I am looking to upgrade my rear fill but am not sure if it is better to go with 2way or 3way speakers in the back with subs? Also the stock location calls for 6x9's but are round speakers better?
Thanks.

2 way or 3 way doesn't matter much when it comes to coaxs or 6x9's. It's more marketering. It's a deferent story when talking about component sets.

The trick is to go and have a listen to them and see which set sounds best to you in your price range. You won't get many decent reviews on the net for coaxs or 6x9's because, let's call them, serious enthusiats mostly use component sets (round) that are round and dedicate time to review them and test them.

Round dispearses the sound more evenly, but the most important part I would say is that in component sets, you get a seperate box called a crossover, the better the crossover the better the sound. Now when you see a coax or 6x9 2 or 3 way that doesnt have a seperate xover, that means it uses a cheep resistor to serve as the crossover.

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In my experience, given the same amount of power, 2ways have a punchier midbass than 3ways(coaxials), but the 6x9s slam the hardest. I am not sure what sound you are going after. If you want the rears to pound, then 6x9s. If you want rear fill for ambiance than 2way round speaker will do the trick. You may even consider just running a midbass only in the rear, so your sound stage will not be pulled back at all, as lower frequencies are more difficult to localize than highs.

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In my opinion unless you're running a surround sound 5.1 video system, rear fill is a waste. Spend that extra money on getting better front speakers. When you go to a concert you don't turn around to listen to the band.

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Two-way (car speaker)
Music can be reproduced with reasonable accuracy by two-way, or coaxial, designs. These speakers use a separate crossover and tweeter to deliver high frequency reproduction that surpasses that of single cone or dual-cone "extended range" models with whizzer cones. The tweeter, usually a cone or a dome, is mounted either on a post or bridge inside the front of the woofer cone. While our illustration shows a 6X9 oval speaker, the design is readily available in most oval and round sizes.



Three-way (car speaker)
Three-way or triaxial speakers take the separate woofer and tweeter from a two-way design and add a dedicated midrange driver for enhanced coverage of the vital middle frequency area. The filling effect of this extra mid-frequency energy can also boost overall uniformity.

I use the pioneer 4-way for rears, with overkill on the amps.
I keep it low in the rear to keep the soundsatge up front, but the rear full range fill in the missing stuff from the 2 ways up front.
And, when I want (or need) loud, I can put the fader back to normal and get very, very loud. Nice to be able to shut up them noisy people in the back seat.

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You don't want too many highs from the rear, 2-way preferably something without a hard dome tweeter, stick with the 6x9 for better midbass, 6.5 for better ambiance.

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Drive Safely.... Drive Sideways!

thanks for the input guys. I've got two sets of comps in the front right now (just recently installed) and so far I am happy with just the front stage. Like MC Ryan said the music should be coming from the front. I think I'm going to leave rear fill out for now unless their is compelling reason not to that I am not aware of.

I'd use the rear location for midbass if nothing else, throw a low pass filter in there and have a little more "snap" to the sound

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Drive Safely.... Drive Sideways!

completely a personal taste thing. I can't do without rear speakers as i find it unnatural. Most of the venues I go to have multiple speakers all around me and placed higher than my ears, in addition I'm rarely in the "sweet spot" in the centre. I think that for accurate real world sound reproduction, you should have multiple speakers placed above your head and surrounding you and you should sit off to one side(that part is easy in a car)...cause that's real world! Most important for me is; clarity, impact, and tonality...I'll leave sound stage and imaging for the truly sick!

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