The 2805 has preouts, how can I bi-amp my front speakers?
Will I hear significant sound improvement once the front speakers are bi-amped?
For me, it does, considering I am already using a powerful HK630. But it depends on what you mean by "significant", you might be expecting night & day, but it might not be the case if you are using a high model receiver already. But if you are using low level AVR's w/ pre outs, maybe, but that is subjective and will depend on what your guage of "improvement" means.
Bi-amping with 2 power amps is still best, but for receivers, simply connect the power amp like you would do normally. then remove the jumpers of your speakers, connect the
HF to the weaker amp, then the LF to the higher amp. BUT there is a risk that it wont sound good,
tsambahan ito actually. If it doesnt sound good, just use the power amps alone.
I would, in theory, recommend an all channels driven (ACD) AVR for bi-amping ,cuz :
1.) the power amp's rating is also all channels driven
2.) power ratings should not be too far away, and 2 channels driven amps usually measure in peak output (JEITA), not FTC output. How will you know where to put your LF or HF if the power ratings of the AVR & amp are measured differently? Look for your receiver's FTC power rating (xxw, 20hz-20khz, 0.0xTHD) ACD AVR's are always FTC rated.
3.) 2 channels driven amps that share their amps to 5-7 channels are erratic in their power rating, they can provide 120+w for stereo & dip to 40w or lower when they are dividing the power into 7 channels. Ergo, how can you decide where to place the HF & LF if the basic rule is to put the LF on the more powerful amp?
W/ ACD avr's, you can be sure that the power rating given by the amps are constant.
Just my thoughts.