GPSS-650: Can I use speaker with battery removed? Yes, your GPSS-650 will work with the battery removed and the power switch flipped to the ON position. Product: GPSS-650 Related articles [XGA SERIES] How to setup / troubleshoot an amp? GPSS-650: Can the GPSS-650 be used for karaoke parties? GPSS-650: Can it handle outboard floor pedals such as chorus, phasor, compression/sustain?