I don't know but I had a B&K ST-202 which is the same design as the 140 just more powerful with another set of FETS. I upgraded to a Crown XLS 1500 class D drivecore amp and love it. The old B&K is an excellent amp so it depends on what your driving and your own ears too. The mono blocks should be an upgrade but with a S/N of about 97db for the B&K's and 103db for the higher power and flat clean response Crown at the same price or less you should check them out. I wouldn't try to drive particularly efficient speakers with any of them but they all should sound great under about 100db. The higher damping factor and power of the crown just seems to bend the drivers of my old NHT 3.3's to its will.
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