High stability Class D amplifier
The ST series is our new amplifier series which offers a very efficient and stable operation. The housing is a 2U 19“ metal case. This state of art amplifier design satisfies with a transparent sound, a high dynamic range and low distortions. They are suitable for subwoofers and full range speakers as well as line array setups. The innovative cooling system with automatic, speed controlled, low noise fans, offers a perfect cooling of all components. An integrated Clip Limiter protects the amplifier and speaker from unwanted clipping distortions. Female input XLR sockets are active balanced and have a link through to a male socket. The output section contains Neutrik NL4 sockets and binding posts for the 2CH Models.
4-acoustic Germany ST-6400 4-Channel Amplifier
Model Name ST-4200 ST-4400 ST-6400 GS1 (EAN) CODE 4260318511469 4260318511476 4260318511483 System Type 2-Channel Class D Amplifier 4-Channel Class D Amplifier 4-Channel Class D Amplifier Output Power
all channels driven
20Hz - 20 kHz, 0.1 % THD2 x 4000W @ 2Ohm
2 x 3000W @ 4Ohm
2 x 2000W @ 8Ohm4 x 2000W @ 2Ohm
4 x 1500W @ 4Ohm
4 x 1000W @ 8Ohm4 x 3000W @ 2Ohm
4 x 2250W @ 4Ohm
4 x 1500W @ 8OhmOutput Power
Bridge mode1 x 8000W @ 4Ohm
1 x 6000W @ 8Ohm2 x 4000W @ 4Ohm
2 x 3000W @ 8Ohm2 x 6000W @ 4Ohm
2 x 4500W @ 8OhmTHD+N @ 8Ω 1kHz,1dB ≤0.06% ≤0.06% ≤0.06% Slew Rate >60v/μs >60v/μs >60v/μs Frequency Response
@1Watt, 8Ohm10Hz -34kHz / ±0.3dB 10Hz -34kHz / ±0.3dB 10Hz -34kHz / ±0.3dB Damping Factor
(1kHz and below)>450:1 >450:1 >450:1 Signal to Noise Ratio
20Hz -20 kHz>100dBA >100dBA >100dBA Channel Separation
Crosstalk@1kHz>70dB >70dB >70dB Voltage Gain 46dB (0,775V:153V) 43dB (0,775V:108V) 45dB (0,775V:134V) Input Sensitivity selectable 0.775V/1V/1.5V/2V selectable 0.775V/1V/1.5V/2V selectable 0.775V/1V/1.5V/2V Input Impedance 30k Ohm Balanced
15k Ohm Unbalanced30k Ohm Balanced
15k Ohm Unbalanced30k Ohm Balanced
15k Ohm UnbalancedFront Control Power switch, Gain control Power switch, Gain control Power switch, Gain control Rear Control Sensitivity Switch,
Mode SwitchSensitivity Switch,
Mode SwitchSensitivity Switch,
Mode SwitchLED Indicators Signal -30dB / -10dB, green
Signal -4dB, yellow
Clip, orange
Protect, red
power, green
Bridge, yellowSignal -30dB / -10dB, green
Signal -4dB, yellow
Clip, orange
Protect, red
power, green
Bridge, yellowSignal -30dB / -10dB, green
Signal -4dB, yellow
Clip, orange
Protect, red
power, green
Bridge, yellowInput Connectors XLR Active balanced
pin1 gnd / pin 2+ / pin3-XLR Active balanced
pin1 gnd / pin 2+ / pin3-XLR Active balanced
pin1 gnd / pin 2+ / pin3-Output Connectors 2 Neutrik NL4 Sockets
2 Binding Posts4 Neutrik NL4 Sockets 4 Neutrik NL4 Sockets Cooling Continuously Variable
speed fanContinuously Variable
speed fanContinuously Variable
speed fanProtection Full short circuit, Open circuit,
thermal, Ultrasonic, RF Protection.
Stable Into reactive or
Mismatched loadsFull short circuit, Open circuit,
thermal, Ultrasonic, RF Protection.
Stable Into reactive or
Mismatched loadsFull short circuit, Open circuit,
thermal, Ultrasonic, RF Protection.
Stable Into reactive or
Mismatched loadsLoad Protection On/Off muting
DC fault power
Supply shutdownOn/Off muting
DC fault power
Supply shutdownOn/Off muting
DC fault power
Supply shutdownOperating Voltage 220V (+/- 10%) 50-60Hz 220V (+/- 10%) 50-60Hz 220V (+/- 10%) 50-60Hz Fuse T-25A T-20A T-25A Dimensions (h/w/d) 19“/2U 483W x 451D x 88H 19“/2U 483W x 470D x 88H 19“/2U 483W x 470D x 88H Net weight 22,5 kg 23,0 kg 25,5 kg