Stop The Hum and Buzz in Your Audio Setup
You know the feeling. You are setting up for a big live gig or a critical recording session. You plug in the mic, turn up the gain, and there it is—that annoying low-frequency hum or a hissing noise that ruins the track. It is not the microphone’s fault. It is not the mixer’s fault. It is the cable picking up noise from the lights, the power lines, or the Wi-Fi router next door. This is the biggest headache for sound engineers, installers, and studio owners. You need a cable that fights back against interference. You need a cable that keeps your signal pure from the mic to the mixer. That is exactly what the Belden 1172A is built for. It is not just a wire. It is a shield for your sound.This cable is a legend in the industry. It is made in the USA by Belden, a company that has been setting the standard for cable performance for decades. When you use the 1172A, you are using the same cable that major broadcasters, recording studios, and live venues rely on every day. It solves the noise problem before it even starts. Let’s look at how it does this and why it is the right choice for your next project.
What Makes the 1172A a “Balanced” Cable?
You hear the term “balanced cable” all the time. But what does it actually mean for you? A balanced cable has two wires inside that carry the audio signal. These two wires are twisted together. When the cable picks up noise from the outside world, the noise hits both wires equally. When the signal reaches the end of the cable, the equipment flips one of the wires and adds them together. The noise cancels out because it is the same on both wires. The audio signal stays because it is different on the two wires. This is called Common Mode Rejection.The Belden 1172A takes this to the next level with a “Star Quad” design. Most balanced cables have just two conductors twisted together. The 1172A has four conductors arranged in a star shape. Two opposite wires act as one positive signal, and the other two opposite wires act as the negative signal. This geometry is like a force field. It creates a tighter magnetic field cancellation. It rejects electromagnetic interference (EMI) and radio frequency interference (RFI) much better than standard twisted pairs. If you are running cables near power lines or in walls with electrical wiring, this star quad design is your best friend. It ensures that the only thing traveling down the wire is the voice or the music—not the buzz of the building’s electricity.
Technical Specs That Matter to You
You need hard numbers to make a decision. Here is the breakdown of the Belden 1172A specifications and what they mean for your real-world use.
Physical Build and Materials
- Conductor: 4 conductors, 26 AWG (American Wire Gauge). This is stranded bare copper (SBC). The strands are 30×40, which means 30 strands of 40 AWG wire twisted together. This makes the cable very flexible. It does not break if you bend it or step on it during a live show.
- Insulation: Polyethylene (PE). This material is tough and has low electrical loss. It keeps the signal strong over long runs.
- Shield: 95% coverage tinned copper braid. This is a “French Braid” shield. It is dense and covers almost the whole cable. It blocks outside noise from getting in. The drain wire (28 AWG) makes grounding easy.
- Jacket: PVC (Polyvinyl Chloride). This is the black outer skin. It is durable, oil-resistant, and flame-retardant. It is rated for indoor use (Plenum rated versions exist, but the standard 1172A is general purpose).
- Outer Diameter: 0.190 inches (about 4.8mm to 5mm). This fits perfectly into standard XLR connectors and cable snakes without being too bulky.
- Origin: Made in the USA. Belden manufactures this in their US facilities to strict quality controls.
Electrical Performance
- Impedance: 40 Ohms (balanced). This is the sweet spot for professional microphones. It matches the output of most mics and the input of most preamps.
- Capacitance: 39.2 pF/ft (conductor to conductor). Low capacitance is crucial. High capacitance acts like a filter that cuts off the high frequencies (treble). With low capacitance, your audio stays bright and crisp, even over 100 feet of cable.
- Resistance: 36 Ohms per 1000 ft. This is very low. It means you don’t lose signal volume over distance.
- Velocity of Propagation: 66%. This is how fast the signal travels down the wire. It is fast enough that you will never notice a delay, even in the largest stadiums.
- Voltage Rating: 100V. This is more than enough for any microphone signal (which is usually less than 2V).
- Temperature Range: -20°C to +60°C. It works in cold outdoor winter gigs and hot stage lighting rigs.
Where Should You Use the 1172A?
This cable is a workhorse. It is designed for professional audio signals. Here are the specific scenarios where it shines.
Professional Microphone Connections
This is the main job. Connecting dynamic or condenser microphones to mixers, audio interfaces, or preamps. The 4-core design allows you to wire standard XLR connections (Pin 2 and Pin 3) while keeping the ground separate. It is perfect for:
- Live Sound: On stage, where there are dimmer packs, LED walls, and wireless systems creating a lot of RF noise.
- Recording Studios: For patch bays and connecting outboard gear. The low noise floor is critical for capturing quiet vocals or acoustic instruments.
- Broadcast: TV stations and radio stations use this for their main audio lines because reliability is non-negotiable.
Instrument Cables (with adapters)
While it is a mic cable, many engineers use 1172A for balanced line-level signals. If you have active DI boxes or balanced instruments (like keyboards), this cable works great. It prevents ground loops and hum.
Security and Intercom Systems
Because it has 4 conductors, you can use it for low-voltage control signals. Some security companies use it for camera audio or intercom systems where you need power and audio in one run (though power over mic cable is not recommended for long distances, the extra cores can handle low current signaling).
Why Choose Belden 1172A Over Generic Cable?
You can buy cheap microphone cable online. But “cheap” often means “noisy.” Here is why the 1172A is worth the investment.
Consistency is King
When you buy a 1000ft spool of Belden 1172A, you know exactly what you are getting. The impedance is consistent. The shielding coverage is exactly 95%. Cheap cables might claim 95% shielding, but in reality, it could be 70% with gaps. Those gaps let noise in. Belden’s manufacturing process ensures every foot of cable meets the spec. This saves you time on troubleshooting. You don’t have to test every cable you crimp. You crimp it, plug it in, and it works.
Durability Saves Money
The PVC jacket on the 1172A is thick (0.030 inches). It resists abrasion. If you drag a cable case over it, it won’t split open. The strain relief in the connector is helped by the flexible 30×40 stranded copper. It doesn’t work-harden and snap like solid core wire. For rental companies and installers, this means fewer returns and fewer replacement costs.
The “Star Quad” Difference
If you compare a standard 2-conductor mic cable to the 1172A side-by-side in a noisy environment, the difference is obvious. The standard cable will pick up a 60Hz hum from the lights. The 1172A will be silent. This is why major venues specify Belden star quad cable for their permanent installs. They don’t want to rip out the walls later to fix a noise issue.
Color Coding and Packaging Options
Belden makes it easy to organize your cable runs. The 1172A comes in several jacket colors so you can color-code your stage or studio.
- Black (B59): The standard. Most common.
- Red (G7V): Great for right-channel audio or positive power lines.
- Green (G7W): Good for left-channel audio.
- Blue (G7X): Often used for data or specific control lines.
- Yellow (G8M): Good for caution or specific audio buses.
- Gray (U90): Neutral color for clean looks.
- Purple: Available for special custom runs.
You can buy it in 500ft (152m) or 1000ft (305m) spools. The weight is about 11-12kg per 1000ft spool, which is manageable for shipping. The packaging is usually a crate reel or a cardboard box, designed to protect the cable from crushing during transit.
Installation Tips for Best Performance
To get the most out of your Belden 1172A, follow these simple rules. Even the best cable can fail if installed wrong.
Don’t Exceed the Bend Radius
The minimum bend radius is 1.9 inches (about 5cm). Don’t kink the cable. If you bend it too sharp, you deform the geometry of the star quad. This ruins the noise cancellation. Keep the curves smooth.
Keep Away from Power Cables
Even though the 1172A has great shielding, don’t run it right next to a high-power AC cable for long distances. If you have to cross them, cross at a 90-degree angle. This minimizes the magnetic field interference.
Use Proper XLR Connectors
Use high-quality XLR connectors like Neutrik or Amphenol. Make sure the strain relief boot is long enough to cover the cable jacket. When soldering, use a temperature-controlled iron. Don’t overheat the wire, or the insulation will melt and cause shorts.
Ground Loops
The shield is great, but it can cause ground loops if you are not careful. In complex systems, ensure you are grounding the shield at only one end (usually the mixer end) to avoid that low-frequency buzz. The drain wire makes this connection easy.
Compliance and Standards
This cable meets the standards that matter for professional work.
- RoHS: It is compliant with EU RoHS directives (though some older stock may predate specific dates, current production is compliant). It restricts hazardous substances like lead.
- UL: Listed for flame resistance.
- CSA: Certified for Canadian safety standards.
- CE: Meets European safety, health, and environmental requirements.
If you are doing a project for a government building, a museum, or a corporate office, these certifications are often required for fire code approval. The Belden 1172A checks all those boxes.
Get Your Quote Today
You are looking for a reliable, high-performance balanced microphone cable. You need it to be made in the USA with consistent quality. You need it to reject noise in tough environments. The Belden 1172A is the industry standard for a reason. It works. It lasts. And it sounds great.We are a foreign trade cable production enterprise, and we understand the needs of the global market. We can supply the Belden 1172A in bulk quantities, cut to length, or assembled with connectors. Whether you are an audio integrator in London, a rental house in New York, or a broadcaster in Sydney, we can ship to you.Don’t settle for noisy cables that compromise your reputation. Use the cable that the pros use.Contact us now for a competitive quote. Tell us the length, the color, and the quantity you need. We will get back to you with the best price and lead time. Let’s keep your audio signal clean and your clients happy. Send your inquiry today.