21TECHNICALLY SPEAKING

Balanced and Unbalanced Input Lines

Recording and broadcast studios use balanced connections exclusively because of their inherent ability to reject noise and hum, thus assuring the best sound. Certain high quality preamplifiers and surround controllers built for residential use utilize balanced connections with XLR jacks for the same reasons. The Parasound P 3 Preamplifier and all Parasound Halo power amplifiers have balanced inputs with XLR jacks so you can take full advantage of their inherent noise rejection capability and superior sound quality.

Unbalanced connections with RCA jacks are found on all home audio equipment. RCA jacks and two- conductor wires are less costly than the additional circuitry, higher priced XLR connectors and three- conductor wiring required for balanced connections.

In an unbalanced line, the positive audio signal appears at the center pin of the RCA jack and the negative signal on the outer shield wire, which also functions as the ground connection. Unbalanced interconnect cables are vulnerable to hum from an AC line, or other noise, such as RFI (Radio Frequency Interference), which can be reproduced through your loudspeakers. Since the unbalanced line’s ground also carries the audio signal, there is no way for the connected amplifier or preamplifier to distinguish between the audio signals you want and unwanted noise emanating from external sources.

Balanced lines are superior because they utilize separate conductors for audio and ground: two inner conductors carry the positive and negative audio signal, and a third outer wire connects the grounds and also shields the two signal conductors. When the positive and negative signals appear at the component receiving the signal they are equal, but 180 degrees out of phase with each other with respect to ground. To send and receive balanced signals requires special differential circuitry.

A differential input circuit amplifies only the difference between the positive and negative signals. For example, when a 1 Volt signal arrives at a balanced input stage, the differential input “sees” a positive 1 Volt minus a negative 1 Volt, or 2 Volts total. External hum and noise that somehow gets into a balanced line is common to both its positive and negative conductors with respect to ground. Therefore, it is canceled or rejected by the differential input circuit.

This phenomenon of rejecting noise signals common to both positive and negative conductors is called

common-mode rejection. Differential inputs are specified according to how well they reject signals common to both conductors. This is measured in dB and is called the common mode rejection ratio or CMRR.

Other Antenna Options

Outdoor Antenna

For best reception and maximum noise rejection, we recommend the use of a high-quality outdoor FM antenna. Although this requires a little extra effort, the additional stations you can receive and the superior sound quality will be worth the investment. For best noise rejection, use a 75 Ω cable with an “F” connector and connect it directly to the 75 Ω coaxial antenna connector on your T 3. If you use 300 Ω “twin lead” cable, use the balun adapter as described previously.

Cable TV Connection

Many cable TV companies include FM radio stations and TV audio along with their cable TV channels. Check with your local cable company about the availability of FM stations and possible additional charges for this service. FM quality depends on the quality of the cable operator’s equipment. Your T 3 connects to the cable with a signal splitter in the same fashion as you would connect a second television: The signal splitter’s input connects to the incoming cable and its outputs are a 75 Ω F connector for your television and either a second 75 Ω F connector or 300 ohm terminals for your T 3.

Powered Antennas

A small powered indoor antenna is sometimes useful when it's impractical to install an outdoor antenna or where FM transmission is not available via cable or a community TV/FM antenna. However, powered antennas sometimes add noise and distortion to the RF signal. In most cases, you can receive signals better with the supplied dipole antenna.

Using the T 3 with Infrared Repeater Systems

External Remote Input and Loop Out

The External Remote input allows for infrared remote control operation via a wired infrared repeater system or system controller when infrared commands cannot directly reach the front panel infrared receiver. This input connector accepts a standard 1/8" (3.5 mm) two- conductor mini-plug. The tip is positive and the sleeve is negative. Your Authorized Parasound Dealer or Custom Installer can recommend a compatible infrared repeater system for the T 3. The External remote circuit has a loop output so you can connect additional IR controlled devices.

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Parasound T 3 manual Technically Speaking, Balanced and Unbalanced Input Lines
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T 3 specifications

The Parasound T 3 is an advanced stereo tuner designed for true audio enthusiasts who seek high-quality performance and superior sound reproduction. This tuner represents Parasound's legacy in crafting reliable and high-performance audio equipment.

One of the standout features of the T 3 is its impeccable FM and AM reception capabilities. It utilizes a high-quality digital signal processor that significantly enhances sound clarity while minimizing noise and interference. This is especially beneficial for listeners in environments with fluctuating signal strengths, ensuring consistent audio quality.

The T 3 incorporates a sophisticated RF front end that includes a wide bandwidth FM section, enabling reception of both standard FM broadcasts and HD Radio, which delivers enhanced audio quality and numerous additional channels. With its advanced digital processing, the tuner automatically selects the best signal and filters out unwanted noise, resulting in a listening experience that is both rich and detailed.

A notable characteristic of the T 3 is its elegant and user-friendly design. The front panel features an easy-to-read display that indicates the station frequency, signal strength, and mode of operation. Additionally, it includes a multi-function dial for intuitive browsing through preset stations, allowing users to store up to 40 of their favorite channels for quick access.

For audiophiles, the Parasound T 3 supports a variety of output options, including standard analog outputs and digital outputs for those looking to integrate it with a modern audio system. This flexibility ensures compatibility with a wide range of audio components, making it an ideal addition to both traditional and contemporary setups.

Furthermore, the T 3 is engineered with high-end components that deliver minimal distortion and exceptional dynamic range. Its robust construction not only enhances durability but also prevents vibrations that can affect sound quality, thereby ensuring that performance remains uncompromised over time.

With its combination of cutting-edge technology, elegant design, and superior audio performance, the Parasound T 3 stands as a premier choice for anyone seeking a high-quality tuner that elevates their listening experience. Whether you're a casual listener or a dedicated audiophile, the T 3 promises to deliver an unparalleled sonic experience that showcases the best in radio broadcasting.
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