PMC ACTIVE twenty5.21i

StereoNET found the transmission-line bass agile, tuneful and highly articulate, retaining nearly the low-end heft expected from a much larger driver. For a 5.5-inch standmount, reviewers portray its bass foundation as a major strength rather than a compromise.

Vocal reproduction receives particularly emphatic praise: StereoNET calls intelligibility excellent and says the speaker is outstanding at expressing the human voice. Close-miked vocals retain natural warmth without artificial thickening, while instrumental separation remains clear and convincing.

The soft-dome treble is presented as even and well integrated rather than artificially bright or showroom-forward. Reviewers praise the speaker's lucid detail and coherence, although there is less direct commentary on ultimate air and extension.

With modest toe-in and correct positioning, StereoNET reports an immersive, panoramic soundstage with a rock-solid central image. Lead vocals are described as pin-point precise, with backing parts and instruments held clearly in their proper places.

The active configuration's dedicated amplification is credited with improving control, transparency and dynamic expression. Best of High End describes vice-like driver control and a remarkably dynamic sound, while StereoNET also highlights the gains in precision and resolution.

The twenty5.21i uses a distinctive reverse-rake cabinet, a cast-alloy-chassis mid/bass driver, PMC/SEAS soft-dome tweeter and dedicated amplification for each driver. The reviews convey a thoughtfully engineered, professionally oriented design, though they say little about long-term durability or cabinet-resonance testing.

At £3,975 / $5,499, this is a premium compact active speaker, but its built-in amplification can replace separate power amplification and reduce system clutter. Reviewers suggest it could be all the hi-fi many listeners need with a good variable-output source or preamplifier, although they do not directly compare its price with rival active speakers.