I just bought a 250w parts express plate amp (300-793) and plan to match it with a adire shiva driver. The driver hasn't come in yet, so I hooked it up to my friends pioneer diamondplated car sub (200w Max 4ohm). It didn't go very loud at all. My receiver was at +6db for subout It was 3/4 cranked and it wasn't even that loud. Would it be any louder with a shiva hooked up? I hooked it back up to my friends 180w car amp and it was so much louder. Does anyone have good experiences with this amp?