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only problem with the auro bass shaker is that it isn't a subwoofer, it just emulates the feeling of bass. As for the Focal's, some might sigh from me saying this, but since you are going to have it in a motorcycle environment, you might look into the Coustic 160SE, it is a fairly powerful amp, with a lowpass filter for the subs, and fairly inexpensive. I have just bought 4 of them from an ebay provider and paid just over 120 for all 4.
You get 160w out of it bridged mono to the sub so that should be plenty.
I can get you the ebay seller's name so you can find these for yourself.
--joe

ya i think thats what he was going for was the feel because you would be needing to push over 125dbs to hear the bass on a motorcycle and thats open air.

he's getting distortion audibly at volumes he needs to hear the speakers.
he just needs to amplify a better set of components on the bike. lose the sony stuff and add an amp. that should make it clearly audible, and may circumvent the need for any sub.

OnYrMrk wrote: some might sigh from me saying this, but since you are going to have it in a motorcycle environment, you might look into the Coustic 160SE, it is a fairly powerful amp, with a lowpass filter for the subs, and fairly inexpensive. joe

I'm actually a fan of coustic, mainly for people on a budget. I built a ported box for their lowest end sub (1 12") and it sounded pretty good, with decent output for what it is.

ya know, I had some of their old first gen black amps.. the AMP100a, AMP190, etc.. and they mostly sucked.
When I went to work for Gregs, we picked up their newer silver PowerLogic line, and those amps were terrific.. although we lost a few to heat when people ran them with lamp cord for a 480 watt class AB amp, and mounted them upside down to their package shelf in the trunk.. that tended to cook the amps, but otherwise, great stuff. I ran several for friends with great results.

Just to show you guys the possibilities, my installation shop just finished a Harley install. Check this out: fatboy at Audio Midwest