Reply to thread

Message

<blockquote data-quote="akheathen" data-source="post: 7445007" data-attributes="member: 629234"><p>well, lets not mix or confuse a direct correlation of watts of noise per watts of output.&nbsp; it&#039;s basically a correlation of how much power supply &quot;noise&quot; will reac, or be dampened vs. the signal that you are feeding it.&nbsp; lets take something common, like alternator whine.&nbsp; to make things simple, say we are running right off the alternator with no batteries, caps, or other dampening entities.&nbsp; now, alternators have an ac ripple because they are ac generators rectified to dc through diodes, and you end up with spikes.&nbsp; again, to make the numbers looks simple, and because it is close to typical, iirc, we will say that the ripple is +/- 35mv from the mean/average output you are seeing as a constant dc voltage.&nbsp; so what that means, is that the 12vdc is carrying a 70mvac signal with it.&nbsp; so where does that come into play and apply to your s/n ratio?&nbsp; what this means, is that that 70mvac signal is being picked up by your audio circuit somewhere between the inputs and the speaker terminal at a ratio of 70:1&nbsp; essentially, in this case, then you are playing 1mv of alternator whine/ripple, or &quot;noise&quot; to the speaker, regardless of the wattage being played, and you only hear it at real low volumes with your head next to it, typically.&nbsp; and, again, that is only if the noise is there.&nbsp; batteries, and such dampen the effect, and it does not include anything with the signal before the amp, such as something being picked up by the rcas, whether em field from power wires, or generated by ground traveling across the rca shield, or other noise that youp may be feeding into the rca jacks.&nbsp; now, if you have a better ratio, like say 105:1 on the same example setup, then you will only be playing .66mv at the speakers, instead of the 1mv @ 70:1........ hope this makes sense</p></blockquote><p></p>

[QUOTE="akheathen, post: 7445007, member: 629234"] well, lets not mix or confuse a direct correlation of watts of noise per watts of output. it's basically a correlation of how much power supply "noise" will reac, or be dampened vs. the signal that you are feeding it. lets take something common, like alternator whine. to make things simple, say we are running right off the alternator with no batteries, caps, or other dampening entities. now, alternators have an ac ripple because they are ac generators rectified to dc through diodes, and you end up with spikes. again, to make the numbers looks simple, and because it is close to typical, iirc, we will say that the ripple is +/- 35mv from the mean/average output you are seeing as a constant dc voltage. so what that means, is that the 12vdc is carrying a 70mvac signal with it. so where does that come into play and apply to your s/n ratio? what this means, is that that 70mvac signal is being picked up by your audio circuit somewhere between the inputs and the speaker terminal at a ratio of 70:1 essentially, in this case, then you are playing 1mv of alternator whine/ripple, or "noise" to the speaker, regardless of the wattage being played, and you only hear it at real low volumes with your head next to it, typically. and, again, that is only if the noise is there. batteries, and such dampen the effect, and it does not include anything with the signal before the amp, such as something being picked up by the rcas, whether em field from power wires, or generated by ground traveling across the rca shield, or other noise that youp may be feeding into the rca jacks. now, if you have a better ratio, like say 105:1 on the same example setup, then you will only be playing .66mv at the speakers, instead of the 1mv @ 70:1........ hope this makes sense [/QUOTE]

Verification