Originally Posted by cocrh
No, they would not handle the mids the same. The 703 woofer has to reach down past 100Hz putting more strain on that driver. The 707 mid/woofer doesn't have that burden of moving air below 100Hz so will be less taxed. 707 is a 4 way design. The 703's woofer is the 707's mid/woofer.
Again you're looking at this if both speakers are being used full range, in home theater they are not. Adding a subwoofer and crossing them over at 100hz the 705/707 bass woofer will barely be contributing to the bass output. Those bass drivers are essentially being wasted so why spend so much more money for something that will be barely contributing to the bass output and NOT contributing to any mid-bass(0%) ?
Setting you crossover 100hz F3 on the 703 and the 707 the 6 1/2" will essentially be performing the same. The 707/705 6 1/2"driver internal 100hz crossover isn't a "hard cut off" either FYI.
The point is ALL the mid bass(100hz-500hz) is being handled by the 6 1/2" driver REGARDLESS of which Polk you look at 703/705/707.
Your looking at this from a 2.0 stereo setup point of view. I'm looking at this as a HOME THEATER setup with the subs crossed over at 80/100hz
again in a 2.0 stereo setup yes the 705/707 are amazing and i recommend them 100%
in a home theater application the 705/707 are a waste of money and anyone would be better off going with 703's and spending the extra money on a better sub.
Those massive bass woofers are contributing 0% to the mid-bass VS 99% of other towers the bass drivers are internally crossed over @ 250hz-500hz which means they are handling almost all the mid bass (there's a HUGE difference here)
the 705/707 act more like bookshelf with a build in sub crossed at 100hz then a standard tower that really adds to the mid-bass experience.
It's not that a 6 1/2" can't do mid bass but Dual 8" or any multiple driver setup will easily outperform a single 6 1/2" in mid-bass duties. The OP also has a large room which means he needs the extra mid-bass output.
*Note the OP will be using a rythmik FV25 which is an incredibly musical subwoofer with leaps and bounds more bass output than the 705/707 can produce from 10hz to 100hz, logically if the OP is acquiring such a premium subwoofer he will be crossing it over @ 80/100hz.