CONNECTING THE PREAMPLIFIER

AUDIO CONNECTIONS

•Microphone input connections are made using the female XLR connector on the rear panel. This connector is wired with pin 2 positive, pin 3 negative and pin 1 ground. 48V phantom power, if used, is supplied on pins 2 and 3.

•Instrument or line input connections are made using the ¼” TRS jack on the front panel. This connector is balanced with the Tip positive, Ring negative and Sleeve ground.

•When a jack is inserted into the instrument input, a sealed gold contact relay switches the preamplifier input source from the mic input connector to the front panel TRS jack. The input impedance of the instrument input is 1M Ohm, which is ideal for inserting high impedance sources such as guitars with passive pickups as well as any instrument with a high level output. Please note that the gain range of the preamplifier when using the instrument input is –10dB to +40dB.

•Using the instrument input with an unbalanced source is simple if a mono ¼” jack is used since the sleeve will automatically ground the inverting input (ring) when plugged in.

•Output connections are made using the male XLR connector or the ¼” TRS jack. The XLR connector is wired with pin 2 positive, pin 3 negative and pin 1 ground. The ¼” TRS connector is balanced with the Tip positive, Ring negative and Sleeve ground. The XLR and TRS outputs can be used simultaneously. Important- See figures 1. and 2. for unbalanced cable termination information.

•If either of the outputs are to be used unbalanced, a modified cable is required and pin 3 (or the Ring) should be left open. See figure 2. below.

NOTE: It is not recommended to use an unbalanced ¼” plug in the TRS output jack since the sleeve of the unbalanced plug will short the inverting output amplifier to ground. While this will not cause damage to the preamplifier, it can cause distortion in the unbalanced signal.

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Boulder Amplifiers 101 owner manual Connecting the Preamplifier, Audio Connections
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101 specifications

Boulder Amplifiers has established itself as a leader in the premium audio amplifier market, renowned for its commitment to excellence in sound quality and innovative technology. Founded in Boulder, Colorado, the brand’s philosophy revolves around the idea that high-fidelity audio is paramount, and this is meticulously reflected in their amplifiers.

One of the standout features of Boulder Amplifiers is their fully balanced architecture. This design reduces noise and distortion, ensuring that the audio signal remains pure throughout the amplification process. The balanced circuit topology minimizes the impact of external interference, leading to a cleaner, more accurate sound reproduction, which is vital for audiophiles seeking the best listening experience.

Additionally, Boulder amplifiers boast exceptional power output and efficiency. Many of their models are capable of delivering high wattage ratings while maintaining low distortion levels. This means that they can drive even the most demanding speakers without compromising on sound quality. The amplifiers typically feature high current outputs that enable them to handle dynamic musical passages with grace, providing a robust performance across all types of music genres.

Another distinguishing characteristic is the use of premium components. Boulder Amplifiers utilizes meticulously selected capacitors, resistors, and transistors designed for superior performance. This attention to detail not only enhances reliability but also contributes to the amplifiers’ longevity and consistent sound quality over time.

The integration of advanced thermal management systems is also prevalent in Boulder’s designs. These systems ensure that the amplifiers operate under optimal temperature conditions, which is critical to maintaining sound integrity and protecting internal components from overheating.

Boulder’s commitment to craftsmanship is evident, as many of their products are handcrafted to ensure the highest standards of quality. The aesthetic appeal of the amplifiers is equally impressive; their sleek and minimalist designs exude sophistication, making them an attractive addition to any audio setup.

In terms of user experience, Boulder Amplifiers are built with intuitiveness in mind. Many models feature easy-to-read displays and straightforward controls, allowing users to focus on enjoying the music rather than navigating complex settings.

Ultimately, Boulder Amplifiers represent the pinnacle of audio engineering, combining cutting-edge technology with exceptional craftsmanship to deliver an unparalleled listening experience. Whether for a dedicated audiophile or a music lover seeking the best sound, Boulder Amplifiers set a standard in the high-end audio market that continues to inspire.
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