Double Trouble Kit

About the Double Trouble Kit

The GR Research Double OB Servo Subs consist of two 12" SW-12-16FR woofers mounted in an open baffle (OB) configuration, powered by the A370PEQ servo amplifier. These subs use a patented Direct Servo technology that monitors driver position with a custom sensing coil and adjusts the amplifier feedback loop to maintain accurate cone movement matching the input signal. This results in extremely low distortion, fast settling times, and highly detailed, tuneful bass down to 20Hz. The open baffle design benefits from the servo control to overcome typical early roll-off and limited low-frequency output of standard OB drivers. The system is popular for stereo use as vertical towers or can be laid on their side for mono playback. Recommended cabinet designs include H or W frame open baffle structures. The subs include Neutrik Speakon connectors for easy amplifier disconnection and weigh about 43 lbs each with dimensions approximately 21 x 17 x 17 inches. They are well suited for audiophiles seeking high resolution and fast bass response, especially in dipole or infinite baffle applications.