[Is My Subwoofer Adjusted Correctly?]

I need some advice and I am not that familiar with components.  My REL StormIII bit the dust and cannot be repaired...no parts.  So I bought an SW 12" 400 W sub.  Hooked it up with the single cable.  Can't say I notice any difference in base at all.  I have Klipsch Forte II speakers, center channel and Solid back speakers as well as a year old Onkyo receiver.  What do I do to know if I'm getting the base I want and I want base.  Thanks.....

[12" SW 12 600Watt]

Thanks for the reply.  Comparing UPC numbers etc I find that it's just a R-12SW.  Best Buy has made an error in listing the Watts.  No wonder I couldn't find it anywhere online.  It's 400 Watts not the 600 they show on the receipt.  Either way....it's now on sale for $100 off so I will be going back in for an adjustment.  

[12" SW 12 600Watt]

Best Buy sold me this subwoofer....12" Reference SW12 600 Watt.  Why can't I find this particular subwoofer online?  I find the 300 Wand 400 W but not this.  Is it an old model?

 

Thanks