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<blockquote data-quote="Darwin" data-source="post: 423041" data-attributes="member: 544843">what do you mean by what volume? you mean what volume do i set the head unit at to tweak gain? yeah, i guess 40 or 45. like i said i rarely listen at over 45, so that seems like a natural place to set it at in order to play with gain. note that this is 45 ON CD! the SLA reference is FM tuner, but thats weaker than cd... and someone on here said not to go over 50 on the volume dial if i was powering my interior speakers with the head unit, which i am. aux level is even weaker than FM, even with SLA maxed at +4. needless to say i&#039;m scared to go over 50, so i just dont listen to the radio much because its too quiet to blast.and as for the constant rumble thing.. it really depends on the song (as well as the input device: cd, radio, aux), which is why it&#039;s so hard to test. if distortion is that constant rumble, then throw on something like Miracle&#039;s &quot;Bounce&quot; or Daz Dillinger&#039;s &quot;My System&quot; and you&#039;ll get a rumble throughout the whole song. is that &quot;bad&quot; for the amp? also, even with conservatively mixed songs with sharp bass, there is no cutoff point for rumble vs. no rumble. if you set it so there is no rumble ever, you&#039;re going to have some horribly weak output. on the other hand, when i tweak with a song with sharp bass, i&#039;m tempted to set the gain so it will boom nicely, but then when i change songs it may rumble excessively.oh well. i guess there is no easy solution to this dilemma. =) i&#039;m going to try the sine-wave cd thing, mattj on these forums is selling them for $7 shipped i think. i like the idea of matching absolute numbers.</blockquote>

[QUOTE="Darwin, post: 423041, member: 544843"] what do you mean by what volume? you mean what volume do i set the head unit at to tweak gain? yeah, i guess 40 or 45. like i said i rarely listen at over 45, so that seems like a natural place to set it at in order to play with gain. note that this is 45 ON CD! the SLA reference is FM tuner, but thats weaker than cd... and someone on here said not to go over 50 on the volume dial if i was powering my interior speakers with the head unit, which i am. aux level is even weaker than FM, even with SLA maxed at +4. needless to say i'm scared to go over 50, so i just dont listen to the radio much because its too quiet to blast. and as for the constant rumble thing.. it really depends on the song (as well as the input device: cd, radio, aux), which is why it's so hard to test. if distortion is that constant rumble, then throw on something like Miracle's "Bounce" or Daz Dillinger's "My System" and you'll get a rumble throughout the whole song. is that "bad" for the amp? also, even with conservatively mixed songs with sharp bass, there is no cutoff point for rumble vs. no rumble. if you set it so there is no rumble ever, you're going to have some horribly weak output. on the other hand, when i tweak with a song with sharp bass, i'm tempted to set the gain so it will boom nicely, but then when i change songs it may rumble excessively. oh well. i guess there is no easy solution to this dilemma. =) i'm going to try the sine-wave cd thing, mattj on these forums is selling them for $7 shipped i think. i like the idea of matching absolute numbers. [/QUOTE]

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