Does anyone know or has anyone experimented with installing two sets of 6x9's and two sets of door speakers? I was just toying with the idea of buying some new speakers when thought maybe i can leave the stocko one's in there and mount the new one's next to the old one's. In theory would this improve the quality of my music or would it just crowd it up??

It would cause more hassles than it's worth. Just get new, more powerful speakers.

putting an extra pair of 6x9 will require you to cut the rear parcel shelf which is illegal, or putting it on a custom box, but due to the height it will likely blocking your rear view mirror which isn't safe either. not worthed i think.. :doubt:

Does anyone know or has anyone experimented with installing two sets of 6x9's and two sets of door speakers? I was just toying with the idea of buying some new speakers when thought maybe i can leave the stocko one's in there and mount the new one's next to the old one's. In theory would this improve the quality of my music or would it just crowd it up??

So u wanted to wire up 8 speakers? That would just be gay for the hu amp/amp that will be running the speakers. Better of getting better speakers. Not worth it!

Just remember a set of 6x9 at 8 ohms is ok for the head unit, 2 sets and the unit runs at 4 ohms, so you need a amp thats 4 ohms stable and wont run hot....

Just remember a set of 6x9 at 8 ohms is ok for the head unit, 2 sets and the unit runs at 4 ohms, so you need a amp thats 4 ohms stable and wont run hot....
Actually, car audio speakers and head units are almost always rated at 4 ohms. In fact you'd be hard pressed to find 8 ohm speakers for cars. And also if you add two speakers together it will depend on whether you wire them in series or parallel as to how it will affect the impedance seen by the head unit or amplifier. If you wire them in series then you will add their impedances and parallel will halve their impedance (so two 4ohm speakers in series would be seen as an 8ohm load, and two 4ohm speakers in parallel would be a 2ohm load).

And also if you add two speakers together it will depend on whether you wire them in series or parallel as to how it will affect the impedance seen by the head unit or amplifier. If you wire them in series then you will add their impedances and parallel will halve their impedance (so two 4ohm speakers in series would be seen as an 8ohm load, and two 4ohm speakers in parallel would be a 2ohm load).

I understand the impedance aspect of speaker wiring, but as far as the actual power reaching the speaker goes how would a parrallel hook up of two 4ohm speakers effect the actual RMS watts reaching both speakers? Is it affected at all or is it reduced?

After doing a bit of research, Ive found out for example: on the response 2x150 rms amplifier, it runs 150 rms per channel at 4 ohms. Where as it can run 230 rms a channel at 2 ohms. And 450 rms bridged both channels at 4ohms. Now heres my question:

If i was to hook up 2 x response 10 inch 250 rms subs (2 x 2 ohms voice coils, Im assuming simply adds together to total 4 ohms) , one per channel, so I'd be running both at 150 rms per channel as the impedance would be 4 ohms from the subs per channel.

Now compare that to hooking both subs up, but in a parrallel hook-up through (for hypothetical reasons only) just one channel, which means as the impedance of both subs is 4 ohms, that would mean that they would now have an impedance of 2 ohms, which means the channel would be running at 230 rms (single channel), my guess is that approx 115 rms would make it through to each sub (half total power of channel) hooked up in parrallel form on the one channel, there fore as stated in the first example, utilising all the channels and not just one with the 2 subs is more effective. Am I on the right track?

The impedance of each speaker will not change, they will always be 4 ohms (or 8 or 16 or whatever is stated on the back of the speaker), but the amp will see a load of either 2ohms (parallel) or 8ohms (series). So you would need to check your amp's specs to see how much power it puts out at the new impedance it is seeing. Say an amp is rated 100WRMS at 4ohms and 150WRMS at 2ohms and you have hooked up two 4ohms speakers in parallel - well the 150WRMS will be shared between the two speakers, ie. 75WRMS per channel.

Thanks dude, I edited my post but you still answered my question anyway. Cheers.

No problems mate - I'm sure if I missed out on anything the more edumacated electrical engineers here will pick it up.

No problems mate - I'm sure if I missed out on anything the more edumacated electrical engineers here will pick it up.
Ummm .. yeah.. ur on the money dude. (I'm no engineer, just a dirty old Electrician :doubt: )

As for 2 sets of 6x9s? Don't even bother.. chances are the stocko pair sounded SHIZEN, hence the upgrade, so imagine how they'd sound with 1/2 the power & a 2nd set doubling on frequencys.. DOUBLE SHIZEN! :confused:
Cut your losses, rack-off both pairs of 6x9s & throw in a 10" sub.. it's gonna sound 10x better in the end! :cool: