Logitech Z623 2.1 THX Speakers
200W Power Subwoofer
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The Logitech Z623 2.1-channel speaker set offers powerful stereo sound at an affordable price. Here's our review.

It has been a while since we've seen THX-certified speakers in the market made especially for PCs. Therefore it feels good to see Logitech's latest offering, the Logitech Z623 with its THX-certified tag. With its powerful sound and massive subwoofer, the Z623 is here to bring mainstream speakers down a notch.

The Logitech Z623 has a total power output of 200W RMS, which is powerful in terms of PC speakers, and its THX label ensures that it is not just a mainstream 2.1-channel speaker but a system that promises powerful deep bass and clear audio surround for your movies.


The Logitech Z623 system comes with two magnetically shielded satellites, each of which is rated at 35W RMS power output. The satellites have fixed cables at their bases and the single mid-bass 3in driver on each satellite is protected with a non-removable speaker grille while the tweeter is hidden behind the THX logo. The right satellite sports the power switch, volume control knob and bass level controller. The right satellite sports 3.5mm stereo jacks for aux-in and headphones out on its left side.


The subwoofer is powered by an 8in front-facing driver with a side bass port. The sub-driver, like the satellite mid-bass drivers is protected by a metal mesh grille which makes it less vulnerable to damage. The wooden enclosure has a dimension of 302x282x264mm, which isn't compact compact by anyone's standards. In fact, it's enormous for a PC sat-sub system. Pair this with the front-facing 8in driver and you got a hefty sub-sat system that shakes the ground.

The back of the Logitech Z623's subwoofer has one 3.5mm stereo input and RCA inputs for connecting two audio sources, while the left and right satellites are connected to a single RCA port and a D-sub port respectively.

The Z623's satellites, despite being enclosed in molded plastic, don't feel cheap, and they offer good build with adequate weight. Unfortunately, they are not wall-mountable. The cables attached to them are of good quality, but I wish they were a bit longer. Also, the cable attached to the right channel is way too thick at around 5mm diameter which makes it less flexible and makes it more obtrusive on the desk. The wooden sub weighs eight kilograms which adds stability, especially while playing heavy bass sound.

The system does not offer remote control, and the package includes one RCA cable and one 3.5mm stereo cable with three terminals for connecting it to multiple audio sources.

Setting up the system is as easy as any other 2.1 speaker system, and you can plug in three audio sources at the same time. As mentioned before, one thing we disliked about the speaker system is the thick cable connecting the right satellite to the subwoofer. And the fixed design means it won't be easily replaceable, in case they are damaged.

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