new sub, old amp

[flawless]

hey there i got a new sub from strathfield details as follows:

Peak Power: 1300W
Rated Power: 380W
Frequency Response: 18Hz - 2kHz
Impedence: 4 ohm
Sensitivity: 89dB/W/m

http://www.strathfield.com.au/ViewProduct.asp?ProdID=1778

i have a old 2chanel 120W amp hooked up to it (bridged) but it sounds like s*** just woundering wot would be the best amp suited for this sub, and if any1 else has the same.

 

[StoneX]

An amp that makes 380Wrms at 4 ohm. Easiest way to get that power would be a 2 channel rated at 100-150Wrms per channel at 4 ohm. If you want a cheap amp that'll "do the job" the Jaycar 2 x 150W would be great for it.

So what's the problem? It sounds like a normal Sony sub?