Originally Posted by Sean Spamilton
FWIW, it's my understanding the AVR would set the correct distance and level regardless of whether he uses the LFE IN or one of the LINE IN's - as long as he's got the crossover on the sub all the way up. The AVR will set it's crossover point where it detects the lower end of his speakers range to be (or where the user subsequently sets it), and will only send the signal below the crossover point to the subs. (I realize crossovers are not a brick wall which is why one would have the crossover knob turned all the way up) In my case I have to use the LINE INs as using the LFE input disables the phase and crossover knobs - (and I need to adjust the phase in my particular situation).
I'm crossed over at 80 (on the AVR, the sub crossover is at max) using the LINE inputs, and there doesn't seem to be any ill-effects:
That's a great looking graph! Wonder how the waterfall / spectrograph looks like? Is this with the sub + the center channel only or left+right, left only or right only? Are you using multiple subs, room treatments and Audyssey XT32 to get that smooth response? How is the seat to seat variance like? Would have liked to see up to 300Hz to see at least an octave up above the crossover point. Based on your speaker specs and your graph, you can crossover from 50Hz up to 90Hz and have a smooth splice. Have you considered a low shelf filter with a rise of say 2 to 3dB per octave from say 100Hz down? Some like this based on the Fletcher-Munson loudness curves.
jnick1 has advised his sub being the LV12R. Using the LINE IN, the upper frequency is 100Hz.
As jnick1 is interested in a relatively high crossover (100Hz and up), he would be better off using the LFE IN (which he's confirmed in the following post). That's because using the LFE IN, the upper frequency is 300Hz. Refer to Rythimk's specs here: http://www.rythmikaudio.com/LV12R_specs.html
The quest for jnick1 (as well as for me) is to get a response similar to what you've got.
Marantz SR-7009, Oppo BPD-93, MTV 7000D, aTV, Harmony Home Control remote, KEF E301+T101, MiniDSP (2x4)+(10x10HD)+(DDRC-88A), Emotiva 2xXPA-5 (Gen2), Rythmik 2xF12G+2xF8, HiMedia Q16, LG 55EC9300.