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Question on Setting amplifier gains
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<blockquote data-quote="BroncosNeverDie" data-source="post: 8792050" data-attributes="member: 675219"><p>Hello,</p><p></p><p>I have a question about setting gains. I have a 94 Bronco with an aftermarket 200A alternator. I have the 7" Denovo Audio Anarchy midbass woofers in the doors powered by a Alpine GM-D8604, Alpine hiend 28mm tweeters powered by another GM-D8604 and a 1Ohm 12" 750W Image Dynamics subwoofer in a ported box in the back powered by a 1200W Rockford Fosgate amp. A JL Audio Bluetooth receiver gets signals from my phone and feeds into a JL Audio TWK88.</p><p></p><p>Anyway, I tried resetting the gains this weekend because last time I did so I somewhat rushed it. But I am encountering odd problems, specifically clipping at very low levels. For the subwoofer, I set the "Bass Control" of the Fosgate amp all the way up, the volume knob of the TWK88 about 75% up and the phone volume 75%. I have done my due diligence and made sure my phone and the TWK88 do NOT clip at these levels, so the 0dB 40Hz tone is clean coming into the amplifier. But on the other side of the amp, with Gain set to lowest setting and all the other things (Bass boost) turned all the way down, I get clipping. Look at the waveform below. I was a bit baffled. The install is good, last time I checked there was a 0.2 Ohm drop between the rear ground connection and the battery negative terminal. I had to lower the volume to about 66% and the bass control knob of the fosgate to about 50% to get a clean waveform. Again, this is all at Gain 1. How is this possible? Should I be doing this with -5dB or -10dB test tones? Similar problems occured for the two Alpines. Clipping very early and I was using 0dB 1kHz, 4kHz and 8kHz tones. The sound is clean when I play music but it's several magnitudes quieter than before, when I set my gains quickly.</p><p></p><p>Any help appreciated!</p><p></p><p>EDIT: I just reread the Rockford Fosgate Prime 1200W amp manual and noticed that the "Bass Control" I have on my dash is this:</p><p></p><p><strong>REMOTE PUNCH LEVEL CONTROL</strong></p><p>When connected, the “Gain Control” is linked and allows you to remotely control the output level of the amplifier from the dash or center console.</p><p></p><p>So is this basically a remote gain control? If so then there's just two gain controls working against each other. How do I go about setting the actual gain knob on the amplifier itself?</p><p></p><p>BND</p></blockquote><p></p>
[QUOTE="BroncosNeverDie, post: 8792050, member: 675219"] Hello, I have a question about setting gains. I have a 94 Bronco with an aftermarket 200A alternator. I have the 7" Denovo Audio Anarchy midbass woofers in the doors powered by a Alpine GM-D8604, Alpine hiend 28mm tweeters powered by another GM-D8604 and a 1Ohm 12" 750W Image Dynamics subwoofer in a ported box in the back powered by a 1200W Rockford Fosgate amp. A JL Audio Bluetooth receiver gets signals from my phone and feeds into a JL Audio TWK88. Anyway, I tried resetting the gains this weekend because last time I did so I somewhat rushed it. But I am encountering odd problems, specifically clipping at very low levels. For the subwoofer, I set the "Bass Control" of the Fosgate amp all the way up, the volume knob of the TWK88 about 75% up and the phone volume 75%. I have done my due diligence and made sure my phone and the TWK88 do NOT clip at these levels, so the 0dB 40Hz tone is clean coming into the amplifier. But on the other side of the amp, with Gain set to lowest setting and all the other things (Bass boost) turned all the way down, I get clipping. Look at the waveform below. I was a bit baffled. The install is good, last time I checked there was a 0.2 Ohm drop between the rear ground connection and the battery negative terminal. I had to lower the volume to about 66% and the bass control knob of the fosgate to about 50% to get a clean waveform. Again, this is all at Gain 1. How is this possible? Should I be doing this with -5dB or -10dB test tones? Similar problems occured for the two Alpines. Clipping very early and I was using 0dB 1kHz, 4kHz and 8kHz tones. The sound is clean when I play music but it's several magnitudes quieter than before, when I set my gains quickly. Any help appreciated! EDIT: I just reread the Rockford Fosgate Prime 1200W amp manual and noticed that the "Bass Control" I have on my dash is this: [B]REMOTE PUNCH LEVEL CONTROL[/B] When connected, the “Gain Control” is linked and allows you to remotely control the output level of the amplifier from the dash or center console. So is this basically a remote gain control? If so then there's just two gain controls working against each other. How do I go about setting the actual gain knob on the amplifier itself? BND [/QUOTE]
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