The 604X is a four channel amplifier which combines unique
performance features with outstanding design flexibility to pro-
vide a single chassis “system solution” for most mobile audio
applications. With its on-board crossover, a high performance bi-
amplified system is easily configured.
By utilizing the on-board crossover’s four (4) RCA line outputs, you can steer
specific frequency ranges to additional amplifiers, thus eliminating the need for
external, active crossover components.
As with all Xtant “X” Series amplifiers, the 604X incorporates an on-board noise
gate, forced convection thermal management system, and a Pulse Width
Modulated power supply for high efficiency and unsurpassed reliability. All these
features are encased in Xtant’s exclusive finish of stainless steel and copper!
Standard Features
Forced Convection Cooling:
All Xtant “X” Series ampli-
fiers employ forced convection cooling for thermal management.
An on-board thermal sensing circuit regulates fan speed to main-
tain optimum operating temperature.
PWM Power Supply:
All Xtant “X” Series amplifiers feature a
fully regulated, Pulse Width Modulated power supply. This sup-
ply technology provides high efficiency and consistent output per-
formance even when battery voltage is less than optimum.
Crossover:
Selectable 12/24 dB per octave “Butterworth” filter network with selec-
table Bypass (Full Range), High Pass, Low Pass and Bandpass modes of operation.
Frequency selection is via a 12 pin Frequency Module (SIP). The amplifier is shipped
with a 90 Hz SIP installed, 13 other frequencies are available from your Xtant Dealer.
Refer to page 7 of this manual for a list of the available frequencies.
Noise Gate:
Provides deep muting when no musical signal is present. Features
include adjustable threshold and bypass switch.
Balanced / Floating Input:
When enabled, this circuitry helps to eliminate
“system noise” associated with “ground-loops”.
Modular Expansion Port:
All Xtant amplifiers are supplied with a modular
port used for docking any of Xtant’s signal processing modules.
Protection Circuitry:
Both Thermal and Overcurrent protection has been
incorporated into all Xtant amplifiers. In the event of a problem, the amplifier will
reduce its power to maintain operation.
Status LEDs:
Four LEDs, visible through the cover, indicate operational status of all
Xtant amplifiers. The red LED illuminates when the amplifier is “ON”, the green LED
indicates when the noise gate is open, the yellow LED indicates that overcurrent pro-
tection is employed and the orange LED indicates that the thermal protection circuit
is operational.
PASSIVE Outputs:
The RM8 Resistor Module is designed to activate the “passive
speaker terminals.” It provides 8dB of attenuation for speakers connected to these ter-
minals. RM4, RM12 and RM16 also available.
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