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<blockquote data-quote="eharri3" data-source="post: 5476774" data-attributes="member: 591579">I have a 9886. How did you set your gains? I tried mine at 4 volts to match the head unit output which works fine on my mid-high amp but&nbsp; with the sub amp it meant the 10 inch sub was barely even moving when the rest of the system was quite loud amd clear. Then I read a string of internet posts indicating these and certain other Alpine HUs have a history of making weak voltage at the sub outputs.I re-checked with a DMM and didn&#039;t get the desired voltage until the amp gain was set somewhere around 1-1.5 volts. The sub now hits hard and stays clean all the way to max undistorted volume. So I would guess the problem may be with weak sub outputs more than anything else. I just set my gain using a DMM and it sounds perfect so I didn&#039;t worry about it after that. Sub level is on 15, bass and trebble boost on zero on the amps and the head unit . Beyond that on the mid/high amp remember you have a 4&nbsp; volt head unit now, not 5, so the gains will probably have to go up a bit on that too but it shouldn&#039;t be as far off from matching the HU voltage as the sub is. At least mine isn&#039;t.I had these issues with both my 9886 and my 9883. The mid/high amp was fine when adjusted to match the head unit voltage but the sub amp&#039;s gain dial was usually at about 1/4th the head unit&#039;s rated output before I could get linnear output and volume from the sub.</blockquote>

[QUOTE="eharri3, post: 5476774, member: 591579"] I have a 9886. How did you set your gains? I tried mine at 4 volts to match the head unit output which works fine on my mid-high amp but with the sub amp it meant the 10 inch sub was barely even moving when the rest of the system was quite loud amd clear. Then I read a string of internet posts indicating these and certain other Alpine HUs have a history of making weak voltage at the sub outputs. I re-checked with a DMM and didn't get the desired voltage until the amp gain was set somewhere around 1-1.5 volts. The sub now hits hard and stays clean all the way to max undistorted volume. So I would guess the problem may be with weak sub outputs more than anything else. I just set my gain using a DMM and it sounds perfect so I didn't worry about it after that. Sub level is on 15, bass and trebble boost on zero on the amps and the head unit . Beyond that on the mid/high amp remember you have a 4 volt head unit now, not 5, so the gains will probably have to go up a bit on that too but it shouldn't be as far off from matching the HU voltage as the sub is. At least mine isn't. I had these issues with both my 9886 and my 9883. The mid/high amp was fine when adjusted to match the head unit voltage but the sub amp's gain dial was usually at about 1/4th the head unit's rated output before I could get linnear output and volume from the sub. [/QUOTE]

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