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- Thread starter sunseeker
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then power = v^2/R

(I just confirmed yesterday that I rarely use more than 2 watts peak, Ive got 12db of headroom for my headroom 🙂 )

Sean

Well, to measure actual amplifier power output, you take a true RMS voltmeter and put it in parallel with the speaker, and a true RMS ammeter and put it in series. Then you measure both current and voltage and multiply them. Note that very few ammeters have negligible resistance and almost none of them will read much over 10 Amperes.

If you want to compare amps, a much safer way to do it is with an appropriately sized dummy load. I think you will find that measuring amplifier output voltage is much more simple. Then you can estimate the output power as Power = volts^2/dummy load resistance.....

I don't think sunseeker wants to know the max power his amps can generate but wants to know the max power that they ARE generating under normal use. For that he wants ballpark figure and so can estimate the R and use V from either a RMS Voltmeter or an oscilliscope. Its good enough to help determine wheter he can go low power SET.

Sunseeker-

The 95dB doesnt mean a whole lot without reference to the impedence of the speaker. If the impedence doesn't dip much below 8 ohms and is above 8 in the bass region then you should be able to go with a low-power (probably not flea power) amp. But lots of that depends on your listening preferences.

Sean

You want 85dB, your speakers are rated 95dB. That means you use 0.1 watts on average - typical music has a crest factor up to 20dB which is a factor of 100 - so a 10W amp will be more than sufficient to drive 85dB average.

By all means, try out the V^2/(guess)=power estimate. I say guess because speakers are not resistors.

I thought the AR-1's were 4 ohm with a series resistor or something like that. 8" midrange and tweeter along with 15" bass spkr.....? Now what you really need is a Klipschorn 😉

I have run my old Cerwin-Vegas with a walkman, although they sounded a bit compressed 😉

mike

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