Originally Posted by fbov
What I can't understand is the response from many of the rest of us. The truth has been stated and explained, yet everyone ignores two key facts:
- RMS power doesn't exist, there's an RMS voltage at a load, but ...
- there are no purely resistive loads in audio drivers.
Thus, you are doing a comparative test - fairly and honestly - but one that has little relation to specifications or intended applications. I know why you've done it this way, it was feasible and reasonably controlable, critical for repeatable results. And you had the equipment and know-how to do it. I understand the value of doing what you can, rather than doing nothing because of what you can't.
My question is: Is a true test of audio amplifier performance possible?
Please note I'm asking for factual constraints, not dilettantes' opinions.
My initial thought is that you could use a common set of actual drivers with a common passage of material and use SPL as the output, hopefully tracking both electronic and speaker distortion to a pre-determined level while measuring voltage and current real-time. And as soon as I start on the next level of detail - how to do it - I'm back on your bench with resistive loads and a voltmeter.
I'm hoping that's due to my status as a novice
For the most part, if you read the whole thread, people
know what is going on, or they better since many issues
were hammered to death to ensure people know the skinny.
Re: RMS Power
It's 'consumer language' that people accept to easily
describe an amplifier test performed using the RMS test
methodologies; using sine waves and resistive loads.
What is easier to say? One long sentence or 'RMS power' ?
We know what is going on
Re: Why the RMS test method if it's not indicative of reality?
It can be. Play a single frequency sine wave 'test tone'
through your subwoofer and you now have a condition manifesting that is an 'RMS test', and since the frequency
is not changing, the load is not changing either, it can
be considered static like a resistor is.
Why give the amplifier a free pass to the beach where it
can sit drinking a margarita, soaking up the sun and
looking at the bikini hoes, that is a easy 'load', it's more
like a vacation.
I'd prefer to see what the amplifier can really do when the
times are tough, can it work in the mines 24/7 doing back
breaking slave labor ?It's your money
, do you want the amplifier
tested while on vacation or doing hard work ?