Soundstream Technologies 255 - Manual (Page 3)

(Rapid-Use Branched This new proprietary power
supply topology eliminates “power sags” during low frequency repro-
duction by rapidly increasing the duty cycle, stabilizing the power sup-
ply and allowing it to deliver the power required when reproducing low
frequencies. Also, greater reserve gate power is stored for low volt-
age situations that occur during extreme conditions.
Apex Reduces power sup-
ply stress by 50%. Typical designs degrade the stereo image due to
phase reversal of even-order harmonic distortion that occurs between
the inverted channels. In the STACT design, inversion is done at the
power amplifier drive stage. Since the fully symmetrical power ampli-
fier produces no even-harmonic distortion itself and all preamplifier
circuitry is run completely in-phase, no even harmonic distortion phase
reversal occurs.
Protection Topology provides three types of protection:
1. Output protection against short circuits or improper loads.
2. Ground fault detection: Shuts down the amplifier when a significant
voltage
Volts) fluctuation occurs between electrical (turn-on lead)
and battery ground.
3. Thermal Protection: Puts the amplifier into thermal rollback or shuts
the amplifier down in extreme thermal conditions.
Hawkins Bass Control provides a focused subwoofer boost (O-9
at 45 Hz) and routes otherwise wasted amplifier power back to the
audible bandwidth.
Harmonic Bass Alignment The 2nd and 3rd order harmonic peaks
are critically aligned to fundamental peaks at low frequencies. This
produces tighter, more accurate bass reproduction.
Drive Delay Amplifier section powers up 2 to 3 seconds after the
power supply eliminating turn-on pops. Turn off process is reversed:
Amplifier section turns off first, followed by the power supply.
Dynamically Optimized Power Grid Power grid is evenly distrib-
uted between primary and secondary power supplies, providing greater
dynamics and improved RF filtering.
4
All transistors are ideally located and sandwiched be-
tween the circuit board and the to provide cool efficient ampli-
fier operation.
Differentially Balance RCA Input eliminates ground loop related noise
in the audio path.
Continuously Variable Crossover Networks (355 555): 12
Octave 2-way crossover, variable from 65 to 220 Hz and 24
dB/Octave crossovers variable from 30 to 120 Hz. 555 on/y
12 dB/Octave 3-way crossover which can be selected for mid-bass
(65 to 500 Hz) or midrange (65 to 4,000 Hz) operation.
Built-in Staggered S.I.P. Crossover Network (255) Built-in two-way
crossover is designed to send high pass information to
channels 1-4 of the amplifier and send low pass to channel 5 of the
amplifier.
and crossovers.
Flexible Input Level Control allows 200 to 5 V input
sensitivity.
Symmetrical Discrete Balanced Class A Drive Boards Auto-ad-
just for linear performance while driving low impedance loads.
Removable Front Spoiler allows for stealth installation of RCA,
Speaker and Power wiring.