Aftermarket head unit to 6 speakers?

[Geesie]

My Regal has the 6 speaker (two in the dash, two in the doors, two in the rear) setup. However, most aftermarket head units have four outputs, so right now only my dash and rear speakers work. How do I get the door speakers to work?

 

[86CLCruiser]

gm usuall has all their 6 speaker set-up rans with the fronts in series so you can run the normal 4 speaker output. You may have to either run wires into the doors, or try and catch the wires at the kick panels where they go into the door. depending on the quality of the radio, you could run them in paralel. But series would be preferable so you dont show the radio a 2ohm load and push it too hard

 

[Silent viewer]

take the front two channels and run one side positive to the positive on one speaker, then from the negative run it to the positive on the other speaker then run the negative to the second speaker negative. by doing this you will create a 8 ohm load running to the unit making it so it can work with out over loading your head unit. if you run 1 channel to 2 speakers doing pos to pos, neg to neg you are creating a 2 ohm load and you are going to over heat the head unit and likely blow the channels on the head unit.

 

[86CLCruiser]

take the front two channels and run one side positive to the positive on one speaker, then from the negative run it to the positive on the other speaker then run the negative to the second speaker negative. by doing this you will create a 8 ohm load running to the unit making it so it can work with out over loading your head unit. if you run 1 channel to 2 speakers doing pos to pos, neg to neg you are creating a 2 ohm load and you are going to over heat the head unit and likely blow the channels on the head unit.

totally agree thats the best way, but some newer head units are 2 ohm stable. Pioneers, kenwoods and alpines are maunfactured with a 2 ohm stable mosfet internal amp, but i'd still go the 8ohn route just for peice of mind

 

[Silent viewer]

if you can confirm that the head unit is in fact 2 ohms i would go that route, it will double the power to the speakers but it will also double the distortion....