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Old 30th April 2005, 03:34 AM   #11
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Sad, sad, sad....

Today we have 600W ony 5.1 home theater in a box recievers that list power consumpition on the back of the unit as 390 VA.

Nice. Modern techology has outwitted the laws of thermodymanics.

I just bought and repaired (very minor) a Pioneer SX3800 that I think was advertized as 60 WPC that put out nearly 150WPC RMS @ 4ohms on my bench. (I only let it do this for a few seconds because I didn't want to have to find a pair of outputs somewhere) I also have a Kenwood KRC-750 that I recently saved. Another really nice sounding reciever with a unique tuner.
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Old 30th April 2005, 10:01 PM   #12
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Hi, myname159753

If the speakers that came with the amp are 6 Ohms, then one would assume an output impeadence of about 6 Ohms. If you put 8 Ohms in paralell, then you have 3.4 Ohms. This will draw too much current through the outputs and heat and exceed the SOA. Then you will be sending out smoke signals instead of music. If you put the 6 Ohm in series with the 8 Ohm, less current will flow and the limitation will be clipping. The amp will put out less power and will not have to work as hard, keeping the magic smoke within, BUT then the "dynamicness" of the impeadence (phase and magnitude versus frequency) of one speaker will affect the other and they probably aren't the same. This will change the sound of the music. Of course if you have a GOOD EQ, you could probably compensate.

Maybe you could get a couple more speakers and play around with series parallel circuits that have an overall impeadence of like 6 Ohms. Get out the calculator man!

Chris
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Old 30th April 2005, 10:15 PM   #13
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Cunningham,

A Class AB amplifier can easily produce 150W/channel RMS and peak power on toneburts (say 10:1 ratio - more indicative of musical demand) of 240Watts (a dynamic headroom of 2 dB) all from 300VA of transformer - representing efficient design without compromise, but be rated at what? The toroid rating of 300W or the likely power consumption before audible clipping sets in at maybe 60W.

So what rating best indicates to the unknowledgable consumer. How do you indicate in laymans terms that it's really a 480W amplifier but only uses 60W of power?
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