Volvo 670 Speakers:Technical Question

You will have to determine how they are wired, meaning are all 3 on the left or right channel in parallel or do they have a mix of parallel and series wiring to make a certain impedance (most car stereos are designed for 4 ohm impedance which can be achieved by either putting 2 8 ohm speakers in parallel, 1 4 ohm speaker, or many other combinations) . It may be easier, and would be a better install, to run your own home runs of speaker line to each speaker. If you do it that way, you can install your own crossover to put the highs and high-mids to the dash, low-mids and bass to the doors and full range to larger speakers in the bunk for a more balanced and controlled sound. After all, if you are going to upgrade might as well make the best of it without breaking the bank.

 

I upgraded my headunit in my Volvo VNM42 but kept the factory speakers for a long time, it made a hugh difference. When I did finally change the speakers I opted to leave the door speakers in place, put a speaker level crossover in place to cut the bass out of the dash, wired them to the front channel of the headunit then installed new runs into the doors where I mounted 6" JBL 3 ways with some insulation behind them and a custom wood resonator box, big difference in sound quality.

Sorry for the basic explanation of Ohm's Law, I thought you might be familiar with it, most people wouldn't even think about impedance when changing components, but hey now a few more people will have something to think about when they upgrade their stereo units. Good luck, anything you do will be better than OEM, just be sure to use the rear mounting screw to secure the headunit, first one I ever did in a big truck I didn't bother and it vibrated enough to tear the DIN mounting tray which eventually resulted in the headunit becoming loose in the dash, plus the cd player would skip often.