The Logitech Z623 is a THX-certified 2.1 system delivering 200W RMS with an immensely powerful side-ported subwoofer. Reviewers praise its deep, rich bass and value for games and movies, while noting the satellites lack high-end detail. With two 3.5mm inputs plus RCA, it connects three devices at once, making it a flexible, bass-forward desktop choice.
Full review
Tremendous bass, but treble that rolls off
The Logitech Z623 makes its name on raw power and bass. TechRadar described the sound as deep and rich, with the most three-dimensional quality they had heard from a 2.1 system, and concluded the speakers come highly recommended. With 200W RMS (400W peak) driven by a side-ported subwoofer, the Z623 fills a room easily and is a favorite for gaming and movies where impact matters more than nuance.
Critical reception is more mixed on detail. Tech Digest praised the superb bass response and excellent stab at immersive THX audio, calling them easy to recommend, but noted the satellites lack a little in detail. Expert Reviews was the most reserved, scoring it 3 out of 5 and noting that while the immensely powerful subwoofer managed not to overshadow the main speakers, the treble could feel rolled off. The consensus: tremendous low-end, good mids, but a top end that trails the Klipsch ProMedia.
Three wired inputs and a dedicated bass knob
The Z623 uses all-plastic enclosures for both the satellites and the subwoofer. This keeps the system lighter and easier to position than the MDF-cabineted Klipsch ProMedia, but reviewers note plastic is more prone to vibration and lacks the acoustic damping of denser materials. The build is sturdy enough, just not premium.
Connectivity is a genuine strength. The Z623 offers two 3.5mm inputs plus RCA and a headphone jack, allowing up to three devices to be connected simultaneously, a flexibility the single-input ProMedia cannot match. A dedicated bass knob on the right satellite lets you dial the subwoofer level up or down on the fly, which is useful given how much low-end the system can produce.
Room-shaking lows, but hi-hats lack sparkle
Sonically the Z623 is bass-forward and loud. The side-ported subwoofer delivers deep, room-shaking lows that anchor explosions and music alike, and reviewers across TechRadar, Tech Digest and Expert Reviews agree the bass is the system's standout trait. The mids are solid, handling vocals and dialogue well at moderate volumes.
The weakness is the treble. Several reviews note that hi-hats and other top-end frequencies lack the sparkle and detail of horn-tweeter systems, and that at higher volumes the powerful bass can begin to overwhelm the mids and highs. For listeners who want a balanced, detailed presentation, this is a real consideration; for those who want sheer impact, it is rarely a dealbreaker.
No Bluetooth and a bass-heavy balance
The Z623's main shortcomings are detail and balance. The plastic satellites cannot resolve high-frequency detail the way the Klipsch ProMedia's horn tweeters do, and Expert Reviews' 3-out-of-5 score reflects that the overall balance is bass-heavy at the expense of refinement. The all-plastic construction also lets cabinet resonance creep in during intense passages.
There is no Bluetooth, so wireless streaming from a phone is off the table, a gap the Logitech Z407 fills. And while the system is loud, pushing it hard tips the balance further toward the subwoofer, so listeners who value clarity should be mindful of volume.
More power than the ProMedia, less treble detail
Against the Klipsch ProMedia 2.1 THX, the Z623 offers more RMS power and more inputs but trails on treble detail and cabinet quality. Against the Logitech Z407, the Z623 is louder and more bass-capable but lacks Bluetooth and the Z407's mid-focused balance and control puck. The Logitech Z906 steps up to true 5.1 surround, while the Creative Pebble Plus is a far smaller, quieter budget option.
The Z623 is the pick for buyers who prioritize loudness, bass and wired flexibility over outright fidelity. It is a proven, THX-certified workhorse that has stayed popular precisely because it delivers cinematic impact at a low price.
One of few THX-certified sets at $120
At around $120-150, the Z623 is strong value for buyers who want a loud, bass-heavy THX system. The combination of 200W RMS, a capable subwoofer and three-device connectivity is hard to match at the price, and it remains one of the few PC-oriented 2.1 sets to carry THX certification.
The value softens if treble detail or wireless matters to you, since the Klipsch ProMedia sounds cleaner and the Z407 adds Bluetooth. But for the specific buyer who wants maximum volume and bass per dollar with flexible wired inputs, the Z623 delivers a lot of system for the money.
For gamers who want volume over polish
The Z623 suits gamers and movie watchers who want a loud, impactful 2.1 system with deep bass and the flexibility to connect multiple wired sources at once. If you care more about cinematic low-end and volume than about pristine treble, it is an easy recommendation.
Skip it if you want the cleanest possible highs (the Klipsch ProMedia), Bluetooth streaming (the Z407), surround sound (the Z906), or a compact desk-friendly footprint (the Pebble Plus). For its bass-forward, wired-flexible niche, though, the Z623 has remained a value staple for years.
Strengths
- +THX-certified 2.1 system with 200W RMS, one of few PC sets to earn THX
- +Powerful side-ported subwoofer delivers deep, rich bass and real low-end rumble
- +Multiple inputs (two 3.5mm plus RCA) connect three devices at once
- +Dedicated bass control knob for on-the-fly low-end adjustment
- +Strong value as a loud, bass-heavy system for games and movies
Watch-outs
- −Satellites lack high-end detail; treble can sound rolled off
- −All-plastic construction is more resonance-prone than MDF rivals
- −No Bluetooth connectivity
- −Bass can overwhelm the mids and highs at higher volumes
How it compares
The Z623 puts out more raw RMS power (200W) than the Klipsch ProMedia 2.1 THX and has more inputs, but its plastic satellites lack the detail of the Klipsch horn tweeters, and it has no Bluetooth like the Logitech Z407 or surround channels like the Logitech Z906.
Rating sources
“The sound is deep and rich, with the most three-dimensional quality we've heard from a 2.1 system. These come highly recommended.”
“The immensely powerful subwoofer managed not to overshadow the main speakers.”
“Superb bass response and an excellent stab at immersive THX audio make them easy to recommend, even if the satellites lack a little in detail.”
Our 4.0 score is the average of these published ratings. Ratings marked * were derived from the reviewer’s written analysis or video transcript — the publisher didn’t print an explicit numeric score, so we inferred one from their own words. Click through to verify. More about methodology.
