Stock Stereo/Headunit Frequency Crossover? Replacement Door Woofers

[PandaSPUR]

I might be completely mistaken here, but does the stock stereo have a pre-set crossover frequency thats hardwired somewhere?

As in the signals to the door woofer, for example, are cut off to be only a certain range of frequencies.

I want to upgrade just the door woofers on my BRZ since I'm overall pretty satisfied with the system. I'm just trying to figure out if it would make a difference or not.

Specifically looking at these three replacements right now:
[ame="http://www.amazon.com/dp/B002C8AFEE/"]Amazon.com : Infinity Reference 6032si 6.5-Inch, Shallow Mount High Performance 150-Watt Two-Way Loudspeaker (Pair) : Vehicle Speakers : Car Electronics[/ame]

[ame="http://www.amazon.com/dp/B003KN2TF8"]Amazon.com : JBL GTO638 6.5-Inch 3-Way Speakers (Pair) : Vehicle Speakers : Car Electronics[/ame]

[ame="http://www.amazon.com/dp/B00ANIECRQ"]Amazon.com: JBL GTO629 Premium 6.5-Inch Co-Axial Speaker - Set of 2: Car Electronics[/ame]

[Porcupint]

Door woofers are powered through the OEM amplifier. As far as I know, the head unit puts out a full signal to the amp and the amp does all the filtering if any.

For some reason your links aren't working for me. But you would probably need more power than the OEM amp provides to really get the most out of those speaker you're listing.

[PandaSPUR]

Originally Posted by Porcupint

Door woofers are powered through the OEM amplifier. As far as I know, the head unit puts out a full signal to the amp and the amp does all the filtering if any.

For some reason your links aren't working for me. But you would probably need more power than the OEM amp provides to really get the most out of those speaker you're listing.

Yea... the forums broke the link and I cant seem to fix it, an extra "/" got added into the URLs for some stupid reason.

Anyway, so does the stock amp do any filtering?

And the speakers I listed are 2ohm, 2ohm, and 3ohm impedance, so I thought they could still be run off of the stock amp since the stock door woofers are 2ohm. I've definitely seen a few posts around here about people using the Infinity's I linked. Will have to do more research on the JBLs.

[Chimera]

Stock amp does filter signal. idk what range exactly.

Originally Posted by PandaSPUR

Yea... the forums broke the link and I cant seem to fix it, an extra "/" got added into the URLs for some stupid reason.

Anyway, so does the stock amp do any filtering?

And the speakers I listed are 2ohm, 2ohm, and 3ohm impedance, so I thought they could still be run off of the stock amp since the stock door woofers are 2ohm. I've definitely seen a few posts around here about people using the Infinity's I linked. Will have to do more research on the JBLs.