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General Car Audio
Is my head unit wearing out or is there another explanation?
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<blockquote data-quote="noms78" data-source="post: 7456301" data-attributes="member: 635272"><p>Hi all</p><p></p><p>In recent months the sound in my system has changed for the worse. The bass level/fidelity seems to have dropped off and the treble seems harsher than before (easily fatigues my ears).</p><p></p><p>I've had the HU (Alpine 9825 cd player) since January 2004 so it is 7.5 years old!</p><p></p><p>I haven't changed anything in my system. Checked all wires - power/speaker/ground wires - all intact.</p><p></p><p>I even bought a digital multimeter to check the voltage across my battery and the amps going to the HU. Across the battery it measured 12.73V and upon starting my engine rose to 14.4V so this seems normal. When connecting the MM in line with the HU ( +wire to MM to HU ) the amps range from nearly exactly 1A to 2.X A when I turn up the bass/volume.</p><p></p><p>The HU is connected directly to the speakers and I am only running two front speakers (6.5" coax). The HU has a parametric EQ - Ive been using +5 2 100 (max is +7) the whole time as I think that sounds best given I'm not using a seperate amp. With these settings do you think the power amplifier component inside the HU would be near the end of its life thus explaining the change in sound?</p><p></p><p>The other thing I noticed was that very rarely, after disconnecting and reconnecting my HU to the power supply the "megabass" button on the faceplate doesn't work (its ok now) so maybe the faceplate could also be part of the problem.</p><p></p><p>I am thinking of buying another 9825 HU from ebay and see if that makes a difference.</p><p></p><p>Jon</p></blockquote><p></p>
[QUOTE="noms78, post: 7456301, member: 635272"] Hi all In recent months the sound in my system has changed for the worse. The bass level/fidelity seems to have dropped off and the treble seems harsher than before (easily fatigues my ears). I've had the HU (Alpine 9825 cd player) since January 2004 so it is 7.5 years old! I haven't changed anything in my system. Checked all wires - power/speaker/ground wires - all intact. I even bought a digital multimeter to check the voltage across my battery and the amps going to the HU. Across the battery it measured 12.73V and upon starting my engine rose to 14.4V so this seems normal. When connecting the MM in line with the HU ( +wire to MM to HU ) the amps range from nearly exactly 1A to 2.X A when I turn up the bass/volume. The HU is connected directly to the speakers and I am only running two front speakers (6.5" coax). The HU has a parametric EQ - Ive been using +5 2 100 (max is +7) the whole time as I think that sounds best given I'm not using a seperate amp. With these settings do you think the power amplifier component inside the HU would be near the end of its life thus explaining the change in sound? The other thing I noticed was that very rarely, after disconnecting and reconnecting my HU to the power supply the "megabass" button on the faceplate doesn't work (its ok now) so maybe the faceplate could also be part of the problem. I am thinking of buying another 9825 HU from ebay and see if that makes a difference. Jon [/QUOTE]
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Is my head unit wearing out or is there another explanation?
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