voltage exceeds 140V, it will shut off power to the outlet and the Extreme Voltage LED will light.

Protection OK Indicator

Although the Furman SMP circuit assures virtually maintenance free protection from transient voltage spikes and surges, nature has a way of occasionally creating electrical forces that are beyond the capabilities of any Transient Voltage Surge Suppression device to absorb without some degree of damage. In the rare instance that this occurs, the blue LED located in the center of the front panel will dim, even though AC power is present at the unit’s outputs. If this happens, some level of protection from voltage surges will remain, but the Furman’s clamping voltage rating will be compromised. The unit must be returned to Furman Sound, or an authorized Furman Service center for repair.

NOTE: If the mains power is above the high cutoff voltage and has caused the unit to remove power from its outlets, it cannot restore power without the operator manually turning the unit off, then on again. Avoid turning the unit back on, without first checking the source of the problem, and perhaps changing the AC source.

Telco – Satellite – Cable Transient Voltage Surge Suppressors

The SPR-20i features transient voltage surge suppression for both standard telephone lines, as well as cable or satellite lines utilizing standard coaxial connectors. As these surge suppressors are in-line, they will require an additional cable to connect from their output to the control device requiring protection.

All in-line surge suppressors feature our exclusive ground contamination free technology. This aids in eliminating audio buzzing, and the video hum-bars that can result from typical in-line suppressors. Further, our cable and satellite suppressors are TIVO® – DVR friendly as well as HD-Digital Television ready. Both DC carrier signals as well as high bandwidth signals can pass through our circuit. In fact the bandwidth is less than 0.1dB loss at 1GHz!

To connect your cabling to these in-line protectors, simply follow the in and out indications marked next to the Telco, Cable and Satellite connectors.

NOTE: It is not possible to make an in-line cable or satellite protector “maintenance-free” as we have accomplished with the 120 VAC line. This would necessitate limited signal bandwidth that would not allow the signal to pass. Under extreme conditions, it is possible that the surge suppression in one of these devices could sacrifice itself after a catastrophic event. If the telephone, cable or satellite signal will no longer pass through our protector, please contact your local service representative, installer or Furman for servicing. Since the telco circuit is modular, replacement may be accomplished in seconds with a new TVSS module. To test this, simply disconnect the incoming and out going cable from the SPR-20i. Connect the incoming connector to the component that formerly received the out going connector, thus by-passing the in-line protection. If the signal is present (but not when used with the SPR-20i) then the protection circuit is damaged (assuming it worked properly before a storm or catastrophic event).

AC Voltage and Current Meter

Your SPR-20i contains a true RMS precision incoming AC volt/current meter. This meter continuously monitors either the incoming AC voltage, or the total system AC current draw. To continuously read current or voltage, simply select the setting you wish to monitor by either pressing the voltage/current switch for current, or disengaging the switch for voltage. Since the AC voltage meter indicates incoming voltage, you should not be concerned by readings above or below 120VAC.

NOTE: For those that mount the SPR-20i where it could be visible during use, we have included a rear panel mounted dimmer switch for the blue digital voltage and current meter. This allows the user to entirely dim this display when the room lights are turned off for optimum video viewing.

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Furman Sound SPR-20i owner manual Protection OK Indicator, Telco Satellite Cable Transient Voltage Surge Suppressors
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SPR-20i specifications

Furman Sound has long been at the forefront of power management technology, and their SPR-20i unit is a prime example of their innovation and engineering prowess. The SPR-20i is a highly advanced power conditioner designed for professional audio applications. It combines superior power protection, voltage regulation, and filtration to ensure that audio equipment operates at peak performance.

One of the standout features of the SPR-20i is its Linear Filtering Technology (LiFT), which significantly reduces electromagnetic and radio frequency interference. This technology ensures that power reaching your equipment is clean and stable, essential for high-fidelity audio reproduction. By minimizing noise, it enhances the performance of connected devices, resulting in a cleaner sound with greater detail and clarity.

Another key characteristic of the SPR-20i is its SmartSequencing technology. This feature offers intelligent power sequencing for up to eight connected devices. By controlling the startup and shutdown sequence, it prevents power surges that can damage sensitive audio equipment. This is particularly beneficial in live sound environments, where equipment is often powered up and down frequently.

The unit's robust build quality is also worth noting. Encased in a durable rack-mountable chassis, the SPR-20i is designed to withstand the rigors of touring and extensive use in studio environments. It includes high-quality receptacles with superior connections to reduce resistance and ensure long-lasting performance.

For ease of use, the SPR-20i features a user-friendly digital display that provides real-time information about voltage levels and power consumption. This allows sound engineers and technicians to monitor the power conditions of their setup at a glance, making any necessary adjustments swiftly.

Additionally, safety is a top priority with the SPR-20i. It offers comprehensive surge protection and over-voltage protection, safeguarding your valuable equipment from power spikes and fluctuations. Its built-in circuit breaker further enhances safety, allowing for quick resets if needed.

Overall, the Furman Sound SPR-20i is an intelligent power management solution that combines advanced technologies with practical features. With its focus on clean power, equipment protection, and ease of use, it stands out as an essential tool for audio professionals seeking to optimize their audio systems.
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