Audio Research
Audio Research Reference 330M Monoblock Power Amplifier
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Audio Research Reference 330M Monoblock Power Amplifier
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Overview
Audio Research Reference 330M Monoblock Power Amplifier
MAKE MUSIC COME ALIVE
The Audio Research Reference 330M is a statement-level monoblock power amplifier engineered to bring the listener closer to the reality of a live performance.
With 330 watts of all-tube power, the Reference 330M combines extraordinary control and dynamic authority with the delicacy, purity, and tonal richness that define the finest vacuum-tube amplification.
Hand-built and representing more than five decades of Audio Research experience, the 330M is designed to command virtually any loudspeaker while preserving the emotion, texture, and spatial character of the recording.
A HAND-BUILT MASTERPIECE
| ALL-TUBE SIGNAL PATH | EXCEPTIONAL CONTROL |
|---|---|
| From its ECC83 input stage through its KT170 output tubes, the 330M uses an all-tube signal path for natural, expressive musical reproduction. | 330 watts of output provide the authority and grip required to control demanding, statement-level loudspeakers. |
| TUBE REGULATION | DYNAMIC EXPRESSION |
| Tube regulation in the power supply contributes to the amplifier's characteristic purity and musical ease. | High-power performance is combined with delicacy, tonal density, and startling dynamic life. |
The Reference 330M is the culmination of Audio Research's experience, combining new technology and circuit development with the company's established vacuum-tube architecture.
POWER WITHOUT COMPROMISE
The 330M is designed to deliver the ease and authority of high power without sacrificing the finesse normally associated with lower-powered tube amplifiers.
Its presentation combines:
TONAL SATURATION • DENSITY • LIQUIDITY • PRECISION • DYNAMIC LIFE
Extension at both ends of the frequency spectrum is designed to reproduce the full scale of modern recordings, including the deepest bass from capable loudspeakers.
ENGINEERED FOR WORRY-FREE PERFORMANCE
| AUTO-BIAS | LONG TUBE LIFE |
| Automatic bias maintains consistent operating performance minute after minute and day after day. | Audio Research specifies approximately 3,000 hours of output-tube life. |
| REMOTE CONTROL | SYSTEM INTEGRATION |
| 12V triggers and RS-232 control provide convenient system integration. | Fully balanced inputs plus single-ended inputs allow compatibility with a wide range of source components and preamplifiers. |
The 330M also incorporates automatic power-saving functionality, fan-speed control, a tube-hour meter, tube monitoring, and selectable meter lighting and meter action.
REFERENCE-LEVEL FEATURES
| 330 WATTS | AUTO-BIAS |
| High-power monoblock amplification. | Automatic tube biasing for consistent operation. |
| 4Ω / 8Ω OUTPUTS | BALANCED + SINGLE-ENDED |
| Dedicated 4-ohm and 8-ohm speaker output taps. | XLR and single-ended inputs. |
| 12V TRIGGER | RS-232 |
| Remote system power control. | Advanced system control and integration. |
TUBE COMPLEMENT
The Reference 330M employs a carefully selected tube complement built around its high-power, all-tube architecture.
| FUNCTION | TUBES |
| Power Output | 6 × KT170 |
| Input | 1 × ECC83 + 1 × 6H30 |
| Power Supply | 1 × 6550 + 1 × 6H30 |
TECHNICAL SPECIFICATIONS
| SPECIFICATION | REFERENCE 330M |
| Type | Monoblock Power Amplifier |
| Power Output | 330 watts |
| Tube Biasing | Auto-Bias |
| Output Taps | 4Ω / 8Ω |
| Output Tubes | 6 × KT170 |
| Input Tubes | 1 × ECC83, 1 × 6H30 |
| Power Supply Tubes | 1 × 6550, 1 × 6H30 |
| Inputs | XLR & Single-Ended |
| Controls | 12V Triggers, RS-232 Remote Control |
| Power Saving | Standby Mode |
| Weight | 101 lb |
THE POWER OF THE REFERENCE
The Reference 330M brings together the scale and authority of a high-power amplifier with the tonal sophistication and expressive freedom of an all-tube design.
For systems built around truly reference-level loudspeakers, it offers an uncompromising foundation—330 watts of controlled, dynamic, richly textured musical power.
AUDIO RESEARCH REFERENCE 330M
Power. Purity. Presence. The performance, fully realized.
FAQs
Please read our FAQs page to find out more.
Do you price match?
Yes. We match any authorised dealer, including big-box retailers. If you find the same product at a lower price, contact us and we'll match it.
Do you offer free shipping?
Yes — free shipping on every order, with 2-day delivery available on most products. Easy returns and exchanges are included.
Where is your showroom?
We're at 6362 Alder Drive, Houston, Texas. The showroom lets you hear and compare reference-level systems in person before making any decisions. If you're considering a larger purchase or installation, it's well worth the visit.
Can I buy online without visiting the showroom?
Yes. The full product range is available through the online store with free nationwide shipping. For more complex system builds, speaking with one of our advisers first tends to lead to a better result.
Do you offer financing?
Yes. Special financing is available through the BrandSource Credit Card for qualifying purchases, allowing you to spread payments over time with no annual fee. Promotional rebate savings are also available periodically. See the financing page for full details.
Do you install systems as well as sell equipment?
Yes — installation is central to what we do. We design and install whole-home audio and video, home theaters, media rooms, outdoor audio, lighting and motorised shades, and full smart home automation.
Do you provide support after installation?
Yes. We provide ongoing service and support to ensure systems continue performing as intended — not just on installation day, but over the long term.