Swedish Analog Technologies XD1

Once in a lifetime opportunity to own the best turntable in the world. Swedish Analog Technologies (SAT) XD1 with CF1 tonearm and some upgrades along the ownership. The best part at my asking price professional setup by an industry veteran and white glove delivery is included

Single owner since new and still in the main system. Total price paid when new 325000$. 

Sale includes
Record Player System + Platter
Cf1 Tonearm
Kuzma 4points Tonearm with added hardware for a second tonearm
 

The isolation system, chassis, and tri-leg structure
The XD1's price includes a custom, low-profile, Minus K–based "negative stiffness" isolation platform—one of two components that constitute the turntable's dual-complementary isolation system (footnote 4).

The Minus K provides a very high level of isolation from 1.5Hz to 100Hz. Multielastomer-based suspension modules, matched to the turntable's mass and built into the XD1's three legs, provide isolation above 100Hz. They can be replaced with modules of different calibration if a heavier platter or tonearm becomes available. The feet also allow for precise platter leveling.

The high-density monoblock chassis, machined from a single piece of a magnesium-aluminum-silicon alloy, also provides isolation. Gomez says that several sharply machined edges along the chassis and leg contours diffract sound waves, reducing their sonic impact. Smaller curved, chamfered surfaces replace the large, flat surfaces found on most turntables.

The three massive legs were designed via Finite Element Analysis simulation and VDoE (Virtual Design of Experiments) technology, which you can learn more about on Google once you scroll past the Virginia Department of Education.

A unique armboard–turntable interface
A "key" type "drop in" system, stiffened with bolts, produces what Gomez claims is a 100% accurate, rigid interface between the two armboard "pods" and the side of the chassis. The design produces repeatably reliable geometry: With an arm and cartridge preinstalled on an extra armboard, you can install it in minutes and be sure of accurate alignment.

A platter matter
The XD1's standard platter weighs 26.5lb; precision-machined from a "precipitation-aged Mg-Si-Al alloy" similar to what's used to produce the chassis. 

From Stereophile
"For now, though, sleep deprivation makes clear that the SAT XD1 with CF1-09Ti is the best-sounding, best-engineered, and best-built turntable that's been here. I'm so glad that I'm still here to experience it!"