

Message

<blockquote data-quote="goodsound" data-source="post: 1353892" data-attributes="member: 565204">RMS power is not simply 70.7% of&nbsp; max or continuous power.RMS power is the product of &#039;RMS voltage&#039; and &#039;RMS current&#039;.And RMS voltage and current are indeed 70.7% of their max values.And this applies to ANY electrical system, car or non-car, audio or non-audio!Your trusty $50 DMM does not measure RMS voltage and current. It measures peak or most likely average, which is different from RMS, and even that is accurate only within a very small range of frequencies (typically upto 400hz or 1000hz). Thats why true-rms voltmeters that work in a wide frquency range are expensive.Continuous power of an amp is the power it can deliver continuously without clipping.Continuous power of speakers is the power they can handle continuously without getting toast.Peak power is the power your amp can deliver (or your speakers can handle) for very small period of time (milliseconds) like a loud piano key or drum etc.. spikes which are typically +9db to +12db from your set volume level.Now you have to be careful what the manufacturer has listed for continuous and peak power . Is it RMS or non-rms ? If they have not specifically listed RMS then simply reduce the power to half.</blockquote>

[QUOTE="goodsound, post: 1353892, member: 565204"] RMS power is not simply 70.7% of max or continuous power. RMS power is the product of 'RMS voltage' and 'RMS current'. And RMS voltage and current are indeed 70.7% of their max values. And this applies to ANY electrical system, car or non-car, audio or non-audio! Your trusty $50 DMM does not measure RMS voltage and current. It measures peak or most likely average, which is different from RMS, and even that is accurate only within a very small range of frequencies (typically upto 400hz or 1000hz). Thats why true-rms voltmeters that work in a wide frquency range are expensive. Continuous power of an amp is the power it can deliver continuously without clipping. Continuous power of speakers is the power they can handle continuously without getting toast. Peak power is the power your amp can deliver (or your speakers can handle) for very small period of time (milliseconds) like a loud piano key or drum etc.. spikes which are typically +9db to +12db from your set volume level. Now you have to be careful what the manufacturer has listed for continuous and peak power . Is it RMS or non-rms ? If they have not specifically listed RMS then simply reduce the power to half. [/QUOTE]

Verification