Bridging Rotel 1070 and Bi-amping Denon 3806

[Tenorichards]

While hooking up my Home Theater in a new room (dimensions approx 5mX7m), did some investigating on my (now outdated...darn those pesky new tantalizing BlueRay audio formats) Denon AVR 3806 receiver.

Found from this old link the 3806 is bi-ampable, so I figured I'd give it a try, just to fool around.
xxx.audioholics.com/reviews/receivers/denon-avr-3805/avr-3806-first-impressions"

Previously, the mains (Phonar p3s) are powered by a single Rotel 1070. Rather than letting the Rotel collect dust, thought "How would it function in bridged mono powering the Phonar Center Channel?"
xxx.phonar.de/englisch/veritas_p3_e.php]Veritas p3
xxx.phonar.de/englisch/veritas_c3_e.php]Veritas c3

Power 115 / 160 Watts
Efficiecy 91 dB (1 W/1m)
Frequency range 45 - 27.000 Hz
Crossover Frequency 2.300 Hz
Impedance 4 Ohms
Tweeter 29 mm
Deep-/Midrange 2x 130 mm
Dimensions: H x W x D 159 x 540 x 370(330)mm
Weight 13 kg
Construction 2 ways​

When researching the Rotel site saw something that caused a crimp in my dyslexic brain:
xxx.rotel.com/content/manuals/rb1070_multi.pdf

The two channels of the RB-1070 can be “bridged”. In this configuration the single channel produces a massive 330 watts! This feature allows you to increase the overall power output of your system by bridging the
RB-1070 and adding a second bridged RB-1070. Or the RB-1070 is bridged to drive a monophonic subwoofer. Note however that when the RB-1070 is bridged the speaker connected to it must have an impedance of 8 ohms or more.​

So, the obvious questions are:

1. Will it blow my center speaker because of the ohm and power difference?
2. Are there any advantages known to using the Denon 3806's capabilities to bi-amp the front mains?
3. Do I have too much time on my hands?

That is all. First Post. Be gentle.

 

[markw]

A bridged amp "sees" the load imposed by a speaker as one half of it's rated impedance. ie: it "sees" an 8 ohm speaker as 4 ohms and a 4 ohm speaker as 2 ohms.

Bridged amps do not like 2 ohm loads.

Do NOT use four ohm speakers with a bridged amp.

The manual is quite clear on this. You reprinted and bolded it. What don't you understand?

[edit] The speaker will be fine. It's the amp you should be worried about. It's not just the Rotel. This is true for ANY bridged amp. There may be n exception here and ther, as some pedantic ashhat will probably point out, but you can pretty much count on it being a universal truth.

 

[AcuDefTechGuy]

Answer: Yes, you have too much time on your hands.

Theoretically even passive bi-amping and bi-wiring helps. But in reality, you won't notice anything.

So, yeah, too much time on your hands.

 

[Tenorichards]

Do NOT use four ohm speakers with a bridged amp.

The manual is quite clear on this. You reprinted and bolded it. What don't you understand?

Its the dyslexia. Seriously. I thought I understood it, but had to make sure. Kinda like I have to have my wife POINT left when she says "Turn Left Here!!" All of a sudden, I began to wonder about what "8 ohms or more" meant. "Does more mean a lower number or a higher one."

Now I know for sure. Thanks.

(When I moved to Europe, I brought my Boston Acoustics sub with me. I gleefully found a power converter that switched power between 110/230, and gleefully plugged it in to the wall. Before plugging in the sub, I'm standing there, staring at two outlets on the converter, one for 110 and the other for 230, and remind myself I am now in Europe, therefore plug it in to the right damn plug! What do I do? I plug it in to the 230. Thus endeth that subwoofer. Dyslexia is a bee-otch.)