Quad Audio Balun - AV Extender MuxLab - Free user manual and instructions

Product Type	Quad Audio Balun (AV Extender)
Brand	MuxLab
Model	500033
Number of Audio Channels	4 mono (or 2 stereo)
Transmission Media	Cat 5E/6 UTP/STP cable
Connectors	4 x RCA (audio), 1 x RJ45
Bandwidth	20 Hz – 20 kHz
Input Impedance (Source)	100 Ω (max.)
Output Impedance (Receiver)	10 kΩ (min.)
Insertion Loss	< 2 dB per pair
Common Mode Rejection Ratio	> 60 dB @ 1 kHz
Total Harmonic Distortion	< 0.007% @ 1 kHz
Maximum Input Level	1.1 Vp-p
Ground Loop Isolation	±50 VDC
Maximum Distance	3250 ft (1 km)
Operating Temperature	0°C to 55°C
Storage Temperature	-20°C to 85°C
Humidity	Up to 95% non-condensing
Enclosure Material	Fire retardant plastic
Dimensions (W x D x H)	2.40 x 2.25 x 1.00 in (6.10 x 5.72 x 2.54 cm)
Weight	3.6 oz (103 g)
Power Supply	Passive (no external power required)
Maintenance & Cleaning	Wipe with a dry, soft cloth. Do not use liquids or solvents.
Safety	For indoor use only. Keep away from moisture and extreme temperatures.
Spare Parts & Repairability	Lifetime warranty. Contact MuxLab for service or replacement.

Frequently Asked Questions - Quad Audio Balun MuxLab

What is the MuxLab Quad Audio Balun used for?

The Quad Audio Balun transmits up to four unbalanced line-level analog audio signals over a single Cat 5E/6 twisted pair cable. It eliminates multiple coaxial cables and is ideal for connecting DVD players, audio receivers, mixers, and matrix switchers.

Do I need to use two Quad Audio Baluns?

Yes, they are used in pairs: one at the source and one at the receiver. A single balun cannot work alone as it only converts the signal from unbalanced to balanced (or vice versa).

What type of cable is required?

Standard Cat 5E or Cat 6 UTP/STP cable with solid copper twisted pairs (24 AWG or lower). The impedance should be 100 ohms at 1 MHz. Maximum capacitance is 20 pF/ft.

How far can I transmit audio?

The maximum distance is 3250 feet (1 km) using Cat 5E/6 cable. For longer distances, a signal repeater may be needed.

Why is there no audio or poor quality?

Possible causes: EMI interference, split pairs, open contacts, or defective balun. Check wiring, ensure twisted pairs are intact, and try replacing the balun. Refer to the troubleshooting table in the manual.

Does the Quad Audio Balun require power?

No, it is a passive device and does not need an external power supply. It works by impedance transformation.

What is the pin configuration for the RJ45 connector?

Audio 1: Pins 7 (Ring) & 8 (Tip); Audio 2: Pins 3 & 6; Audio 3: Pins 4 & 5; Audio 4: Pins 1 & 2. Wiring must be straight-through (Ring to Ring, Tip to Tip).

Can I use the Quad Audio Balun with stereo signals?

Yes. A pair of baluns can support two stereo channels (left/right) using two twisted pairs each. For four mono signals, use all four pairs.

What is the warranty for this product?

MuxLab offers a lifetime warranty on the Quad Audio Balun. For replacement or repair, contact MuxLab customer support.

How do I clean or maintain the Quad Audio Balun?

Wipe the enclosure with a dry, soft cloth to remove dust. Do not use any liquids, solvents, or abrasive cleaners. Ensure the device is kept in a dry, indoor environment.

USER MANUAL Quad Audio Balun MuxLab

Environment	Unbalanced line-level analog audio.
Devices	DVD players, audio receivers, audio amplifiers and audio mixers, audio matrix switchers and other unbalanced line-level audio equipment.
Transmission	Transparent to the user
Bandwidth	20 Hz to 20 kHz
Peripherals' Impedance	Source 100 Ω Mx, Receiver 10 kΩ min.
Insertion Loss	Less than 2 dB per pair over the frequency range
Common Mode Rejection Ratio	Greater than 60 dB at 1 kHz
THD	Less then 0.007% @ 1 kHz
Maximum Input Level	1.1 Vp-p
Impedance Transformation Ratio	Single unit: 4:1 (source: line)
Cable: Cat 5E UTP/STP	24 AWG or lower solid copper twisted pair wireImpedance: 100 ohms at 1 MHzMaximum capacitance: 20 pf/ftAttenuation: 6.6 dB/1,000 ft at 1 MHz
Unbalanced In/ Out Cable	Shielded, coaxial
Ground Loop Isolation	Range of +/-50VDC
Connectors	Four (4) RCA receptacles for audio, one (1) RJ45 jack
Pin Configuration	Audio 1: Pins 7(R) & 8(T)Audio 2: Pins 3(R) & 6(T)Audio 3: Pins 4(R) & 5(T)Audio 4: Pins 1(R) & 2(T)
Max. Distance:Cat 5E/6 UTP/STP	3250 ft (1 km)
Temperature	Operating: 0° to 55°CStorage: -20° to 85°CHumidity: Up to 95% non-condensing
Enclosure	Fire retardant plastic
Weight	3.6 oz (103 g)
Dimensions	2.40" x 2.25" x 1.00" (6.10 x 5.72 x 2.54 cm)
Warranty	Lifetime
Order Information	500033 Quad Audio Balun

Quad Audio Balun
500033
Quick Installation Guide

Overview

The Quad Audio Balun allows up to four (4) analog line audio signals to be transmitted via an unshielded twisted pair (UTP) cable in a point-to-point connection. Used in pairs, the Quad Audio Balun eliminates up to four (4) coaxial cables, allowing audio-video equipment to be connected via a space-efficient and cost-effective Category 5E/6 twisted pair cable and supports Hi-Fi audio signal transmission. The Quad Audio Balun also works in conjunction with other MuxLab analog audio baluns such as the 500019.

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Installation

One (1) pair of baluns supports four (4) mono unbalanced analog audio channels or two (2) stereo audio channels via a Cat 5E/6 twisted pair. To install the baluns, perform the following steps:

1. Identify the pin configuration of the baluns. Four (4) twisted pairs are required if all four (4) signals are transmitted. The pin configuration follows the EIA/TIA 568A/B standard. The Quad Audio Balun is reverse polarity sensitive. Please ensure that wiring is straight-through (Ring to Ring, Tip to Tip).
2. At the audio source end, connect a Quad Audio Balun to the audio output using the appropriate number of RCA cables.
3. At the audio receiver end, connect a Quad Audio Balun to the audio input using the appropriate number of RCA cables.
4. Complete the connection between the two baluns, using standard Cat 5E/6 twisted pair cable and connecting hardware, terminated on RJ45 plugs at both ends. Ensure that there are no split pairs or taps.
5. Power-on the audio equipment. Check the sound quality and refer to the troubleshooting table below if the sound quality is unsatisfactory. The following diagram shows a typical installation.

Troubleshooting

The following table describes some of the symptoms, probable causes and possible solutions in respect to the installation of the Quad Audio Balun:

Symptom Probable Cause Possible Solutions
Poor Quality Audio	EMI interference	Check that wiring is not too close to transformers and ballasts.
	Split pair	Check if the UTP pairs are split and correct. Each signal pair must be twisted.
	Power-off Check power supply.
	Open contact Check wiring to ensure continuity.No Audio
	Defective Audio Balun Change Audio Baluns for another pair.
Weak Audio	Distance exceeds specs	Check DC loop resistance and verify if distance spec is exceeded. Reduce cable length or eliminate high-loss components.
	Lower grade UTP cable is introducing high signal losses.	Use signal repeater for extended distance. Replace cable by higher grade.

If you still cannot diagnose the problem, please call MuxLab Customer Technical Support at 877-689-5228 (toll-free in North America) or ([phone] (International).