Head-to-head · Best Desktop Computer Speakers

Logitech Z623 vs Logitech Z906

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Logitech Z906 comes out ahead by a narrow margin (4.0 vs 4.1). The gap is mostly about Home-theater and gaming buyers who want true THX 5.1 surround sound and the power to fill a large room. — read the strengths below before deciding.

Ranked #5 in Best Desktop Computer Speakers

Logitech Z623

4.0

3 sources1 derived$184.99as of Aug 1

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.

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

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

$184.99 · Check Price on Amazon Full review →

Higher ratedRanked #4 in Best Desktop Computer Speakers

Logitech Z906

4.1

3 sources1 derived$410.99as of Aug 1

The Logitech Z906 is a THX-certified 5.1 surround system with five satellites and a powered subwoofer, putting out 500W RMS. It decodes Dolby Digital and DTS for genuine cinematic surround and fills large rooms with deep bass. Reviewers praise its power and immersion for games and movies, while noting weaker music playback and the lack of HDMI.

Strengths

— True 5.1 surround with five satellites and a powered subwoofer
— THX certified plus Dolby Digital and DTS decoding for cinematic immersion
— 500W RMS (1000W peak) fills large rooms with powerful, room-shaking bass

Watch-outs

— No HDMI inputs, awkward with modern 4K TVs
— No HD-audio (Dolby TrueHD / DTS-HD MA) decoding
— Musical performance is weaker than its cinematic strength

$410.99 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

Logitech Z623

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.

Logitech Z906

The Z906 is the only true surround system here, adding 5.1 channels the stereo Klipsch ProMedia 2.1 THX, Logitech Z623, Logitech Z407 and Creative Pebble Plus cannot match, with far more power, though it is overkill for a simple desktop setup and lacks the Z407's Bluetooth.

Specs side-by-side

Spec	Logitech Z623	Logitech Z906
Configuration	2.1 stereo	5.1 surround
Power	400W peak / 200W RMS	1000W peak / 500W RMS
Subwoofer	7-inch side-ported, 130W	165W powered
Satellites	35W each	Five, 67W each
Inputs	Two 3.5mm, RCA, headphone jack	Optical, coaxial, RCA, 6-channel direct, 3.5mm
Certification	THX	THX
Cabinet	Plastic	—
Connectivity	3.5mm input, RCA input	3.5mm, RCA, six-channel direct, digital coaxial, optical
Control	Dedicated console	Dedicated console
Decoding	—	Dolby Digital, DTS

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