From our website: https://metavoxaudio.com/products/fact-fenestriaThese speakers are giant killers even at their retail price of $75,000/pair. It is very hard to beat this anywhere close to its price let alone the price offered here.Some highlighted quotes from a small subset of reviews out there below, followed by tecnical descriptionThe PMC Fact Fenestrias are without doubt one of the finest speakers we’ve heard....Overall, it’s hard to come to any other conclusion than that these speakers richly deserve a prominent position amongst the very best speakers we’ve ever tested. There’s no higher compliment than that.https://www.whathifi.com/reviews/pmc-fact-fenestriaThe fact fenestria, PMC’s flagship loudspeaker, makes this point very clear by virtue of having so little distortion and tonal colouration of its own. It is the most transparent and even-handed loudspeaker I have used in over thirty years of reviewing.https://the-ear.net/review-hardware/pmc-fact-fenestria-floorstanding-loudspeakers/The PMC fact fenestria is a remarkable achievement.. few of them can compete with the sheer transparency to the signal that the fact fenestrias offer, it will be a long time before I come to terms with real world loudspeakers when they are gone.https://hifiplus.com/articles/pmc-fact-fenestria-floorstanding-loudspeaker/PMC’s Fact Fenestria is one of the most gratifying and sonically involving speakers I have reviewed. It’s a complicated design, but PMC’s seamless integration of quality components and innovative technologies has enabled the Fenestria to “disappear” from the room -- and the music -- by functioning better in the room than any other speaker I’ve reviewed. Obviously, PMC is on to something -- I hope to see some of the technical savvy incorporated into the Fact Fenestria trickled down to other, less costly PMC models, because it really, really works. My highest recommendation.https://www.soundstageultra.com/index.php/equipment-menu/914-pmc-fact-fenestria-loudspeakersTECHNICAL SUMMARY-----------------------------------Drivers:Tweeter:The tweeter in the PMC Fact Fenestria is a 19.5mm Sonomex dome tweeter with an unusually large 36mm wide surround. The tweeter uses a powerful Neodymium magnet assembly and is mounted in a machined aluminium housing. The tweeter is decoupled from the cabinet by a silicon mount, which helps to reduce resonance and improve sound quality.The tweeter has a frequency response of 3.8kHz - 25kHz and a sensitivity of 91dB/W/m. It is made from a Sonomex dome, which is a type of synthetic material that is known for its lightness and stiffness. The tweeter has a wide frequency response and is capable of reproducing high frequencies with great clarity and detail.Midrange:The midrange in the PMC Fact Fenestria is a 75mm dome midrange with a rear chamber to absorb any unwanted sound coming off the back of the diaphragm. The midrange is mounted on a machined aluminium housing and is decoupled from the cabinet by a silicon mount.The midrange has a frequency response of 100Hz - 3.8kHz and a sensitivity of 88dB/W/m. It is made from a Kevlar/carbon fiber composite, which is a lightweight and rigid material that is known for its neutrality and accuracy. The midrange has a wide frequency response and is capable of reproducing midrange frequencies with great clarity and detail.Woofers:The woofers in the PMC Fact Fenestria are two 6.5 piston drivers. Each cone is a diaphragm comprising two skins of triple transverse-weave carbon fiber sandwiching a core of multicellular Rohacell foam. The woofers are mounted in a transmission line bass system, which helps to produce deep, accurate bass response with minimal cabinet vibration.The woofers have a frequency response of 25Hz - 100Hz and a sensitivity of 88dB/W/m. They are made from a carbon fiber/Kevlar composite, which is a lightweight and rigid material that is known for its neutrality and accuracy. The woofers have a wide frequency response and are capable of reproducing bass frequencies with great clarity and detail.----------Crossover Mechanism and Slopes:The crossover in the PMC Fact Fenestria is a 3-way design with a 24dB/octave slope. The crossover is designed to ensure that the different drivers are working in their optimal ranges and that they are seamlessly blended together.The crossover is made from high-quality components and is designed to be as transparent as possible. The crossover is located in a separate chamber inside the speaker cabinet, which helps to reduce interference from the drivers.-------Transmission Line:The transmission line in the PMC Fact Fenestria is a long, narrow port that is located in the rear of the speaker cabinet. The transmission line helps to produce deep, accurate bass response by gradually releasing the sound from the woofers into the room.The transmission line is made from a high-quality material that is designed to minimize turbulence and distortion. The transmission line is also tuned to the specific frequency response of the woofers, which helps to ensure that they are working in their optimal ranges.Overall, the PMC Fact Fenestria speakers use a combination of high-quality drivers, a sophisticated crossover, and a unique transmission line design to produce a high level of sound quality. The speakers are well-suited for a variety of music genres and are sure to please even the most discerning audiophile.--------Vibration Removal:Planar Wings:The planar wings are a unique feature of the PMC Fact Fenestria speakers. They are four curved side panels that are elastically connected to the housings of the woofer units. The wings vibrate in opposition to the woofers, which helps to cancel out unwanted vibrations and improve sound quality.The planar wings use a technology called tuned mass dampers. Tuned mass dampers are devices that are used to reduce vibration. They work by having a mass that is attached to a spring. The mass vibrates in opposition to the vibration of the object that it is attached to. This cancels out the vibration and improves the stability of the object.The planar wings on the PMC Fact Fenestria speakers work in a similar way. They are attached to the woofer units by springs. When the woofer units vibrate, the planar wings vibrate in opposition. This cancels out the vibration of the woofer units and improves sound quality.The planar wings are an effective way to reduce vibration in speakers. They are used in a number of high-end speakers, and they have been shown to improve sound quality.Floating Baffle:The PMC Fenestria speakers use a floating baffle to isolate the tweeter and midrange drivers from the cabinet. The floating baffle is made from a thin piece of aluminum, and it is attached to the cabinet by four silicon mounts. The silicon mounts are designed to allow the baffle to move freely, which helps to isolate the drivers from the cabinet.The floating baffle in the PMC Fenestria speakers helps to reduce cabinet vibration, which can improve sound quality. This is because cabinet vibration can cause the sound waves to be distorted. The floating baffle helps to absorb the energy from the drivers before it can cause the cabinet to vibrate, which helps to reduce cabinet vibration and improve sound quality.The floating baffle in the PMC Fenestria speakers is also designed to reduce coloration. Coloration is the introduction of unwanted frequencies into the sound. The floating baffle helps to isolate the drivers from the cabinet, which prevents the cabinet from affecting the sound. This can help to reduce coloration and improve the overall sound quality of the speakers.The floating baffle in the PMC Fenestria speakers can also help to improve imaging. Imaging is the ability to hear the location of instruments and vocals in the soundstage. The floating baffle helps to reduce cabinet vibration, which can cause the soundstage to be blurred. This can help to improve imaging and make it easier to hear the location of instruments and vocals in the music.Overall, the floating baffle in the PMC Fenestria speakers is a useful technique that can help to improve sound quality, reduce coloration, and improve imaging.Here are some additional details about the floating baffle implementation in the PMC Fenestria speakers:The floating baffle is made from a thin piece of aluminum that is less dense than the cabinet. This helps to reduce the amount of energy that is transferred from the drivers to the cabinet.The silicon mounts are designed to allow the baffle to move freely. This helps to prevent the baffle from resonating, which can cause the sound to be distorted.The floating baffle is located in the front of the speaker cabinet. This is because the drivers that produce the highest frequencies are most sensitive to cabinet vibration.The floating baffle is a relatively simple technique, but it can be very effective in improving sound quality. It is a common feature in high-end speakers, and it is becoming increasingly popular in more affordable speakers.