In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. The Atlas Jumbo Bass AJB250/SM4 is a solid top bass that takes advantage of the bold Breedlove bass bracing system featuring the JLD Bridge Truss system. This highly resonant and full sounding bass also features a solid Sitka Spruce top, Magohany back and sides, Fishman electronics and more. The versatile jumbo extra-deep body sounds great acoustically and is ready to plug in and play out!