Reply to thread

Message

<blockquote data-quote="maylar" data-source="post: 1290153" data-attributes="member: 541144">Uhh.. no.An audio power amplifier takes the low voltage high impedance signal from the source (HU) and amplifies both voltage and current (power) to run a low impedance load (speaker). The gain control simply sets the amount of signal being fed into the amp&#039;s internal input stage.As Chris pointed out, most amps have internal power supplies that boost the 12vdc battery voltage up to whatever level is necessary for the desired output level. You mentioned 30V RMS on a DMM at the output, which is 42 volts peak. The internal power supply must provide at least +/- 42V DC to the output stage of the amplifier to get that.The exception is low power amps like HU speaker outputs. They use the battery power only, but they also use a &quot;bridge&quot; type amp circuit that doubles the amount of output voltage from the battery. With a 14.1 V supply a bridged amp can give about 50 watts peak into 4 ohms which is the rating of most HU&#039;s today.</blockquote>

[QUOTE="maylar, post: 1290153, member: 541144"] Uhh.. no. An audio power amplifier takes the low voltage high impedance signal from the source (HU) and amplifies both voltage and current (power) to run a low impedance load (speaker). The gain control simply sets the amount of signal being fed into the amp's internal input stage. As Chris pointed out, most amps have internal power supplies that boost the 12vdc battery voltage up to whatever level is necessary for the desired output level. You mentioned 30V RMS on a DMM at the output, which is 42 volts peak. The internal power supply must provide at least +/- 42V DC to the output stage of the amplifier to get that. The exception is low power amps like HU speaker outputs. They use the battery power only, but they also use a "bridge" type amp circuit that doubles the amount of output voltage from the battery. With a 14.1 V supply a bridged amp can give about 50 watts peak into 4 ohms which is the rating of most HU's today. [/QUOTE]

Verification