Signature Edition HighEnd ClassA/B Amplifier designed by Robert Zeff
The Signature Edition is a hard bias Class A/B amplifier. A simple class B amplifier uses 2 output transistors to provide the current that moves the speaker. The positive transistor pushes the woofer out and the negative pulls it back. In this design, only 1 transistor is working at a time. It is the transition between positive and negative that results in 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 to make it a class A/B amplifier. The bias circuit improves distortion by turning on the unused output device slightly while current flows through the other device. The more bias you add, the lower the distortion, but there is a side effect. Heat is generated because the two output transistors are on at the same time. The more bias you add, the better it sounds, but the more heat you generate, the more heat changes the natural bias of the output devices.

The trick with the Signature Edition bias circuit is to manage the bias current at any temperature. By carefully adjusting the bias of each amplifier, it is possible to keep the bias stable over the entire temperature range, allowing the engineer to "dial in" much more bias than a conventional Class A/B amplifier. This is one of the key elements to the amazingly transparent sound of the Signature Editions.

The key to running this much bias is thermal management. The Signature Edition features a unique heatsink design that mounts a 4-inch fan in the center of the PCB to force cool air in a cross-flow pattern over a solid, finned heatsink before expelling it at the ends. This design minimizes the impact of installation location on the amplifier's thermal performance. Mounting the Signature Edition upside down, under or behind a seat, or under a panel will achieve the same performance.

To further improve dynamics and efficiency, the Signature Edition amplifier uses only stiffly regulated, fully isolated power supplies. The regulation not only improves the damping factor and overall control of an amplifier, but also eliminates any effects of voltage drops in the load system.
  • hand-selected Sanken power amplifier transistors
  • uncompromising construction
  • temperature controlled bias for minimum distortion at any temperature
  • hard regulated, microprocessor controlled power supply with automatic switching from HighVoltage to HighCurrent at low load.
  • temperature controlled fan
  • damping factor >1000
  • HP/LP/BP switchable on all channels from 30-5500 Hz, 12/24 dB/oct switchable
  • BassBoost adjustable 20-80Hz and 0-15 dB
  • separate gain controls for left/right
  • Input select switch
  • Symmetrical inputs via 8-pin Western connector
  • illuminated ARC logo in 256 freely selectable colors
  • SubLevel control included (for 4-channel freely assignable)

Features:

  • 2-channel amplifier
  • 4 channels @ 4 ohms: 65 Watts
  • 4 channels @ 2 ohms: 110 Watts
  • 2 channels @ 4 ohms (bridged): 220 Watts
  • 2 Channels @ 2 ohms (Bridged): 145 Watts
  • Frequency Response: 4Hz - 100kHz
  • Crossover Range: 30Hz - 500Hz
  • Crossover Range X10: 300Hz - 5500kHz
  • Bass Boost: 0 - 15dB @ 20Hz - 80Hz
  • S/N Ratio: 93dB
  • Input Sensitivity (Low): .3V - 4V
  • Input Sensitivity (Bal): .4V - 8V
  • Max current draw: 79A @ 540 Watts 20% THD
  • Idle Current: 3 Amps
  • Fuse: 2 x 40 Amps
  • Dimensions: 205 x 65 x 390 mm
Rated 5/5 based on 28 customer reviews
Benedikt Golla - by , Feb 07, 2021

4100SE

ARC Audio 4100SE 4-Kanal Verstärker

4100SE

ARC Audio

Regular price €1.149,00

inkl. MwSt., zzgl. Versand

Signature Edition HighEnd ClassA/B Amplifier designed by Robert Zeff
The Signature Edition is a hard bias Class A/B amplifier. A simple class B amplifier uses 2 output transistors to provide the current that moves the speaker. The positive transistor pushes the woofer out and the negative pulls it back. In this design, only 1 transistor is working at a time. It is the transition between positive and negative that results in 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 to make it a class A/B amplifier. The bias circuit improves distortion by turning on the unused output device slightly while current flows through the other device. The more bias you add, the lower the distortion, but there is a side effect. Heat is generated because the two output transistors are on at the same time. The more bias you add, the better it sounds, but the more heat you generate, the more heat changes the natural bias of the output devices.

The trick with the Signature Edition bias circuit is to manage the bias current at any temperature. By carefully adjusting the bias of each amplifier, it is possible to keep the bias stable over the entire temperature range, allowing the engineer to "dial in" much more bias than a conventional Class A/B amplifier. This is one of the key elements to the amazingly transparent sound of the Signature Editions.

The key to running this much bias is thermal management. The Signature Edition features a unique heatsink design that mounts a 4-inch fan in the center of the PCB to force cool air in a cross-flow pattern over a solid, finned heatsink before expelling it at the ends. This design minimizes the impact of installation location on the amplifier's thermal performance. Mounting the Signature Edition upside down, under or behind a seat, or under a panel will achieve the same performance.

To further improve dynamics and efficiency, the Signature Edition amplifier uses only stiffly regulated, fully isolated power supplies. The regulation not only improves the damping factor and overall control of an amplifier, but also eliminates any effects of voltage drops in the load system.
  • hand-selected Sanken power amplifier transistors
  • uncompromising construction
  • temperature controlled bias for minimum distortion at any temperature
  • hard regulated, microprocessor controlled power supply with automatic switching from HighVoltage to HighCurrent at low load.
  • temperature controlled fan
  • damping factor >1000
  • HP/LP/BP switchable on all channels from 30-5500 Hz, 12/24 dB/oct switchable
  • BassBoost adjustable 20-80Hz and 0-15 dB
  • separate gain controls for left/right
  • Input select switch
  • Symmetrical inputs via 8-pin Western connector
  • illuminated ARC logo in 256 freely selectable colors
  • SubLevel control included (for 4-channel freely assignable)

Features:

  • 2-channel amplifier
  • 4 channels @ 4 ohms: 65 Watts
  • 4 channels @ 2 ohms: 110 Watts
  • 2 channels @ 4 ohms (bridged): 220 Watts
  • 2 Channels @ 2 ohms (Bridged): 145 Watts
  • Frequency Response: 4Hz - 100kHz
  • Crossover Range: 30Hz - 500Hz
  • Crossover Range X10: 300Hz - 5500kHz
  • Bass Boost: 0 - 15dB @ 20Hz - 80Hz
  • S/N Ratio: 93dB
  • Input Sensitivity (Low): .3V - 4V
  • Input Sensitivity (Bal): .4V - 8V
  • Max current draw: 79A @ 540 Watts 20% THD
  • Idle Current: 3 Amps
  • Fuse: 2 x 40 Amps
  • Dimensions: 205 x 65 x 390 mm

Regular price €1.149,00

inkl. MwSt., zzgl. Versand

1 piece
5% discount at: Payment in advance, PayPal
Delivery time: 1-3 days