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<blockquote data-quote="phish368" data-source="post: 6336649" data-attributes="member: 570654">Like each person who post&#039;s on here, I tried the search but it did not provide me with an answer to the questions I have:So here we go.&nbsp; I set up my system last night using a DMM and test tones.Alpine CDA-9887 HU set to Defeat all, and volume turned up to 27 (3/4 of the way)1khz 0db test tone ran for front components and rear 6x9&#039;s50hz -10 test tone ran for sub (2 - 10&quot; eD subs)Amps:&nbsp; JL 300/4 amp for front and rearJL 250/1 amp for subNow on to the questions:1.&nbsp; I noticed that my JL 300/4 amp showed a different voltage for each channel i hooked the DMM up to.&nbsp; I was going for 4 ohms which is 17.3 on the DMM.&nbsp;&nbsp; Each channel showed me different voltages but they were very close.&nbsp; Is that a common thing?&nbsp; for example:&nbsp;&nbsp; I turned up the gain on one stereo pair and the left channel said 17.3 but the right channel said 17.8.&nbsp;&nbsp; The other stereo pair showed the left channel as 18.1 and 17.3.&nbsp;&nbsp; Granted the amp is old but I wanted to see if this was somewhat common2.&nbsp; After I set the gains i listed to some music in the car (duh).. I noticed that my rear deck sounded louder than my front components..&nbsp; To lower the rear deck, which should be done:a.&nbsp; lower the rear deck channels on the HU through the crossover db levels?b.&nbsp; lower the rear deck channels on the amp gain?3.&nbsp; After I set the gains i listed to some music in the car (duh).. I noticed that my sub&#039;s were not as loud as I&#039;d like.&nbsp; The sub level on the HU goes from 0 - 15.&nbsp; I placed the sub level at 8 when i was setting the gains with the DMM (thinking i&#039;d get some decent headroom) but when i listed to music I have to turn the sub level to 15 to get some volume.&nbsp;&nbsp; How do I go about setting the sub better?&nbsp;&nbsp; The gain knob is almost at its max (input level on amp is HIGH as the HU send&#039;s 4v).&nbsp; Should I switch the input level to low on the amp and try setting the gain again with the DMM?&nbsp; I assume 22.4V is the same whether the input level is set to high or low on the amp?&nbsp;&nbsp; Is it common to move the input level to &quot;low&quot; from &quot;high&quot; even if the HU states its a 4v pre-out?I know its alot of questions but any assistance would be greatly appreciated.</blockquote>

[QUOTE="phish368, post: 6336649, member: 570654"] Like each person who post's on here, I tried the search but it did not provide me with an answer to the questions I have: So here we go. I set up my system last night using a DMM and test tones. Alpine CDA-9887 HU set to Defeat all, and volume turned up to 27 (3/4 of the way) 1khz 0db test tone ran for front components and rear 6x9's 50hz -10 test tone ran for sub (2 - 10" eD subs) Amps: JL 300/4 amp for front and rear JL 250/1 amp for sub Now on to the questions: 1. I noticed that my JL 300/4 amp showed a different voltage for each channel i hooked the DMM up to. I was going for 4 ohms which is 17.3 on the DMM. Each channel showed me different voltages but they were very close. Is that a common thing? for example: I turned up the gain on one stereo pair and the left channel said 17.3 but the right channel said 17.8. The other stereo pair showed the left channel as 18.1 and 17.3. Granted the amp is old but I wanted to see if this was somewhat common 2. After I set the gains i listed to some music in the car (duh).. I noticed that my rear deck sounded louder than my front components.. To lower the rear deck, which should be done: a. lower the rear deck channels on the HU through the crossover db levels? b. lower the rear deck channels on the amp gain? 3. After I set the gains i listed to some music in the car (duh).. I noticed that my sub's were not as loud as I'd like. The sub level on the HU goes from 0 - 15. I placed the sub level at 8 when i was setting the gains with the DMM (thinking i'd get some decent headroom) but when i listed to music I have to turn the sub level to 15 to get some volume. How do I go about setting the sub better? The gain knob is almost at its max (input level on amp is HIGH as the HU send's 4v). Should I switch the input level to low on the amp and try setting the gain again with the DMM? I assume 22.4V is the same whether the input level is set to high or low on the amp? Is it common to move the input level to "low" from "high" even if the HU states its a 4v pre-out? I know its alot of questions but any assistance would be greatly appreciated. [/QUOTE]

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