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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: 7471043" data-attributes="member: 635272"><p>Hi</p><p></p><p>1) I just tried a second HU and faceplate (same model) which I bought used off ebay. They didn't make a big difference to the bass response.</p><p></p><p>2) The ground wire coming from the head unit is currently connected to the negative battery terminal, from which another wire runs straight to the chassis. Thinking the problem could be caused by a poor ground I used a digital multimeter (DMM) to measure the resistance from the ground location to the negative battery terminal. To do this I disconnected the positive battery terminal, and connected the DMM (using a 4m wire to extend the range of one probe) in parallel with the ground location (the black ground wire coming out of the car wiring harness) and the negative terminal of the battery (black terminal). The resistance read 0.9 ohms. and the 4m wire had a resistance of 0.4 ohms so I concluded the ground was not the problem.</p><p></p><p>ie. ground location negative battery terminal</p><p></p><p>3) I also resealed the MDF baffles using two layers of foam on each side of the baffle. It cut down almost all of the speaker rattle but still no big difference to the bass. The RHS MDF baffle is pretty screwed (water has gotten into it, warping it a bit and causing it to split) so I will have to replace them both and waterproof them. Would one bad MDF baffle cause the overall bass output to drop significantly??</p><p></p><p>The bass only sounds better when I turn on the megabass of the unit and reduce the bass to +2/+3 (I normally run +5 2 100 and -1 10khz equaliser settings). But I don't like using the megabass as it ruins the fidelity of the sound.</p><p></p><p>In conclusion, either:</p><p></p><p>a) speakers are worn out (Alpine DLS-174A) after only 7.5 years of use</p><p></p><p>b) speakers are ok, current and replacement head units are worn out</p><p></p><p>c) speakers are ok, warped MDF baffle is causing the large drop in bass output</p><p></p><p>d) my ears have finally realised that the bass is lacking and I trying to blame the equipment //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p><p></p><p>Jon</p></blockquote><p></p>
[QUOTE="noms78, post: 7471043, member: 635272"] Hi 1) I just tried a second HU and faceplate (same model) which I bought used off ebay. They didn't make a big difference to the bass response. 2) The ground wire coming from the head unit is currently connected to the negative battery terminal, from which another wire runs straight to the chassis. Thinking the problem could be caused by a poor ground I used a digital multimeter (DMM) to measure the resistance from the ground location to the negative battery terminal. To do this I disconnected the positive battery terminal, and connected the DMM (using a 4m wire to extend the range of one probe) in parallel with the ground location (the black ground wire coming out of the car wiring harness) and the negative terminal of the battery (black terminal). The resistance read 0.9 ohms. and the 4m wire had a resistance of 0.4 ohms so I concluded the ground was not the problem. ie. ground location negative battery terminal 3) I also resealed the MDF baffles using two layers of foam on each side of the baffle. It cut down almost all of the speaker rattle but still no big difference to the bass. The RHS MDF baffle is pretty screwed (water has gotten into it, warping it a bit and causing it to split) so I will have to replace them both and waterproof them. Would one bad MDF baffle cause the overall bass output to drop significantly?? The bass only sounds better when I turn on the megabass of the unit and reduce the bass to +2/+3 (I normally run +5 2 100 and -1 10khz equaliser settings). But I don't like using the megabass as it ruins the fidelity of the sound. In conclusion, either: a) speakers are worn out (Alpine DLS-174A) after only 7.5 years of use b) speakers are ok, current and replacement head units are worn out c) speakers are ok, warped MDF baffle is causing the large drop in bass output d) my ears have finally realised that the bass is lacking and I trying to blame the equipment [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] Jon [/QUOTE]
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Is my head unit wearing out or is there another explanation?
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