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<blockquote data-quote="mbacis" data-source="post: 490029" data-attributes="member: 555818">Ok, I have an AIWA CDC-X504MP HU.&nbsp; It only has one set of pre-outs and I have the option to designate the output as either &#039;rear&#039; or &#039;sub&#039;.&nbsp; If I choose sub I have level control from the HU and optional built-in LPF.&nbsp; As I understand it, if I choose &#039;rear&#039; then I can have fade control over the output.My issue is this....I want to hook up a 4-channel amp powering the front speakers with two channels and bridging the other two to power a sub.&nbsp; What is the best way to hook this up?If I power the rears with the HU and use the pre-out on &#039;sub&#039; setting with the LPF turned off I will be able to adjust the fronts and the sub at the same time with the HU&#039;s &#039;sub&#039; level control and I&#039;ll have to go to the amp to make changes to either the sub or fronts seperately.&nbsp; In this case do I keep the HU&#039;s fade all the way to rear since nothing will be hooked up to the front?The other option is to use the pre-out in its &#039;rear&#039; setting and be able to adjust both the sub and fronts at the same time with the fade control.&nbsp; However, do I need to then wire my rear speakers as fronts and use the fade control in reverse (front=rear speakers, rear=sub+fronts)?Or...finally, should I just use the pre-out (in &#039;sub&#039; mode) for the rear channels on the amp, bridged to the sub, and then use speaker level inputs for the front channels so that I maintain accurate fade control and have sub level control from the HU?Sorry for all the questions, this will be my first self-installed amp.&nbsp; And no, I haven&#039;t bought any of it yet.&nbsp; I&#039;m thinking Infinity Kappa 652.5i in the front and then just a single Image Dynamics 8&quot; in a sealed truck box.&nbsp; Not looking for anything spectacular, just want my wife&#039;s &#039;99 Saturn SL to sound acceptable since I&#039;ve found myself as the primary driver since we bought a new car.&nbsp; Thanks in advance for any suggestions.</blockquote>

[QUOTE="mbacis, post: 490029, member: 555818"] Ok, I have an AIWA CDC-X504MP HU. It only has one set of pre-outs and I have the option to designate the output as either 'rear' or 'sub'. If I choose sub I have level control from the HU and optional built-in LPF. As I understand it, if I choose 'rear' then I can have fade control over the output. My issue is this.... I want to hook up a 4-channel amp powering the front speakers with two channels and bridging the other two to power a sub. What is the best way to hook this up? If I power the rears with the HU and use the pre-out on 'sub' setting with the LPF turned off I will be able to adjust the fronts and the sub at the same time with the HU's 'sub' level control and I'll have to go to the amp to make changes to either the sub or fronts seperately. In this case do I keep the HU's fade all the way to rear since nothing will be hooked up to the front? The other option is to use the pre-out in its 'rear' setting and be able to adjust both the sub and fronts at the same time with the fade control. However, do I need to then wire my rear speakers as fronts and use the fade control in reverse (front=rear speakers, rear=sub+fronts)? Or...finally, should I just use the pre-out (in 'sub' mode) for the rear channels on the amp, bridged to the sub, and then use speaker level inputs for the front channels so that I maintain accurate fade control and have sub level control from the HU? Sorry for all the questions, this will be my first self-installed amp. And no, I haven't bought any of it yet. I'm thinking Infinity Kappa 652.5i in the front and then just a single Image Dynamics 8" in a sealed truck box. Not looking for anything spectacular, just want my wife's '99 Saturn SL to sound acceptable since I've found myself as the primary driver since we bought a new car. Thanks in advance for any suggestions. [/QUOTE]

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