【GZIB 25BR｜Bass-Reflex Woofer Box with 25cm Subwoofer】

When you listen to music in your car, do you ever think, “I want a bit more depth in the bass,” or “The low notes are weak, and the whole song feels light”?

GZIB 25BR is a complete bass-reflex woofer box featuring a 25cm, 4Ω SVC subwoofer unit. By adding low frequencies that are difficult to make up with the front speakers alone, it’s easier to bring out the presence of the bass and kick drum, giving the music overall a fuller, richer feel.

It’s not just about making the bass louder—it's important to fine-tune it with the connection to the front speakers in mind. If the low end is too strong, vocals and mid/high frequencies can get buried. So, we look at the balance between quantity and cohesion, tailored to your vehicle model, your current audio system, and the music you usually listen to.

The unit uses an HQPP cone with a 3D honeycomb structure, a POLYCOT spider, and a 50mm voice coil. In addition, the bass-reflex box is built with Ground Zero’s unique base-tunnel design, making it an ideal setup for those who want to enjoy bass properly.

The side of the box is equipped with a 12-gauge nickel-plated speaker terminal that also supports banana plugs. It’s easy to connect and disconnect, and the specification is designed to make installation in the vehicle—and future system changes—easier to plan.

A subwoofer isn’t something that’s “finished” just by placing the product. The way it sounds will vary even with the same product, depending on the installation location and mounting method, the combination with the amplifier, and crossover and level adjustments. At LOGON, we work together to create a natural sound where only the bass doesn’t stand out—while checking your current system and how you use your car.

For those who want impact but don’t want “boomy” bass, you can first let us hear your current sound, and then discuss whether the GZIB 25BR will suit you. If you’re considering adding bass, please consult us with your vehicle model and your current audio configuration.

■ Main Specifications

【Basic Information】
Product name: GZIB 25BR
Type: Bass-Reflex Woofer Box
Unit size: 25cm
Impedance: 4Ω
Voice coil: 50mm
Voice coil configuration: SVC

【Unit / Box】
Cone: HQPP cone with 3D honeycomb structure
Spider: POLYCOT spider
Box type: Bass-reflex type with base-tunnel design

【Terminals】
Speaker terminal: 12-gauge, nickel-plated
Compatible terminals: Banana plug compatible