Originally Posted by Howard Shure
Hey everyone. Quick question. I have the 2070 and I’m trying to figure out how to run my fronts (LSiM 707) full range while still sending everything 80hz and below to my sub as well. Do I run the front speakers as Large and then enable the extra bass setting? Trying to get a jump start in this while at work so I can go right into testing when I get home. I’ve searched for this but I didn’t find the exact answer. The other question is whether or not doing this is beneficial in a HT setup. The goal is to equalize the bass some since my sub is in the back of the room and I know my 707’s can handle it.
All that follows is IMHO. Others may disagree. Your mileage may vary. Whatever, take it with a grain of salt, but try my approach out.
Don't run Extra Bass -- it sucks. It complicates and takes away ability to manage the bass.
The whole "Large" and "Small" nomenclature about speaker capabilities is a farce, and should be discarded. It isn't whether they're big or small, limited or full-range, phat or dinky, whatever. It simply is the key to bass management in which you can tailor the range of low bass
that goes to the speaker and what is diverted to your subwoofer (which is a way, way, way better ultra-low bass speaker than 98% of main speakers). Aside from the brute capability of the woofers in the main speakers, there's a theory that when you do not require a speaker to suck power from the AVR to produce the low bass freqs, they can operate better, and the AVR has more reserve power where needed. By taking some of the ultra low bass (80 Hz up to, I dunno, 180 Hz) off the shoulders of those speakers is believed to make them more efficient
. So, essentially a win-win if you enable bass management even for "full-range" speakers and let some of that ultra low bass go to the subwoofer.
A limitation of the some AVRs is that you can only set a single bass crossover
point for all speakers, regardless of the size of the woofers in each pair of speakers. A great AVR lets you tailor it for each speaker (say if you have towers for left and right, mid-size for the center, and smaller bookshelf speakers for surrounds).
So even if your fronts are awesome towers with 8" to 10" woofers capable of sustained, smooth reliable bass down to 60 Hz, setting them "small" and enabling bass management doesn't "waste" their ability. Set the cross over to 80 Hz and let 'er rip.
Also consider: ULF bass below about 100 Hz (or is it 120 Hz? can't remember) can't be echolocated by most listeners. Whether it is produced by the Polks or the sub is kinda academic.
Also: just because a manufacturer states a speaker produces down to 20 Hz doesn't mean it does the 20-80 Hz range reliably and consistently. Subs are designed and tested to do just that. That range is where subwoofers eat breakfast; most other speakers just visit. Again, IMHO.