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. 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 the rolled-off treble, though it found the immensely powerful subwoofer managed not to overshadow the main speakers. 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.
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 $180, 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
Price history
5 daily reads from amazon.com since Oct 29, 2026. Lowest $181.99 (Nov 1), highest $181.99 (Nov 1), latest $181.99 (Nov 8). We call whether it's a good price once there are 7 days of reads at one store.
Rating sources
Counts as 4.92/5 in our score — this publisher's 195 scores on the site average 4.25, so its scores are adjusted down to compare fairly with other publishers.
Counts as 2.91/5 in our score — this publisher's 14 scores on the site average 4.29, so its scores are adjusted down to compare fairly with other publishers.
“The immensely powerful subwoofer managed not to overshadow the main speakers.”
Counts as 4.03/5 in our score — this publisher's 1 scores on the site average 4.00, so its scores are adjusted up to compare fairly with other publishers.
“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, each adjusted for how strictly its publisher scores. More about methodology.
