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Desiun
Features of the A4
+
RUBITM
Power Supply
(Rapid-Use Branched Impulse) Our new power
supply eliminates “power sags” during low frequency reproduction by
rapidly increasing the duty cycle, stabilizing the power supply and allow-
ing it to deliver the power required when reproducing low frequencies.
Also, greater reserve gate power is now stored for low voltage conditions
that occur during extreme conditions.
+ STACTTM
(Stabilized Apex Current
lopology)
Reduces power supply
stress by 50%. Use of inverted channels usually degrades the stereo
image due to phase reversal of even order harmonic distortion that oc-
curs between the inverted channels. In the STACT design inversion is
done at the power amplifier drive stage. Since the fully symmetrical power
amplifier produces no even harmonic distortion itself and all preamp cir-
cuitry (which does produce even harmonics) is run completely in phase,
no even harmonic distortion phase reversal occurs.
+ TridentTM
Protection
Three types of protection for
RUBICON
amplifiers:
1.
Output protection against short circuits or improper loads.
2.
Ground fault detection shuts down the amplifier when a significant (5
volt or greater) voltage fluctuation occurs between audio ground and bat-
tery ground.
3.
Thermal protection will shut the amplifier down in extreme thermal
conditions.
+
Hawkins Bass Control
Provides focused subwoofer boost and routes
wasted subsonic power to the audible bandwidth. The A4 contains the
fixed Hawkins Bass Control which allows you to boost bass 6dB at
45Hz.
A built-in subsonic filter at 45Hz helps protect the speakers.
+
Harmonic Bass Alignment
TM
The 2nd and 3rd order harmonic peaks
are critically aligned to fundamental peaks at low frequencies. This pro-
duces tighter, more accurate bass reproduction.
+
Drive Delay II Muting
TM
Amplifier section now powers up 2
-
3 seconds
after power supply, eliminating turn on pops. Turn off process is reversed.
Amplifier section turns off first, followed by power supply.
+
Dynamically Optimized Power Grid
TM
Power grid is now evenly dis-
tributed between primary and secondary power supplies, providing greater
dynamics and improved
RF
filtering.
6
Desiun Features of the A4
+ ChassisinkTM
All transistors are sandwiched between the circuit board
and the heatsink to provide cool efficient amplifier operation in a smaller
package.
+
Continuously Variable
Lowpass
Crossover Networks
12dB/oct
low
pass crossover variable from 50 to
220Hz.
+
Built-in Staggered S.I.P. Crossover Networks
Built-in high pass elec-
tronic crossover is designed to send high pass information to the ampli-
fier with a
12dB/oct
slope.
+
Flexible Input Level Control 200mV to
5V
input sensitivity. Stereo
level control allows user to optimize system level control.
+
Symmetrical Discrete Balanced Class A Drive Boards
Auto-adjusts
for linear performance in low impedance loads.
7