Edifier R2750DB MKII Teardown Analysis

The Edifier R2750DB MKII is a large active 2.0 bookshelf speaker system featuring a digital three-way architecture, HDMI eARC, and Bluetooth 6.0. According to a review and teardown by Igor's Lab, the system uses six separately amplified channels to drive its drivers, delivering a composed sound, though its 7-inch woofers cannot fully reproduce the lowest octave without a subwoofer.

Each speaker enclosure measures approximately 223 by 395 by 280 millimeters, with the pair weighing 16.57 kilograms. The reviewer cautions that the speakers appear more compact in product images than they are in person, advising potential buyers to measure their intended placement area.

Internal Design and Amplification

A teardown found the system uses one active enclosure that sends three separately amplified signal pairs to the second, passive speaker. The inter-speaker cable is therefore a purpose-specific multi-conductor connection, not a standard two-conductor speaker wire.

The active crossover is implemented digitally within the power amplifiers. The review found no separate large audio DSP, multichannel DAC, or passive three-way crossover in the second enclosure.

The mainboard in the reviewed sample was revision A-AU6815P-02-V1.0, with a manufacturing date of November 2025. The power supply was also dated to the end of that month, indicating the sample was a relatively early production unit.

Four digital Class-D amplifier ICs were identified on the mainboard. The configuration drives a total of six differential speaker outputs.

Twelve SMD output inductors serve the six outputs: eight for the four midrange and tweeter channels and four for the two woofer channels. Additional toroidal common-mode chokes address electromagnetic interference on the speaker lines.

Connectivity and Features

The system is positioned as an all-round active three-way system for music, desktop use, and television playback. It includes analog, optical, coaxial, Bluetooth, and subwoofer outputs, covering typical sources without needing a separate preamplifier or AV receiver.

Its HDMI eARC and CEC behavior provides a more conventional TV-system workflow than an active speaker requiring a separate remote for every volume adjustment. However, the review notes a significant omission: "HDMI eARC is one of the most important new features of the MKII, yet no HDMI cable is included in the carton." The manual explicitly states the cable is not included.

The SUB OUT port provides a largely full-range, low-level signal path, with the external subwoofer expected to provide the actual low-pass filtering.

Build Quality and Accessories

The cabinets use a neatly applied imitation veneer. The reviewer noted the solder side of the circuit board showed visible flux residues, and the thermal contact areas for cooling appeared functional rather than refined. There is no conventional aluminum heatsink; heat travels through the board to a metal plate on the rear panel.

The accessory package includes the power cable, the proprietary inter-speaker cable, an optical Toslink cable, a 3.5-mm stereo jack-to-RCA cable, an adapter with a 3.5-mm jack socket to stereo RCA, a remote control, two AAA batteries, and documentation. The reviewer considered the two analog adapter variants useful but noted the absence of a standard RCA-to-RCA cable.

The front grilles can be fitted and removed, though removal requires some force. The reviewer stated a visual preference for using the speakers without the covers.

Sonic Performance

Listening tests were performed with bass and treble set to neutral. The system remained cohesive at low volume and could play noticeably louder than typical desktop speakers while retaining control. Internal dynamic range control and limiting are present.

Sonically, the review finds the system sits between a warm, indulgent speaker and an uncompromising studio monitor. The bass is controlled and substantial without an exaggerated upper-bass lift. The midrange is clean, neutral to slightly cool, and effective with voices. The treble is smooth and detailed.

Compared with a soundbar, it provides a more mature stereo presentation for music and dialogue but cannot provide surround information. Compared with a larger Hi-Fi system using floorstanding speakers and a subwoofer, it lacks the lowest-octave pressure and ultimate scale.

The reviewer appreciated that Edifier did not disguise the speaker's weight with lifestyle gimmickry, presenting "two fairly classic three-way enclosures." The feet on the reviewed sample left visible marks on wooden furniture, though these were polished away without permanent damage.