I feared the worst When I saw the box that arrived from Amazon; struggling to imagine 5.1 kit could possibly fit in such a small space. Then I saw the subwoofer; smaller than my old T6100 subwoofer. The satellites didn't look particularly impressive either.

After turning the system on I was a little less worried; oddly the down-firing subwoofer manages to pump out much better bass than the subwoofer it's replacing (or at least as far as I can tell, it's 'fluffing point' seems fairly high) and I can't hear any difference when running the same satellites from the T6100 alongside the Z506's. All is good.

It is worth noting however that this is supposedly an 'upgrade' to the Logitech X540 - a system which has two drivers per satellite - and by the looks of things these drivers are identical. You're getting one instead of two on four of the speakers. Also, the black glossy thing that looks like a tweeter on each Z506 satellites; it's just plastic I'm afraid.

Furthermore, the Z506s have shoddy fabric grills as opposed to X540's metal meshes, no separate wired remote control and no way of wall-mounting. I would definitely not say this is an upgrade from Logitech's previous model; rather a bit of corner-cutting. Bad Logitech!

The Z506s do sound good however. This at least with the subwoofer on. The reality behind the Z506s and pretty much any other 5.1 kit is, that whilst the kit seems like a steal, turn off the bass and you can hear just how cheap the satellites are: tinny with no 'body'.

At £60, these aren't bad, but I'd be hard-pushed to say they're amazing when I got my acoustically-similar T6100s for £40 about 5 years ago.