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<blockquote data-quote="kyheng" data-source="post: 1113947" data-attributes="member: 13624"><p>As I said before, we cannot differentiate between 5hz unless using equipment to test it or your ear is very sensitive. If you only can get a HU with 2 pre-outs, is not a big problem after all, as 1 is meant for sub and 1 is for speakers. You really only need 3 is when you have 2 and 2 rear speakers and a sub, for better control of your fader on speakers.</p><p>You need a pre-amp or XO only when your HU have 1 pre-out.</p><p>Sorry to say is Pioneer, Kenwood or Sony(middle class HUs) cannot give you high pre-out V compare to Alpine and Eclipse, if not there's no money gap between them. Anyway it won't effect much on the amps. Only the signal from HU to amp might lost abit say supply 10hz, reach amp only have 6-7hz due to resistance on the RCA cable. Can you differentiate them? I cannot. Maybe Alpine is 7-8hz when reach amp. 1 thing for sure is how good a RCA cable is there are still have some resistance unless you are using a pure gold RCA cable.</p><p>To make your system simple, the best is HU, amps, speakers and sub. This can let you easy to troubleshoot for airplane sound. What for you need a pre-amp or XO where your Hu got 2 or 3 pre-outs? </p><p>If you manage to get 5750 that is the best setting for it.</p><p>Sony don't try to think of it, as the lense very fast spoiltand the problem start's to come out after warranty finished, Kenwood and JVC I used it before, not bad but don't know why people don't like it now. </p><p>Anyway I'm a middle end user, maybe will consider Alpine or Eclipse if got money to waste latter on.</p></blockquote><p></p>
[QUOTE="kyheng, post: 1113947, member: 13624"] As I said before, we cannot differentiate between 5hz unless using equipment to test it or your ear is very sensitive. If you only can get a HU with 2 pre-outs, is not a big problem after all, as 1 is meant for sub and 1 is for speakers. You really only need 3 is when you have 2 and 2 rear speakers and a sub, for better control of your fader on speakers. You need a pre-amp or XO only when your HU have 1 pre-out. Sorry to say is Pioneer, Kenwood or Sony(middle class HUs) cannot give you high pre-out V compare to Alpine and Eclipse, if not there's no money gap between them. Anyway it won't effect much on the amps. Only the signal from HU to amp might lost abit say supply 10hz, reach amp only have 6-7hz due to resistance on the RCA cable. Can you differentiate them? I cannot. Maybe Alpine is 7-8hz when reach amp. 1 thing for sure is how good a RCA cable is there are still have some resistance unless you are using a pure gold RCA cable. To make your system simple, the best is HU, amps, speakers and sub. This can let you easy to troubleshoot for airplane sound. What for you need a pre-amp or XO where your Hu got 2 or 3 pre-outs? If you manage to get 5750 that is the best setting for it. Sony don't try to think of it, as the lense very fast spoiltand the problem start's to come out after warranty finished, Kenwood and JVC I used it before, not bad but don't know why people don't like it now. Anyway I'm a middle end user, maybe will consider Alpine or Eclipse if got money to waste latter on. [/QUOTE]
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