GROUND ZERO GZUB 8BR Uranium Series Vented Subwoofer Owner’s Manual

: June 5, 2024
: Ground-Zero

Table of Contents

Features
Introduction
URANIUM Series – Amazing Sound Quality
General installation note
Safety instructions
Terms of warranty
Specifications and dimensions
Enclosure specifications
Frequency response
Power handling
Wiring options
Verified with KLIPPEL®
Respect the Music
Customer Service
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

GROUND ZERO GZUB 8BR Uranium Series Vented Subwoofer Owner’s Manual

Features

High quality vented subwoofer
Solid enclosure from MDF
Airflow optimised ventilation
8” URANIUM subwoofer
Resonance-free aluminum cast basket
2” copper voice coil
GZ push terminal

Introduction

Thank you for choosing a great GROUND ZERO product! We hope you will enjoy this product from the URANIUM series. This owner´s manual contains information you need to use this product. Please read it carefully in order to achieve the best possible result. Your car audio specialist or our customer support will answer further questions about the product and its use. Subwoofers are an important part of your car audio system. Please keep in mind, however, that they can only achieve their full performance if all other components of the entire system are carefully coordinated with one another. It is therefore recommended consulting a car audio specialist dealer or workshop for the assembly of the system and its installation and sound adjustments.

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. All the distinguished amplifiers of the line point out the main purpose by their designation: SQ beyond the average!

General installation note

Never drill a hole to the vehicle´s gas tank or brake lines, to wirings or any other important vehicle parts!
Never pass wires over sharp edges or vehicle parts to avoid any kind of damage
Keep the wiring away from the antenna and electronic devices contributing to radio reception
Lay the power supply wiring always separated from speaker wiring to avoid disturbance
Use adequately dimensioned power and speaker wires to connect the components

Safety instructions

Safety instructions : Keep all parts of the content and the packaging away from children and pets to avoid accidents and the risk of suffocation. Permanently extreme levels of over 85 dB can lead to irreparable damage to the hearing. Music systems with high amplifier output power can reach levels of 130 dB or more. Extreme levels can also hinder the perception of important traffic noises and distract from what is happening on the road. Ground Zero GmbH and its sales partners expressly assume no responsibility for hearing damage, physical damage or any damage to property or consequential damage resulting from improper or careless use or improper installation of its products. In particular, any claims are forfeited through the use under competitive conditions.

Manufacturer’s declaration : Hereby, Ground Zero GmbH declares that this product conforms to the rules of the following EU directives (including all applicable changes): 2011/65 / EU RoHS2 and 2001/95 / EC directive on general product safety. The full text of the EU declaration of conformity is available at www.ground zero-audio.com. Loudspeakers contain magnetized metals and some valuable raw materials and must not be disposed of with normal household waste. Please leave defective or no longer required

Terms of warranty

The limited warranty for this product is covered by GROUND ZERO´s regional distribution partners and their terms and conditions. For further information contact your local retailer or distributor.

Specifications and dimensions

Subwoofer GZUW 8SQ-D2 (UB edition)
Diameter 20 cm / 8“
Voice coil Ø 50 mm / 2″
Impedance 2x 2 Ohm / ohms Xmax 20 mm / 0.79″
Power handling 300 Watt / Watts
Rec. amplifier power 200 – 400 Watt / Watts (RMS) (@ 4 oder / or @ 1 Ohm)

Enclosure specifications

Net volume 20.5 Liter netto / 0.72 cu.ft. net
Ventilation port 1 x 7 cm / 1 x 2.76”
Port length * 34 cm / 13.39”
Tuning frequency (Fb) 40 Hz
Roll-off frequency (F3) 33 Hz
Width 430 mm / 16.93“
Height 250 mm / 9.84“
Depth 318 mm / 12.52“
Back wall angle 78

Frequency response

Graph
frequency response with low pass filter @ 80 Hz / 12 dB/oct

Power handling

Wiring options

Parallel wiring with one mono amplifier @ !Ω load

Wiring options

Serial wiring with one mono amplifier @ 4Ω load
Wiring options

Verified with KLIPPEL®

GROUND ZERO is using the worldwide accepted KLIPPEL® R&D Analyzer KA3 measurement system for speaker development during the German in-house development as well as for QC reporting for most production lines at the factory. The results of LPM and LSI measurements are the basis for evaluating and verifying further development enabling to offer perfectly working products in any practical application. Continuous and advanced trainings for development employees ensure the highest possible qualification.

The Linear Parameter Measurement (LPM) module of the KLIPPEL® Analyzer System is dedicated to identifying the electrical and mechanical small signal (Thiele/Small) parameters of electro-dynamical transducers with high accuracy. It is based on the electrical impedance by measuring the voltage and current at the speaker terminals. An additional benefit of the displacement measurement is the identification the suspension creep parameters, resulting in better accuracy of the loudspeaker model at low frequencies. The LPM provides tools to identify and avoid typical problems such as poor signal to noise ratio and malfunction due to nonlinear effects of the driver or amplifier limiting.

The Large Signal Identification (LSI) module measures the linear, nonlinear and thermal parameters of transducers operated in free air. The transducer is operated under normal working conditions (vertical position and fixed clamped in a laser stand or enclosure). Starting in the small signal domain, the amplitude is gradually increased up to limits admissible for the particular transducer. The maximal amplitude is determined automatically using the identified transducer parameters and general protection parameters describing the thermal and mechanical load. The identification of the model parameters is performed in real time with an adaptive system. It is based on the estimation of the back EMF from the voltage U(t) and current signal I(t) measured at the electrical terminals. The identified model allows locating the sources of the nonlinear distortion and their contribution to the radiated sound. The dynamic generation of a DC-part in the displacement, amplitude compression and other nonlinear effects can be investigated in detail. After the initial identification, a temporal parameter variation and long-term thermal effects can be investigated.

KLIPPEL® R&D hardware and dB-Lab software for LPM/LSI measurements meet the following standards:
Consumer Electronics Association

CEA-2031(LSI module)
International Electrotechnical Commission

IEC 60268-5, IEC 60268-7, IEC 60268-22, IEC 62458,
IEC 62459, IEC WD 63034
BS EN 54-24

Audio Engineering Society
AES2

Institute of Electrical and Electronics Engineers
IEEE 269, IEEE 1206, IEEE 1329, IEEE 1652

Respect the Music

Listening to music can be emotional, impressive, relaxing or enjoyable. At that, it doesn´t really matter what kind of music is the personal favorite, whether it´s Instrumental, Jazz, Electro, Latin, Classic, Rock or any other music direction. However, audio reproduction quality at each desired volume is elementary. Some music styles require higher levels while others prefer the soft tones. GROUND ZERO considers all the different wishes of customers during the development of new products. Along with this, the target is to create the most realistic sound, to transfer the soul of the music and the intention of the performer. Summarized to one phrase: RESPECT THE MUSIC!