User Manual for Ground Zero GZHK 165 Midwoofer

Quick guide from the manual

This document provides essential installation and technical information for the Ground Zero GZHK 165 midwoofer. Always prioritize safety during installation to avoid damaging vehicle components or causing hearing loss. Ensure all wiring is routed correctly to prevent interference and damage.

Installation notes

• Safety first: Never drill holes into the vehicle's gas tank, brake lines, or other critical vehicle parts.
• Wiring protection: Do not route cables over sharp edges that could cause damage.
• Interference prevention: Keep signal and speaker cables away from antenna electronics and antenna cables to maintain radio reception quality.
• Power separation: Always route power supply wiring separately from speaker wiring to avoid electrical disturbance.
• Wiring quality: Use adequately dimensioned power and speaker wires to connect the components.

Safety instructions

Keep all parts and packaging away from children and pets to avoid suffocation risks. Be aware that prolonged exposure to volume levels over 85 dB can cause irreparable hearing damage. High-power amplifier systems can reach levels of 130 dB or more, which may also hinder the perception of important traffic noises.

Technical specifications

• Model: GZHK 165
• Voice Coil: 2-layer 38 mm CCA
• Magnet: Y35 Ferrite
• Cone Material: Non-pressed paper
• Impedance: 4 Ohms
• Frequency Response: 40 Hz – 5000 Hz
• Power Handling (Nominal/Max): 120 / 180 Watts
• Outer Diameter: 165 mm
• Mounting Diameter: 144 mm
• Mounting Depth: 69 mm

Noise damping

Thin surfaces and panels in the vehicle interior can vibrate when playing music, causing unwanted booming. To reduce this, it is recommended to use sound-absorbing materials such as aluminum-butyl or self-adhesive aluminum plates. These materials increase the mass of the panels, changing their natural resonance and significantly reducing noise levels.