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<blockquote data-quote="thch" data-source="post: 5894118" data-attributes="member: 562032">so, digital recordings are essentially numbers.&nbsp;&nbsp; full scale refers to a test signal that spans all of these numbers.&nbsp; eg -- the loudest possible thing that could be recorded on a digital format*.and this is the main point -- to map &quot;maximum output&quot; with some actual signal.&nbsp; full scale refers to what the loudest recording maps to in terms of preout signal level.output impedance is a measure of an amplifier&#039;s ability to force a signal onto a line.&nbsp; it is more important when using multiple amplifiers, as at some point the HU&#039;s signal would start declining.often output impedance is increased to allow for better driving of the cable for technical reasons.&nbsp; but there is still a goal to keep this value low.the two listed specs are not the same.&nbsp; the first is saying the output impedance is 80 Ohm, while the second is saying that, if the HU drove and amplifier with a 20kOhm input impedance, the output would be 5.0V*.it is somewhat hard to say what differences, if any, you will see.&nbsp; the parts in the amplifier that are inefficient are not related to the voltage gain, but rather in harnessing/controlling large amounts of current precisely to move the speaker exactly as the input signal dictates.*the loudest &quot;smooth&quot; test signal that is.</blockquote>

[QUOTE="thch, post: 5894118, member: 562032"] so, digital recordings are essentially numbers. full scale refers to a test signal that spans all of these numbers. eg -- the loudest possible thing that could be recorded on a digital format*. and this is the main point -- to map "maximum output" with some actual signal. full scale refers to what the loudest recording maps to in terms of preout signal level. output impedance is a measure of an amplifier's ability to force a signal onto a line. it is more important when using multiple amplifiers, as at some point the HU's signal would start declining. often output impedance is increased to allow for better driving of the cable for technical reasons. but there is still a goal to keep this value low. the two listed specs are not the same. the first is saying the output impedance is 80 Ohm, while the second is saying that, if the HU drove and amplifier with a 20kOhm input impedance, the output would be 5.0V*. it is somewhat hard to say what differences, if any, you will see. the parts in the amplifier that are inefficient are not related to the voltage gain, but rather in harnessing/controlling large amounts of current precisely to move the speaker exactly as the input signal dictates. *the loudest "smooth" test signal that is. [/QUOTE]

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