X4 Nanobass: Mobile Sound Built Better Players who demand more from their practice amp will find the X4 Nanobass multi-instrument combo amplifier by Phil Jones Bass more than delivers masterful portability without compromising on tone and flexible features. While the X4 Nanobass is made for premium bass tones, it is also optimized for more instruments, including electric guitar, ukulele, and electronic drums. Weighing in at approximately five pounds, the X4 Nanobass fits into luggage or backpacks and can easily be carried by hand. A proprietary four-inch speaker delivers up to 35 watts of power, outperforming many similarly sized amplifiers. Players can opt for near-silent solo practice volumes, beefy output for group practice with others, or something in between, along with Bluetooth and auxiliary options for track playback from a laptop, iPad, smartphone, or another device. More than anything, bassists at Sweetwater admire the X4 Nanobass' upscale build quality and sound.