dB Technologies SUB 615 Active Subwoofer

Active 15" Subwoofer for Compact PA Systems

The dB Technologies SUB 615 is a bass-reflex active subwoofer for portable PA systems where clean low-end extension matters more than cabinet size. A 15" transducer paired with a 600 W RMS Class D SMPS amplifier delivers up to 131 dB SPL while keeping usable bandwidth flat from 42 Hz to 124 Hz. This model anchors a 2.1 PA without external processing.

Built-In Crossover and DSP Eliminate Outboard Gear

The unit includes a 28/56-bit DSP with RMS, peak, and thermal limiters plus a switchable stereo crossover feeding two balanced XLR outputs to full-range tops. A Sub Mode switch adds low-frequency boost, and polarity inversion helps tame phase issues. The plywood cabinet with full metal grille keeps the unit at 25.5 kg — light enough for one-person load-in.

Amplification and SPL Performance

The Class D amplifier module with switch-mode power supply drives this model's high output-to-weight ratio.

• Amplifier Type: Class D SMPS — efficient, lightweight, cool-running
• Power: 600 W RMS / 1200 W peak — sustained output with headroom for bass peaks
• Max SPL: 131 dB — enough for clubs and outdoor gigs

Low-Frequency Driver and Bandwidth

The 15" woofer with 2.5" voice coil sits in a bass-reflex enclosure tuned for tight, articulate low end.

• LF Driver: 15" with 2.5" voice coil — standard portable PA bass
• Frequency Range: 42 Hz - 124 Hz — reaches sub-bass territory
• Enclosure: Bass-reflex plywood — road-ready housing

Inputs, Outputs, and Cabinet Dimensions

Balanced XLR connectivity makes the unit straightforward to integrate with mixers and active tops. The M20 pole mount accepts standard distance rods, and a 25.5 kg weight keeps transport manageable.

• Inputs: Balanced XLR — two channels for mono or stereo feed
• Outputs: 2x XLR balanced — link to tops with or without crossover engaged
• Pole Mount / Cabinet: M20, 430 x 580 x 600 mm, 25.5 kg — compact, single-operator load-in