Ground Zero GZULTRAT30 User guide

SAFETY INSTRUCTIONS & MANUFACTURER‘S DECLARATION

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. 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 components to a local

recycling facility at the end of their practical use.

GZ ULTRA T-30 – FEATURES

◦ Ultra-high-end 30 mm / 1.18” soft dome tweeter
◦ Tightly-tolerated technical parameters
◦ Precision-coated textile diaphragm
◦ High-efficient neodymium motor
◦ Vented voice coil former reducing distortion
◦ Lightweight CCA voice coil improving efficiency
◦ Particular dome damping balancing pressure
◦ Machined aluminum chamber with wave diffuser
◦ Flexible lead wires increasing power handling
◦ GZ-design wave-guide face plate
◦ GZ-design mounting ring & NRG-grill
◦ Gold-plated multiway terminal
◦ Documented final technical inspection
◦ Wooden box packaging / in matching pairs

GZ ULTRA T-30 – PARAMETERS

Resonance frequency - fs 500 Hz
Efficiency - SPL >82 dB
DC voice coil resistance - Re 3.4 ohms
Driver´s Q (nonelectrical losses only) - Qms 1.54
Driver´s Q (at fs) - Qes 1.74
Total driver´s Q - Qts 0.82
Air vol. compliant to driver´s suspension - Vas n/a
Moving mass incl. acoustic load - Mms 0.54 g
Product of magnetic flux density - BL 1.83 N/A
Mech. resistance of driver´s suspension - Rms 1.10 kg/s
Compliance of driver´s suspension - Cms 0.19 mm/N
Voice coil inductance - LE 0.015 mH

Aluminum mounting ring & NRG-grill included

GZ ULTRA T-30 – GENERAL SPECIFICATIONS

Speaker type 30 mm / 1.18” soft dome tweeter
Nominal impedance 4 ohms
Frequency Response 1 – 26 kHz
Housing type Machined aluminum
Dome material Soft fabric
Motor High-grade Neodymium
Voice coil diameter 30 mm / 1.18”
Power handling (RMS) 100 Watts
Power handling (max) 150 Watts
Outer diameter 76 mm / 2.99”
Mounting diameter 60 mm / 2.36”
Mounting depth 41 mm / 1.61”

GROUND ZERO is using the worldwide accepted KLIPPEL® R&D Analyzer KA3 measure ment
system for speaker development during the German in-house development as well as for QC
reporting for the production line 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. KLIPPEL® is a registered trademark of KLIPPEL GmbH.

GZ ULTRA T-30

Sound is something very subjective. Everyone perceives it differently because each ear also hears differently.
Consequently, it is hardly possible to predict how the audio playback will be perceived individually. For this reason,

it is difficult to develop a so-called perfect speaker. Rather, the aim of the development is to avoid any error,
no matter how small it could be, caused by the loudspeaker. Above all this, the interaction of several loudspeakers
used for the entire audible frequency range, and even beyond that, with the signal source and the connected power

amplifier is decisive for the result and determines whether the music touches the listener emotionally or not.

In only logical consequence, the GZ ULTRA T-30 tweeter was designed and fine-tuned together with the matching
midwoofer GZ ULTRA K-165 and driven by the extraordinary power amplifier GZ ULTRA A-2 to its final stage ready
to impress the listeners with an outstanding performance when reproducing the upper and highest frequency range

of the audio signal by not less than perfect reproduction without creating any deviations from the original signal.

Not a huge surprise but a great honour, the performance of the GZ ULTRA T-30
and ULTRA K-165 charmed the members of the EISA, a group of international
car audio trade journalists, right from the very first listening sessions that much
that there was any doubt about the decision to award these speakers as simply

“BEST PRODUCT – IN-CAR SPEAKER SYSTEM”