Furman Ref. Voltage Regulator 20A-SPR-20I

Category : Power Conditioners


Furman SPR-20I
Clean and condition your AC power, protect equipment from over voltage, and provide a constant, ultra-stable 120 VAC supply to voltage starved amplifiers.

For over 40 years, Furman has pioneered the development of AC power products for the most demanding audio, video, and broadcast professionals. Though the need for stable AC power is nothing new, the SPR-20i's technology and its unique implementation are revolutionary.

The extreme AC demands encountered in the professional audio/video arena have required technological developments far in excess of typical home theater/audiophile power products. In studios, live sound and broadcast facilities' breakdown can be unacceptable. Equipment failure or poor performance is costly. The same is true of today's home theater. Our solution based technology, extensive engineering expertise, and robust build quality have answered the challenge of today's corrupted power lines, and led to the creation of the SPR-20i.

With today's chaotic demands on many municipal power facilities, AC voltage is often reduced so that it can be stretched to fulfill excess demand. This creates a substantial negative impact on your system's performance. Power amplifiers and powered sub-woofers cannot perform to their full potential. Even a relatively modest reduction in AC voltage can obliterate the sonic impact of an otherwise superior system. Just as problematic are excessively high line voltages. Excess voltage can overheat sensitive circuits; lower the life and reliability of projector lamps, and cause many circuits to shut down. With the SPR-20i's exclusive Stable Power AC Voltage Regulation Technology, voltage-starved power amplifiers and powered sub-woofers perform at their full potential. With the SPR-20i, home theaters are supplied with constant, virtually unwavering AC voltage. This assures trouble-free service for any environment suffering from unstable power.

The SPR-20i generates virtually no heat, and produces none of the mechanical noise typically found in inferior AC voltage regulators. Further, our zero-crossing solid state technology provides virtually unlimited peak current delivery, avoiding the current limiting found in AC regulators that convert AC power into DC, then synthesizing an AC output signal.

In addition to unstable voltage, today's AC lines are plagued with RF and EMI noise. When connecting sensitive equipment to your home's power outlet, AC noise couples into your system's critical components. This AC noise masks low level signals and cripples performance. This low level content is critical because it relays the crucial harmonics and ambience in audio, as well as the depth and clarity in video. With Furman's exclusive Linear Filtering Technology, televisions, projectors, DVD players, and processors are fed by linearly-filtered AC power. This dramatically reduces noise, ensuring consistent peak operation of your critical components regardless of load conditions or the time of the day.

Another critical feature is our exclusive Series Multi-Stage Protection. This virtually maintenance-free surge suppression assures the highest level of AC protection possible, without sacrificing itself when the offending surge is severe. No damaged equipment, no service calls, no down time. Further, our digital AC input voltage, output voltage, and current meters allow precise measurements of both the AC line and the current load. These meters are valuable assets when monitoring systems that are connected to today’s potentially poor power grids.

When employing the SPR-20i, you will notice far clearer, stunningly focused sound and visual images from your system. Video presentation will be crisp and colors true with greater gray and black scale definition, as well as noticeably improved depth and clarity. When installed with the IT-Reference 15i or 20i, home theaters will reap the dual benefits of Furman's Stable Power and Discrete Symmetrical AC Filtering, ensuring performance without compromise — without peer.

Furman SPR-20I  Features at a Glance

  • Provides an ultra-stable 120 VAC supply from low or high voltage sources
  • Linear Filtering Technology (LiFT) for unequaled audio / video clarity
  • Series Multi-Stage Protection (SMP) featuring Extreme Voltage Shutdown (EVS)
  • Cool running, noise free technology allows placement in critical listening environment  
  • Detachable surge suppression module for telco and cable / satellite connectors
  • 20 amp RMS capacity

Other Specifications

  • AC Current CapacityInput - 20 Amp capacity required
  • Output - 20 Amps RMS (19 Amps continuous @ 113VAC)
  • AC Voltage RegulationProvides AC regulation for a continuous output of 120VAC (+/- 1.0V typically) with an input voltage range of 113VAC to126VAC. (The SPR-20i will regulate well beyond 113VAC to 126, but not within 1.0VAC)
  • Linear Noise AttenuationTransverse (Differential) Mode>40 dB from 10Khz. - 100 kHz.
  • >80 dB from 100Khz. – 1GHz.
  • (Linear attenuation curve from 0.05 – 100 ohms line impedance)
  • Outlets4 (linearly filtered outlet – rear panel)
  • 8 (linearly filtered outlet with additional ultrasonic filtering for digital or video components)
  • Dimensions4" H x 17" W x 15.625" D (Standard 2 RU height without feet)
  • Transient Voltage Surge Suppression120 VACSeries Multi-Stage Protection - Non-sacrificial with zero ground contamination
  • 188V peak clamping voltage @ 6000V 3000A input
  • Telco Cable / SatelliteLess than .1dB line loss
  • Shutdown Range140 VAC +/- 3 VAC
  • Weight31 lbs.
  • Power Consumption12 Watts for display and control circuits independent of actual load
  • Safety Agency ListingETL / C-ETL (Pending) 
Line Voltage120 (Volts)
BlueBOLT EnabledNo
Power Factor TechnologyNo
Number of Outlets12
Number of Isolated Banks3
Outlet Descriptions4 (linearly filtered outlet – rear panel) 8 (linearly filtered outlet with additional ultrasonic filtering for digital or video components)
Rack MountableYes
Rack Ears IncludedYes
Front Panel Meter(s)LED voltmeter/ammeter displays incoming voltage and output current draw
Front Media Light(s)No
ControlOn/Off switch on front panel.
Voltage RegulationRegulation capture range113 VAC to 126 VAC Output Voltage: 120 VAC ±1V The SPR-20i will regulate well beyond 113VAC to 126, but not within 1.0VAC
USB ChargingN/A
Low Voltage TriggerN/A
Dimensions4" H x 17" W x 15.625" D (Standard 2 RU height without feet)
Weight31 lbs
Power Consumption12 Watts for display and control circuits independent of actual load
AC Protection
AC Protection TechnologyVoltage Regulation Extreme Voltage Shutdown Series Multi-Stage Protection Non-sacrificial protection with zero ground contamination
Automatic Voltage ShutoffYes
Under-Voltage ShutoffN/A
Over-Voltage Shutoff140V ±3V
Maximum Current Rating20 (Amps)
Initial Clamping Level188 VAC peak @ 3,000 Amps
Filtration TechnologyLiFT
Filtration RatingTranverse (Differential) Mode: > 40 dB from 10 kHz - 100 kHz, > 80 dB from 100 kHz - 1GHz, (Linear attenuation curve from 0.05 - 100 ohms line impedance) Common Mode (video outlets): > 75 dB, 10 Hz - 50 kHz > 40 dB 50 kHz - 1 MHz
Signal Line Protection
Signal Line Protection1 Tel 3 Cable/Satellite
Shipping Info
Length23.3 (Inches)
Width22.4 (Inches)
Height10.5 (Inches)
Weight38.2 (Lbs)
Unit of MeasureEach
Master Pack Qty1

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