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Wiring, Electrical & Installation
Tweeter hiss - source with scope?
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<blockquote data-quote="TheMonkey" data-source="post: 8671279" data-attributes="member: 676749"><p>RCA input to amp unplugged, car not running, tweeters have audible hiss. Amp-&gt;Xover-&gt;tweeter.</p><p></p><p>QUESTION: <strong>Can I see if it's the speaker wiring or power source by using my oscilliscope?</strong> Pretty good PC based scope I can sample up to 100k Hz and get very good look. Just not sure what to look for.</p><p></p><p>DETAILS:</p><p></p><p>Amp = Rockford Fosgate P300X2</p><p></p><p>Component speakers = Rockford Fosgate T1650S</p><p></p><p>Crossovers directly next to amp.</p><p></p><p>Gain on amp was set with a scope.</p><p></p><p>Tech support at Rockford Fosgate said either power supply or speaker wiring is routed by noise.</p><p></p><p>Power supply: 8awg direct to battery.</p><p></p><p>Speaker wires are 16awg.</p><p></p><p>Ground is big lug and star washer bolted to wire wheeled steel of truck body next to amp. Wire connections I feel very good about. Everything is soldered well except wire clamps in/out amps, crossovers, and power fuse junction, but they are all tight and proper.</p><p></p><p>I did my best to avoid running near anything that might cause EFI, but if I can figure whether speaker wire or power line, I can chase it down.</p><p></p><p>Thanks.</p></blockquote><p></p>
[QUOTE="TheMonkey, post: 8671279, member: 676749"] RCA input to amp unplugged, car not running, tweeters have audible hiss. Amp->Xover->tweeter. QUESTION: [B]Can I see if it's the speaker wiring or power source by using my oscilliscope?[/B] Pretty good PC based scope I can sample up to 100k Hz and get very good look. Just not sure what to look for. DETAILS: Amp = Rockford Fosgate P300X2 Component speakers = Rockford Fosgate T1650S Crossovers directly next to amp. Gain on amp was set with a scope. Tech support at Rockford Fosgate said either power supply or speaker wiring is routed by noise. Power supply: 8awg direct to battery. Speaker wires are 16awg. Ground is big lug and star washer bolted to wire wheeled steel of truck body next to amp. Wire connections I feel very good about. Everything is soldered well except wire clamps in/out amps, crossovers, and power fuse junction, but they are all tight and proper. I did my best to avoid running near anything that might cause EFI, but if I can figure whether speaker wire or power line, I can chase it down. Thanks. [/QUOTE]
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Tweeter hiss - source with scope?
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