Soundstream Technologies Angina A4 - Manual (Page 4)

Features of the A4
Power Supply 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.
(Stabilized Apex Current 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.
Protection Three types of protection for 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
A built-in subsonic filter at 45Hz helps protect the speakers.
Harmonic Bass Alignment 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 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 Power grid is now evenly dis-
tributed between primary and secondary power supplies, providing greater
dynamics and improved RF filtering.
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Desiun Features of the A4
All transistors are sandwiched between the circuit board
and the to provide cool efficient amplifier operation in a smaller
package.
Continuously Variable Crossover Networks low
pass crossover variable from 50 to
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
slope.
Flexible Input Level Control 200mV to 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.
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