【UD-K621 (16cm/17cm) Inner Baffle｜For Toyota, Daihatsu, Audi, and VOLVO Vehicles】

Even after replacing the factory speakers, if you feel that “the sound hasn’t changed as much as expected,” “the bass sounds blurry,” or “it sounds like the sound is resonating inside the door,” it’s important to review not only the speaker itself, but also the mounting area.

UD-K621 (16cm/17cm) is an inner baffle used when replacing speakers in Toyota, Daihatsu, Audi, and VOLVO vehicles. By increasing the mounting strength of the door’s metal panel section and firmly securing the speaker, it becomes easier to transmit vibration efficiently as sound.

In addition, the included wave-shaped sound-damping cushion helps reduce sound leakage around the speaker’s rear and suppress unnecessary resonance near the mounting area. It serves as the foundation for bringing out the speaker’s true sound—making vocal contours easier to hear and helping prevent the bass from sounding muddled.

An inner baffle isn’t a part that visibly changes the appearance much, but when replacing speakers, considering the mounting method as well helps stabilize the final result. Even with the same speaker, the required work varies depending on the vehicle model, the condition of the factory door, and whether deadening is done. At LOGON, we guide you with a practical, no-stress configuration while checking your specific vehicle.

If you want “a bit better sound than with the factory speakers” or “to make the most of the benefits of a speaker replacement,” please consult us about the mounting method together with the speaker itself. If I were advising you, I wouldn’t decide only the speaker first—I’d think about the overall setup including baffle and door-side processing.

■ Main Specifications

【Basic Information】

• Product name: UD-K621
• Type: Inner baffle
• Compatible speaker size: 16cm/17cm

【Compatible Vehicles】

• For Toyota vehicles
• For Daihatsu vehicles
• For Audi vehicles
• For VOLVO vehicles

【Included Items】

• Wave-shaped sound-damping cushion

※ Compatibility must be confirmed depending on vehicle model, year, grade, and the shape of the factory speaker.
※ The mounting method and whether additional work is required vary depending on the vehicle condition and the speaker you pair with.