VPI JMW-10 3D Reference Tonearm

The JMW-10 3D Reference — A Printed Armwand With No Joints in It

A 10-inch unipivot tonearm built around a 3D-printed armwand of non-resonant epoxy. The wand is a single piece, from the headshell to the bearing housing, with the internal cable run and a 160-gram counterweight.

The reason to print an armwand is that a conventional one is assembled. Every joint between headshell, tube and bearing is a place energy collects and returns to the cartridge. A printed wand has no joints to store it.

Design and Engineering

The Unipivot, and Where the Weight Sits

The arm balances on a single point, which all but eliminates bearing friction. VPI's own manual draws out what makes this one different: “Unlike other unipivot arms, the JMW-3D lateral balance weight does not hang off to the side of the arm.”

Instead it sits around the bottom of the upper bearing housing. VPI's account of the effect is direct — “This increases mass below the pivot and increases arm stability.” A unipivot with its mass low behind the pivot point is a good deal less inclined to rock.

Anti-Skating, and VPI's View of It

VPI's manual is unusually blunt here: “THE JMW-3D ARM NEEDS VERY LITTLE ANTI-SKATING FORCE IF ANY AT ALL.” The company says it reached that after two decades of listening tests on its own arms. Whatever you conclude, start from the manual rather than from habit.

Azimuth is set by the lateral balance weight, using a thin rod that lies behind the cartridge screws as a visual guide. VTA is set at a tower with thumbscrews, adjustable while a record plays. The arm ends in a Lemo connector.

Geometry and Fit

The Numbers

Pivot to spindle is 258 mm and effective length 273.4 mm, giving 15.4 mm of overhang at an offset angle of 19.98°. VPI quotes average RMS distortion of 0.31%. Those figures are shared across VPI's 10-inch arms, so an armboard drilled for one of them is drilled for this.

Fitting turns on that 258 mm. The JMW-10 mounting is VPI's own, so on a VPI turntable it drops into the existing base, and on anything else it needs an armboard drilled and cut for the job.

Who Is the JMW-10 3D Reference Best For?

• You own a VPI turntable — the 258 mm geometry and the base mounting are already right
• You want a one-piece armwand — printed epoxy, with no joints between headshell and bearing
• You adjust VTA by ear — the tower's thumbscrews are made to be turned while a record plays
• You run more than one cartridge — VPI's design lets an armwand come off the base and another go on
• You would rather not balance an arm on a point — a unipivot needs a level turntable and patient setup; gimbal arms are in tonearms

How Do You Install It?

Set the base 258 mm from the spindle, hang the wand on the pivot and connect the Lemo. Mount the cartridge, then use VPI's supplied alignment jig — it locates against the bearing well and over the spindle — to set overhang. Balance the arm, set tracking force, then azimuth with the rod as a guide. Level the turntable first.

Pairs Well With

What most VPI owners fit alongside a new arm.

• Phono cartridges — the arm sets the range of cartridge that will work
• Cartridge alignment tools — for setting the cartridge up once the arm is mounted
• Stylus force gauges — set tracking force once the arm is back in service
• Tonearm lifters — so the arm leaves the run-out groove on its own

Frequently Asked Questions

Will it fit my turntable?

It needs 258 mm from spindle to pivot and a base cut for the VPI JMW mounting. VPI decks are built for it; another make needs an armboard made for the arm.

How much anti-skating should I apply?

VPI's manual says the arm needs very little if any, and explains that the conclusion came from its own listening tests. Follow the manual supplied with your arm rather than a general rule.

How is azimuth set?

With the lateral balance weight, which sits below the pivot rather than off to one side. VPI supplies a thin rod to lay behind the cartridge screws as a visual reference.

Can I adjust VTA while playing?

The tower uses thumbscrews rather than set screws, which VPI changed specifically to make vertical tracking angle easier to adjust. Loosen both before moving it.

Does the turntable need to be level?

A unipivot finds its own vertical, so yes — VPI's manual makes the point that leveling matters particularly with this kind of arm.

Why Audio Advisor?

• 40+ Years of Expertise — Since 1981, we've helped over a million music lovers find the right gear.
• 60-Day Money-Back Guarantee — Take your time. Listen, enjoy, and make sure it's right for you.
• Real Experts, Real Help — Our team is here to answer your questions at 800-942-0220, weekdays 9am–6pm EST.
• Free Shipping — On orders over $49, delivered to your door.
• Flexible Payment Options — Financing available so you can start listening now.

Learn More

Want to learn more about turntable setup, record care, or getting the most from your vinyl? Visit our Learning Center for guides, tips, and expert advice.