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New system, sub smells
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<blockquote data-quote="20 hz bass machine" data-source="post: 8692250" data-attributes="member: 678131"><p>Wanted to update this post. I went back and set the gain again using a DD1. I knew the amp could over power my sub so I set the gain at volume level 60 (my max clean signal from my head unit is 61 so I play it safe at 60). I only turn my system to 48, 50 max so I figured it wouldn't be too much power at the lower playing volume and surely not clipping. That seemed to work great for the 30 minutes or so I was able to play it. Then after work I went back and did the math to see how many volts I wanted to see to get to a good wattage output. 50 volts puts me at 2500 watts which I think is safe. I went back with the DD1 to see the voltage I was putting out (while simultaneously detecting any distortion) at volume level 50 and, like it was meant to be, it was right at 50v. </p><p>Overall I've learned that using the amm1 in real time power mode is not a reliable way to set gain. Too much fluctuation in input voltage while bumping and too much change in ohm load with different frequencies. </p><p>Me and the wife went on a good hour long drive while bumping mostly decaf and bass boosted tracks with no problems at all. </p><p>Thanks for all the replies. If this ever comes up again hopefully someone will learn from this thread.</p><p>All in all if you have an amp that can overpower your sub, use an o scope or similar device to confirm you won't clip until well past your target output then do the math (square root of (target wattage x wired ohm load)) and set your gain to that voltage. Ex: target wattage is 2500. My sub is wired to 1 ohm 2500x1 is 2500. The square root of 2500 is 50 so I know I need to turn up the gain until I have an output of 50v. Later I might go up to 3000 in which case I will set the gain to roughly 55v. If done with an oscope or similar device while using a 0DB test tone, you will know for certain your not overpowering your system and not clipping.</p><p>I know that most everyone on this site knows how to set gains no matter the situation but this has been a learning experience for me and I wanted to share my realization for anyone who needs it</p></blockquote><p></p>
[QUOTE="20 hz bass machine, post: 8692250, member: 678131"] Wanted to update this post. I went back and set the gain again using a DD1. I knew the amp could over power my sub so I set the gain at volume level 60 (my max clean signal from my head unit is 61 so I play it safe at 60). I only turn my system to 48, 50 max so I figured it wouldn't be too much power at the lower playing volume and surely not clipping. That seemed to work great for the 30 minutes or so I was able to play it. Then after work I went back and did the math to see how many volts I wanted to see to get to a good wattage output. 50 volts puts me at 2500 watts which I think is safe. I went back with the DD1 to see the voltage I was putting out (while simultaneously detecting any distortion) at volume level 50 and, like it was meant to be, it was right at 50v. Overall I've learned that using the amm1 in real time power mode is not a reliable way to set gain. Too much fluctuation in input voltage while bumping and too much change in ohm load with different frequencies. Me and the wife went on a good hour long drive while bumping mostly decaf and bass boosted tracks with no problems at all. Thanks for all the replies. If this ever comes up again hopefully someone will learn from this thread. All in all if you have an amp that can overpower your sub, use an o scope or similar device to confirm you won't clip until well past your target output then do the math (square root of (target wattage x wired ohm load)) and set your gain to that voltage. Ex: target wattage is 2500. My sub is wired to 1 ohm 2500x1 is 2500. The square root of 2500 is 50 so I know I need to turn up the gain until I have an output of 50v. Later I might go up to 3000 in which case I will set the gain to roughly 55v. If done with an oscope or similar device while using a 0DB test tone, you will know for certain your not overpowering your system and not clipping. I know that most everyone on this site knows how to set gains no matter the situation but this has been a learning experience for me and I wanted to share my realization for anyone who needs it [/QUOTE]
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