Our most advanced turntable. Engineered for uncompromising playback.
- OA3 Pro Tonearm with one-piece magnesium armtube, dial counterweight, and adjustable anti-skate.
- Ortofon 2M Blue.
- Ultra-quiet motor with electronic speed control (33/45 RPM).
- Grooved acrylic platter with precision aluminum spindle and seamless silicone belt.
- Adjustable-height aluminum feet with Sorbothane for vibration isolation.
- Natural hardwood plinth in walnut, ebonized oak, or white oak.
- CNET's Best Turntable Under $1000, TIME's Best Inventions 2023
Seriously detailed playback
Introducing our OA3 Pro Tonearm. One-piece magnesium armtube is light yet rigid for exceptionally low resonance. Upgraded gimbal bearing allows for near-frictionless tonearm movement. Easily adjustable for flawless tracking.
Ultra-quiet motor with electronic speed control
Theory’s motor features a larger rotor and coils that are optimized for smooth running. Advanced motor controller for pinpoint speed accuracy and virtually zero motor noise. Knob for easy speed change (33/45 RPM).
Loaded with upgrades
Sorbothane-damped feet. Grooved acrylic platter. Machined aluminum spindle. Every detail has been thoughtfully designed to elevate your listening experience.
Exclusively on Theory:
- Enhanced tonearm adjustability
Adjustable anti-skate and dial counterweight make it easy to fine-tune performance.
- Upgraded gimbal bearing
OA3 Pro features a high-precision bearing design with all stainless steel components.
- Ultra-quiet motor
Theory’s motor uses heavy-duty magnets to minimize vibration and ensure near silent operation.
- Aluminum spindle and pulley
Machined from aircraft-grade alloy for increased precision and durability.
33% Lighter
10x Damping capacitycompared to aluminum
Our OA3 armtube is molded from magnesium – an incredibly strong yet lightweight material known for its vibration damping properties. Each armtube is made in the USA to exacting standards.
One-piece tapered design minimizes points of resonance in the tonearm. This ensures no musical information from the record is lost, so you hear every detail with remarkable clarity.
Easily adjustable for flawless tracking
Fine tune your tonearm to optimize cartridge performance. OA3 Pro’s dial counterweight allows you to set tracking force without a stylus gauge. And its adjustable anti-skate uses a hinged weight to apply consistent force across the entire record surface.
Precision engineered from the inside out
OA3 Pro’s upgraded gimbal bearing allows the tonearm to move with exceptional freedom. Both the bearing shaft and housing are machined from stainless steel and threaded for highly precise axial preload. This means less resonance in the tonearm and near-frictionless movement across the record.
Pinpoint speed accuracy
Theory features a DC-powered sine wave generator system that monitors and adjusts speed thousands of times per second. Our advanced motor controller utilizes a crystal oscillator to drive the ultra-quiet motor with pinpoint accuracy. The result? Minimal wow & flutter and no motor noise during playback.
Orbit’s new groove
Our frosted acrylic platter is grooved to keep the belt in place. All platter surfaces are precision machined for ultimate flatness and virtually zero runout. The platter rotates on a machined aluminum spindle and inverted main bearing with self-lubricating polymer bushings.
Less vibration. More clarity.
Theory’s adjustable Iso-Level Feet are constructed out of aluminum and layered with Sorbothane – the gold standard for vibration isolation. Preventing vibrations from reaching the stylus lets you hear the most subtle details of your music with outstanding clarity.
Plug and play
Optional built-in phono preamp lets you connect to your favorite components. Featuring Pluto 2 technology with low-noise circuitry and high quality components like WIMA film capacitors and precision resistors.
Specs:
| Playback speeds | 33/45 RPM electronically changed |
|---|---|
| Dimensions | 16.75 x 12.5 x 4.25" |
| Wow & flutter | < 0.1% |
| Nominal speed | +/- 0.5% |
| S/N Ratio | - 79 dBA |
| Rumble | < -72 dBA |
| Tonearm effective length | 220 mm |
| Tonearm effective mass | 8 g |
| Overhang | 19 mm |
| Input voltage | 115V/60Hz |
| Output connection | RCA |
PRODUCT INFORMATION:
Model: R405WNAOBU | Barcode:
WARNING: California Residents - Proposition 65. This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov