REFERENCE

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.

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Home Audio

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REFERENCE Amplifier

The designation of the REFERENCE 2PURE and 4PURE amplifiers reveal the essential idea behind: Pure Sound Quality! By omitting strictly any kind of signal affecting filter, the result is a completely new and impressing high-end audio performance never heard before.
Only the best components ever have been considered good enough to find their way to the REFERENCE amplifier line-up.
Cooled by a high-quality copper-anodized aluminum heat sink, each model has been equipped with a slightly toned acrylic bottom allowing a glance on the selected components accurately arranged on the discreetly white illuminated and copper-plated double-layer pc board.

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REFERENCE DSP Products

Amplifiers with an ISO harness are easy to integrate into an existing audio system. There is no additional wiring needed. In case the car has a brand-specific connector, the car audio market offers a wide range of adapters to convert OEM head units to the ISO standard.

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REFERENCE Speaker Systems

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REFERENCE Speaker Components

REFERENCE speakers are designed for demanding high-end music lovers. Accurately hand built in Europe, selected in corresponding pairs and delivered in classy wooden boxes. Midbass and midrange speakers are made from hand-coated, pressed paper cones and hand-spooled copper voice coils, inserted into manually machined aluminum parts of the basket, forming the basis for outstanding high-end sound quality. The tweeter features a particularly low resonance frequency. The usable wide frequency range of the hand-coated silk dome thus enables astonishingly spatial and precise audio reproduction.

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Car Specific Products

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REFERENCE Subwoofer

For most accurate bass performance, the unique REFERENCE subwoofer comes with a lot of particular solutions, such as a number of linearization parts added to the magnet system optimizing the impedance and eliminating distortion.
This exceptional subwoofer has been optimized to perform in small enclosures.

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REFERENCE Subwoofer Boxes

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Marine/ATV

Since listening to favorite music isn´t limited to cars, GROUND ZERO offers a particular speaker for environments with special requirements to the construction and water resistance.

A sophisticated RADIOACTIVE MARINE coaxial speaker is available in white finish, suitable for places with high humidity such as bathrooms and pool areas or even for off-shore applications with occasionally appearing direct splashing water such as on outer decks or on leisure boats.

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REFERENCE Accessories

In this category there are crossovers for loudspeakers. These can be used to combine individual components into a passive system.

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REFERENCE Damping

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REFERENCE Headphones

If you would like to enjoy the typical GROUND ZERO sound not only in your vehicle, you may choose one of the two headphones.
Both of them delivering a distinctive bass response and the dynamic sound character.