Amplification - The unit used in the Z-5450's is of solid state non-BASH specification. BASH is a 'hybrid' design which is meant to provide the fidelity of a class a/b amp with the efficiency of a class d amp and is utilized by Klipsch and Creative whom possess that greatest competition to Logitech at the moment. Although Logitech have decided against using this technology, we have found the amplifier circuitry to be more than adequate and to provide plenty of good clean power to the system, never giving that strained feeling at anything up to the highest volume level - this is also referred to as the amount of "headroom" an amp has. We would say that Logitech have matched amplifier and speaker components well and it shows when the heat is turned up.
THX? Many people out there have no idea what this means and those who do realize it's just another selling point for the big manufactures like Creative, Klipsch and Altec Lansing... but who can blame Logitech for wanting to match the PR hype and get this certification as well. Originally developed by George Lucus for ensuring the premium representation of his feature films at movie complexes around the world, it like many other things, has morphed into a standard for 'ease of operation and setup' and basically ensuring that the company delivers what it says on the box. So yes, it is quite different from the THX certification used originally and also now on high-end home theatre receivers. Not necessarily a bad thing in its own right, just unfortunately doesn't mean as much these days for the well informed consumer.
Multi-room audio, now we are impressed! The Logitech wireless technology means you can have the system set up in one room with your computer and then place the wireless satellites in a different room providing multi-room listening, which means you can walk from room to room without having to miss out on what you are listening to. We cannot stress how refreshing this flexibility is and it is definitely a sign of things to come in the future where we might even see surround speakers that "dock" and recharge like an iPod for use outdoors. The really good thing here is that Logitech are experimenting with new uses for existing technology. Though it must be stated that Logitech does not officially advertise this as a feature they probably could in the future if they expanded on the concept with the possibly of a system similar to that implemented by Klipsch where secondary subwoofers can be "daisy chained" for multiroom wireless playback - the possibilities really are only limited by budget constraints and competitive prices, which are the main selling points.
From an overall perspective, the performance of the Z-5450 satellites when listening to music is well above average especially considering they are a tweeter-less design, which we think was a gamble, that paid off well in this instance. We found off-axis performance to be acceptable if only the slightest margin behind the very impressive and smooth Megaworks. Midbass was clear and well defined for a 2.5" driver, which again goes to show the quality components used in the construction of these speakers. We found the crossover between the sub sats to be quite good resulting in a rich laid back sound that is very impressive considering the modest dimensions of the drivers in use.
Our only concern when recommending the Z-5450's solely as a music system would be the subwoofer, which we feel is somewhat of a compromise in comparison to the z2300 sub (not to mention the other hefty models on offer from Logitech). It's not that it cannot produce bass when required, it's just not up to the quality of the rest of the system which is something easily rectified in future models. We would absolutely love to see what Logitech's 10" sub could do paired with this system.