Car Stereos: wiring a new stereo, jvc kd g210, chevy blazer

Question
I currently have a 2001 4 door chevy blazer. I had a jvc kd-g210 installed 6 years ago. It has now broken(wont eject-accept cd's) and I am replacing it. The problem is i never felt it was as loud as it should be. I have nice polk speakers and never seemed to utilize them. Talking to people it seems the installers must have wired the speakers to the old bose amplifier and not the new stereo with the higher wattage. If i buy a new stereo is there that much difference in difficulty to wire my speakers to the new system in order to utilize the higher wattage versus using the lower wattage bose amp? If not how do I go about doing this? Thanks.

Answer
Hi Andrew,

The output on a new deck will be very very very unlikely to be able to match the power of the factory amplifier.

All of those stereos out there that claim 4x50w are lying.  Numbers created by marketing sleazeballs to make their product look better than is mathematically possible.

Let's put it this way:  The power going to your deck is 12V with usually a 15A fuse.  This allows for 180w MAX power going into the deck.

Now, the deck needs some of that power to light up the display, spin a disc, power the USB if there is one, send out the pre-out signal, etc.  The 4x50 they're claiming is already impossible.

The point I'm making is the real, RMS power output of most decks is in the 15-18w per channel range.  The Bose factory amplifier is likely to have way more power.

I'd suggest one of two things has happened.  1: they already wired directly to the speakers, and you'll never get the full ability of your speakers without an amplifier, or, 2: the factory Bose system might expect a different impedance from what your speakers are and/or expects a different signal type, and the sound isn't making it as cleanly as possible.

So you have the option of a) Adding an amp to run your nicer speakers, which isn't overly difficult, but will take time to run new speaker wire, b) Just wiring this new stereo up like the old one, or, c) finding out what the last installer did, and changing it to see if it helps with your sound quality.

So to answer your question shortly: you'd have to run fresh speaker wire from the back of the deck, through the dash, into each of the doors, and into the speakers.  Certainly not difficult, just time consuming.

Justin