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depends how you were lissening to it, as volume is measured as preasure level then if you played an 18" sub into a small enough area then it could be possible to hit 180db from 1 sub but you'd need to play it into an area almost as small as the enclosure it's self. Ever lightly tapped the end o...

It sound from what you said that your subs are both single voice coil 4 ohm drivers , if this is the case then you should either run them in series 8 ohm bridged or 4 ohm stereo ( like a pair of full range speakers ) I don't think the kenwood amp is rated at 2 ohm bridged (that doesn't mean it won't...