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| *What is bi-wiring? Bi-wiring is where the crossover inside the speaker has been separated into it's HF and LF sections, and separate pairs of connecting terminals provided to access those separate sections independently. Normally, the LF and HF crossover sections are in parallel, connected internally to the same single pair of binding posts. For single cable use, a set of jumpers is provided to bridge the terminal pairs, paralleling the separated crossover sections outside the cabinet instead of inside. Then, separate speaker cables are run from the same amp output to these separated pairs of terminals at the speaker. *What good does bi-wiring do? Some say that any improvement in the sound it makes is strictly due to the decreased total DCR, and this makes the speaker less prone to frequency response variations due to cable resistance. According to this view, simply running the two cables in parallel at both ends will do the same thing. In my opinion, this is a very simplistic and incomplete way of looking at the situation. Once the crossovers have been electrically separated, they present different impedances (loads) to the power amp within their passbands and outside of their passbands. The woofer and corresponding low frequency crossover section will present a low impedance at low frequencies and a high impedance at HF, while the tweeter section will present a low impedance at high frequencies, and high one at LF's. With the electrical separation, differing currents will flow within the two cables that make up a bi-wire set. For the separate cable feeding the woofer section, a lot of current will flow at LF's but not much current at HF's, and the tweeter cable will have some current flow at HF, but very little at LF's. A division of labor has occured with bi-wiring, whereby a single cable does not have have to carry the HF currents simultaneuously with the LF current. |
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