Matter of taste.
Some basses compress the highs because of the woods used e.g. Warwick Thumb. Others don't.
If you decide that you need compression then you can attempt to add a valve somewhere along the signal chain for the lightest of touches e.g. Avalon U5 DI.
[size=4]Or use a compressor. Then there's the decision about how much compression and which band - e.g. Trace Elliot Dual Comp or EBS Hexacomp. And then, if you decide to go full comp of all bandwidth, some do it more attractively than others...[/size]
[size=4]Get out there and see what works for you. Sometimes a multi effects unit like the Zoom B3 can give a flavour of what to expect. [/size]