Grimm Audio LS1s Subwoofer

Most subwoofers add bass. The Grimm Audio LS1s adds a third way to one of the most phase-accurate loudspeaker systems ever built. A pair of LS1s subwoofers slots beneath the LS1 speakers between their support legs, using the crossover already inside the LS1's DSP to create a unified three-way system with linear response down to 20 Hz. No external processor, no setup, no compromise to the LS1's time-domain precision.

Key Features of the Grimm Audio LS1s

• Phase-Coherent Three-Way Extension: The LS1 already contains a phase-corrected crossover at 70 Hz. Adding the LS1s activates it, creating a three-way system with no phase discontinuity at the crossover point.
• Linear to 20 Hz: A top-grade Peerless woofer driven by a 400W Hypex nCore Class D amplifier delivers flat response through the bottom octave.
• DSP-Controlled Frequency Curve: The LS1s frequency response is shaped by the LS1's internal DSP, ensuring the sub and main drivers behave as a unified system.
• Fits Beneath the LS1: The upward-firing woofer sits between the LS1's legs, maintaining correct speaker height and placement while adding deep bass.
• Flexible Positioning: The LS1s can be removed from the footplate and placed at the optimal position for bass reproduction, independent of the main speaker location.
• IEC Pass-Through: A mains outlet on the LS1s powers the LS1 above it, reducing cable clutter to one power cord per channel.

Why the Bottom Octave Matters

The LS1 on its own reaches 40 Hz with impressive authority. But the octave between 20 Hz and 40 Hz contains the foundation of orchestral music, the room tone of live recordings, and the weight of electronic bass that defines modern production. Classical listeners will hear the hall itself. Engineers checking mixes at higher SPL will appreciate the reduced distortion that comes from offloading deep bass duties to a dedicated driver.

Intelligent Integration

At low frequencies, wavelengths are large enough that driver orientation becomes irrelevant. Grimm exploited this by positioning the LS1s woofer upward-firing, which transfers minimal vibration energy into the LS1's support legs. Short cables between the units carry both signal and power. The entire assembly, LS1 speaker sitting atop LS1s sub, operates as one integrated system controlled by a single DSP. For even greater bass performance with motional feedback correction, consider the Grimm Audio SB1, which uses a piezoelectric sensor to actively measure and correct cone movement.

Explore the Full Grimm Audio System

The LS1s is designed for the LS1c, LS1v2, and LS1a loudspeakers. Pair with the MU1 or MU2 streamer for a complete Grimm Audio system. The LS1r Controller adds volume and source switching from the listening position.

The Listening Room Difference

We're a third-generation family business with a brick-and-mortar showroom in Chestertown, Maryland, and a reputation built on exceptional service and relentless passion for hifi. Whether you're visiting in person or ordering online, we bring decades of experience, personalized service, and honest guidance to every interaction. We don't just ship boxes. We help build systems, answer your questions like real humans, and make sure every detail of your setup is right, from the cables to the final connection. Our passion is helping you get the most out of your gear, with support that lasts well beyond the sale.

Grimm Audio LS1s Specifications