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<blockquote data-quote="Vincer77" data-source="post: 8056774" data-attributes="member: 650763">Thank you for helping me understand this.&nbsp; This link explains it pretty well:<a href="http://www.bcae1.com/gaincon2.htm" target="_blank">Amplifier Gain Controls</a>So if I am understanding correctly, my sub amp channel&nbsp; gain knob is marked .25 v to 5V meaning that when set at 5V, a 5V signal will max the output of the amp.&nbsp; My HU RCAs are 0 to 4 V.&nbsp; Setting the HU to 75% of max is therefore 3V, so theoretically, the knob should be set at 3V, so that the 3V will deliver the full power of the amp.&nbsp; The amp gain will actually be G = 28.3/4= 7.1.Now, my front channel speakers that are rated for 70W rms.&nbsp; The front channel of my amp is rated for 125 W rms, so the gain should be set for 3 x 125/70 = 5.3V.&nbsp; Oops, it appears that even with the amp gain turned all the way down (.e. 5V), that I run the risk of overpowering those speakers.&nbsp; 5V setting will actually send 3/5*125 = 75W rms.&nbsp; But this is where impedance rise saves the day - right?It will be interesting to see where these actually end up.</blockquote>

[QUOTE="Vincer77, post: 8056774, member: 650763"] Thank you for helping me understand this. This link explains it pretty well: [URL="http://www.bcae1.com/gaincon2.htm"]Amplifier Gain Controls[/URL] So if I am understanding correctly, my sub amp channel gain knob is marked .25 v to 5V meaning that when set at 5V, a 5V signal will max the output of the amp. My HU RCAs are 0 to 4 V. Setting the HU to 75% of max is therefore 3V, so theoretically, the knob should be set at 3V, so that the 3V will deliver the full power of the amp. The amp gain will actually be G = 28.3/4= 7.1. Now, my front channel speakers that are rated for 70W rms. The front channel of my amp is rated for 125 W rms, so the gain should be set for 3 x 125/70 = 5.3V. Oops, it appears that even with the amp gain turned all the way down (.e. 5V), that I run the risk of overpowering those speakers. 5V setting will actually send 3/5*125 = 75W rms. But this is where impedance rise saves the day - right? It will be interesting to see where these actually end up. [/QUOTE]

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