To be honest, I cant recall, do a search here as I know the question has been asked and answered before.
www.omegaowners.com
As a bit of a tip, the door speakers in the Cat/Omega are actualy pretty dam good, its the amps in the source that let it down.
The recommended way of upgrading that we follow is to fit an external 4 channel amp of about 30W RMS per channel to drive the door speakers, we then filter the sub130Hz out and use a seperate sub to fill in the bass....
This gives a much bigger improvement for a similar cost when compared to swapping the existing speakers.....its also a lot less hassle to do!
