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Furman AR-20 Series II Voltage Regulator

Furman AR-20 Series II Voltage Regulator

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Page last updated Dec 03, 2025

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Description

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When you're on stage or in the studio, the last thing you need is unreliable power disrupting your performance. Enter the Furman AR-20 Series II Voltage Regulator, a powerhouse designed to keep your electronic gear safe from AC line voltage irregularities like sags, brownouts, and over-voltages. With its 20-amp capacity, this voltage regulator ensures your equipment consistently receives a stable 120V output, even when input voltages fluctuate between 97V and 141V. If voltages stray too far from this range, the AR-20 Series II will automatically shut down to prevent damage, making it a reliable safeguard for all your sensitive electronics.

The AR-20 Series II is more than just a voltage regulator; it's a comprehensive power solution. Thanks to Furman's proprietary Series Multi-Stage Protection Plus (SMP+), it offers unrivaled surge suppression and noise filtration. This ensures that your audio and video equipment perform at their peak without the risk of interference or damage. It employs Linear Filtering Technology (LiFT) to eliminate AC line noise, maintaining the clarity and integrity of your sound and visuals. With 14 AC outlets, including two front-panel convenience outlets and two bi-directionally filtered banks, the AR-20 Series II is equipped to handle both digital and analog components with ease.

Key Features:

Precise voltage regulation delivers a stable 120V output
Series Multi-Stage Protection Plus (SMP+) for advanced surge protection
Linear Filtering Technology (LiFT) for noise-free AC power
Automatic Extreme Voltage Shutdown for safety during over-voltages
20-amp capacity with 14 outlets, including bi-directional filtering for analog and digital components

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Furman AR-20 Series II Voltage Regulator.

Features and functionality

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The Furman P-1800 AR includes an active voltage regulator that maintains 110v (120v) power even if the incoming power drops below a certain threshold.
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An owner mentions the Furman Elite 20i's capacity to handle power amps and subs without perceivable sonic degradation, contrary to typical advice against using conditioners for power amps.
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The Zero Surge 8-outlet model utilizes series mode suppression to divert surge current back to the transformer, protecting grounded equipment without frying it.
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User experience

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One user reports using the Furman P-2400 AR for ten years without equipment loss following lightning-related failures, highlighting its reliability over time.
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Comparisons

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The Furman SPR-20i is noted for its ability to regulate voltage to within 1v of 120v, unlike PS Audio regenerators, which were deemed failure-prone by one user.
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Use cases and applications

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A user with vintage gear finds the Furman SPR-20i essential for maintaining stable voltage between 110-115v due to fluctuating home power.
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