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Soul Crushing Noise
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<blockquote data-quote="MCShaffer" data-source="post: 7666646" data-attributes="member: 640049"><p>I'm at the end of my rope, so I'm hoping someone can offer a suggestion. After my stock deck died in my '03 G35 sedan, I decided to make use of the pile of car stereo gear that I've had in my garage for a decade or two. Installation went smoothly, but when I started the process of level setting, an obvious issue presented itself.</p><p></p><p>Noise.</p><p></p><p>Specifically, it's the hissing noise you get from tweeters when you've got your levels set too high on an amplifier. Only I don't believe my levels are set incorrectly. Let me explain.</p><p></p><p>The only new piece of gear in the car is the Alpine CDE-102 head unit that replaced my dead stock deck. Next down the chain is an Alpine ERA-G320 EQ. The EQ used to be connected to a CDA-7873 via Ai-Net with absolutely no issues whatsoever. Because the new deck lacks Ai-Net, it's connected to the EQ with RCAs (the EQ also has RCA inputs). The front outputs of the EQ are connected to an Alpine MRV-T303 which is driving an a/d/s component set.</p><p></p><p>After setting the input level on the EQ (EQ volume turned all the way down, CD volume at 28/35) I'm getting a pretty bad hiss from the tweeters. The gains on the amp driving the component set are turned down to minimum (increasing them compounds the problem badly). Any reasonable volume increase produces a baseline hiss that's unacceptable.</p><p></p><p>So in summary, levels are matched between the head unit and EQ per the EQ's instructions. Gains are all the way down on the amp. Hiss is present.</p><p></p><p>I've swapped out RCAs. I've checked cable routing. I've checked ground of the EQ. Noise, noise, noise. Remove the EQ from the signal chain (connect head unit directly to amp) and the noise vanishes; It's definitely the EQ.</p><p></p><p>Any ideas? The one thing here that has me suspicious is the 2v output on the head unit. I've never used the RCA outputs on a deck with a 2v output voltage before, so I'm curious if that could be the culprit. I'm tempted to hunt down a 4v deck and put it in just to see if that remedies the problem. Other than that, I'm out of ideas.</p><p></p><p>Any help would be appreciated.</p><p></p><p>Thanks,</p><p></p><p>Chris</p></blockquote><p></p>
[QUOTE="MCShaffer, post: 7666646, member: 640049"] I'm at the end of my rope, so I'm hoping someone can offer a suggestion. After my stock deck died in my '03 G35 sedan, I decided to make use of the pile of car stereo gear that I've had in my garage for a decade or two. Installation went smoothly, but when I started the process of level setting, an obvious issue presented itself. Noise. Specifically, it's the hissing noise you get from tweeters when you've got your levels set too high on an amplifier. Only I don't believe my levels are set incorrectly. Let me explain. The only new piece of gear in the car is the Alpine CDE-102 head unit that replaced my dead stock deck. Next down the chain is an Alpine ERA-G320 EQ. The EQ used to be connected to a CDA-7873 via Ai-Net with absolutely no issues whatsoever. Because the new deck lacks Ai-Net, it's connected to the EQ with RCAs (the EQ also has RCA inputs). The front outputs of the EQ are connected to an Alpine MRV-T303 which is driving an a/d/s component set. After setting the input level on the EQ (EQ volume turned all the way down, CD volume at 28/35) I'm getting a pretty bad hiss from the tweeters. The gains on the amp driving the component set are turned down to minimum (increasing them compounds the problem badly). Any reasonable volume increase produces a baseline hiss that's unacceptable. So in summary, levels are matched between the head unit and EQ per the EQ's instructions. Gains are all the way down on the amp. Hiss is present. I've swapped out RCAs. I've checked cable routing. I've checked ground of the EQ. Noise, noise, noise. Remove the EQ from the signal chain (connect head unit directly to amp) and the noise vanishes; It's definitely the EQ. Any ideas? The one thing here that has me suspicious is the 2v output on the head unit. I've never used the RCA outputs on a deck with a 2v output voltage before, so I'm curious if that could be the culprit. I'm tempted to hunt down a 4v deck and put it in just to see if that remedies the problem. Other than that, I'm out of ideas. Any help would be appreciated. Thanks, Chris [/QUOTE]
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