Reply to thread

Message

<blockquote data-quote="eharri3" data-source="post: 5422148" data-attributes="member: 591579">Ive been through two Alpine head units, a 2 volt 9883 and a 4 volt 9886. I run an Alpine MRP-M500 and an Eclipse EA4200.With the first head when tuning the sub amp using a DMM the voltage wasn&#039;t right until the gain was set at just under .5 volts. The Eclipse gain dial ended up centered precisely at the 2 volt mark without me even looking at it. With the second unit the sub amp wasn&#039;t right until the gain was just over .5 volts but before 1.9, the half way mark. The Eclipse ocne again sounds perfect at or near the notch that matches the HU&#039;s output voltage.After doing some research Ive found some Alpines have weaker sub pre outs and probably with most mid or lower level head units they may not consistently put rated voltage or put out the same on the sub pre outs as they do on the front and rears. Goes to show, you can&#039;t really set gains based on that.Other than that I&#039;m not really worried about it. The sub sounds perfect and I don&#039;t see how getting more voltage at the head unit or some form of line driver would do anything for me if it doesn&#039;t change the loudness or performance of the sub. Sounds to me like you&#039;re whole setup is jacked up and you&#039;re not giving yourself all the volume you need to get full voltage on your sub outputs anyway because you&#039;re limiting your volume to compensate for a weak front stage.</blockquote>

[QUOTE="eharri3, post: 5422148, member: 591579"] Ive been through two Alpine head units, a 2 volt 9883 and a 4 volt 9886. I run an Alpine MRP-M500 and an Eclipse EA4200. With the first head when tuning the sub amp using a DMM the voltage wasn't right until the gain was set at just under .5 volts. The Eclipse gain dial ended up centered precisely at the 2 volt mark without me even looking at it. With the second unit the sub amp wasn't right until the gain was just over .5 volts but before 1.9, the half way mark. The Eclipse ocne again sounds perfect at or near the notch that matches the HU's output voltage. After doing some research Ive found some Alpines have weaker sub pre outs and probably with most mid or lower level head units they may not consistently put rated voltage or put out the same on the sub pre outs as they do on the front and rears. Goes to show, you can't really set gains based on that. Other than that I'm not really worried about it. The sub sounds perfect and I don't see how getting more voltage at the head unit or some form of line driver would do anything for me if it doesn't change the loudness or performance of the sub. Sounds to me like you're whole setup is jacked up and you're not giving yourself all the volume you need to get full voltage on your sub outputs anyway because you're limiting your volume to compensate for a weak front stage. [/QUOTE]

Verification