Sounds right, but the lower the impedence, the less control the amp has over the speaker. This leads to bass that can be a lot boomier and looser than it should sound.
What brand of speaker is it? Just curious...
Also, if bridge a two channel amp to each sub you can divide the numbers you came up with by two. (.5ohm bridged=.25ohm, 2ohm bridged=1ohm)

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98.5 Contour
Zetec w/ auto (doh!!)
modified stock airbox
res and muffler removed
glasspack added
Knauberized
Pioneer CD
Alpine speakers in all doors
2 pioneer 10" subs


-Ken V.
psycho_bass@hotmail.com
My Car