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What the hell is BIwire mode, Mb Quart?

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Old Oct 15, 2004
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What the hell is BIwire mode, Mb Quart?

Hmmm, I looking at my MB Quart QM 218.61 Q series. There is an option to biwire the xovers. Don't confuse what I am saying with BiAmping, I understand that. But what the hell is biWiring. It says for biWire, I should connect the + of the input low and the + of the input high together. Then connect the - of the input low and the - of the input high together and run the connections into one channel. How is that different from running the channel into the input low straight up, the way standard wiring is done?
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Old Oct 15, 2004
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Biwiring and Biamping are more or less the same thing (in terms of how wires are run), but with biwiring you use one 2-channel amp and biamping you use a 4-channel amp.

So basically you have one channel and you run two wires to the crossover from both the positive and the negative, and then you do the same thing with the 2nd channel. The crossover then divides the frequencies to the different speakers. Since you are connecting 2 speakers off of one channel (tweeter and mid), you would expect to get a lower impedence load...But, this is not the case when you use the quart crossovers. The quart crossover keeps the speakers from overlapping and causing a lower impedence to be seen by your amp.

Biwiring is kinda hard to explain because it makes no sense to me why any one would biwire, as opposed to biamping or the traditional wiring schematic. It is a waste of wire, and does not allow for the customization that biamping would.



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Old Oct 15, 2004
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Originally Posted by fonto
Biwiring is kinda hard to explain because it makes no sense to me why any one would biwire, as opposed to biamping or the traditional wiring schematic. It is a waste of wire, and does not allow for the customization that biamping would.
Yeah, I understood how to biwire and what it did and how the quart xovers prevented the impedence drop. I guess what I was asking was what you said last, WHY THE HELL is it there? Its almost like, if you wanna do something much more complicated, open the xovers and use more wire, then try this - it does nothing that tradition wiring doesn't do. Friggin germans and thier wiring diagrams, options and instructions.

BTW, where is the girl shaking her ***? I miss it already.
Oh wierd, its back now. Before when I read your post, the image wasn't there.
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Old Oct 15, 2004
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On the quart xover (at least my PSD's) it says BiWire but it is really referring to biamping.
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Old Oct 15, 2004
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There was a discussion about this on another forum I visit occasionally:

http://www.di.fm/forums/showthread.p...threadid=65957

Here's a qoute from the thread:

Bi-Wiring is when you run two pairs of wires (parallelled) off of one pair of speaker outs (one channel), and connect each pair to one side of the crossover.

The improvement in sound is due to avoiding carrying widely varying frequencies in one wire. the amount of improvement is related to the electrical properties of the crossover, and each individual driver, and even the amplifier. not to mention that of the speaker wire itself (capacitance, incuctance, etc).
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Old Oct 16, 2004
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lets say you have two really nice 2 channel amps...you could run one two channel for you tweets and one two channel for your mids to get the most power to them at 4 ohms...

as impedance goes down so does the dampning factor of the speaker...basically if you can get 100 watts to each speaker at 4 ohms....it will "sound better" than 100 watts to each speaker at 2 ohms.
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Old Oct 16, 2004
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Originally Posted by alex053
lets say you have two really nice 2 channel amps...you could run one two channel for you tweets and one two channel for your mids to get the most power to them at 4 ohms...

as impedance goes down so does the dampning factor of the speaker...basically if you can get 100 watts to each speaker at 4 ohms....it will "sound better" than 100 watts to each speaker at 2 ohms.
I guess You didn't see the part of my post that said "Don't confuse what I am saying with BiAmping" silly! I know what biAmping is, I plan to go that route again actually. What I am talking about is BiWiring, a term that MB quart uses to describe exactly what Brash says above. Brash offered a pretty good explanaition for it, but I'm still thinking its a negligable difference. Thanks for trying though Alex, you ever heard anything about biwiring though?

Thanks for the good word Brash, anyone got any info on this, Lud, Rabbit, anyone?
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Old Oct 16, 2004
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well then bi wiring would require an external crossover also so that both wires are carrying different frequencies and you could then just go to the speaker with with the wire. you wouldnt need the external crossover at that point because each wire is already carrying the signal that you want the speaker to recieve. seems like you could just avoid any power loss, harmonics, and phase shifts by not using the crossover at all and bi wiring...i honestly think bi wiring and bi amping may be interchangeable terms

usually you only hear that team "bi wiring" in home applications....but even then the wires carry a full range signal and the speakers crossovers take care of the direction.
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Old Oct 16, 2004
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As I said above, MB Quart uses "biwire" to refer to biamping.
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Old Oct 17, 2004
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Guys, as far these Quarts go, Biwire and BiAmp are two different things. BiWire means you are still using ONE channel on ONE amp to drive ONE Xover. It is like Brash said up above. Take the two inputs you would normally run high to one amp and low to another to biAmp, well instead, you are running high and low pos together into one channel and high and low neg into the same channel.
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