Предусилители — Circle Labs Audio P300

The P300 is a preamplifier from Circle Labs Audio, built with an exceptionally wide rated bandwidth. Circle Labs Audio is a comparatively specialist manufacturer, and this preamplifier's extreme measured bandwidth figure suggests an engineering team with ambitions toward the reference-tier end of the preamplifier category.

Key specs that matter

Two balanced and three single-ended inputs are provided, with two balanced outputs. Input impedance is 66 kOhm balanced and 33 kOhm single-ended, an easy load for any source regardless of its own output impedance. Output impedance is 15 ohms, an exceptionally low figure well suited to driving a demanding power amplifier input or a long cable run without measurable signal degradation. Rated bandwidth is an extraordinary 2 Hz to 500 kHz, a figure that extends far beyond what any source material could contain, reflecting a design philosophy that prioritises engineering margin well past the audible range. At 430 x 342 x 127 mm and 10.6 kg it is a substantial chassis, consistent with a serious power supply behind the wide-bandwidth circuit design.

Sound and use context

Expect a wide-bandwidth, low-output-impedance presentation suited to driving long cable runs or a demanding power amplifier input cleanly - this specification profile suggests a preamplifier built for a serious, no-compromise two-channel system.

Pairing

The two balanced outputs work naturally with a balanced power amplifier; the low 15 ohm output impedance suits long cable runs without concern for high-frequency roll-off.

Alternatives

Circle Labs Audio's broader electronics range offers matching partner components from the same brand, worth researching directly given the brand's relatively specialist market position compared with more widely established manufacturers. Circle Labs Audio relatively low profile within the broader hi-fi market means prospective buyers should budget extra time for research and, where possible, an in-person demonstration before committing to a purchase at this level, since long-term ownership reports remain comparatively scarce for the brand compared with more established manufacturers. A direct comparison against a more established reference preamplifier, where a dealer can arrange one, remains the most reliable way to judge whether this model genuine measured performance translates into an audible advantage.