Unbalanced cables are the cables that are commonly used for connecting audio devices such as headphones and musical instruments like guitars or bass.

Cables that only have a contact point for the shield and one signal are unbalanced, they consist of two conductors: a signal wire (the “Hot” wire) and a ground wire.

The signal wire carries the audio signal from the audio devices, while the ground wire serves as the reference point of the audio signal, and also shields the signal from interference. 

However, they are more susceptible to noise and interference over longer cable runs, which can result in audible hums or buzzing in your audio.

Balanced cables on the other hand, has three conductors: two signal wires; “Hot”(Positive) and “Cold” (Negative) and a ground wire. The two signal wires carry the audio signal in opposite polarity, which helps cancel out any interference picked up along the way.

It’s design to minimize interference and provide the best possible audio quality over long distance, making them the preferred choice for professional audio applications.
 

So now we know, Balanced cables use two signal wires(Hot and Cold), but how does this extra wire makes the cable length and interference cancel ability way much better than unbalance cable?

When the balanced cable receives signal, both of the signal wires will carry a copy of the signal, but the trick is; these two signals are sent with their polarity reversed. If you’re new to the audio field, here’s the new concept: If you combine two signals that are identical but with their polarity reversed, the signals will be in the “Phase Opposition” and the signal will cancel out, leaving you with complete silence, this is call “Out of Phase”. (Imagine adding positive and negative numbers: +10 added to -10 equals 0.)

So why would you want audio gear that flips the polarity of your signal? In this case, because the receiving gear will flip the inverted signal back into its original orientation. But because both copies of the signal picked up the same noise as they traveled along the cable—and that noise is identical on the two wires in the cable—flipping the polarity of what arrives at the receiving gear will produce the original signal intact and noise which now has reversed polarity. Summing that gives you a welcome result: signal that’s preserved and noise that’s canceled.

Because of this, balanced cables can support much longer cable runs than unbalance cables; around 300 feet(90-100meters) maximum. The wiring for microphones, and the interconnect cables between consoles, signal processors, and amps, etc.,  in a pro sound system or recording studio environment are typically of the balanced variety. 

 

RCA Cables

RCA cables are widely used for unbalanced analog audio connections. They typically consist of a red tip (right channel) and a white or black tip (left channel). RCA unbalanced signals are best suited for shorter distances, usually not exceeding 25 feet.

Quarter-Inch TS Cables

Quarter-inch TS (tip, sleeve) cables are commonly used for unbalanced signals, particularly with musical instruments like electric guitars or bass connecting to amplifiers. These cables provide a straightforward connection and are ideal for short-distance applications.
 

XLR Cables

XLR cables are commonly used for balanced audio signals, especially in professional audio setups. These cables consist of three male pins inside the connector: the ground wire, the hot signal, and the cold signal which we’ve already covered before. XLR cables can transmit balanced audio signals up to 300 feet without having the risk of losing audio quality.
 

Quarter-Inch TRS Cables

Quarter-inch TRS or 6.35mm TRS cables are another type of balanced cable in professional audio system. They can transmit either mono (balanced) or stereo (unbalanced) signals. The structure of a quarter-inch TRS cable is quite similar to the XLR which are two signals(tip, ring) and 1 ground(sleeve) and allows for balanced audio transmission and is commonly used in various audio applications like meeting rooms and auditorium.
 

Unbalanced and balanced audio cables are quite distinct regarding sound quality and noise resistance. Here’s a breakdown of their key differences:

1.Noise Resistance: Balanced audio cables are designed to reduce the risk of picking up unwanted noise, making them great for maintaining a clear sound. On the other hand, unbalanced cables can sometimes pick up annoying hums or buzzes, particularly if used in certain places or situations.

2.Signal Strength: Balanced audio is the way to go if you want a strong and clear audio signal without any unnecessary disturbances. It ensures that the sound remains sharp and pristine.

3.Transmission Distance: For cable lengths, you can clearly notice unbalanced audio cables are more likely to get noisy and have interference the further they stretch.

4.Cable Construction: The way unbalanced audio cables are made, particularly the inclusion of the ground wire, can be a source of the extra noise. This construction contributes to their tendency to pick up interference.

In conclusion, if you want cleaner and more consistent audio, especially over long distances, balanced cable is your superior choice, while unbalanced audio cables may also been a good choice in shorter, less demanding setups but come with a higher risk of noise.

 

When deciding between balanced and unbalanced cables, it’s important to consider the specific requirements of your audio setup. Unbalanced cables are suitable for short distances and lower-budget setups where the risk of distortion is minimal. Balanced cables are ideal for longer distances, professional audio applications, and environments with higher susceptibility to noise.

Well, no, remember that the better choice depends on your specific needs. Unbalanced audio can still be a good choice for short cable runs and less congested electronic environments, and scenario that doesn’t require long distance transmission and audio quality requirement. Also, we need to pay attention to the interfaces on the devices like mixer, digital audio processor or amplifier, some might only support unbalance signal, so even if you’re using balanced cable, the signal will still runs on unbalance, causing unnecessary waste on budget.

In sound system or studio recording system, the choice between balanced and unbalanced audio cables is crucial to achieving high-quality and noise-free sound in your audio production. The unbalanced cable are suitable for short distance and certain setups that has requirement on budget, or maybe the audio gears doesn’t support balanced signal. Balanced cables offers better noise rejection, audio quality and transmission distance. By understanding the differences between these two types of cables, you can make informed decisions that improve your audio quality and meet your specific needs.



Reference:
https://www.aviom.com/blog/balanced-vs-unbalanced/

https://www.yololiv.com/blog/balanced-vs-unbalanced-audio-whats-the-difference/

https://hosatech.com/press-release/balancing-act/?srsltid=AfmBOooNUMVhKUqkH-jELooX6IJQJMLYP3ofcx5NNM9oKLHZHSvdb3ZQ

https://castr.com/blog/balanced-vs-unbalanced-audio/

https://www.moon-audio.com/blogs/expert-advice/single-ended-versus-balanced-connection-audio-gear?srsltid=AfmBOorw3f6zjtM_9L7Vi05Oa21HVQTEnDLd51AQXH7MmEsm2wokteXH

https://hedd.audio/blog/unbalanced-vs-balanced-cables-understanding-the-difference