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<blockquote data-quote="ingeo" data-source="post: 1887824" data-attributes="member: 567867">I installed a USA-600X amp and an IDQ12D2 recently and would like a little help understanding a few of the settings on the amp.The sub is in a very small sealed box 0.85^ft3.I&#039;ve done a bit of search and I haven&#039;t been able to dig up the answers I am looking for.1) The amp has a subsonic filter and I&#039;ve done a bit of reading and what I gather is this is more useful for a ported box.Should I have the subsonic filter On or Off?2) Because I have only delt with a small handful of amps and subs I really don&#039;t feel I have enough knowledge or experience to really know what is better.The amp has a sub freq knob that is configurable from 50Hz to 500Hz.&nbsp; I listen to Rock/Blues/Jazz.I am seeking your experience to know where I should have this knob set.&nbsp; I am guessing somewhere around the 80Hz range.But I do not know what frequences most Kick drums and bass guitars play at.3) I tried checking my gain using the JL tutorial and a <a href="http://www.ronelmm.com/tones/" target="_blank">50Hz test tone</a> and my voltage should be around 44.72.I disconnected the speakers and turned the sub control (on the deck) up to it&#039;s max and let the test tone repeat and I tried to measure the voltage.No matter which way I turned the gain knob the reading stayed around 69.xx.I am sure there are several possible things I was doing wrong here.I am not very familar with DMMs.&nbsp; The DMM I am using has two AC settings 200, or 500.I had it set at 200 because that was closest to the range I was testing for.Any input would be appericated.</blockquote>

[QUOTE="ingeo, post: 1887824, member: 567867"] I installed a USA-600X amp and an IDQ12D2 recently and would like a little help understanding a few of the settings on the amp. The sub is in a very small sealed box 0.85^ft3. I've done a bit of search and I haven't been able to dig up the answers I am looking for. 1) The amp has a subsonic filter and I've done a bit of reading and what I gather is this is more useful for a ported box. Should I have the subsonic filter On or Off? 2) Because I have only delt with a small handful of amps and subs I really don't feel I have enough knowledge or experience to really know what is better. The amp has a sub freq knob that is configurable from 50Hz to 500Hz. I listen to Rock/Blues/Jazz. I am seeking your experience to know where I should have this knob set. I am guessing somewhere around the 80Hz range. But I do not know what frequences most Kick drums and bass guitars play at. 3) I tried checking my gain using the JL tutorial and a [URL="http://www.ronelmm.com/tones/"]50Hz test tone[/URL] and my voltage should be around 44.72. I disconnected the speakers and turned the sub control (on the deck) up to it's max and let the test tone repeat and I tried to measure the voltage. No matter which way I turned the gain knob the reading stayed around 69.xx. I am sure there are several possible things I was doing wrong here. I am not very familar with DMMs. The DMM I am using has two AC settings 200, or 500. I had it set at 200 because that was closest to the range I was testing for. Any input would be appericated. [/QUOTE]

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