About a year ago I bought some generic bass shakers (they can be seen here http://www.allelectronics.com/cgi-bi...500&type=store). I'd like to add 2 more shakers (either standard aura bass shakers or pros, I haven't decided which yet...any suggestions would be appreciated). Anyway, the problem is that the current shakers are 13ohms, wired in parallel they put about a 6.5 ohm load on the amp (PartsExpress 120w plate amp). How should I go about incorporating the new shakers into the setup...in other words, how should I wire these little bad boys all together correctly (the auras are 4ohms)? Thanks.