JOHSON 100R Stage Series 100 Acoustic Similar to the JA-050-A this amplifier gives you great reproduction of acoustic instruments. But we added a larger amplifier and increased the woofer to a 10" speaker to give you better low-end response, and of course more volume. 60 watts RMS; 120 watts peak power Independent gain & volume levels 10" Woofer; 2" Tweeter Notch Filter with Sweepable Frequency 2-band EQ Special Acoustic EQ Wave-Shaper One 1/4" Input jack, Line Out.