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Crackling sound in all loudspeakers even after replacing old ones
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<blockquote data-quote="Michkin" data-source="post: 8855044" data-attributes="member: 689584"><p>Today I had the chance to take a look at this issue and did the following:</p><p></p><p>1) Checked that the problem is also present with the engine off. I assume this discards an alternator-related reason for the problem.</p><p></p><p>2) Measure the voltage at both (battery and key) 12V wires at the HU using the original ground cable. Voltage is ok.</p><p></p><p>3) Run a new cable from ground pin at HU to clean ground on the frame. Problem persists.</p><p></p><p>4) Tried with a different radio. Problem persists.</p><p></p><p>5) I could not connect the speakers directly to the HU for a reason: the signal goes from the HU to a frequency filter, and from them separately to the tweeters and the 2-way speakers at the doors. I guess I could try connecting the 2-way speakers directly to the HU, I may try that again tomorrow, but somehow I don't expect any difference.</p><p></p><p>It is quite annoying when you buy an old car and have no idea of what has been done on it that could be the reason for a current problem. It being a car from 1995 has a pretty simple audio system, but I am puzzled.</p></blockquote><p></p>
[QUOTE="Michkin, post: 8855044, member: 689584"] Today I had the chance to take a look at this issue and did the following: 1) Checked that the problem is also present with the engine off. I assume this discards an alternator-related reason for the problem. 2) Measure the voltage at both (battery and key) 12V wires at the HU using the original ground cable. Voltage is ok. 3) Run a new cable from ground pin at HU to clean ground on the frame. Problem persists. 4) Tried with a different radio. Problem persists. 5) I could not connect the speakers directly to the HU for a reason: the signal goes from the HU to a frequency filter, and from them separately to the tweeters and the 2-way speakers at the doors. I guess I could try connecting the 2-way speakers directly to the HU, I may try that again tomorrow, but somehow I don't expect any difference. It is quite annoying when you buy an old car and have no idea of what has been done on it that could be the reason for a current problem. It being a car from 1995 has a pretty simple audio system, but I am puzzled. [/QUOTE]
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Crackling sound in all loudspeakers even after replacing old ones
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