inputs.text: awesome - installed 2007 scion tcrunning 1 sub 2 alpine pdx 1600 amps one voice coil 4ohms used amd tool match power crossover two amps exactly alpine 138bt dedicated xs 16 volt battery probably powering right around 1000 true clean watts daily driving built custom box using winisd software free download online allows input specs sub gives exact tune great response box 289 cu ft tuned 32 hz sounds amazingthe reviewers say professionally installed probably not something properly sub caliper needs well built tuned box needs good clean power dvc subs need matched carefully right amplifier wired properlyi hammer sub time long periods never even gets warm touch turned amps several times ran sub full potential even full excursion bass unbelievably clean