Breedlove’s Atlas Series contains a number of different basses, including the ABJ250/SM4, which is made with Breedlove’s jumbo body (seventeen inch lower bout, along with five inch body depth at the tail block and a four inch body depth at the heel) with a soft cutaway. The top is solid sitka spruce, whereas the sides/back are made out of mahogany. The combination of sitka spruce and mahogany results in a deep, mellow, sound.
Additionally, this acoustic bass guitar produces decent volume as a result of the large jumbo body (not to mention the JLD bridge truss system – one of the few acoustic bass guitars with one installed at the factory). One of the biggest complaints about acoustic bass guitars is that they lack the volume needed to play without an amplifier. The ABJ250/SM isn’t loud by any means, but the volume is sufficient to play unplugged along with perhaps two or three other guitars/mandolins/banjos, but with more than that the bass would be overpowered.
What I really like about this acoustic bass guitar is it’s clear note separation. I even used a plectrum and did a little bluegrass flatpicking and, although you might expect a garbled wall of bass, the notes came through cleanly.
Features of the ABJ250/SM4 [http://www.macnichol.com/mm5/merchant.mvc?Screen=PROD&Store_Code=MGAM&Product_Code=ABJ250_SM4&Category_Code=Jumbo] include a hardshell case, rosewood fingerboard and bridge, pearl position markers, satin finish, Tusq nut and saddle, JLD bridge truss, Fishman Classic IV Pickup with bass-optimized E.Q., chrome Grover tuners, satin finish, and an abalone rosette with black border.