How do you install it for the subs and door speakers

go to crutchfield.com and look under their car audio installation page. From there you will have to input your vehicles year, make, and model. It should give you detailed instructions on how to properly install your speakers. You could always look that info up on the general web, but I find crutchfield to be a lot more informative.

Hi Ethan,

What you're looking for is called a "crossover". A crossover is an electronic filter for an audio or speaker circuit. In an audio circuit, a crossover is used to prevent or pass certain frequencies or a range of frequencies from passing through it. Since your sub will reproduce the bass or low frequencies, you don't want other speakers to reproduce them. A band pass filter on your door speakers will do this for you. A band pass filter passes only a range or "band" of frequencies and blocks those that are above and below the range or band of frequencies selected. Installing a band pass filter will prevent the very high & very low frequencies from getting to the door /dash speakers. Likewise, you should consider connecting a low pass filter to your subs, too. The low pass filters work a little differently from of the way band pass filters work - they only allow low frequencies to get to the sub - blocking all the other higher frequencies (your other speakers are better suited to reproduce those). Lastly, you would install a high pass filters on tweeters. Tweeters are designed to reproduce only the high frequencies - sending mid and low frequencies to them is wasting power and can cause damage to them.

You purchase the filters for specific crossover points (the block / unblocked point) as determined by the individual speakers. If a sub has a frequency response of 20Hz - 100Hz, a low pass filter of 100Hz would be ideal. Remaining filters would need to begin at 100Hz - assuming the mid-range speakers have a frequency response beginning at 100Hz. A band pass filter of 100Hz - 3KHz would fit the bill nicely if the mid-range speakers go up to 3Khz Match the high end of the band pass to the high end of the frequency response of the mid-range speakers. Next, a high pass filter at 3KHz would allow only the high frequencies to your tweeters. Basically, you want to have the entire audible range 20Hz - 20KHz covered by the speakers and have the crossover points that match the frequency response ranges of the speakers.

I hope this helps & good luck!

So you wanna run the subs off of the rear pre amp output rather than just the sub out correct? just get a splitter and run both the rear speakers and sub off of rear channel and front off of front channel. or run all four off of front and subs off rear output. this should give you the sound you want

you cna switch the working rca's to the sub out put to check for sound if u get sound it means your rca's are bad but if no sound then your other outputs in your radio may be deffective

Try installing any speaker's on the same wire that your tweeter is connected if it work's then your tweeter is burnt out

2000 Ford Expedition Car Radio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: White/Purple
Car Radio Accessory Switched 12v+ Wire: Black/Pink
Car Radio Ground Wire: Black/Green
Car Radio Illumination Wire: Blue/Black
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: Blue
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 6′ x 8′
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): White/Red
Left Front Speaker Negative Wire (-): Brown
Right Front Speaker Positive Wire (+): Green
Right Front Speaker Negative Wire (-): White/Orange
Car Audio Rear Speakers Size: 6′ x 8′
Car Audio Rear Speakers Location: Rear Doors
Left Rear Speaker Positive Wire (+): Light Blue/Black
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Purple/White
Right Rear Speaker Negative Wire (-): Light Blue

You will need a line level converter for starters (takes speaker level signal and converts it to line level/RCA signal) you connect this to the speaker left/right wires and it has a RCA left right on other end to connect and run to your amps, (you need this box because factory radios don't have RCA outputs on them) At that point all you have to do next is run the power/gnd/rem for your amp and then speaker wires to your front/rear speaker and then sub (if using). You can use one of these converters for your front/back speakers so you will still have use of your front/back/left/right fading options. make sure you disconnect th factory plug/harness at each speaker since the amp will be powering them and you will run speaker wires to each speaker. If you only want one converter it will be on your front channel and your sub will be power by the front. (you will fade to front for more/less sub bass unless your amp has a separate volume/bass control). If you want your sub to fade with rear speakers you will need to install another converter off of the rear speakers. Found a site with some photos that may help you with your project.
http://www.redlineforums.com/forums/howto-section/15003-how-sub-stereo-amp-install-factory.html

I ran into a similar problem installing a sustem in a Mazda RX8. He had BOSE speakers which operate at a different range. We had to purchase the Rockford 3sixty.

Yes, You can fit these in the Doors with Modification. Your best Sytem Would be 2 in Front, 2 in Rear, and Sub. If you REALLY Wanna get into it, Go to Crutchfield.com and Purchase the Pioneer 7800 Series Equalizer and 3 Amplifiers. AWESOME SOUND!!!!!!!!! Please Rate My Response! Thanks!

If I'm reading the amp manual right, you should be able to connect the amp in 3 channel mode. To do this:

• Connect both left door speakers in parallel to Ch A Left.
• Connect both right door speakers in parallel to Ch A Right.
• Bridge Ch B and connect it to the new 8" sub.
• Set the Ch A LPF/HPF to HPF.
• Set the Ch B LPF/HPF to LPF.

This should allow you to run all 4 door speakers and the sub from the amp. It will also automatically route non-bass to the door speakers and "only bass" to the sub.