PMC ACTIVE Twenty5.21i Bookshelf / Standmount Loudspeakers

£3,975.00 inc. VAT

Trade-in available.

The Active twenty5.21i by PMC is the smallest in the range, but its impact and portrayal of any piece of music is far from small, thanks to the unique PMC ATL bass loading and 2 x 100 Watts of active amplification.

Available in Walnut, Diamond Black and Oak finishes. (Images not yet supplied for Black / Oak).



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ACTIVE Twenty5.21i

Small but mighty – that sums up the PMC Active twenty5.21i – which may be the most compact model in the new Active twenty5i range, but it benefits from the same cutting-edge active amplification as all the other models in the series, combining an active crossover with 100 Watts of power for each driver.

It also benefits from PMC’s Advanced Transmission Line technology, delivering a level of bass impact you would expect from a much larger design.

The Active Twenty5.21i is ideal for small-to-medium listening environments where you still want detailed bass, ultra-realistic mids and delicate highs with maximum musicality. It is equally happy to be mounted on a stand or a bookshelf and is an excellent choice for effects speakers in an immersive sound system.

All models in the PMC Active twenty5i series are an elegantly simple solution for any music lover: add a preamplifier or streamer with a volume control for a complete music system.


The source of PMC’s legendary natural, realistic sound is the Advanced Transmission Line (ATL) bass-loading technology, professionally proven all around the world.

ATL uses energy generated by the bass unit in a much more intelligent, efficient way than speaker designs based on ported or sealed boxes.


  • 2 x 100 Watts of active amplification, built-in.
  • Advanced Transmission Line technology.
  • Can be bookshelf or stand-mounted.
  • Ideal for smaller environments, or as home cinema effects / surround speakers.


  • Available Finishes: Walnut, Diamond Black, Oak.
  • Frequency Response: 46 Hz – 25 kHz
  • Effective ATL Length: 1.72 m
  • Drive Units:
    • HF: PMC/SEAS, 19 mm twenty5i series, SONOMEX™ fabric soft dome, ferrofluid cooled, with 34 mm surround and dispersion grille.
    • LF: PMC 140 mm long-throw g-weave cone with cast alloy chassis.
  • Crossover Frequency: 1.65 kHz.
  • Horizontal Directivity: 100 Degrees.
  • Vertical Directivity: 90 Degrees.
  • Input Connectors: Balanced analogue XLR, unbalanced RCA.
  • Amplifiers: HF 100 W rms, LF 100 W rms.
  • Gain / Sensitivity: 1 V rms = 96.5 dB SPL @ 1 m (low setting) / 106.5 dB SPL @ 1 m (high setting).
  • Input Impedance: >14 kΩ
  • Mains Power: 90-260 V, IEC C14 Connector.
  • Dimensions (H x W x D): H 340 x 162 x 269 mm, including connectors (+ 9 mm grille).
  • Weight: 6 kg each.

Full PMC Range Available

Unilet Sound & Vision are official retail partners for PMC Loudspeakers, providing sales, advice and assistance on their entire range of high-quality products. Please do get in touch if you would like a demonstration or wish to purchase.

More Information

Additional information

Weight 6.0 kg
Dimensions 26.9 × 16.2 × 34.0 cm

Diamond Black, Oak, Walnut

Purchase Options

Home Delivery, Click & Collect, Trade-In Available



The Professional Monitor Company was founded in 1991 by Peter Thomas of the BBC and Adrian Loader of FWO Bauch.

Their combination of knowledge and a life-long passion for music led to the production of PMC’s first product, which was snapped up by BBC Maida Vale Studios and Metropolis Mastering and has remained the world’s reference ever since. PMC are one of the very few companies who have been awarded an Emmy for their contribution to recording excellence., and the company reigns supreme throughout the leading mastering houses, broadcasters and much of the professional world.

PMC believe a good loudspeaker should be able to relay the purest intentions of the artist without colouration – The ideal solution for both studio & home.

PMC | Unilet Sound & Vision


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