The tweeters of some component systems are available separately in pairs.
In addition, GROUND ZERO offers a wide range of high-quality models, which can be used in a customized sound quality setup.
The models of the COMPETITION line are particularly suitable for installations whose purpose is to achieve very high levels.

Ultra Series


After collecting detailed experience in SQ performance and general in-car audio reproduction for more than 25 years during the development of loudspeakers, subwoofers and amplifiers for highly demanding customers and having launched a wide range of car audio products used for sound quality competitions all over the world, GROUND ZERO had started to take advantage of all these gathered skills devising a very new and super high-end product line. For the most sophisticated demands, GROUND ZERO introduces an extraordinary two-channel amplifier and matching loudspeakers now! REFERENCE ULTRA series products are developed by highly attentive engineers from England, Sweden and Germany creating products for the most demanding customers without accepting any compromise in overall quality and SQ performance.



Ultra-high-end 30 mm / 1.18″ tweeter

Reference Series

Pure High-End Sound Quality

The EISA awarded REFERENCE components obtain the highest attention and care during a long lasting development.
Without any compromise, each component is selected from the best ones available on the market.
Highest production quality and the most accurate supervision of every single part ensure not less than perfect performance, ultimate sound quality and workmanship for the highest demanding customer.
Emphasizing the high-end status of the REFERENCE products, each amplifier, speaker and subwoofer is finally certified by GROUND ZERO´s in-house quality department and delivered in a classy, logo-branded wooden box handmade in Germany.

GZPT Reference 28EVO

32120011: 28 mm / 1.1″ high end tweeter

GZPT Reference 28 Gold Edition

32120020: 28 mm / 1.1″ high end tweeter – Gold Edition

Plutonium Series

High-End Experience

The products of the PLUTONIUM line are suitable for either ultimate SPL level or high-end sound quality. To achieve one of these targets, exceptional materials and technologies are applied during the development.
The technical, electrical and mechanical skills of the resulting products convince not only during worldwide SPL competitions but also High End enthusiasts with outstanding audio reproduction ability.
Starting from the market release, the subwoofers have set benchmarks in all SPL competitions around the world and have been awarded for best performance by numerous test magazines.

GZPT 28SX Chrome Edition

32121011: 28 mm / 1.1″ high end tweeter – Chrome Edition


32121012: 28 mm / 1.1″ high end tweeter

Nuclear Series

Ultimate Performance

With several particular features of the High End PLUTONIUM line, GROUND ZERO managed to position the NUCLEAR line products at a lower price level. Nevertheless, the amazingly sounding speakers are partly “Made in Germany”.
The subwoofers are predestined for high level audio setups as well as for SPL competition while massive multi-channel and impressively powerful mono amplifiers deliver excellent performance.


32122120: 28 mm / 1.1″ silk dome tweeter and coupled chamber

Uranium Series

Amazing Sound Quality

Each product of the URANIUM line-up has been developed carefully to fulfill the demands of music enthusiasts with high audiophile expectations at a reasonable price level.
Applying all of Ground Zero´s sound quality competition experience while tuning the product details carefully, results in emotional and amazing audio reproduction.
The distinguished amplifiers point out the main purpose by their designation: SQ beyond the average!


32123013: 28 mm / 1.1″ silk dome tweeter

Hydrogen Series

High-Grade Technology

Products of the HYDROGEN series match with the demands of highly sophisticated customers.
Amazing performance, great sound quality and high SPL whenever required.
The subwoofers have been developed to handle a huge amount of input power reaching extremely high bass levels, to be used successfully even under competition conditions.
A matching 2-way component speaker system and a number of MINI amplifiers with compact dimensions for limited installation space complete this famous GROUND ZERO line-up.


32124020: 25 mm / 1″ silk dome tweeter

Radioactive Series

Advanced Dynamics

The RADIOACTIVE line offers a wide range of exceptional high efficient speakers and subwoofers for daily and SPL use. During the development GROUND ZERO focused especially on natural and dynamical audio reproduction of digitally compressed music.
Apart from some powerful amplifiers, the line contains extremely small amplifiers for limited space environments.


32125011: 25 mm / 1″ coated silk dome tweeter

Titanium Series

Premium Quality

The products of the TITANIUM line combine premium quality and high efficiency.
A wide range of dedicated speakers meet most of the customer´s need.
The amplifiers are equipped with sophisticated technology and encased by a posh heatsink with brushed titanium color surface.
Especially for trucks, GROUND ZERO offers two models of the TITANIUM amplifier line-up as a 24-Volt version.


32126010: 20 mm / 0.79″ silk dome tweeter

Competition Series

Realistic Stage Atmosphere

The experience of a real concert atmosphere or club feeling needs professional high SPL levels to be achieved.
This however, requires very special and powerful speakers as well as amplifiers. GROUND ZERO´s development department doesn´t make any compromise,
whenever the purpose of the product is that clear. Because of this, a COMPETITION product is the right choice for demanding customers with high SPL level expectations.


32128110: 25 mm / 1″ high power silk dome tweeter


32128121: High-performance 25 mm / 1″ dome tweeter


32128122: High-performance 28 mm / 1.1″ dome tweeter

GZCT 0500X

32128305: 25 mm / 1″ aluminum dome compression tweeter


32128306: 25 mm / 1″ aluminum dome compression tweeter

GZCT 3000X

32128330: 38 mm / 1.5″ aluminum dome compression tweeter

GZCT 3500X-S

32128350: 25 mm / 1″ aluminum dome compression tweeter

GZCT 3500X-B

32128351: 25 mm / 1″ aluminum dome compression tweeter

GZCT 4000X

32128400: 44.5 mm / 1.75″ aluminum dome compression tweeter


32128500: 44.5 mm / 1.75″ titanium dome compression tweeter


32128501: 44.5 mm / 1.75″ titanium dome compression tweeter

Competition Pro Series

The PRO Series

The COMPETITION PRO series marks the very top level of electrically and mechanically possible power handling, nowadays.
These drivers have been designed especially for long distance open show and demonstration performances at very high SPL level as well as
for the more and more popular “Pancadão” open-air stages featuring a wall of speakers, a competition trend coming from Brazil.

Ground Zero Audio Produktkategorie Lautsprecher Komponenten Ground Zero Audio Produktkategorie subwoofer


32128222: 25 mm / 1″ high end compression tweeter with neodymium motor


32128224: 25 mm / 1″ high end compression tweeter with neodymium motor

Car Specific Series

CAR SPECIFIC Upgrade for the OEM sound system

Most OEM speaker systems cannot completely satisfy the expectations of sophisticated customers. Especially the basic equipment leaves a lot of space for improvements of dynamics and sound quality.
Installing car specific aftermarket speakers is a simple way to enhance the audio system.
GROUND ZERO´s line of CAR SPECIFIC solutions consists of various components designed for upgrading the OEM audio systems of modern cars easily.


41230040: Car specific 25 mm / 1″ tweeter


41830040: 25 mm / 1″ tweeter