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<blockquote data-quote="Jepalan" data-source="post: 8359639" data-attributes="member: 655519">OK.&nbsp; Just talking about the 4 x 4 ohm speakers for now (ignoring the sub):Head-unit Left output ----&amp;gt; Amp channel 1 inputHead-unit Right output ----&amp;gt; Amp channel 2 inputAmp channel 1 (+) ----&amp;gt; Left Spkr 6x9 (+) ----&amp;gt; Left Spkr 5.25 (+)Amp channel 1 (-) ----&amp;gt; Left Spkr 6x9 (-) ----&amp;gt; Left Spkr 5.25 (-)Amp channel 2 (+) ----&amp;gt; Right Spkr 6x9 (+) ----&amp;gt; Right Spkr 5.25 (+)Amp channel 2 (-) ----&amp;gt; Right Spkr 6x9 (-) ----&amp;gt; Right Spkr 5.25 (-)If all your speakers are 4 ohm speakers, then each amp channel sees a total 2 ohm load.You only use one channel when doing the voltage calculations for setting gain with a DMMOne gain knob (input level) will set the gain for both channel 1 &amp;amp; channel 2For above connections you are restricted by the fact that one of the speakers is only 35 W RMS.&nbsp; Since each speaker will get half the power of the amp channel, you need to set the amp to around 70 W RMS.&nbsp; You might be able to push this a bit if you are careful with how loud you play.For 70W RMS,&nbsp; Vac RMS = SQRT(70 x 2) = 11.83 Vac RMSSet HU volume at 3/4 of max, use appropriate test tone and...Measure Vac on one amp channel output and set gain to hit 11.83 VacOr, just set by ear.&nbsp; Lots of info on setting gains here and elsewhere</blockquote>

[QUOTE="Jepalan, post: 8359639, member: 655519"] OK. Just talking about the 4 x 4 ohm speakers for now (ignoring the sub): Head-unit Left output ----> Amp channel 1 input Head-unit Right output ----> Amp channel 2 input Amp channel 1 (+) ----> Left Spkr 6x9 (+) ----> Left Spkr 5.25 (+) Amp channel 1 (-) ----> Left Spkr 6x9 (-) ----> Left Spkr 5.25 (-) Amp channel 2 (+) ----> Right Spkr 6x9 (+) ----> Right Spkr 5.25 (+) Amp channel 2 (-) ----> Right Spkr 6x9 (-) ----> Right Spkr 5.25 (-) If all your speakers are 4 ohm speakers, then each amp channel sees a total 2 ohm load. You only use one channel when doing the voltage calculations for setting gain with a DMM One gain knob (input level) will set the gain for both channel 1 & channel 2 For above connections you are restricted by the fact that one of the speakers is only 35 W RMS. Since each speaker will get half the power of the amp channel, you need to set the amp to around 70 W RMS. You might be able to push this a bit if you are careful with how loud you play. For 70W RMS, Vac RMS = SQRT(70 x 2) = 11.83 Vac RMS Set HU volume at 3/4 of max, use appropriate test tone and... Measure Vac on one amp channel output and set gain to hit 11.83 Vac Or, just set by ear. Lots of info on setting gains here and elsewhere [/QUOTE]

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