Dual ended cables are common enough when it comes to audio and data signals.
The two main issues I know of in regards to dual ended cables would be cross wiring, which is part of the reason there are accepted standards for cables and connector types. If you follow the standards, you should never set it up for a cross wiring situation.
The other issue involves power cords, specifically a cord with 2 male ends. Pretty dangerous. Easy to short out on something metal or to get shocked by grabbing the exposed conductors. There would also be the chance of energizing a circuit that was thought to be off. An example of this problem occurs yearly during storm season when people set up generators. You can power a house easily with a big enough generator, and they make what is called a disconnect switch to do so safely. The DS separates the house from the power lines while the generator is being used to power the house. The only safe way to do things. However, the same thing can be accomplished with a 2 ended cable that plugs into the 220v dryer outlet. I believe you're supposed to flip the main circuit breaker while doing this work-around. Not sure, I like doing things the right way. If the breaker isn't flipped the genset can send voltage back into the power grid, potentially killing a worker.
That tangent aside, lol, the cable for the headphones I mentioned is directional, IE one end is for the headset, one for the source. Still uses standard audio jacks, but the headset end has extended molding and a recessed socket on the headset. Other than my given reason for liking the removable cord, there's also the fact that some people prefer a coil cord and some prefer a straight cord. I kinda like the fact that it came with all 3. Coiled is nice for the iPod, short straight for the booth, and the 3 meter cord for listening to music on the home system.
The two main issues I know of in regards to dual ended cables would be cross wiring, which is part of the reason there are accepted standards for cables and connector types. If you follow the standards, you should never set it up for a cross wiring situation.
The other issue involves power cords, specifically a cord with 2 male ends. Pretty dangerous. Easy to short out on something metal or to get shocked by grabbing the exposed conductors. There would also be the chance of energizing a circuit that was thought to be off. An example of this problem occurs yearly during storm season when people set up generators. You can power a house easily with a big enough generator, and they make what is called a disconnect switch to do so safely. The DS separates the house from the power lines while the generator is being used to power the house. The only safe way to do things. However, the same thing can be accomplished with a 2 ended cable that plugs into the 220v dryer outlet. I believe you're supposed to flip the main circuit breaker while doing this work-around. Not sure, I like doing things the right way. If the breaker isn't flipped the genset can send voltage back into the power grid, potentially killing a worker.
That tangent aside, lol, the cable for the headphones I mentioned is directional, IE one end is for the headset, one for the source. Still uses standard audio jacks, but the headset end has extended molding and a recessed socket on the headset. Other than my given reason for liking the removable cord, there's also the fact that some people prefer a coil cord and some prefer a straight cord. I kinda like the fact that it came with all 3. Coiled is nice for the iPod, short straight for the booth, and the 3 meter cord for listening to music on the home system.
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