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Car Audio Discussion
General Car Audio
couple kinda dumb questions
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<blockquote data-quote="jdawg90" data-source="post: 8410616" data-attributes="member: 583730"><p>I'm setting the gain and filters with a dmm. I always just used a 40hz sine wave at 0db, set the gain, did the ssf/lpf by eye and called it a day. However now I'm sending my subs over double their rms so I want to make sure everything is setup properly.</p><p></p><p>First I turned the filters off and gain all the way down. I played a 0db 40hz sin wave, and turned up the gain until my voltage was 50v (which was my target). I played various tones from 20hz to 70hz and the voltage is different on all of them. HU equalizer is flat loudness off. Is this normal?</p><p></p><p>Also when setting the ssf should I stop as soon as my voltage begins to change? I put on a 30hz tone which is where I want my SSF and adjusted it till the voltage dropped like 2v, then played a 25hz tone and I was only like 4v below where I am at 30hz. 5hz is 1.3rd an octabe and on a 24db slope I should be at -8db at 25hz vs 30hz which is def more than 4 volts. though I guess outputting a diffrent voltage at various frequencies is a factor, still something doesn't seem right.</p></blockquote><p></p>
[QUOTE="jdawg90, post: 8410616, member: 583730"] I'm setting the gain and filters with a dmm. I always just used a 40hz sine wave at 0db, set the gain, did the ssf/lpf by eye and called it a day. However now I'm sending my subs over double their rms so I want to make sure everything is setup properly. First I turned the filters off and gain all the way down. I played a 0db 40hz sin wave, and turned up the gain until my voltage was 50v (which was my target). I played various tones from 20hz to 70hz and the voltage is different on all of them. HU equalizer is flat loudness off. Is this normal? Also when setting the ssf should I stop as soon as my voltage begins to change? I put on a 30hz tone which is where I want my SSF and adjusted it till the voltage dropped like 2v, then played a 25hz tone and I was only like 4v below where I am at 30hz. 5hz is 1.3rd an octabe and on a 24db slope I should be at -8db at 25hz vs 30hz which is def more than 4 volts. though I guess outputting a diffrent voltage at various frequencies is a factor, still something doesn't seem right. [/QUOTE]
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