The SBS Designs SP-1PRO is a Vacuum 2UBE Processor with 7 front panel useable controls designed to let the end user Sweeten up and improve the dynamic range of any full range source. A carefully designed expansion process will bring out exciting detail that is so often masked by recordings that are compressed and engineered to be mono compatible. The SP-1PRO will also bring back amazing detail to digitally stored / processed recordings which where subject to data reduction processing.