[BMW-Specific UPGRADE B-100XT] Coaxial 2-Way Trade-In Speakers for Refining Sound Clarity with a Direct Replacement

From the BMW OEM speakers, you want a bit more definition in the sound. You’d like to make vocals easier to hear. While avoiding major modifications, you want to enjoy your everyday music comfortably.

That’s exactly what the BMW-dedicated UPGRADE B-100XT is for.

A coaxial 2-way trade-in system designed for installation on the inside of the door trim, such as E82, E88, E90, E91, E84, and more. It is engineered with replacement of the factory speakers in mind, and wiring can be connected via OEM plug-and-play couplers. If you want to step up the sound while keeping the overall cabin atmosphere largely unchanged—and making use of the factory system—this is an easy speaker to consider.

Make OEM audio a little easier to listen to

The midrange uses a 100mm paper cone. It shapes the mid-band—vocals, guitar, piano, and other elements that form the core of music—toward a more resolving presentation than the OEM speakers.

The tweeter is a 19mm silk dome. Rather than making the high frequencies hard and sharp, its design helps create a more natural sense of spread. Even with the music you normally listen to, you should be able to follow the vocal placement and fine instrument details more easily, aiming for sound that’s less fatiguing during long drives.

For those who feel the OEM speaker sound is a bit muffled, or who feel that even after turning the volume up, the finer details still get buried, there’s also an approach that starts with a speaker replacement.

A model that makes it easier to plan a BMW-cabin-appropriate upgrade

UPGRADE B-100XT is a trade-in type that installs using the original speaker positions in compatible vehicles. Because it connects with OEM plug-and-play, you can consider the upgrade while minimizing wiring work on the vehicle side.

However, even among BMWs, speaker configurations and mounting conditions may differ depending on model year, grade, and the specifications of the factory audio system. Even if the vehicle is included in the compatible lineup, it’s important to choose after confirming the exact vehicle specifications.

Also, speaker replacement isn’t the end of the story. The overall impression of the finished sound can change depending on the mounting condition on the door side, surrounding vibrations, and the compatibility with the OEM system. If it were me, I’d first confirm the vehicle condition and the music you usually listen to, then decide whether to proceed with the speakers alone, or to include a dedicated high-pass filter and processing on the door side as well.

If you want to further organize the low end

An optional 10cm midrange high-pass filter UG B-100X HP is also available.

By organizing the low-frequency playback range, it may help reduce the load on the midrange and make it easier to adjust how cohesive the sound feels. However, the best configuration varies depending on the OEM audio specifications and the balance of the entire vehicle—so adding it doesn’t necessarily guarantee a better result.

If you want to fine-tune sound within a reasonable scope based on BMW OEM audio, please tell us your vehicle model, grade, and your current impression of the sound. While checking the actual vehicle and how you use it, we’ll think together about only the necessary parts.

■ Main Specifications

【Basic Information】
Product name: BMW-Specific Coaxial 2-Way Trade-In System UPGRADE B-100XT
Type: Coaxial 2-Way Trade-In Speakers
Compatible vehicles: E82 / E88 / E90 / E91 / E84, etc.
Mounting location: Inside door trim

【Speaker Configuration】
Tweeter: 19mm silk dome
Tweeter magnetic circuit: Neodymium magnet
Midrange: 100mm paper cone
Midrange magnetic circuit: Ferrite magnet

【Performance】
Frequency response: 100–25KHz
Sensitivity: 88dB / 1m
Impedance: 4Ω
Max input: 100W
Minimum resonance frequency: 70Hz

【Installation / Connection】
Midrange mounting depth: 35mm
Wiring: OEM plug-and-play
Passive crossover: Built-in tweeter-dedicated high-pass filter

【Optional Extras (Sold Separately)】
10cm midrange high-pass filter
UG B-100X HP: 1 pair

If you’re considering replacing your BMW OEM speakers but you’re unsure how far to go, we’ll guide you while confirming your vehicle specifications and what you want to achieve. Let’s finish your BMW in a reasonable way that lets you enjoy the music.