Sorry people. It should not be forbidden to be minimally truthful and get real for a brief moment. Historically, PMC have always had very poor price to quality ratio as compared to the their competition. At best, some models have performed satisfactorily and at worst the "PMC lie" is obviously apparent. This is especially true with their newest series.
The PMC lie is primarily about their infamous transmission line implementation. It is flawed, skewered, inaccurate and in perfect contradiction with the theory and calculation of A.R. Bailey, known as the father of transmission line speaker technology from the mid 1960s. For example, PMC's stand mounters (21 and 22) simply do not have enough cabinet volume to properly build a transmission line chamber with the required linear measurements for the selected drivers. The floor standing models indeed have more volume but do not include an internal taper which is part of the recommended and generally accepted design principle. Lastly, the inclusion of the famous "F1 technology" Laminair vent is an absolutely useless gimmick and has literally no audible effect at the tuned frequencies. It is all purely marketing spiel...to fool the prospective customer.
Now, coming to the subject of their latest version of the Twenty5 series known as "i" for improved. PMC have failed miserably with this series. Here's why. The previous generation was typically known as "too hot" and bass shy, even if the restitution of lower frequencies found fans among some listeners. In order to remedy this and improve on weaknesses "they knew all along" (see YouTube video where Oliver Thomas spills the beans)...PMC decided to make 3 changes to the series. Isolation improvements for floorstanders, crossover tuning to 100hz lower, and a new tweeter.
What they have done is to create speakers that suffer from the exact inverse of the weaknesses of the previous version! Now, you have a series that is so "polite and laid back" (PMC's own words) that you're found wanting for more presence, definition, clarity and plain and simple energy in the upper registers. Oh yes, it's very "polite" now!
Worse yet is the bass response. PMC have taken a speaker that did have the ability to be somewhat room-friendly in terms of placement, the front-mounted port (and it is indeed a form of reflex port) allowed for this to some degree, and have tuned the crossover to where the bass response is now overwhelming. All you can hear is bass, bass and more bass. The entire musical message is adversely affected by a booming, ever-present bass response that masks the upper-bass and midrange registers. It is an absolute failure to go from one extreme to another and dare call it "improved". It is shameful and unbecoming of any serious manufacturing company to mock their customers in such a manner.
Lastly, PMC and Naim have typically and historically been known to marry well together and provide synergy where the strengths of one brand complimented weaknesses of the other. THIS IS NO LONGER THE CASE. Naim IS NOT the amplification you want with the 25i series. Naim's energy and drive in the lower frequencies is unfortunately COMPOUNDED by the PMC's new "feature" of grossly exaggerated bass response. PMC has effectively shat on innumerable Naim/PMC owners who may have wanted to upgrade. That being said, I have personally tried Jadis, MF and YBA on a pair of 25.22i speakers and the result is the same; restrained upper frequencies, exploding bass register and zero room friendliness.
You may also note that the only favorable reviews of this series is from retailers and professional reviewers, all of whom have a commercial interest in portraying them in a favorable light. My challenge to you is to listen to them for yourself...and thank me later.