In 1993, professional rack-mounted balanced power products from Equi=Tech were introduced in the marketplace making these the first commercial balanced power systems ever offered for sale.  Over the years, the technology has evolved as these award-winning products have gained a reputation among professional engineers for their ruggedness, dependability and as a highly effective means of reducing noise.  Professional rack systems are designed as workhorses for 24/7 around the clock operation in the most demanding professional environments.  They are as finely tuned as any product Equi=Tech offers but without all of the frills and cosmetics that some of the other products have.  Equi=Tech invested these costs into high quality components and fabrication methods that insure the demanding level of high performance and fail-safe operation required by professional engineers.

Large rack systems are primarily intended for professional use, however some audiophiles and theater owners choose the larger rack systems because they have the capacity to drive the all of their biggest amplifiers and video plasma or projection screens without even a blink.  

In all types of professional venues with high power requirements, large rack systems serve their purpose well.  For an example, a studio may have a very large board with automation controls running DC servo motors.  The power supplies for these automation boards consume a lot of power on a full time basis that normally will drain power reserves for the rest of the studio.  In such cases, a large 7.5 or 10kVA rack system installed in the board's power supply rack is a perfect fit for powering the console power supplies.  This leaves the rest of the studio free to operate on a separate balanced AC system of its own.  Another use for these systems is for location power. Professional sound reinforcement technicians appreciate these units because they vitually eliminate nuisance noise problems, saving them hours and hours of time chasing down noise gremlins. A 10kVA unit can easily drive a small to moderately sized sound reinforcement system or an amp rack or very large FOH console setup with numerous outboard racks.

A remarkable feature of these large rack systems is that they are not really very large at all.  Both the 7.5 and 10kVA models occupy only 4ru of rack space (7" tall) but they deliver 80 and 100 Amps (respectively) of clean balanced power to equipment and they run barely warm at full load capacity. 

Models 7.5R and 10R require a 50A (California Style) Hubbel twist-lock cord connector fed by a 40- or 50-amp circuit  to power them up, however cam-lock inputs may be specified instead of the Hubbel 50A twist-lock when ordering.  The Model 7.5R has 4 front panel circut breakers controlling 4 output circuits -- the Model 10R has 5.  The stock version of the rear panel has 24 "Edison-type" output receptacles (NEMA 5-15R.)  Among these outlets, each circuit includes one Edison-type duplex GFCI receptacle.  As an alternative to the Edison outlets, 30-amp 125-volt twist lock output receptacles are available instead ("T" Option) and require no GFCI protection.  This arrangement is more fail safe in situations where there is no room for any nuisance GFCI malfunctions. 

Both models are designed to operate with either a 208V or 240V input and can be switched from one voltage to the other by removing the lid and manually moving one internal jumper wire.  An optional front panel switch ("SW" option) is available so either voltage can be selected quickly and easily.  A front panel 3-digit LED voltmeter is a standard feature for both models that includes an IN-OFF-OUT mode switch so voltage can be monitored at either the input or output of the system. 

The "EA" suffix on some 7.5R models indicates "World Power" feature that provides for American equipment use anywhere in the world.  The 50/60Hz transformer is too large to feature on the Model 10R because of chassis size restrictions.  If the EA version of the Model 7.5R is ordered for touring purposes, it is strongly recommended that the "SW" option be included.