Logitech Z623 THX 2.1 Speaker System with Subwoofer (400W Peak) – PC, PS4, Xbox, TV & mobile connectivity

If you want a proper step up from basic TV or laptop audio, the Logitech Z623 THX 2.1 Speaker System with subwoofer is built around one clear idea: deeper bass and a more “proper” sound stage for everyday entertainment. It’s a wired 2.1 set (two speakers plus a sub) aimed at desktops, gaming consoles and screens where you’d rather not rely on the speakers that come built into the device.

On paper, the Z623 leans on THX-certified audio tuning, plus a peak power figure of 400 Watts and 200 Watts RMS (as stated in the product information). It also keeps life simple with both 3.5mm and RCA inputs, so you can switch between sources without constant unplugging.

Key takeaways

The Z623 is a THX-certified 2.1 speaker system designed to give you amplified audio with deep bass, using a subwoofer rather than pretending smaller speakers can do the heavy lifting. It’s particularly useful if you’re setting up a home desk for a PC, or a multi-device corner where a TV, games console and a media player all need to feed into the same speakers.

That convenience matters because this system supports multiple inputs: the right satellite speaker includes controls you’ll actually reach for (power, volume, bass, a headphone socket and an auxiliary connection). In practical terms, it’s meant to be the kind of setup you use daily, not a “special occasion” audio rig.

Worth noting, though: 2.1 systems are always a compromise compared to higher-end multi-speaker home cinema setups. You get punchier low end and a more immersive feel than typical built-in audio, but you’re not matching the imaging you’d expect from a more complex surround arrangement.

What you’ll notice day to day

The most noticeable change is the bass. The subwoofer is the point here, and the system is specifically described as delivering deep bass with THX-certified audio tuning. If you watch films, play games or listen to music that benefits from low frequencies, it’s the kind of upgrade you tend to feel straight away—especially at moderate to higher volumes.

Controls are also a genuine convenience feature. With the right satellite speaker offering power, volume, bass adjustment, a headphone connection and an auxiliary input, you’re not forced to hop over to your PC/TV every time you want to change the sound level or tweak the low end.

A micro-example of how it can play out: you could run your PC through the 3.5mm input for gaming, then switch to a TV-connected source using the RCA connection when you settle in for an evening. When you want quiet, you can use the headphone socket on the speaker instead of turning the whole system off.

The essentials

This is an amplified 2.1 speaker system with a subwoofer. The key connectivity options listed are: - 3.5mm input - RCA inputs

The product information also states it’s designed to connect multiple devices (up to three sources) and mentions examples like PC, PS4, Xbox, DVD player, TV, smartphone and tablet.

Power figures are provided as well: 400 Watts peak power and 200 Watts RMS. Those numbers are there to set expectations, but the bigger takeaway is that this is intended to drive fuller sound than typical small desktop speakers.

What stands out (and where it can fall short)

Where it shines: - THX-certified audio tuning, aimed at producing an optimised listening experience “from the start”. - Deep bass via subwoofer, not just extra “boom” from the satellites. - Easy day-to-day control access, including headphone and auxiliary options. - Multi-device approach thanks to 3.5mm and RCA inputs.

Limitations to keep in mind: - It’s a 2.1 setup, so if you’re chasing immersive surround sound effects, this system is unlikely to feel like a full home cinema alternative. - If your priority is ultra-precise detail at low volumes, you may find it doesn’t fully replace a more refined high-end audio chain. It’s built for fun, punch and convenience more than audiophile neutrality.

Who it’s for

This is a solid fit if you want amplified desk or living-room sound that’s ready for common sources: a PC, a games console, and your TV. It suits people who prefer a single speaker system to handle multiple devices using the available 3.5mm and RCA connections.

It also makes sense if you value physical controls on the speaker. The right satellite’s headphone socket and bass control are exactly the sort of practical details that reduce friction.

Compatibility & requirements

The stated connectivity points are 3.5mm and RCA inputs, and the product information notes a wide range of potential sources such as PC/PS4/Xbox/DV D player/TV/smartphone/tablet. The set uses a UK plug.

You’ll want to double-check that your specific devices have the output types you plan to use (3.5mm or RCA). If your source only offers other output types, you may need an adapter or an alternative connection method before it becomes “plug and play”.

Should you buy it?

Buy it if you’re looking for a THX-certified 2.1 speaker system with a subwoofer for deeper bass, and you want the practicality of 3.5mm and RCA inputs to manage up to three device sources. It’s especially worth considering for a gaming/PC desk setup, or a living space where the TV and console share the same audio.

Skip it if you need true multi-channel surround, or if your priority is more specialised audio accuracy rather than an amplified, bass-focused everyday upgrade. It may not be a great match if you’re working with sources that don’t output via 3.5mm or RCA without extra conversion.

If you’re trying to decide between sticking with built-in speakers versus adding a dedicated subwoofer-based system, the Z623 is clearly positioned as the “upgrade path” option—just don’t expect it to behave like a full surround cinema system.

Mini FAQ

Does it support both 3.5mm and RCA connections?

Yes. The product information specifically mentions 3.5mm and RCA inputs.

Is it designed for multiple devices at once?

The information states it can connect up to three devices, using the available inputs.

Can you use headphones with it?

Yes. There’s a headphone connection on the right satellite speaker.

What does THX certification mean here?

The listing says the speakers are THX certified and optimised to offer maximum realism “from the start”. It’s best seen as an audio-tuning claim rather than a guarantee of identical performance with every source.

What power figures are given?

The listing provides 400 Watts peak power and 200 Watts RMS.