ADAM Audio Sub2100 Active Studio Subwoofer, 21.5-Inch Flagship

ADAM Audio Sub2100: Flagship 21.5-Inch Sub-Bass to 18 Hz

The ADAM Audio Sub2100 is a flagship active studio subwoofer built around a massive 21.5-inch woofer with the world's largest 6-inch voice coil, driven by a 1000 W continuous amplifier for extension down to 18 Hz. With linear SPL peaks of 128 dB or more and 99 dB/W/m efficiency, it delivers the deepest, most effortless low end in ADAM Audio's subwoofer line. This is a sub for large control rooms and mastering suites where the bottom octave has to be felt as much as heard. When nothing less than reference-grade full extension will do, the Sub2100 is the ultimate low-frequency anchor.

21.5-Inch Woofer and 6-Inch Voice Coil

The Sub2100's defining feature is a 21.5-inch woofer fitted with a 6-inch voice coil, described by ADAM Audio as the largest in the world, in a bass-reflex enclosure. A cone of this diameter displaces an immense volume of air, which is the only way to reproduce the very lowest frequencies at high level without the driver reaching its excursion limit. The oversized 6-inch voice coil handles enormous power and dissipates heat, keeping the cone in firm control and distortion low even at extreme output. That scale is what lets the sub reach truly subterranean depth while staying tight and articulate.

Extension to 18 Hz and Bass-Reflex Design

The Sub2100 extends down to 18 Hz, below the nominal threshold of human hearing, in a ported bass-reflex enclosure. The port reinforces the driver's deepest output near the cabinet's tuning frequency, extending usable low end and efficiency beyond what a sealed box of similar size could achieve. Reaching 18 Hz means the sub reproduces the fundamentals of pipe organ, synth sub-bass and cinematic low-frequency effects that most systems only hint at. In a mastering suite, that reach lets an engineer make confident decisions about energy in a region other rooms cannot even reproduce.

1000-Watt Amplifier and 99 dB Efficiency

A 1000 W continuous (1200 W music) amplifier drives the Sub2100 to linear SPL peaks of 128 dB or more, aided by exceptionally high 99 dB/W/m efficiency. High sensitivity means the driver converts amplifier power into acoustic output very effectively, so the sub reaches reference levels with headroom in reserve rather than straining. That reserve preserves the dynamics of transient low-frequency events, which are exactly the moments compressed systems flatten. The pairing of a powerful amplifier and a highly efficient driver is what gives the Sub2100 its uncompressed, effortless character.

Flexible I/O for High-End Systems

The Sub2100 provides balanced XLR and unbalanced RCA inputs and outputs with satellite loop-through for integration into large, high-end monitoring chains. In a bass-managed system the sub reproduces the deepest lows and passes the remaining spectrum to the main monitors, so each speaker handles the range it does best. Balanced XLR connections keep the signal quiet and interference-free across the long cable runs a large mastering room demands. That connectivity lets the Sub2100 anchor stereo, multichannel and immersive systems at the highest level.

Who the Sub2100 Is For

The Sub2100 is built for deep sub-bass in large control rooms, mastering suites requiring full extension, immersive and cinematic monitoring, and high-SPL reference systems. It is the choice for facilities where the lowest octave must be reproduced accurately and at level, not merely suggested. Mastering engineers, film and immersive audio professionals, and high-end studios are its natural owners. When the room and the standard are at the top of the profession, the Sub2100 is the flagship sub built to match.