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PMC ACTIVE twenty5.21i
The Active twenty5.21i is the smallest in the range, but its impact and portrayal of any piece of music is far from small, thanks to PMC’s ATL bass loading and 2x100W active amplification.
Small but mighty – that’s the Active twenty5.21i: it may be the most compact model in the new Active twenty5i range, but it benefits from the same cutting-edge active amplification as the other models in the line-up, combining an active crossover with 100W of power for each driver. It also benefits from PMC’s Advanced Transmission Line technology, delivering bass impact you’d expect from a much larger design. It is ideal for small-to-medium listening environments where you still want detailed bass, ultra-realistic mids and delicate highs with maximum musicality. It’s equally happy to be mounted on a stand or a bookshelf and is an excellent choice for effects speakers in an immersive sound system.
The Active twenty5i series is an elegantly simple solution for any music lover: add a preamplifier or streamer with a volume control for a complete music system.
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With studio-grade clarity and a surprisingly deep, tuneful bass, the ACTIVE twenty5.21i pairs precise imaging with exceptional vocal intelligibility and a wide, coherent soundstage. Its matched 100W amplifiers deliver tight control and dynamic authority via native active amplification, making these compact standmounters feel far larger than their footprint while staying refined and non-fatiguing.
Pros
- Deep, tuneful bass and controlled low‑end extension for a compact standmounter, driven by PMC's ATL and long‑throw LF driver.
- Clear, natural midrange with outstanding vocal intelligibility—voices retain body and clarity without added midrange colour.
- Wide, well‑focused soundstage and precise imaging when positioned with modest toe‑in, delivering strong instrument placement and a solid centre image.
- Integrated, model‑matched 100W amplifiers per driver provide tight driver control and notable dynamic authority for the form factor.
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Cons
- No onboard level control—requires a source or preamp with volume control.
- Rear metal plate (amp heatsink) runs hot during extended use.
- Premium pricing—excellent performance and finish but not positioned as a budget option.
Sound Quality
90/100
Bass
90/100
PMC's 140mm (5.5") LF driver with ATL transmission line yields deep, controlled low end for its size; reviewers repeatedly praise the tuneful, articulate bass and low-end heft that belies the small cabinet. The transmission-line design and long-throw driver plus dedicated 100W LF amplification deliver exceptional extension and control "for its size," pushing this into the top band for small stand-mounters.
Mid
92/100
Reviews highlight outstanding vocal intelligibility, natural timbre and lack of midrange colour; instruments and close-miked vocals retain body and clarity. The coherent integration from the bespoke analogue crossover and driver/amplifier pairing supports accurate, lifelike midrange performance.
Treble
86/100
The 19mm Sonomex soft-dome tweeter is described as even and non-bright, offering refinement and lack of sibilance rather than a forward top end. Reviewers note a restrained, well-tempered treble that avoids the artificially 'well-lit' dealer-room brightness of some small monitors.
Soundstage Imaging
90/100
When positioned with modest toe-in the pair projects an immersive, panoramic soundstage with a rock-solid central image and precise instrument placement. Multiple reviewers remark on the wide stereo spread and image focus, giving excellent spatial performance for the form factor.
Dynamics
91/100
Dedicated 100W Class AB amplifiers per driver and tight driver control produce punchy micro- and macro-dynamics; reviewers used phrases like a 'vice-like grip' and improved transparency. The active design yields notable dynamic authority and responsiveness for a compact speaker.
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Build Quality
89/100
Quality finishes (walnut/oak/black), cast-alloy chassis for the 140mm driver and a ferrofluid-cooled Sonomex tweeter reflect high-grade construction. The reverse-rake rhomboid cabinet and professional-grade components (analogue crossover, solid amp modules) support a premium, well-engineered build.
Features Connectivity
88/100
Fully active with dedicated 100W amps per driver, balanced XLR and unbalanced RCA inputs are provided; the speakers require a source with volume control (no onboard level pot). The rear metal plate/heat-sink and analogue crossover show thoughtful implementation, though there's no built-in DSP or app control.
Value for Money
86/100
At MSRP around USD $5,499 / GBP £3,975 reviewers still call it potentially 'all the hi-fi you ever need' and praise the convenience of integrated amplification versus separate components. Premium pricing is balanced by high performance, finish and convenience, making it a strong—but not bargain—value in its class.
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