Rockford Fosgate 250.1 manual Balanced Line Inputs, NOMAD NOn-MultiplyingAdvanced Decision

◆ Balanced Line Inputs (250.2)

Using the 250.2 with the BLT (Balanced Line Transmitter)	Figure 2	RCA Input	Differential
provides the last word in achievable rejection of noise	Center		Input
induced in the cable between the source and the amplifier.	Conductor
The differential input circuitry (Figure 2) used in the bal-	Outer
anced input system rejects whatever signals are common
	Shield
to both of the shielded, twisted-pair conductors. Balanced	Differential inputs only amplify the difference between two con-
line is universal in concert installations where the stage and	ductors. Note: the noise spikes appear on both the center conduc-
	tor and the outer shield and therefore are not amplified.
mixing consoles are hundreds of feet apart. Long signal
cables and electrically-noisy environments make signal

integrity and noise rejection an extremely difficult challenge.

THE RESULT: Quiet transmission of audio from source to amplifier.

◆NOMAD (NOn-Multiplying Advanced Decision)

The Power amplifiers use an analog computer process to absolutely maximize safe output power under all operating conditions. The innovative NOMAD (NOn-Multiplying Advanced Decision) system is the most sophisticated version of this technique ever used, bringing previously unavailable levels of accuracy, stability, temperature immunity and reliability to this critical process. NOMAD makes advanced decisions based on device voltages to precisely control the awesome levels of current available in the output MOSFETs to safe values

–but only when absolutely needed.

THE RESULT: Extremely fast protection system that always protects the amplifier and never degrades the sound.

◆MOSFET Devices (Metal Oxide Semiconductor Field Effect Transistor)

Rockford Fosgate is one of the few manufacturers in any of the sound communities to utilize MOSFET devices in both the power supply and the output stages. MOSFET (Metal Oxide Semiconductor Field Effect Transistor) devices offer several important inherent advantages over the 30 year old technology of bi-polar design. These advantages include: thermal stability, switching speed, ultra low output impedance and wider bandwidth linearity. In addition, MOSFET and vacuum tubes share many important operating characteristics. However, the MOSFET device is much faster, wider in bandwidth, measurably lower in distortion and far more linear than vacuum tubes.

THE RESULT: Operational characteristics of vacuum tubes without the performance limitations of tube design.

◆ITS (Increased Thermal Stability)

The ITS (Increased Thermal Stability) Power Supply design is new in Rockford Fosgate amplifiers. A major problem associated with any amplifier design is how to get rid of the heat generated by its circuitry. Clearly, it is highly desirable to minimize the amount of heat generated in the first place. The “250 series” Power amplifiers employ a new toroidal power transformer design in which the high current input leads are carried directly to the switching power MOSFETs. This both minimizes PC board heating and takes advantage of natural air cooling of these leads.

THE RESULT: Maximizes power supply efficiency by eliminating unnecessary heat generation.

– 4 –