Ðề: B&W 683 Theatre + Denon 4310?
Em bổ sung thêm 1 chút về vụ bi-amp thì tăng công suất và bác lehoang vẫn đúng ( mặc dù em cũng đúng
) :
http://www.polkaudio.com/forums/showthread.php?t=49847
My Denon 3806 receiver has a similar function. If you are not going to use the Rear Surrounds (in other words, you are going to setup 5.1 as opposed to 7.1 system) then you can use those rear surrounds channels as part of the front channel amplification.
Instead of having 140 wpc to drive each of your front speakers, you would have a total of 280 wpc for the fronts, assuming your front speakers have bi-amp capability. However, each of these outputs would be at full frequency range. There is no crossover function provided in the receiver itself. You would be sending full range output to each of your speaker sections. Your tweeter's crossover would just block the low frequencies, just the same as it does if you don't bi-amp.
As Schwingding pointed out, some people only consider it to be "true" biamping if you have an active crossover at the pre-amp stage to split the frequency ranges before being sent to the speakers. Of course, the active crossover would have to be adjustable so that you could match to the speakers you were using.
The $64,000.00 question is -- will the type of bi-amping you can do with your receiver improve the sound? You will probably have to experiment and just see for yourself. Many fellow "Polksters" here have tried various forms of bi-amping and /or bi-wiring. Some have reported hearing an improvement. Some have not. It depends on alot of different factors.
One thing to be aware of. Most receiver manufacturers are, shall we say, "optomistic" in the way they report output wattage on a 5 or 7 channel receiver. They may report the FTC compliant wattage as something like "140 watts per channel continuous rms @ 8 ohms 2 channels driven with 0.08% THD". They seldom report the FTC wattage with all seven channels driven continuously. I'm not knocking receivers, I have one myself. But I am driving my front mains through a seperate amplifier using the "pre-outs". This takes some of the load off of the other 5 channels.
As far as the 6 ohm vs. 4 ohm question. If your receiver is not specifically rated for 4 ohms, then using it with 4 ohm speakers can cause problems, probably depends on how loud you like to listen. My Denon is rated at 8 ohms and 6 ohms. I think I read somewhere on Denon's website something to the effect "Can be used with 4 ohm speakers, but may cause the protection circuit to cut off the receiver if used for extended periods of time." In other words, the 4 ohm load is too much for the receiver and it is overheating.
I hope this helps. Welcome to the Polk Forum. There are a lot of wonderful people here. Some of the "old timers" have posted over 5,000 times and have been here for years. So it is kind of like an online family. There are often local gatherings called "Polkfests" where members get together in person and bring equipment for listening tests, etc.
Thế có nghĩa là nó sẽ ra đủ công suất là 140Wx2 tới cặp front, nhưng trong cặp front nó có mạch điện sẽ tách tần số ra cho nên công suất thật sự tới Treble,Mid,Bass sẽ thấp hơn 140W rất nhiều, tuy nhiên nó vẫn sẽ mạnh hơn không bi-amp 1 chút. 1 Chút cũng ok rồi nếu với B&W