Crescendo BC2000 (2250rms @1ohm) only used for a total of maybe 2 months play time and never ran below 1 ohm. Mechanical 10/10 Physical 9/10 Amp was bought new and used for 1 month in my 79 dually and used for only a week in my new truck, 375 shipped and insured any where in US. DSS Ethos 15 D2 Sub has only 4 days of play time as of now and getting louder every day. This sub is a monster and is extremely impressive. I would put these up against almost any sub on the market right now. 275 + shipping