Ground Zero Ultra A-2 2-Channel Amplifier

450 Watt

Ultra A-2

Technical Highlights

Power at 4Ω: 2x 200 Watts RMS, at 2Ω: 2x 330 Watts RMS.
Power at 1Ω: 2x 450 Watts RMS, bridged 1200 Watts at 2Ω.
Signal-to-noise ratio >120 dB, frequency response 10 Hz–80 kHz.
More technical details

€5.995,00

~~€5.995,00~~ €5.995,00

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Datasheet

Ground Zero-Ultra A-2-2-Kanal Verstärker-masori-kaufen

€5.995,00

~~€5.995,00~~ €5.995,00

The Ultra A-2 from Ground Zero is an Ultra-High-End 2-Channel Amplifier with a symmetrical design. The technical features include a high-quality Swiss-made ELMA selector switch and exclusively manufactured MUNDORF audio capacitors. The device has rhodium-plated RCA sockets and an LED-lit Plexiglas base plate. There are two levels for the BIAS adjustment and four levels for the input sensitivity to choose from. Signal processing occurs without potentiometers and OPAs for a direct signal path. Additionally, the amplifier is prepared for optional water cooling.

Features

2-Channel Amplifier
Symmetrical design
Swiss-made High-End ELMA selector switch
2-stage selection for BIAS adjustment
4-stage selection for input sensitivity
Potentiometer-less and OPA-less signal path
Rhodium-plated RCA sockets
MUNDORF audio capacitors
Plexiglas base with LED lighting
Prepared for water cooling

Technical Specifications

Output power at 4 Ohm: 2x 200 Watts RMS
Output power at 2 Ohm: 2x 330 Watts RMS
Output power at 1 Ohm: 2x 450 Watts RMS
Output power at 2 Ohm bridged: 1200 Watts
Signal-to-Noise: over 120 dB
Frequency response: 10 Hz – 80 kHz
Width: 250 mm
Length: 502 mm
Height: 80 mm

Häufige Fragen zum Ultra A-2

How does the symmetrical design of the Ultra A-2 enhance your sound experience?

The Ultra A-2 from Ground Zero features a symmetrical design, allowing for a very pure and detailed sound image. Especially if you enjoy listening to music at high volumes, you'll notice that every nuance of your favorite songs comes through clearly, without distortion or unwanted background noise. Thanks to the precise signal routing, highs remain clear and mids balanced, enabling you to discern every facet of your sound system. For instance, if you use car audio tweeters or high-end car tweeters, their sound characteristics are particularly well represented. The components are optimally matched, so each instrument and voice shines in its own space. Additionally, the symmetrical design contributes to a high signal-to-noise performance of over 120 dB. This allows you to enjoy absolute silence in quiet passages while the sound envelops you during loud playback. The result: Pure harmony across the entire frequency spectrum.

What special features does the Swiss ELMA switch offer in the Ultra A-2?

The ELMA switch from Switzerland is a true hallmark of quality and underscores the high-end aspirations of the Ultra A-2 amplifier. With this switch, you can toggle between different settings without relying on potentiometers. This keeps the signal path particularly low in contaminants and clean, resulting in a noticeably improved sound. ELMA stands for fine mechanical precision, ensuring that the choice between sensitivity or BIAS levels is always safe and reliable. With each setting, you experience a consistent sound level without the risk of disruptive transition resistances or loose contacts. This switch is a true highlight for audiophiles who do not want to compromise on sound quality. Thanks to its robust construction, you can be sure that the ELMA switch will function reliably for a long time and consistently deliver the desired sound profile.

What are the two BIAS settings for in the Ultra A-2?

The BIAS settings on the Ultra A-2 allow you to finely tune the amplifier's operating mode. "BIAS" refers to the basic bias voltage of the power amplifier, and Ground Zero has intentionally integrated two different levels here. If you prefer a warmer, slightly tube-like sound, you can set the BIAS higher. This becomes particularly interesting if you value sonic nuances and are looking for a very emotional sound. The second level is excellent if you prefer a cooler, more analytical reproduction – the amplifier remains cooler overall and can deliver its high output power of up to 1200 watts bridged at 2 Ω. Especially with high-quality high-end car tweeters or Ring Radiator Tweeters, you can adjust your sound profile to personal preference through these BIAS settings. Additionally, the flexible adjustment ensures that you have more control over the entire frequency range and can fully exploit your system's maximum potential.

How does the fourfold input sensitivity of the Ultra A-2 work?

The four-stage input sensitivity of the Ultra A-2 allows you to precisely match different preamplifier or head unit output levels. You can choose exactly where your music source should drive the amplifier to avoid distortion and to unfold the sound as best as possible. This fine-tuning process ensures that the full signal bandwidth is preserved and the frequencies—from 10 Hz up to 80 kHz—are reproduced as faithfully as possible. Whether you use a classic car radio, a modern multimedia receiver, or a dedicated DSP, the right input sensitivity is crucial for your sound to be not only loud but also clean and dynamic. Especially with delicate highs, such as when working with car audio tweeters, you will appreciate the clarity achieved through this versatile sensitivity adjustment. This allows you to achieve a fine and contemporary sound tuning.

What is the impact of omitting potentiometers and OPAs in the Ultra A-2?

The Ultra A-2 consistently forgoes potentiometers and operational amplifiers (OPAs) and instead relies on a direct signal path. This means that even the smallest sound information is transmitted through the electronics without being distorted by additional components. Especially if you want to perceive your music in a very nuanced way, this aspect plays an important role. By avoiding analog control elements like potentiometers, potential sources of wear or noise are eliminated, allowing for a more stable and precise playback in the long run. The OPAs, which are commonly found in many standard amplifiers, have also been omitted here to create the most puristic chain possible. The result is an almost uncolored sound, which is particularly advantageous for dynamic details and brilliant highs, for example, when driving high-end car tweeters. With this design choice, you retain a sound that is realized without technical compromises.

How does the optional water cooling support the performance of the Ultra A-2?

The option for water cooling is intended for anyone who wants to squeeze the most out of their Ultra A-2. Especially if you often drive high volumes or push the sound level to the limit, the thermal load on an amplifier can become extreme. With the separately available water cooling, the waste heat can be efficiently dissipated. This means more stable amplifier temperatures and therefore less risk of thermal limitations or automatically reduced power. If you often host elaborate music sessions in your vehicle and simultaneously drive high-quality Ring Radiator Tweeters, powerful mid-bass drivers, and subwoofers, the current flow can quickly rise. With water cooling, performance remains at a top level for longer periods because the components do not overheat. At the same time, this cooling increases the longevity of your amplifier, so you will enjoy your Ultra A-2 for a long time.

What role do the rhodium-plated RCA jacks play for the sound?

Rhodium is a highly corrosion-resistant precious metal that also keeps resistance low at contact points while being durable. When you use the rhodium-plated RCA inputs on the Ultra A-2, you benefit from a clean signal transfer. Especially with high-resolution music, inferior contact surfaces can cause interference, which can result in a loss of clarity or dynamics. The rhodium coating significantly minimizes such influences, allowing you to hear even the fine high frequencies and spatial details of your music precisely. Whether you want to enjoy delicate acoustic passages or prefer energetic bass, the rhodium-plated connections ensure consistent performance. This allows the Ultra A-2 to unleash its full potential, especially in conjunction with well-constructed speaker systems. In combination with exclusive MUNDORF® audio capacitors, tonal nuances are preserved just as the artist intended.

How do you integrate the Ultra A-2 when you want to get the best out of your high-end speakers?

If you plan to integrate the Ultra A-2 in your car and maximize the potential of high-quality speakers, it is advisable to first optimally choose the frequency crossover between the amplifier and the speakers. Especially if you like to use high-end car tweeters or even Ring Radiator Tweeters, the clear and uncolored reproduction of the highs is crucial. Make sure to set the input sensitivity appropriately and use the BIAS levels to adjust the sound character to your preferences. Midrange drivers and subwoofers benefit from the high output power of the amplifier, as they have enough reserves for dynamic music passages. A good example would be if you want to make every detail audible in acoustic music while still needing enough punch for energetic rock tracks or electronic beats. The direct signal path without OPAs eliminates sound-altering elements, allowing you very precise fine-tuning. This way, you get exactly the sound that excites you.

Is the Ultra A-2 from Ground Zero compatible with common European vehicles like BMW, Audi, Mercedes, or VW?

The Ultra A-2 is universally designed and can therefore generally be installed in various European car brands, including BMW, Audi, Mercedes, or VW. However, you should ensure that there is enough space for the dimensions of 250 x 502 x 80 mm and size the power supply accordingly. This is especially important if you want to fully utilize the high output power at 1 Ω (2 x 450 Watts RMS). A stable wiring setup is essential for the amplifier to transmit the music signals without distortion. Especially with components like car audio tweeters or powerful mid-bass drivers, a well-thought-out concept is important to avoid overloading the vehicle's protection circuits. So pay attention to proper fusing, cable cross-sections, and professional installation to ensure lasting enjoyment of this high-end amplifier.

How does the LED-lit acrylic base plate contribute to the premium look?

The LED-lit acrylic base plate gives the Ultra A-2 a very appealing and modern look. When you present your system in the evening or in a darker environment, the illuminated interior of the amplifier stands out particularly well. You can almost feel the aesthetics as you become aware of your unique technology. The elaborate components, such as the MUNDORF® audio capacitors made exclusively for Ground Zero, are highlighted by the light and immediately show that high-end quality is present. It is primarily a visual delight if you place great value on design and want to make your car audio setup a real eye-catcher. This way, you not only combine excellent audio performance but also create a wow effect as soon as you showcase your sound project. The acrylic base plate also allows you to see the symmetrical structure and the premium connection components, further enhancing the feeling of quality.

Manufacturer information / responsible person

Ground Zero GmbH
Erlenweg 25
85658 Egmating, Germany

Tel +49 (0)8095 873 830

E-Mail: info@ground-zero-audio.com

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