Subwoofer Ground Zero GZNW 38XMAX-II

Subwoofer Ground Zero GZNW 38XMAX-II

Ground Zero GZNW 38XMAX-II is a 15" subwoofer from the Nuclear series, designed exclusively for competitive SPL applications and extreme loads. With an aluminum cone, 75 mm aluminum voice coil and a seven-layer 12" spider, this subwoofer delivers brutal power, massive excursion and precise control even at extreme sound pressures. Klippel® optimization ensures maximum linearity, while the three-layer long-throw surround and a robust cast-aluminum basket with optimized airflow provide stable and reliable operation under enormous power. Massive push terminals make connecting heavy-gauge cables easy and underscore the competition-ready character of the subwoofer.

Specifics of the Ground Zero Nuclear series

The Nuclear line from Ground Zero offers a balanced combination of premium products for high-quality listening (SQ) and powerful components for competitive high sound-pressure applications (SPL). The series includes precisely engineered component speakers like the GZNK 165SQ-K, which deliver detailed, clean reproduction thanks to technologies such as a Kevlar® cone and ventilated aluminum baskets, as well as extremely powerful long-throw (Xmax) subwoofers with massive magnetic systems built for extreme performance in SPL contests. Nuclear appeals both to audiophiles seeking musical detail and fidelity and to fans of maximum output who demand deep, aggressive bass. By combining Ground Zero’s competition experience, advanced materials and precise tuning, the Nuclear series sets a new standard in its class.

Main features

• 15" high-performance SPL subwoofer.
• Optimized using Klippel®.
• Aluminum cone and dust cap.
• Three-layer long-throw surround.
• Robust cast-aluminum basket with optimized airflow.
• 75 mm / 3" aluminum voice coil.
• Seven-layer 12" spider.
• Massive push terminals for easy wiring.

About the brand

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 through 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 proven by numerous awards at prestigious international competitions in Sound Quality (SQ) and Sound Pressure Level (SPL) categories. The manufacturer employs 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 every component. With the slogan "Respect The Music," Ground Zero Audio emphasizes its philosophy: to provide listeners with an authentic musical experience that faithfully captures the emotion of every track. If you are looking for top-tier car audio solutions, speakers or subwoofers that excel not only in power 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.

Catalog number	GZNW 38XMAX-II
Brand	Ground Zero
Links	Official web presentation
RMS powerThe RMS power of the subwoofer is the constant power of continuous use of the subwoofer. If the power is exceeded for a longer period of time, irreversible damage may occur, or to burn out the voice coil of the subwoofer.	4000 W
Sensitivity (SPL 2.83V/1m)Subwoofer sensitivity or efficiency. The sensitivity of the subwoofer is given in decibels (dB) and, in simple terms, means that the higher the value, the lower the demands on the power of the amplifier. This is a de facto rating of how a subwoofer converts watts to sound. Sensitivity ratings are in noise level measured at 1 meter from the subwoofer using 1 W (watt of power) or using 2.83 volts at the source at 1 meter. A higher decibel level means the subwoofer is louder with less power. For every 3 dB increase in sensitivity, the subwoofer requires half the power to reproduce the same volume. For example, if an 88 dB subwoofer needs 300 Watts to produce a certain volume, then a subwoofer with 91 dB sensitivity needs only 150 Watts to reach the same efficiency.	87 dB
Sensitivity (SPL 1W/1m)Subwoofer sensitivity or efficiency. The sensitivity of the subwoofer is given in decibels (dB) and, in simple terms, means that the higher the value, the lower the demands on the power of the amplifier. This is a de facto rating of how a subwoofer converts watts to sound. Sensitivity ratings are in noise level measured at 1 meter from the subwoofer using 1 W (watt of power) or using 2.83 volts at the source at 1 meter. A higher decibel level means the subwoofer is louder with less power. For every 3 dB increase in sensitivity, the subwoofer requires half the power to reproduce the same volume. For example, if an 88 dB subwoofer needs 300 watts to produce a certain volume, then a 91 dB subwoofer needs only 150 watts to reach the same efficiency.	84 dB
ImpedanceImpedance - measurement of electrical resistance. When buying a subwoofer, it is very important that everyone make sure that the impedance matches the amplifier that you are connecting to it. For subwoofers with a double voice coil, we recommend following the information in the advice center! Example: A 2 Ohm subwoofer cannot be connected to an amplifier that is only stable up to 4 Ohms. A 4 Ohm subwoofer can easily be used on an amplifier that is stable up to 2 Ohms. Connecting a 4 Ohm subwoofer to an amplifier that is stable up to 4 Ohms also without problems. The most common subwoofer impedance is 4 Ohm.	1 + 1 Ω
Subwoofer diameterThe diameter of the subwoofer is indicated on the screw holes. The overall outer diameter of the subwoofer is usually 1-2 cm wider, depending on the size category of the subwoofer. For a 30 cm subwoofer, the outer diameter incl. protective rubber 31.8 cm and in the 25 cm subwoofer it is 26.5 cm incl. protective rubbers.	380 mm (15\")
Subwoofer mounting depthThe mounting depth of the subwoofer is measured from the bottom edge of the magnet to the bottom edge of the subwoofer's metal or cast basket.	300 mm
Recommended bass reflex speaker volumeA bass reflex enclosure is designed in the same way as a closed enclosure, but it also has a so-called bass reflex mouthpiece, or "bass reflex" or slot. Needle foam is used to dampen bass reflex enclosures. USE: The ideal use is in cases where the listener wants to achieve a high volume and a good sound pressure level. It is the best compromise between sound quality and performance and is also the most commonly used Pros and cons: + good efficiency in deep bass + a small deflection of the membrane is enough for a large volume - reproduction less accurate than with closed enclosures	116 l
Fs - resonant frequencyFs - is the lower resonant frequency. This parameter is the de facto free air resonant frequency of the subwoofer. Simply put, it is the point at which the weight of the subwoofer's moving parts equals the force of the subwoofer's suspension while it is in motion. If you've ever seen a piece of string start to hum uncontrollably in the wind, you've seen the effect of reaching a resonant frequency. The weight of the moving parts and the stiffness of the suspension (surround and spider) are key elements that affect the resonant frequency. As a general rule, a lower Fs indicates a subwoofer that would be better at reproducing low frequencies than a subwoofer with a higher Fs. However, this is not always the case, as other important parameters of the subwoofer also enter the resulting sound.	31 Hz
Xmax + -Xmax - the maximum deflection of the subwoofer diaphragm in one direction – it is not a sum, or an abbreviation for the maximum linear deflection. The subwoofer output becomes non-linear as the voice coil begins to leave the magnetic gap.	62 mm
Subwoofer voice coil diameterThe larger the diameter of the voice coil, the more load capacity the subwoofer has, in layman's terms.	75 mm
Subwoofer diaphragm materialThe specific material from which the subwoofer membrane is made.	Aluminum