Pues la "Barbaridad" meramente la transmito:

Bi-amping the Denon AVR-3805 for 240 Watts/channel in the Fronts

What? A $1200 receiver that gives you 240 watts per channel to the main speakers in a bi-amped configuration while still allowing 5.1 surround? Absolutely. Read on... Using unused “Surround Back” amps to bi-amp the main speakers was mentioned by Gene DellaSala in his review of the Denon AVR-5803 receiver and the same procedure holds true for the AVR-3805. Why let those unused surround back amplifiers go to waste if you are not utilizing either them or Zone 2 speakers? Here is the procedure to successfully bi-amp the Denon AVR-3805 and deliver additional power to your main speakers:

Step #1: Connect a pair of analog RCA cables from the preamp outs of the "Front" channels to an unused input of the AVR-3805 (In my case, I chose the CD inputs).

Step #2: Select the chosen input as the source for Multi Zone 2.

Step #3: In the POWER AMP ASSIGN menu (5-1), select “Zone 2".

Step #4: Using the internal test tones of the AVR-5803, position the SPL meter (slow response, C-weighted) at the listening position and increase the master volume control until each speaker reads about 75dB.

Step #5: Disconnect the speaker level connections from the "Front" channels at the AVR-3805 and reconnect them to the appropriate "Multi Zone 2" speaker level connections.

Step #6: Repeat Step#4 while varying the "Multi Zone 2" volume level. I found nearly unity gain correlation between the "Front" channel and "Multi Zone 2" amplifiers to be at the "Multi Zone 2" volume level setting of +2dB. Coincidentlally, there is apparently a similar preamp gain structure between the AVR-5803 and the Denon AVR-3805 as they both reached near unity with the Zone 2 volume at this position.

Notes: It would have been nice if the channel trim for the Zone 2 level control had +/-0.5dB precision as did all of the other channel trims of this receiver. During this configuration I also wondered what would happen if the CD input were accidentally selected by mistake, causing the main channel preamp outputs to be suddenly routed to themselves (feedback). Not to worry, Zone 2 does not allow the same source to be sent simultaneously to the main speaker outputs so feedback is impossible – at least with regards to this configuration method.

Be sure to remove the jumpers on the back of the main speakers and then connect a set of wires from the "Front" channels of the receiver to the highs section of each of your front speakers and a set of wires from the "Multi Zone 2" channels of the receiver to the lows of your front speakers. Voila! You now paid only $1200 for a receiver that gives you 240 watts per channel to your main speakers where you need it the most.


Extraido de: http://www.audioholics.com/productre...5_review01.php