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Old 24th March 2004, 04:51 PM   #11
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ok so power the back with the head unit..

*QUESTION*:what is the best way to wire them up so I get the full wattage of the head unit to the speakers? I'm assuming it doesn't dynamically dole out wattage depending on which speakers are attached..should I hook it up like this:

From Speaker: -BL wire to -BL and -FL on head unit
-BR wire to -BR and -FR on head unit

same for +BL and +BR

and power the fronts with the amp..I'll just set these up in a "standard" 2 ch amp configuration and keep the amp level down.

?????????????????????????????????????????????????? ?

I think thats about the only question left...Once I know how to do that I think i'm good.
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Old 24th March 2004, 05:13 PM   #12
jp88 is offline jp88  United States
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no the amp section in most (99.99%) of head units is not bridgeable however if you only hook up two speakers (to the rear outputs in your case) it will put out a little more power than o those two than it would to 4 because the rail voltages stay alittle higher in the amp section with less load.. you share one power supply in the amp for all four chanels...........
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Old 24th March 2004, 07:16 PM   #13
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Default okie dokie

ah ha so my head unit is dynamic to a small degree with it's little amp..i'm just worried that it won't push out enough since it will have the drive the bass as well. Actually i suppose it really won't need to since the 6x9's in the front will supply bass as well and the back speakers will just kind of complement the fronts...so i'll leave the amp set to full in this case...

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Old 26th March 2004, 02:06 AM   #14
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Default paint a picture for me now...

ok so i found out my amp is 70w rms per channel. but i noticed there are 2 inputs on it..one is dual RCA and it says "low" and another is a plastic block with 4 pins and says "high". there is also a switch on the amp that has the options high/full/low...my brother in law said when he hooked it up using the rca "low" input it still played the mids and highs as well..if anyone knows what i'm talking about please ease my fears..i want the amp to push all frequencies to the front speakers and LOUD...then of course all freq's to the back but not as loud just to complement the front...

lead the way capitan
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Old 26th March 2004, 02:18 AM   #15
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both inputs on the amp are the same, just that one has an internal voltage divider so you can use the speaker output on the headunit to get an audio signal into the amp.

so, the filters will have the same effect on both inputs..

if you do parallel the speakers, they will all be just as loud as each other... but this shouldn't be a problem as the rears are further from you than the fronts, and should therefore sound slightly quieter
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Old 26th March 2004, 03:00 AM   #16
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Default sitting on the fence...

so now i'm torn again between running all 4 speakers off the amp or the 2 front off the amp and the 2 back off the HU. If I run all 4 off the amp then i'll effectively be getting about 18w/channel correct?...i'm still worried about how to get the 6x9's where the 5x7s went..i suppose i'll figure that out once i get the door panels off :P..
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Old 26th March 2004, 06:05 PM   #17
maylar is offline maylar  United States
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What amp is it (make and model)?
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Old 26th March 2004, 07:01 PM   #18
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Default poop

its a crappy amp...it puts out 70w/channel rms. my only real concern anymore is getting the 6x9's in the front door panel
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Old 26th March 2004, 10:00 PM   #19
maylar is offline maylar  United States
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"Crappy" amps typically don't do well with 2 ohm loads. You'd likely be best off amping the fronts only.

And if you don't already have speakers, squeezing 6-1/2" rounds in the doors will get you better sound quality than ovals. It also opens the door to more serious upgrades in the future.
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Old 27th March 2004, 05:05 PM   #20
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Default yup yup

yeah i'm going to just amp the front 2...and i know that round speakers are sonically superior but I wanted to try with what i've got first..if not then I'll buy some good 6.5" speakers for the front, amp them..and run the back 6x9's off the HU just for rear backfill...

thanks
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