These PMC Advanced Transmission Line bookshelf speakers are in excellent condition and sound absolutely amazing for their size! Fantastic soundstage where you can really reach in to the sound and hear details that are normally masked by less expensive makes and models. Terrific imaging and the bass extension is quite extraordinary for the cabinet dimensions thanks to the ATL transmission line and aerodynamic vent design. Neutral sound reproduction worthy of PMCs pedigree of ex-BBC engineers... and such a fast response that I can honestly say I have never heard such exquisite detail in acoustic guitars and harpsichords before! Finished in lovely warm Amarone wood veneers. Same tweeter as used in much more expensive twenty5.22, 23 and 24 and the same bass driver as in the twenty5.23! Vent on the front allows placement near walls without major changes to the bass response. Benefits slightly from being near - but ideally not up against - a wall. The twenty5.21 offers maximum flexibility for placement, and also makes an excellent choice for effects speakers in an immersive sound system. PMC say: The twenty5.21 is proof that great things come in small packages. Don’t let its compact size fool you; this loudspeaker is nothing less than remarkable. Its complex ATL and Laminair vent mean that you get speed, weight and transparency, with the greatest bass extension of any loudspeaker this size. Whether on a shelf or its performance-enhancing stand, the twenty5.21 excels with all types of music. Its articulate mid-range, clear, open highs and profound bass mean it can fill rooms both medium and small with astonishing ease. This pair recently bought recently from an authorised dealer and barely used... I thought I had peace at last!... but selling now due to an unexpected upgrade. Only used in smoke-free surroundings. Cosmetically excellent with just a minor ding in the wood veneer above the vent (below the driver, and near the PMC badge) on the left speaker (see close-up photo) and very slight indent on the left side edge of the right speaker (see photo). Pair comes with instruction manual and cleaning cloth (but not the grilles normally supplied.) Still in original box and packaging, and will be sent by ParcelForce 48 or buyer may collect from TQ1 area (Torquay, Devon). *** (PLEASE NOTE: Studio will be closed for holidays from July 4th to July 16th, so speakers cannot be sent or collected during that period.) Specifications:Crossover Frequency:1.8kHzDimensions:H 340mm (13.4”) x W 162mm (6.4”) x D 284mm (11.2”) - Incl. binding postsDrive Units: LF - PMC twenty5 series 5.5”/140mm long-throw g-weave™ cone with cast alloy chassisHF - PMC/SEAS®, 27mm twenty5 series, SONOLEX™ fabric soft dome, Ferrofluid cooledEffective ATL™ Length:1.72m 5.6ftFrequency Response:46Hz - 25kHzImpedance:8 OhmsInput Connectors:One pair 4mm binding postsSensitivity:86.5dB 1W 1mRecommended Amp Power: 30 - 150W Extracts from HiFi Choice Magazine Review:“…the bass response is simply extraordinary considering its fairly modest dimensions… there is a sweetness to the midrange and upper registers that I’ve previously only really experienced on rather more expensive PMC models that benefit from the bespoke dome midrange driver that the company uses… The twenty5.21 also has an unapologetic sense of joy when required… there are no limits to the different types of music that it is happy handling. It also manages to respond positively to good recordings and hi-res material while avoiding showing up too many of the failings of poorer feeds. It is completely happy running through a Spotify playlist and only seriously compressed internet radio stations will provoke it into sounding a little thin and scratchy. ConclusionThe result is a speaker that has a refinement and control that takes this newest member of the family beyond what we have seen relatively affordable models achieve in the past. This is a seriously talented speaker that has to be on everybody’s shortlist at the price.”ES, 2017