Cast Aluminum Heatsink: The cast aluminum heatsink dissipates heat
generated by the amplifier's circuitry. The inherent
advantage of casting provides a 30% improvement of cooling over conventional
extrusion heatsink designs.
Dynamic Thermal Management (DTM):
DTM Evenly distributes excess heat across entire
(Maximum Efficiency Heat Sink Application-Third Generation): MEHSA is a Rockford
Fosgate proprietary process that increases the heat transfer from the MOSFET
devices to the heatsink. The multi-layer insulated metal MEHSA substrate
operates with minimal thermal resistance, spreading heat both downward and
outward to quickly dissipate heat from each device across the heatsink. This
allows greater power output, enhanced thermal stability, and maximum
Trans-ANA (TRANSconductance Active Nodal Amplifier): Trans-ANA
is a circuit that allows the audio signal to pass through the amplifier at low
voltage. The signal is directly level-shifted to the fixed high voltage rails
via a pair of drive transistors. Signal linearity is assured by an active node
formed by the drive transistors at ultrasonic frequencies. The result is
crystal clear sound quality.
(NOn-Multiplying Advanced Decision): NOMAD is an intelligent
protection circuit that uses an analog computer to make real time decisions
regarding temperature, voltage, current and impedance. The unit is protected
without limiting sound output unless needed.
TO-247 MOSFET: The Punch P500-4
utilizes ultra high performance MOSFET output devices, giving the amplifier more
power handling capability as well as lower thermal impedance for more reliable
operation, even under the harshest load conditions.
(Discrete Surface Mount): In the manufacturing process high speed
robotics are used to place 1% tolerance parts and large board traces. DSM
improves the efficiency of the circuit, decreases cross-talk from other discrete
components and lowers operating temperature.
Power and Protection LEDs: The LEDs are
located on top of the amplifier. A blue Power LED illuminates when the amplifier
is turned on. A red Thermal LED illuminates if the amplifier overheats. The yellow Protect LED illuminates if a short
circuit or too low an impedance is detected at the speaker connections. When any
of the protection circuits engage, the amp automatically shuts down until the
problem is corrected.
Internal Crossover: The
amplifier's internal crossovers have a 12 dB/octave slope. There are independent
crossovers for the front and rear channels. Each is selectable for high-pass, all-pass (full range), or
low-pass operation and is variable from 50Hz to 500Hz.
Punch EQ: Punch EQ works along with the
crossover switch. When the crossover is set to low-pass,
the Punch EQ acts as a variable bass boost; 0-18 dB at 45 Hz. When the crossover
is set to high-pass, the Punch EQ acts as variable treble boost, 0-12 dB at 12
kHz. When the crossover is set to all-pass, both the bass and treble boost
circuits are active.
Power Connections: The power and ground
terminals are nickel-plated captive c-clamp wire connectors and will accommodate
up to 4-gauge wire. An external 80-amp fuse (not included) must be
installed on the power wire. If a wiring kit is used which includes a fuse with
a value other than 80-amps, the original should be replaced with an 80-amp fuse. The remote turn-on terminal will accept wire
sizes of 12- to 24-gauge. A Phillips-head or slotted screwdriver (not supplied)
is required to tighten/loosen the terminals.
Differential Input: Differential input
circuitry measures the voltage of both the positive (+) and negative (-)
portions of the input signal, subtracting the voltage common to both conductors
(noise); resulting in a cleaner signal. Reducing the noise on the input then
improves the sound quality of the output.
Speaker Connections: The
4-channel nickel-plated clamp wire connectors will accept 8-gauge to
18-gauge wire. A Phillips-head or slotted screwdriver (not supplied) is required to
tighten/loosen the terminals.
Remote Punch EQ (PEQ) Connection:
An RJ-45 jack is provided for connecting an optional remote PEQ control (575ROCKPEQ, sold separately). If you use the remote PEQ, the Punch EQ control for the rear
channels on the
amp is disabled, and replaced by the remote.
Previous model Punch Bass and Para-Punch remotes will not work with this amp.