【GROUND ZERO GZ-GZIC 650FX | 16.5cm Separate 2-Way Speakers with Slim Design for Enjoyable Sound Changes】

You want to replace your OEM speakers, but you’re concerned about the depth inside the door and the mounting space.

If that’s you, we recommend considering GROUND ZERO GZ-GZIC 650FX.

Although it’s a separate 2-way speaker in the 16.5cm class, the woofer mounting depth is 44mm. Even in vehicle models where you normally need to check the depth, the slim design may make installation possible.

Of course, the shape and mounting conditions of OEM speakers vary depending on the vehicle model. Whether it can be installed in practice and how much modification will be required will be determined by checking the actual car.

For those who want to refine the sound’s outline from OEM speakers

The GZ-GZIC 650FX is a separate 2-way configuration paired with a 19mm silk dome tweeter.

In terms of sound changes, it’s designed to make vocal and instrument positions easier to understand, and to organize and clarify the small details that can sound muffled with OEM speakers.

It’s a good fit not only for those who listen to the radio or music during commuting, but also for anyone who wants to enjoy the songs they usually listen to a little more comfortably.

Instead of changing the sound too dramatically, you may want something that’s easier to listen to for long periods without fatigue—something that works well in everyday use. If that’s what you’re looking for, I think this is a speaker that’s easy to consider.

Supports tweeter adjustment

The included network provides a function to adjust the tweeter sensitivity to -3dB / 0dB.

Inside the car, even with the same speaker, the way high frequencies are heard changes depending on the mounting position and glass reflections. Because you can adjust between wanting strong high-end output and wanting a calmer balance, it’s a configuration that’s easy to match to how it sounds in your specific car.

Also, depending on your system setup, it can support bi-amp connections. Install the speakers first with the OEM head unit, and if you plan to add an amplifier or DSP in the future, it’s a model that’s easy to think about in terms of long-term expandability.

Sound changes depending on the installation method

A speaker doesn’t automatically sound better just because you replace the product.

How sound comes together varies based on things like the way it’s fixed to the door, the mounting base, wiring treatment, tweeter orientation, and how it’s paired with the OEM head unit.

Especially with slim speakers, while they tend to be advantageous in terms of depth, you still need to confirm the mounting hole size and the mounting method depending on the vehicle. Forcing the installation can affect not only sound quality but also interference inside the door and the overall finish.

At Logon, we don’t decide based solely on the specifications of the speaker itself. We consider an appropriate, no-stress configuration together while looking at the vehicle model, the condition of the OEM audio, the music you normally listen to, and future system upgrades.

If it were me, I would first confirm what you’re dissatisfied with in your current sound and how much you want to change it, and then choose including the installation method. That way, you’re less likely to have things change later compared to deciding without checking the actual car.

Suitable for people like these

• OEM speaker sound sounds muffled
• You want vocals to be a bit easier to hear
• You want high-frequency clarity, but want to avoid harsh sound
• You’re concerned about the depth inside the door
• You want to replace speakers while taking advantage of the OEM head unit
• You’re also considering adding an amplifier or DSP in the future
• You want to consult about sound tuning and the final finish after installation

GROUND ZERO GZ-GZIC 650FX is a speaker that’s easy to consider both for installability thanks to its slim design and for the sound spread unique to separate 2-way speakers.

However, the best choice varies depending on the vehicle model and the OEM system. If you want to confirm things including whether it can be installed and what modifications may be necessary, as well as how it differs from other speakers, let’s decide the direction together while looking at the condition of your vehicle.

This is a model I’d strongly recommend for anyone who wants to enjoy their everyday music a little more carefully—even inside the car.

Key Specifications / Specs

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[Basic Information]
Product name: GZ-GZIC 650FX
Brand: GROUND ZERO
Type: 16.5cm Separate 2-Way Component Speakers

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[Performance]
Max input: 140W
Rated input: 100W
Nominal impedance: 4Ω
Frequency response: 50Hz–20kHz
Sensitivity: 90dB

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[Speaker Configuration]
Tweeter: 19mm Silk Dome
Magnet: Neodymium

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[Mounting]
Cutout diameter: 142.5mm (woofer)
Mounting depth: 44mm (woofer)
Grille size: 178×24mm

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[Connections / Functions]
Network: Included
Tweeter sensitivity adjustment: -3dB / 0dB
Bi-amp connection: Supported

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• Compiled based on publicly available manufacturer information.
• Whether it can be installed and what modifications may be required vary depending on vehicle model, model year, and OEM audio specifications.