My sub box came with long cardboard cylinders for the ports do i need to keep those in??

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If i run a 4 sub set up would i need subs that are 2 ohm or 4 ohm to get a 1 ohm load?

The sub box should have come with instructions for trimming the port tubes to the right length, using information you can find in your subwoofers' owners' manual.

Channels bridged to a subwoofer?

If you don't use the correct port length, you won't really have a ported box. You'll just have a box with holes in it.

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What does the term ETR stand for in relation to car stereos?

yes don't take them out
I am sorry to tell you but you buy the speakers first and then you get the correct box for them,
most likely that box is not going to work

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Cd player cuts on and off?

Yes, you need to keep those tubes in, this is what tunes your ported box. Read the manual that came with your subs and find out the correct port length and trim them down to the correct length.

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Hello river rat?

Yes, there part of the port...ports or porting a sub-woofer enclosure is for tuning a box for a short frequency range. A good sub enclosure design program will give you exact dimensions for the port length and diameter. Ported sub enclosures are not the most accurate design, but take less wattage for the same db output of a sealed enclosure.

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Question about using a portable cd/mp3 player in a car?

nah replace them with some nice alloy or stainless steel one's of equel length. that will be more solid and provide better eye-candy if the lips rest on the front of the box.
click link below to see what im on about.

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