sundownz
Pro Seller
Supporting Vendor
I know it is said a 100 times a day... "with impedance rise you are going to be over 1 ohm anyway" when talking about a half ohm load or lower on a daily system.
Sure... if you constantly played individual sine waves one at a time. But, is that what music is?
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http://www.audiograph.se/subpages/technical/whatmakesagoodamplifier.htm
"The upper graph illustrates the conventional way of measuring the loudspeaker impedance.
The lower graph illustrates the dynamical approach.
We took a commercial ’off-the shelf’ loudspeaker and did a standard impedance plot for it. We swept the frequency from 20 Hz to 20 kHz, measured the input voltage and current, and calculated the impedance.
However, instead of using a sine wave input signal, we used a square wave. The reason for this is that square waves consist of a large amount of sine waves, as does music. The square wave is of course not an equivalent of music, but for this test it was an easy way of showing that a complex signal (not just a simple sine wave signal) may make the load, from the amplifier point of view, very low.
If you study the graph resulting from the test, you will probably agree that not only is it necessary to check the amplifier’s behavior for resistive, capacitive and inductive loads – the amplifier should also be checked for loads with lower impedance than the nominal impedance of the loudspeaker.
This proves to be very important, since a loudspeaker with a nominal impedance of 4 ohms will sometimes have an actual impedance of 1 ohm or less. The PowerCube helps you perform testing of an amplifier, taking all these load attributes into consideration. "
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Keep that in mind when you want to run your amplifier at a super low impedance "daily"
Sure... if you constantly played individual sine waves one at a time. But, is that what music is?
---
http://www.audiograph.se/subpages/technical/whatmakesagoodamplifier.htm
"The upper graph illustrates the conventional way of measuring the loudspeaker impedance.
The lower graph illustrates the dynamical approach.
We took a commercial ’off-the shelf’ loudspeaker and did a standard impedance plot for it. We swept the frequency from 20 Hz to 20 kHz, measured the input voltage and current, and calculated the impedance.
However, instead of using a sine wave input signal, we used a square wave. The reason for this is that square waves consist of a large amount of sine waves, as does music. The square wave is of course not an equivalent of music, but for this test it was an easy way of showing that a complex signal (not just a simple sine wave signal) may make the load, from the amplifier point of view, very low.
If you study the graph resulting from the test, you will probably agree that not only is it necessary to check the amplifier’s behavior for resistive, capacitive and inductive loads – the amplifier should also be checked for loads with lower impedance than the nominal impedance of the loudspeaker.
This proves to be very important, since a loudspeaker with a nominal impedance of 4 ohms will sometimes have an actual impedance of 1 ohm or less. The PowerCube helps you perform testing of an amplifier, taking all these load attributes into consideration. "
-----
Keep that in mind when you want to run your amplifier at a super low impedance "daily"
