Prototype – Initially there were 10 prototypes created and tested. Design issues were addressed and noted but the overall quality and performance was good enough to warrant a production model.
V1 – A small batch was made with the design flaws fixed. Most were exported to continental Europe.
V2 – A larger batch was made and these had the addition of larger 0 AWG power terminals. These had text printed on the top and yellow PCB. 16v operational voltage introduced. Not compatible with V1 for strapping.
V3 – Slight design tweaks to the board layout to improve reliability under low impedances. Blue PCB board and some other aesthetic tweaks. Improved packaging. Not backwards compatible with V2 for strapping.
V4 – Further reliability tweaks and doubling (!) of power supply capacitor bank. Also a controlled line level output for reliably “daisy chaining” for larger multi amp systems, enabling accurate gain control of all amps from 1 remote. New remote control with clip light. Visually this model has the new logo panel to distinguish it from the earlier models. Not compatible with V3 or V2 for strapping.
V4.1 – The V4 is an absolute triumph - probably our favourite product in the whole range. There is literally nothing we feel that we could do to improve it at this point except to remove the "DB1.3" printing from the front panel so it can be installed any way up. The model designation printing on this will be on the end of the amp instead. We expect deliveries of the V4.1 unit to begin Q4 2017 - stock arrived into our warehouse June 2017 but we had some V4 units left to ship. Note that these are IDENTICAL apart from the printing on the body and the all new colour printed outer carton. Compatible with V4 for strapping.
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