For sure, the open back Bassman eventually evolved into the Super Reverb with a lot of modifications. They were terrible bass amps, but until the Ampeg B-15 hit the market in 1960 that was the only game in town. It's apocryphal that modern the 4x10 bass cabinet was in partI think its also important to point out that the first Bassman's were a 410 combo amp, not just a head. Those are the ones guitar players used to go nuts over. As an under-speakered, open back cab, they were not very good for bass.
Inspired by Leo's original 4x10 Bassman. plus a lot of innovation in speaker technology and cabinet design. Leo went back to a single 1x15 Bassman combo once Jensen developed a more robust 15" Bass musical instrument speaker. Just my take however. Probably the most important improvements in bass amp technology were the JBL D-130F, the JBL D-140F, K-140, and E-140. The Bassman tone stack didn't change much. They did continually upgrade the power section. Once the Sun 200s, SVT, and eventually the Acoustic 360/361 the Bassman was relegated to lounge bands at Holiday and Ramada inns again just my take.
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