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TECH NICAL DESIGN FEATURES  

Many ofthe solutions to common design problems encountered by Rockford Fosgate engineers created entire new circuit  

designs as well as new ways to construct the Punch 50.2 and 50.1 Power Amplifiers. In our flagship amplifiers, no expense  

was spared in design and construction from the unique circuitry design to the manufacturing process that has proven to be  

the industry reference for many years. Described below are just some ofthe accomplishments achieved by our engineering  

and manufacturing staff.  

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trans•nova (TRANSconductance NOdal Voltage Amplifier)  

The trans•nova (TRANS conductance NOdal Voltage Amplifier) is a patented circuit (U.S. Patent 4,467,288) that allows  

the audio signal to pass through the amplifier at low voltage. Each amplifier channel utilizes its own “fully floating”power  

supply and is configured to increase power gain. The increase in power gain allows the drive stage to operate at a lower  

voltage. Alowvoltage drive stage is the same principle used in high qualitypreamplifiers to produce high linearityand wide  

bandwidth.  

E-I  

I-E  

trans•nova circuitry  

The resulting design utilizes an output stage with a simpler gain structure and a shorter total signal path than conventional  

high voltage (bi-polar) designs. The numberofstages is reduced from five ormore to three. The outputstage is furtherrefined  

into a trans-impedance stage (currentto voltage converter) to achieve a shortloop (fast) negative feedback. The outputstage  

is driven cooperatively by a transconductance stage (voltage to current converter).  

THE RESULT: Superior sound quality, greater efficiency and higher reliability.  

◆

DIAMOND (Dynamically Invariant AMPlification Optimized Nodal Drive)  

DIAMOND(DynamicallyInvariantAMplification Optimized NodalDrive - patentpending) is an importantadvance in circuit  

design which reduces high frequency distortion. Amplifiers which utilize a large array of output MOSFETs cause a high  

capacitive load on the driver stage. This load can make the high frequencies sound harsh. The DIAMONDcircuit eliminates  

highfrequencydistortionbyallowingthedrivertooperatewith20dBormoreofcurrentheadroom, whereastraditionaldrivers  

have only 6dB of current headroom.  

THE RESULT: Lower distortion and greater inherent stability.  

◆

TOPAZ (Tracking Operation Pre-Amplifier Zone)  

The TOPAZ (Tracking Operation Pre-Amplifier Zone) circuitry solves ground loop noise problems common to automotive  

amplifier design. This innovative new development allows vastly improved isolation of the input signal grounds from the  

powersupplyground ofthe amplifier. This is accomplished byallowing the source unitto controlthe potential“environment”  

ofthe entire input structure or “zone”ofthe amplifier. This process improves the noise rejection ofthe amplifier by 30-40dB  

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an astounding 20-100 times better than amplifiers without TOPAZ.  

THE RESULT: Elimination of troublesome ground loop noise between source and amplifier.  

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