Ground Zero GZA 125.4-30A amplifier

4-channel amplifier, 4 x 125 W RMS (4 Ω) / 2 x 250 W RMS (2 Ω), class AB, BIAS adjustment, SQ components, Hi-Res, limited edition
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Zesilovač Ground Zero GZA 125.4-30A

A limited edition for Ground Zero's 30th anniversary presents the flagship four-channel amplifier GZA 125.4-30A, based on the EISA-awarded Ground Zero GZUA 4SQ. The manufacturer upgraded all key components, creating a true gem for sound lovers seeking absolute reproduction fidelity. The massive heatsink with a black piano-lacquer finish and gold details looks elegant and underlines the exclusivity of the edition. The real marvel, however, is inside — from premium components to a carefully engineered circuit concept. The amplifier is built on a proven Class A/B topology with adjustable BIAS, allowing behavior close to Class A. Ground Zero deliberately omitted all filters and minimized the number of active components in the signal path to achieve maximum purity and detail. The use of OPA2134 op-amps, premium MUNDORF® capacitors, and separate power rails for the preamp and power stages ensures not only excellent dynamics but also absolute silence in the background. The result is an amplifier that becomes both a collector’s item and an audiophile tool for the most demanding listening sessions.

Limitovaná edice k 30letému výročí Ground Zero

In 1995 Felix Lautner founded Ground Zero near Munich, and over three decades the brand has grown into one of the global leaders in car audio. To mark the 30th anniversary, a special edition was created as a symbolic thank-you to fans and collectors. This limited series includes three carefully selected products: the four-channel amplifier GZA 125.4-30A, the two-way component system GZC 165-30A and the subwoofer GZW 12-30A. Each offers unique technical features available only in this edition and is distinguished by an exclusive black-and-gold finish. Ground Zero focuses on quality and collectible value rather than mass production — that is why the most popular amplifier configuration, the widely used 165 mm speaker size and a 12" subwoofer were chosen, together forming a perfectly balanced core system. The edition sits in the higher price segment alongside the Hydrogen and Uranium series, but includes a range of exclusive improvements and details prepared specifically to celebrate this special anniversary.

Hlavní vlastnosti

Limited edition for Ground Zero's 30th anniversary.
Four-channel amplifier with Class A/B topology and adjustable BIAS.
Frequency range 5–70,000 Hz for high-resolution (Hi-Res) playback.
Filterless design for maximum fidelity and sonic purity.
OPA2134 op-amps with extremely low noise.
Premium audio capacitors MUNDORF® and high-quality output transistors.
Separate power rails for the preamp and power stage.
Optimized power-up with timed delay.
Gold-plated terminals for flawless signal transfer.
Massive heatsink in black piano lacquer with gold details.

O značce

Ground Zero Audio is a globally recognized car audio brand founded in 1995 in Germany. Since its inception it has built a strong market position thanks to cutting-edge technologies, precise engineering and a focus on sound quality. Ground Zero specializes in complete car audio solutions, from premium car speakers and powerful subwoofers to amplifiers designed for either SPL or SQ. Ground Zero products are known for their durability, high performance and faithful music reproduction, as confirmed by numerous awards from prestigious international competitions in Sound Quality (SQ) and Sound Pressure Level (SPL). The manufacturer uses state-of-the-art technologies in development, such as the KLIPPEL® measurement system and CEA 2006-A standards, to ensure maximum accuracy and reliability of each component. With the slogan "Respect The Music," Ground Zero Audio emphasizes its philosophy — to offer listeners an authentic musical experience that faithfully captures the emotion of every track. If you are looking for top-tier solutions, car speakers or subwoofers that excel not only in performance but also in build quality, Ground Zero Audio is the right choice for demanding customers worldwide. Ahifi is the exclusive importer of Ground Zero for the Czech and Slovak Republics.