there isnt any markings on the original subaru speakers, so how do i tell what wire is + and what wire is - ??. I dont have a meter the wires are red and blue they terminated into a plastic plug which connected to the original subaru speaker. anybody know what colour is + and which one is -

 

Guess that red is positive?

There is no easy way, as speaker negatives are no longer grounded to chassis - which they used to be on some factory fit stuff

The other way is take the head unit out, and with an ISO reference trace the wire back into the adaptor and through to original Subaru loom.

 

I have wired red as positive. as this was the clearist sounding when wired up.

well it has taken 4 hours but I have managed to dynamat and install 2 x 5" pioneers into the rear doors of a my03 wrx. I had cut spacer rings using 12mm mdf but I could not get the door card back on using these so i had to mutilate them down to about 8mm and fortunatly that still gave enough clearance for the speakers.

im chickening out on the fronts get pay someone to do it.

 

Fronts, believe it or not, are easier as they'll take 12mm

 

Simple...

Use a battery of considerable nads...like a small 9 volt from a toy or whatever...

Connect the speaker wires to this battery.Note the colors you touch to the poles.If the cone moves down,you're backwards.The cone should push up when polarity is good.

 

Cor, Steve, you're brilliant

(PS - bought a new sub - Diamond M6 12 D2. The Brahma was just too much with shipping...)

 

Brilliant?LOL!

Hardly...

Yeah,I figured the Brahma would end up costing too much.

 

When using a battery to prove speaker polarity, please make sure you only use a low voltage battery (i.e. 1.5 volt instead of 9 volt) You don't want to damage the speaker magnet

Phill

 

I've been using a 9 volt for many years without any burn-outs.Guess I should've been more specific...you only TOUCH the poles for a split second,not hook them up and leave them there.I use a small 9 volt because of the nifty wiring clip that just snaps on top of it and I added clips to the ends of it...clamp one on a speaker terminal and touch the other.My bad for not going into proper detail here.

And it won't hurt the magnet one darned bit.
It CAN melt the windings on the voice coil though if it is just hooked up and left there.Same as a light bulb.

A very good point though,and glad it was brought up...I should've been more specific with this.