If the head unit does not have a sub-out, you'll have to look into the
issue of a crossover. You do not want frequencies higher than a hundred
or two Hertz going to the subs.  You can get active or passive
crossovers. Active are usually a little nicer, and are inline at the
pre-amp outputs. Passive are wired between the sub and the amp, and are
cheaper. Radio shack will have both kinds if you're not into spending $$.

Brad

Brian Spisak wrote:

>It's very possible that the sub-amp will take either line level or speaker
>level inputs.  I suspect the RCA jacks are line level inputs while the
>terminals are speaker level.  There are two each because it takes both left
>and right channels and combines them (sub-woofers are generally considered
>non-directional).  You would use one or the other, but not both.  The line
>level option should give you better performance (lower noise/distortion).
>
>So, what to do?  If you have seperate outputs for a sub on your head unit,
>use those.  This will often be the case if the head unit has a seperate
>control for sub-volume.  Otherwise, if your head unit has both speaker and
>RCA outputs, and you are using just the speaker outputs, run the RCA to the
>sub.  If you have 4 speaker outputs, you can pick two of them (usually the
>rear) and run those to the sub.  If you also have speakers on the same
>outputs, you'll change the impedance by adding the sub, but most amps can
>handle that these days.
>
>Good luck.
>
>
>----- Original Message -----
>From: "Scott Wilson" <smorewhisky@YAHOO.COM>
>To: <vanagon@GERRY.VANAGON.COM>
>Sent: Friday, December 27, 2002 8:54 AM
>Subject: amp. hook up questions NVC
>
>
>
>
>>so im just wondering if anybody out there could tell
>>me exactly how to hook up an amplifier to my current
>>system to run some sub woofers...right now i've got a
>>disk changer in the cabinet under the sink, standard
>>deck runs it up front. the amp in question has the
>>power, ground, and then like 2 + & 2- terminals, plus
>>2 rca outlets. the power and ground seem easy enough,
>>im planning on putting in another fuse box run off the
>>aux. battery, and running the amp off that. although i
>>probobly need to run the deck off the aux. as well.
>>anybody have experiece the share with this? thanks
>>
>>=====
>>Scott Wilson
>>85 GL Westfalia
>>
>>__________________________________________________
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>>
>
>
>