I'm interested to know whether connecting speakers to a stereo via a terminal block would cause any problems - in particular, degradation of sound quality.

The stereo in question is a 12V marine stereo being installed in my boat.

The sort of terminal block I'm referring to can be seen here

http://www.marinco.com/en/tb-118-10p

The blocks have very high conductivity and each pair of screw terminals is electrically and physically isolated.

This is a common approach in boat wiring.  Due to the amount of vibration, you need to mechanically support connections.  It allows connection of devices to supply circuits via secured ring terminals.

It also keeps wiring tidy, and makes replacing components easier.  This approach is use for powering devices and for communication bus systems like NMEA-0183.

But ... I don't know what it will do to speaker signals.  I'd appreciate any insight from people familiar with car audio systems.