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Arc Audio Class A/B SE 4200 800w 4ch SQ Audiophile Amplifier
Signature Edition is a Hard Bias Class A/B amplifier. A simple Class B amplifier uses 2 output transistors to supply the current that moves the speaker. The positive transistor will push the woofer out and the negative will pull it back. In this design, only 1 transistor is working at any given time. It is the transition between positive and negative that leads to the higher distortion that makes a Class B amplifier unacceptable for audio reproduction. In most cases, a bias circuit is added to a Class B amplifier making it a Class A/B. The Bias circuit improves the distortion by slightly turning on the unused output device while the current is flowing across the other. The more bias you add the lower the distortion but there is a side effect. Heat is created as the 2 output transistors are both on at the same time. The more bias you add the better it sounds but the more heat you produce but heat changes the natural bias of the output devices.
More heat equals more bias until you reach the point of over bias and the amplifier fails. The trick to the Signature Edition Bias circuit is managing the bias current at any temperature. By carefully matching the bias of every amp we are able to maintain stable bias across the temperature range allowing the technician "dial in" much more bias than a conventional class A/B amplifier. This is one of the key elements to the Signature Editions amazingly transparent sound.
The key to running so much bias is heat management. Signature Edition has a unique heat sink design that uses a 4" fan mounted in the center of the circuit board to force cool air in a cross-flow pattern across a massive finned heat sink before exhausting it from the ends. This design minimizes the effects of installation location on the thermal performance of the amplifier. Mounted upside down, under or behind a seat or beneath a panel Signature Edition will perform equally well.
To further improve the dynamics and efficiency the Signature Edition amplifier exclusively use stiffly regulated, fully isolated power supplies. Regulation not only improves the damping factor and overall control of an amplifier but it eliminates any effect of voltage drops in the charging system may have.
Audiophile sound quality based design
Designed by Robert Zeff
Class A/B switching design
Microprocessor controlled design
Microprocessor controlled Code based flashing diagnostics
Concealed adjustment controls
Open architecture adjustable crossovers on all channels HP/BP/LP/FP
12/24Db per octave selectable crossover slopes on all channels
Internal chassis force cooled speed controlled fan for optimum cooling
Hi/Low-level balanced switchblade RCA inputs for maximum system integration
RJ45 Ethernet input connections for true balanced input connections
Block type terminal connections
256 color user-selectable illumination circuit
Combined Bias circuit and temperature regulation circuit to regulate bias and lower THD at any point in total thermal cycle
Microprocessor high voltage power supply allows the amplifier to optimize power output at different ohm loads without the loss of efficiency or sound quality
Vdrive based preamp stage improves efficiency lower internal signal loss
Handpicked output devices used on all SE amplifiers.
4 Channels @ 4 ohms 110 Watts
4 Channels @ 2 ohms 200 Watts
2 Channels @ 4 ohms (Bridged) 400 Watts
2 Channels @ 2 ohms (Bridged) 400 Watts
Frequency Response 4Hz - 100kHz
Crossover Range 30Hz - 550kHz
Crossover Range X10 300Hz - 5500kHz
Bass Boost 0 - 15dB @ 20Hz - 80Hz
S/N Ratio 90 dB
Input Sensitivity (Low) .3V - 4V
Input Sensitivity (Bal) .4V - 8V
Max current draw 222 Amps @ 1600 Watts 20% THD
Idle Current 2.3 Amps
Dimensions 19.5"(L) x 8.0" (W) x 2.5"(H)