X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier

Balanced Class-D Monoblock Power Amplifier

13 reviews

  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier
  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier
  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier
  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier
  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier
  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier
  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier
  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier
  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier
  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier
  • X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier

X Series Stealth PA-1 Balanced Class-D Monoblock Power Amplifier

Balanced Class-D Monoblock Power Amplifier

13 reviews

The Stealth PA-1 is a discontinued product. If you are looking for a powerful monoblock power amplifier, please check out the XPA-DR1 Differential Reference Monoblock or the XPA HC-1 High Current Monoblock.
  • The X Series Stealth PA-1 is a high performance balanced Class-D monoblock power amplifier. The PA-1 combines compact size, high efficiency, and excellent sound quality in a single convenient package.

    The Stealth PA-1 is the ideal solution anywhere a small great sounding monoblock power amplifier is needed. Use one to power a center channel speaker, use a full set to power your entire home theater system, or use several of them to add extra channels to your current audio system.  Each PA-1 delivers 140 watts RMS into 8 Ohms, or 300 watts RMS into 4 Ohms. They are cool running and only require minimal ventilation. Because it’s so small, the PA-1 monoblock fits conveniently on any shelf, and rack mount kits are available to mount a single PA-1, or a pair of them side by side, in a single 1U rack space.

    Not only does the Stealth PA-1 sound great, but it’s also simple to configure and use. The PA-1 runs on any line voltage between 100 VAC and 264 VAC, accepts a balanced input using either an XLR or balanced 1/4” connector, and can be configured to remain on continuously or to automatically switch itself on when it detects an incoming audio signal. Comprehensive protection circuitry protects the PA-1 from a variety of faults, without intruding on the quality of your music during normal operation, and automatically resets itself once the fault is removed.

    Stealth Series: Designed For The Studio; But Great For Studio Or Home

    All of the components in our Emotiva X Series Stealth line were designed from the ground up with the demanding requirements of a professional recording studio in mind. All of our Stealth components incorporate the rugged construction, rock-solid engineering, and outstanding technical performance demanded by professionals. However, because we designed them to deliver true audiophile sound quality, they’re right at home in either a home studio or a high-end home theater or stereo audio system.

    Stealth Quality

    The Stealth PA-1 monoblock power amp is built to last, with a heavy duty steel chassis, solid milled aluminum faceplate, and high-quality parts and construction throughout. The high performance ICEpower module, which incorporates virtually all of the active circuitry in the PA-1, including the amplifier section and integral SMPS power supply, has a proven track record of performance and reliability. We expect you to enjoy your PA-1 for a long time – and we back that up with a full five-year warranty.

    Designed and Assembled in the USA

    All of our new PA-1 amplifiers are designed, assembled, and tested in the USA. Designing and assembling in the USA with globally sourced components gives us exceptional control over every facet of the design and production process, which helps us build the highest quality products for our customers while minimizing unnecessary complications and production delays. Each Emotiva amplifier is carefully designed with premium components to deliver a stunningly capable, reliable, and refined system.

  • Great Sound Quality And Outstanding Technical Performance

    • The Stealth PA-1 was designed to deliver both great technical performance and true audiophile sound quality in a variety of audio applications.

    • The proven Class-D technology of the ICEpower 300ASC Class-D amplifier module, and other modules in the ICEpower family, has been in widespread use in a variety of high-end audiophile applications for several years, and has a track record of delivering both superb sound quality and excellent reliability.

    • The Stealth PA-1 is rated to drive any load between 4 Ohms and 8 Ohms with ease, and can deliver even more power into loads as low as 2.7 Ohms, so it can drive virtually any loudspeaker or passive subwoofer with ease.

    Flexible Connection And Control Options

    • The combination input on the Stealth PA-1 accepts both XLR and 1/4” balanced input connections. The PA-1 can also be operated from any unbalanced input source with the addition of a simple low-cost passive adapter..

    • Heavy duty gold-plated five-way speaker binding posts with clear shields allow you to use a wide range of speaker cables with bare wires, lugs, or banana plugs.

    • AC power can be switched manually, allowing the Stealth PA-1 to be controlled by an ordinary switched power strip. The PA-1 can also be configured to turn on automatically when it detects an incoming audio signal.

    Advanced Engineering

    • The ICEpower 300ASC module used in the PA-1 includes its own built-in, high performance, switch mode power supply for optimum performance and reliability.

    • The output voltage of the PA-1 is continually monitored and adjusted by a servo circuit to ensure a very low DC offset voltage at the speaker terminals.

    Convenient Form Factor And Minimal Cooling Requirements

    • The small form factor makes the Stealth PA-1 an ideal choice where space is at a premium. The Stealth PA-1 fits easily in a wide variety of locations, and mounting kits are available to mount either a single Stealth PA-1, or a pair of units side by side, in a single 1U rack space.

    • High efficiency, cool operation, and minimal cooling requirements allow you to use the PA-1 in a variety of locations where space and clearance are at a premium.

    Simple AC Power Requirements

    • The Stealth PA-1 automatically detects and operates on any AC line voltage from 
100 VAC to 264 VAC at 50 Hz or 60 Hz.

    • The standard IEC power inlet on the Stealth PA-1 fits all standard commercial and audiophile IEC power cables.

    Bulletproof Protection

    • The Stealth PA-1 continuously monitors its operating temperature, and scans for fault conditions like shorted connections and invalid input signals. If a fault is detected, the PA-1 will mute its output until the fault is removed. The status is updated every few seconds and, as soon as the fault is removed, the PA-1 will automatically return to normal operation.

    • Our full five year warranty ensures that you’ll be able to enjoy your Stealth PA-1 for years to come.

    Quality Construction

    • Top quality parts and construction throughout for years of reliable trouble-free  service.

    • Heavy steel chassis with milled aluminum faceplate offers strength and rugged good looks.

    • Solid machined gold-plated RCA input connectors provide a reliable connection with a wide variety of audio interconnects.

    • Designed, assembled, and tested in the U.S.A. at our plant here in Franklin, Tennessee

  • Circuit Topology

    • The Emotiva Stealth PA-1 Class-D Monoblock Power Amplifier is a fully balanced high-performance Class D power amplifier featuring the ICEpower ASC300 amplifier module. The ICEpower ASC300 is self-contained, and includes an audiophile-grade Class D power amplifier, and an integral high-performance switch mode power supply.

    • The Stealth PA-1 combines a very small form factor, high efficiency, minimal cooling requirements, and near-bulletproof protection, all in a convenient and economical package.

    Audio Specifications

    • Channels: 1

    • Output power:    

      140 watts RMS into 8 Ohms at 1 kHz at 1% THD;
      135 watts RMS into 8 Ohms at 0.1% THD.

      300 watts RMS into 4 Ohms at 1 kHz at 1% THD;
      270 watts RMS into 4 Ohms at 0.1% THD. 

      450 watts RMS into 2.7 Ohms at 1 kHz at 1% THD

    • Input impedance: 47k Ohms (balanced).

    • Voltage gain: 28 dB

    • Full power bandwidth: 20 Hz to 20 kHz.

    • THD+N: 0.005% at 1 kHz at 1 watt into 4 Ohms.

    • S/N ratio:

      Referenced to 1 watt (A-weighted): 91 dB.

      Referenced to full output (A-weighted): 112 dB.

    • Frequency response: 20 Hz to 20 kHz +/- 1 dB (worst case; 4 Ohm load).

    • Damping factor: >500

    • Rated load: From 2.5 Ohms to 8 Ohms.

    Input And Output Connections

    • Input Connections: Balanced; (accepts XLR, balanced ¼”, unbalanced ¼”).

    • Speaker Output Connections: Audiophile grade 5-way binding posts.

    • Trigger:

      The Stealth PA-1 can be configured to turn on when an audio signal is detected.

    Power Requirements

    • Anywhere between 100 VAC and 264 VAC @ 50 / 60 Hz (automatically detected).

    • Standby power: Approximately 0.275 watts.

    • Total power efficiency: Approximately 80%.

    Front Panel Controls and Indicators

    • Power LED: Illuminates blue when the PA-1 is On.

    Rear Panel Controls

    • AC Power switch: Rocker switch (switches AC main power).

    • Auto/On Switch: 

      In the On position, AC power to the PA-1 is controlled by the AC Power switch.

      In the Auto position, the PA-1 switches on automatically when audio is detected.


    • The Stealth PA-1 is protected against excessive temperature, short circuit conditions, excessive DC offset at the output, and various input signal fault conditions. The protection circuitry in the PA-1 is totally transparent in normal operation. If a fault is detected, the PA-1 will instantly mute its output, and continue to monitor the situation. As soon as the fault is removed, the PA-1 will automatically reset itself and return to normal operation.


    • Dimensions:

      8-1/2” wide x 1-7/8” high x 9” deep (unboxed, including feet, not including connectors).

      8-1/2” wide x 1-3/4” high x 9” deep (unboxed, without feet).

    • Weight: 3 lbs (unboxed) 6 lbs (boxed)


    Download Product Manual

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Customer Reviews
4.8 Based on 13 Reviews
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Filter Reviews:
Wonderful, musical amps

I was looking for cool running, efficient but musical mono amps. Reading some rave reviews convinced me to take the plunge. A pair of these, together with a XSP-1 gen 2, are driving NHT 2.5i towers. In short, after two weeks, I love the sound that I’m getting! The pairing is letting the NHTs do what they do best, with digital and analogue sources, against a nice black background. The NHTs are quite revealing and will show whatever is upstream in the audio chain. They also like some power, and dip to 3.6Ω. The Emotiva combo is making them sing.

Wayne T.

Great little amplifier to use for surround channels. Very happy with performance and very easy to place due to size and weight.

Performs great

I got this to drive my C-2 center and it performs great. I currently have an aging LPA-1 and just wanted a nice upgrade that would be under warranty. Then these popped up in the factory renewed sale; immediately I bought two more to drive my T-1 towers. These with my MC-700 will be awesome especially once I recalibrate everything.

Eugenio H.
Awesome performance

I connected with my 140watts rms klipsch rc-62ii. Fuller sound Powerful And super clean Planning to purchase another two for my rf-62ii main speakers

Stephen P.
Jaw dropping

Though I’d read a few reviews, I was not prepared for what I heard, straight out of the box. Totally blown away, I was. Soundstage was enlarged, bringing me closer to the music. I felt like I stole high end for the price of a decent dac. Highly recommended!!

*All reviews have been incentivized