I am planning on buying a sub that will run off 300W rms. I only want one
sub and it must have an impedance of 4ohms.

I don't want SPL I need high sound quality. I have now idea which sub to
look at. I am willing to pay about R800 (65 pounds). Here in South Africa
the following brands are available : Pioneer, Kenwood, Calibra
(www.calibra.co.za), Ample Audio ACWD, Infinity (which is too expensive),
Boschmann, Earthquake, Kicker, Starsound (www.starsound.co.za) and Sony.

Any Ideas? Its impossible to listen to the subs as they charge a lot of
labour to set it up.

Any advice appreaciated