hey guys, i ordered a new head unit...its an alpine cda-9807. i was wondering if i would have to run a power wire straight to the battery for the mosfet internal amp, or would it even make a difference? heres a link for the specs... thanks
http://www.crutchfield.com/cgi-bin/S-xZIwMNhxQkt/ProdView.asp?a=&s=0&cc=01&g=62700&id=essential_info&i=500CDA9807
murph
Replies (4)
ttocs on 11/1/2003 15:36:33
there would be no audible difference if you went to the battery, or to the deck hrns. I would go to the hrns myself, but think about going to the chassis for ground.
accusedmonk on 11/1/2003 17:07:13
What is difference between the chassis ground and harness ground? I've been wondering that.
heart_beat on 11/1/2003 17:22:35
alright i was just making sure b/c i knew some headunits required a direct connection to the bat. well thanks for the help
murph
CrashMechanic on 11/1/2003 18:14:39
yeah, it doesn't make a difference where you get your power just as long as you have a constant 12v connection and an ACC connection. The reason for that is because you need to have constant power to your HU for memory purposes, and The ACC is so that when you turn the key to the off position you turn the HU off but don't lose power to the HU. ACC wires come from the ignition switch. And for the Chassis or harness ground question. A chassis ground means that you are connecting the ground wire directly to the frame of the car, and a harness grond means that you are connecting to a wire that will eventually somewhere along the line end up to be a chassis ground. Now, in normal or even low power systems it would not matter which one you ground to, because your not drawing that much amperage, so you don't need to worry about the resistence factor. If you have a high power system, You'll need to go to a chassis ground with a larger wire. The reason behind this is simple, in electrical theory the more area and less distance you have ona a wire the less resistence. The lower the resistence the cleaner the power, the cleaner the sound and also less heat generation. But people usally just do a chassis ground on all aftermarket stereo installations, which doesn't hurt.
http://www.crutchfield.com/cgi-bin/S-xZIwMNhxQkt/ProdView.asp?a=&s=0&cc=01&g=62700&id=essential_info&i=500CDA9807
murph
Replies (4)
ttocs on 11/1/2003 15:36:33
there would be no audible difference if you went to the battery, or to the deck hrns. I would go to the hrns myself, but think about going to the chassis for ground.
accusedmonk on 11/1/2003 17:07:13
What is difference between the chassis ground and harness ground? I've been wondering that.
heart_beat on 11/1/2003 17:22:35
alright i was just making sure b/c i knew some headunits required a direct connection to the bat. well thanks for the help
murph
CrashMechanic on 11/1/2003 18:14:39
yeah, it doesn't make a difference where you get your power just as long as you have a constant 12v connection and an ACC connection. The reason for that is because you need to have constant power to your HU for memory purposes, and The ACC is so that when you turn the key to the off position you turn the HU off but don't lose power to the HU. ACC wires come from the ignition switch. And for the Chassis or harness ground question. A chassis ground means that you are connecting the ground wire directly to the frame of the car, and a harness grond means that you are connecting to a wire that will eventually somewhere along the line end up to be a chassis ground. Now, in normal or even low power systems it would not matter which one you ground to, because your not drawing that much amperage, so you don't need to worry about the resistence factor. If you have a high power system, You'll need to go to a chassis ground with a larger wire. The reason behind this is simple, in electrical theory the more area and less distance you have ona a wire the less resistence. The lower the resistence the cleaner the power, the cleaner the sound and also less heat generation. But people usally just do a chassis ground on all aftermarket stereo installations, which doesn't hurt.
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