hate to imply financial restrictions when talking about my s2000 MY2002. but I would like to improve the anemic sound system and it appears that an amp is the best choice. I can't put mount it into the trunk or spare tire (spaces already taken). I would prefer to mount under driver's side but would do passenger's side if necessary. thanks in advance.

 

Are you looking for a 2 or 4 channel amp? In either case, the Blaupunkt Class T amps are an excellent choice:

The PA2150 is 150W x 2 and $240:
http://www.ikesound.com/Prod_Details.asp?Prod_Id=196

The PA4100 is 100W x 4 (mine tested at 115W x 4) and $312:
http://www.ikesound.com/Prod_Details.asp?Prod_Id=216

Either will fit under both seats if the plastic case is removed.

 

thanks, probably a 2 channel amp, If I add rear speakers, the original HU should have enough power.