+63 9777 2363 27
+63 9777 2363 27
Current Feedback Balanced Class AB topology
Dual DC Servos
Dual-Differential Gain Stage
The AT4000 series amplifiers, available with 2 to 7 channels, share the design philosophy and circuit sophistication of ATI’s award-winning AT6000 Series amps at a reduced power of 200W RMS per channel at 8 ohms and 300W RMS at 4 ohms. Furthermore, their “signature series” designation with a facsimile of Kessler’s signature on the main panel attests the special nature of these amplifiers.
Current Feedback Balanced Class AB topology
Dual DC Servos
Dual-Differential Gain Stage
ThermalTrak™ output devices are incorporated in Signature Series amps to provide an integrated device for temperature sensing with the output transistor resulting in real-time bias performance. Combining these advancements with dual DC servos reduces DC offset at the output to insignificant levels.
The use of a modular PCB layout with amplifier and power supply parts on the same card with edge to edge isolation of AC and signal input provides improved signal-to-noise ratio. Dual toroidal transformers, dual power switches and dual AC power cords bring a complete dual-mono design to the AT4002 and AT6002. Multi-channel amplifiers up to the 7-channel AT4007 and AT6007 models may be connected to independent 20 amp circuits for greater sustained output power than would be possible than from a single AC circuit.
4000 Series amps are rated at 200 Watts RMS from 20Hz to 20kHz with no more than 0.03% THD at 8 ohms with all channels driven and 300 Watts RMS at 4 ohms under the same conditions. Signal-to-noise ratio is typically -126dB referenced to full output so that each Signature Series amp is capable of playing back the full dynamic range available on today’s lossless recordings.
Numbers of Channels
2 to 7
Full Bandwidth Power Output into 8Ω (FTC)
200WRMS
Full Bandwidth Power Output into 4Ω (FTC)
300WRMS
Frequency Response:
±0.ldB 20Hz – 20kHz
Power Bandwidth (FTC)
+0,-3 dB 5Hz – 100kHz
Phase Response:
+5 to -15°, 20Hz – 20kHz @ 1W
Input Sensitivity for Full Rated FTC Output Power – 8Ω:
1.6 Volts
Signal-to-Noise Ratio (Ref FTC Rated Power, A-Wtd):
>125dB
Total Harmonic Distortion + Noise (20Hz – 20kHz):
<0.03%
Intermodulation Distortion:
<0.03%
Recommended Load Impedance:
Safe for all types of loads. Rated for 4Ω to 16Ω
Damping Factor:
>400
Crosstalk:
Greater than –80 dB from 20 Hz to 20 kHz
Gain
28dB ±0.2dB
Slew Rate:
>60V/µS
Input Impedance:
28kΩ
Output DC Offset
Less Than ±1mV
Chassis Dimensions (W x H x D) mm:
440 X 4RU X 457mm
Shipping Weight (kg):
AT4002: 35
AT4003: 39
AT4004: 41
AT4005: 45
AT4006: 50
AT4007: 54
Remote Trigger
Activated from 3.3VDC to 24 VDC via a heavy-duty relay
Protection Circuits
Optically – coupled with full automatic reset
Toroid Transformers
40% more efficient than EI type. Separate bi-filar windings for each channel guaranty lower noise and crosstalk
Circuit Boards
Double-sided, FR-4 glass-epoxy, computer-grade boards are assembled in-house
Soft Start Circuitry
Ultra soft turn on reduces in-rush current to a minimum. Multiple units can be turned on without tripping circuit breakers eliminating the need for sequencing
Power Transistors
High-current, bi-polar and ThermalTrak™ output transistors insure optimized performance in real-time
Power Supply Capacitance
46,200 µF (microfarads) per channel
Power Cord
Dual detachable, 3-wire cord.
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