Arc Audio

Arc Audio


Exclusive Automotive, Motorcycle and Marine audio products designed in the USA by leading in-house audio engineers for every level of audiophile, enthusiasts or general music lover.

Arc Audio 2150se Sale
Arc Audio 2150se

Previous Demo. Works Flawlessly.  Complete including box


Signature Edition by Robert Zeff is our no compromise, high-power, audiophile amplifier designed and engineered by Robert Zeff and the staff at Nikola Engineering. This design is taken from Robert's many years of experience in both professional and the car audio industries where he used, repaired, and built high power, high fidelity amplifiers almost every day. With these lessons well learned over 30 years, he finally had the opportunity to make for ARC Audio the no compromise, no limits amplifier he had always dreamt of.

Signature Edition is a High 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 one 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 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 output transistors are on at the same time. The more bias you add the better it sounds.

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 performance across a wide temperature range. This stability allows us to "dial-in" much more bias than any 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 four-inch fan mounted in the center of the circuit board. The fan forces cool air in a cross-flow pattern through the massive finned heat sink before exhausting 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 always perform as intended.

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.



2- Channels @ 4 Ohms
150 Watts
2-Channels @ 2 Ohms
300 Watts
1-Channel @ 4 Ohms (Bridged)
600 Watts
1-Channel @ 2-Ohms (Bridge)
600 Watts
Frequency Response
7Hz - 50kHz
Crossover Range
30Hz - 500Hz
Crossover Range X10
300Hz - 5500Hz
Bass Boost
0 - 15dB @ 20Hz - 80Hz
S/N Ratio
Input Sensitivity (Low)
.3V - 4V
Input Sensitivity (Bal)
.4V - 8V
Max Current Draw
222A @ 1800 Watts 20% THD
Idle Current
1.14 Amp
2 x 40 Amp
15.5"(L) x 8.0"(W)x2.5"(H)
$ 1,479.99 $ 600.00
Arc Audio X2 850.5 Multi Channel Amplifier - Previous Demo Unit Sale
Arc Audio X2 850.5 Multi Channel Amplifier - Previous Demo Unit
Perfect working condition, Excellent cosmetic condition. 
Comes with a Bass knob and Hi level input pigtails

One amplifier running an entire system without compromise to sound quality of overall performance? Yes, it's true! Robert Zeff has done it again with a single package solution designed to run your speakers and subwoofers from a single, compact amplifier.

The X2 850.5 is a compact and elegant design that is small enough to fit just about anywhere in a vehicle allowing you that personalized musical experience without the loss of valuable storage space.

Capable of delivering 85 watts to each of the four main channels, the X2 850.5 provides enough power and dynamics to satisfy most audio enthusiasts without straining or reaching the limits of the amplifier design. Old school "Grunt" but with next-century technology and miniaturization, this isn't your everyday Class-D amplifier.

Not a fan of the silver top cover finish and want the black hairline finish found on the X2  Amplifier Series? No problem. All Level 1 X2 amps can be upgraded with the Level 2 XDi cosmetic shroud kit. Simply purchase the XDi Trim Kit that suits your needs and drop it right on the X2 amplifier (Note that the XDi trim kits only come with the illuminated XDi badge. The X2 illuminated badge is not available at this time).

  • Multi-Channel Amplifier (5-Channels)
  • Microprocessor Class-D Design
  • Designed And Engineered By Robert Zeff
  • High-Frequency Power Supply Design For Improved Signal Transparency And Overall Sound Quality)
  • Level 1 X2 Cosmetics Package - Texture Coated Stamped Steel Cosmetic Cover With Aluminum Logo Badge. (Changeable to Level-2 XDi Cosmetics)
  • Single Side Connection Design
  • Full-Range Design
  • Nickel-Plated RCA Terminals
  • Quick Disconnect Speaker Terminal Plugs
  • Audiophile Class-D Output Filter Networks
  • Detailed Micro Processor Controlled Protection
  • Large, High-Frequency Switching Power Supplies
  • RCA Inputs Are Compatible With Speaker Level Inputs
  • Fault Codes Storage Of The Last Protection Code Detected
  • High Signal To Noise Ratio Without Compromising Power Output
  • Fully Balanced Input Stage Significantly Increases Flexibility
  • Ultra-Low ESR, High-capacity Power Supply Storage Capacitors
  • Flexible Mounting Orientation For Vertical Or Horizontal Installations
  • Next-Generation High-Speed Class-D Technology Powering All XDi Amplifiers.
  • Bridged Mode Auto Detect Turn-On Works With Most Chip Based OEM Head Units
  • Precision Filtering Isolates The Power Supply Reducing Unwanted Interference In Radio Reception
  • Block Type Terminal Connections

4-Channels @ 4 Ohms (Ch 1-4) 85 Watts
4-Channels @ 2 Ohms (Ch 1 - 4) 125 Watts
2-Channel @ 4 Ohms (Ch 1-4 Bridged) 250 Watts
1-Channel @ 4 Ohms (Ch 5) 225 Watts
1-Channel @ 2-Ohms (Ch 5) 400 Watts
Frequency Response 10Hz - 20kHz
Crossover Range (Ch 1-4) 50Hz - 550Hz
Crossover Range (Ch 5) 30Hz - 230Hz
Bandpass Capable No
Bass Boost Variable 0-12 dB @ 45Hz
Cosmetic Trim X2 Trim Level 1
Remote Level Control Included Yes
Input Sensitivity (Low) 200mV - 3.5V
Fuse 3 x 30 Amp
Dimensions 12.42"(L) x 6.268"(W)x2.162"(H)
$ 769.00 $ 375.00

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