I am Not hurting anything right ??

In response to your question, you are not hurting your speakers in the current setup, but you might be hurting your amplifier. Your amp sends out power over two cables to the + terminal, and the wire is shorted out when it gets there, its like connecting two wires together at the end. Could cause some type of mismatch or something if the wires are not exactly the same or whatever. Not a big risk so don't worry too much.

Try reading Jon Risch's website regarding the "technicalese" on bi-wiring.

As to bi-wiring feeding the same signal to both sets of terminals, that is not necessarily so. On a speaker that is TRULY designed to be bi-wired, the two sections are completely independent of each other. Using the factory supplied jumpers simply ties the whole circuit together. Once the jumpers are removed, you now have two seperate frequency selective paths for the signal to take. While this is the type of "bi-wiring" that MAY result in sonic benefits, it would be negated by using an "all in one" type of bi-wired speaker cable. You would literally need a seperate run of cables for the lows and a seperate run for the highs to achieve optimum results.

As to speakers that were designed for bi-wiring as an afterthought or as a marketing gimmick, you might not gain anything other than the lower resistance of using more wire as a conductor. In itself, this is not a bad thing but hardly worth the extra money. Sean
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I used to teach basic electronics at a Vo-tech. I feel a need to clarify the bi-wire issue because I believe that some do not understand the electrical circuit. As Sean describes above a true bi-wireable speaker has a electrically separate crossover for each driver. Most speakers have separate crossovers for each driver but they are not electrically separate because the input to both of the crossovers (in a two-way speaker; one a high pass to tweeter, the other a low pass to the woofer) are tied together to the single pair of input jacks on the back of the speaker. In a bi-wireable speaker, if the jumper is removed between the two pairs of inputs and only one of the pairs has hooked up, then only one speaker will produce sound. This is a sure fire way to see if the crossover sections are independent.

Sdcampbell you are partially correct that you are feeding the same VOLTAGE to both sections of the crossover. Both pairs of wires connect to the same + & - terminals on the amp and then each pair of wires is connected to the drivers thru the crossovers. This is like connecting two toy DC motors to a single battery, both motors will 'see' the voltage and both motors will turn.

A speaker is a current driven device. The current flowing thru the voice coil reacts with the magnet to produce movement of the cone. (yes, I am sure you all know this but I am only trying to be complete) It is the job of the crossover to direct the appropriate audio current into each driver. This is done by what is called the voltage divider principle. This principle is based on Ohm's law that states the current flowing thru a circuit is proportional to the voltage applied and inversely proportional to the resistance. If you were to take two 6 ohm resistors and connect them in series and place them across a 12 volt battery, 1 amp of current would flow. (ohm's law) If the resistors were doubled in value then the current would be cut in half. Now, lets look at the voltage. The voltage across one of the resistors is determined by taking the current thru it (1 amp) and multiplying it by it's resistance (6 ohms) to arrive at a voltage of 6 volts. The 12 volt battery has been 'divided' down to six volts. The crossover in series with the speaker works the same way, only it is frequency selective. In the case of the woofer crossover, it only 'passes' the low frequency voltage to the woofer and blocks the high frequencies.

The major advantage to stretching separate wires to the woofer and tweeter is the separation of the audio frequency currents in the wires. Even though the voltage is the same on both pair of wires, the currents are not. If speaker cables were perfect, then we would hear no differences in cables. If they were perfect, it would not make any difference if both high and low frequency currents flow in the wires. It is the separation of the currents in the cables that does the most to affect the sound. Does it not seem possible that the large woofer currents could affect the small tweeter current while it traveled down the wire? It is the fact that the currents are different that makes me think one could 'tune' their speakers by using different cables on the top and bottom.

A manufacturer might not recommend bi-wire because he has voiced his speaker to take into account the interaction inside the single cable. (I am not sure how this could be done, but it always possible) If everyone were to follow recommendations, why would anyone try a different cable than the one recommended. I believe the answer is found within the context of taste. I like my 'sound' to be a certain way. I position my speakers and use 'xyz' brand equipment to make them sound the way I want. Just because a manufacturer doesn't recommend bi-wiring, does that automatically mean that I won't like it that way? It is a personal choice and I feel strongly about the option to make that choice! If I feel a speaker sounds better upside down, what is wrong with me using it that way?

I want to thank all of the Audiogon posters for their comments about the sound of equipment in this and other posts. I reside in the middle of no audio land. I really like to read the opinions of others on equipment. I believe our motives for saying something good or bad about a piece of gear is at least NOT ruled by our paychecks!

I really hope this dissertation sheds light on the bi-wire topic and will help guide all in the pursuit of good sound.

Sqjudge, I'm confused. Regardless of whether bi-wiring is or is not beneficial (and I bi-wire in my main system), I just don't understand how the signal, current or whatever can be different, coming from the same source. Doesn't the amp send the entire signal to whatever crossover is at the other end of the circuit? And isnt the circuit completed at the crossover, which sees the entire signal regardless of what it passes on to the driver?

Sean, some speaker makers include bi-wiring terminals because the retail market demands it, even though the designer/maker doesnt think it does any good. Some people just won't take a speaker seriously unless its bi-wireable and some people have already invested in the cables they want to use with their new speakers. I wouldnt call it an afterthought or marketing gimmick.

Paulwp - The point, I believe, is that current is the same throughout a series circuit. The + speaker wire, the crossover and driver, and the - speaker wire comprise a series circuit. The amount of current for a given voltage applied depends on the impedance of the load - the crossover/driver, but it is the same in the entire circuit. That is; there is not a lot of current down the + wire to the post, then a little current through the load, then a lot of current back through through the - wire. (Discussion of electromagnetic field needed here, but beyond scope) The crossover is frequency sensitive and represents a high impedance to frequencies outside its bandpass. Current resulting from voltage alternating at frequencies outside its bandpass is therefore relatively small and it is so through the entire series circuit including the wires. No harm is being done by biwiring with the jumpers in place, however. It is the same as running two wires to each post of non-biwirable speakers - each "polarity" wire of the set is simply common at both ends - you are just running more wire in parallel to each post. Do your speaker wires have multiple strands? Same thing. Some may feel that it is advisable to do or not do one or the other because of different sound, but that is a different discussion. :)