Dirac Live Bass Control Dirac Live Bass Control (DLBC)

How Bass Control Differs from Standard Dirac Live

Dirac Live Room Correction calibrates audio systems using proprietary algorithms, but when multiple subwoofers are present, standard Dirac Live treats them as a single grouped unit without applying individual per-subwoofer filters. Dirac Live Bass Control sits atop the base Room Correction license and adds individual filtering, delay, and level adjustment for each subwoofer to manage their acoustic interactions holistically.

This distinction is fundamental: standard Dirac Live will calibrate multiple subwoofers together but will not set individual filters for each unit, limiting its ability to address subwoofer-to-subwoofer phase relationships and crossover blending with full-range speakers.

Technical Approach: Phase Alignment and Filter Design

Bass Control ensures that high-range main channels remain in-phase with subwoofers in the crossover frequency band at a selected "sweet-spot" position in the room. This is achieved primarily by adjusting phase relationships between loudspeakers using low-order all-pass filters and a genetic optimization algorithm to determine optimal crossover points for different speaker groups.

The system separates frequency management into a bass-controlled range (common to all channels) and higher frequencies (unique to each speaker group). Each subwoofer receives tailor-made phase filters, delays, and level gains applied independently, while subwoofers and full-range speakers operate as a unified low-frequency system. This frequency separation strategy allows the bass domain to be optimized globally while preserving tonal balance per channel at higher frequencies.

Bass Control also minimizes seat-to-seat variations at low frequencies by coordinating multiple subwoofers to deliver consistent bass response across the listening area (a key practical advantage in multi-subwoofer setups).

System Requirements and Channel Architecture

Each subwoofer requires its own dedicated logical channel (not a summed mono channel or a Y-split) for Bass Control to operate and apply individual calibration curves. The system works with both single-subwoofer and multi-subwoofer installations, though the practical benefit is greatest in multi-subwoofer configurations. As of Dirac Live 3.0, basic time-alignment and leveling functions for single subwoofers have been folded into standard Room Correction, meaning the added value of a paid Bass Control license for single-sub setups is smaller than for multi-sub systems.

Bass Control requires the base Dirac Live Room Correction license to run; it cannot function as a standalone product.

Bass Control and Dirac Live Active Room Treatment (ART)

Dirac Live Active Room Treatment (ART) and Bass Control are complementary technologies. While Bass Control focuses on automating subwoofer setup and blending bass in the listening area, ART uses patented MIMO technology to coordinate all speakers (including subwoofers) across the 20–150 Hz range to actively manage room-induced resonances. When subwoofers are part of a system, both a Bass Control license and an ART license are required for ART to operate; they work together rather than as alternatives.

Pricing and Implementation Notes

Dirac Live Bass Control is priced at $299 as a standalone add-on to Dirac Live Room Correction. Pricing has evolved over time (previously tiered at $349 for single-sub and $499 for multi-sub configurations, with separate AVR-specific bundle pricing), so current pricing should be verified with Dirac's website.