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Logitech Z-640 6 Speaker Surround Sound System

4.2 out of 5 stars 125 customer reviews
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  • Six-speaker system with patented subwoofer design delivers twice the bass energy of conventional designs
  • Innovative satellite design with rotating pedestals that allow for wall or desk placement
  • Internal power supply eliminates bulky wall adapters
  • Easily hook it up to your video game console with our included adapter cable
  • Total output power: 71.2 Watts RMS

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Technical Details

  • Model Number: 970073-0403
  • Connectivity Technology: wired
  • Item Package Quantity: 1
  • Manufacturer Warranty Description: Two-year warranty

Product Description

Product Description

LOGITECH Z-640 -- Experience exciting Dolby Digital home theater sound on your PC with this 5.1 Channel Multimedia Speaker System. Its extraordinary subwoofer delivers twice the bass of similar systems, and five elegant satellites provide silky smooth mids and highs. Immerse yourself in an ocean of sound with PCs, video game consoles, and more. Warranty - 1 year Finish - Black

Get the most from your computer games and DVD movies with Logitech's Z-640 surround-sound speaker system. The system's four satellites (left/right, front/surround) and center-channel speaker fill your room with sound, while the 25-watt powered subwoofer rounds out the bottom end to a deep 35 Hz, a good octave below the range of most bookshelf speakers, delivering floor-shaking bass from your music or a DVD's low-frequency-effects channel, the ".1" in a Dolby Digital or DTS 5.1-channel presentation.

Inputs include a stereo analog (left/right) RCA pair and multi-channel analog inputs for decoded surround sound from any four- or six-channel sound card (or audio/video surround receiver).

The satellites are powered by 7.3 watts each, and the center channel, which handles up to 70 percent of most surround mixes, gets 16.3 watts. Logitech's innovative, dual-chamber subwoofer delivers twice the bass energy of similarly sized subwoofers, and the company's use of an internal power supply obviates the bulky wall adapters found on many surround systems.

All speakers are video shielded to allow distortion-free placement on or around your monitor, and the satellite speakers--imbued with easy-position rotating pedastals--may be mounted on stands, your desktop, or the wall. The system is covered by a two-year warranty. A handy supplied adapter ensures instant connectivity with gaming consoles.

What's in the Box
Four satellite speakers, one center-channel speaker, one subwoofer, requisite speaker cabling, one adapter cable for hookup with video-game consoles, and a user's manual.

Product Information

Product Dimensions 16 x 10 x 20 inches
Item Weight 1 pounds
Shipping Weight 17.6 pounds
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Item model number 970073-0403
Customer Reviews
4.2 out of 5 stars 125 customer reviews

4.2 out of 5 stars
Best Sellers Rank #1,404 in Electronics > Accessories & Supplies > Computer Accessories > Audio & Video Accessories > Computer Speakers
Discontinued by manufacturer Yes
Date first available at August 29, 2002

Technical Specification

Warranty & Support

Product Warranty: For warranty information about this product, please click here


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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By M. Saunders on January 26, 2003
After using my previous Logitech 2.1 (satellite + sub) speakers for several years (and loving them!) I decided that for the price, these 640s would be worth the "risk" to gain 5.1 sound.
As usual, Logitech did a first class job on packaging the speakers. Everything arrived in great condition all protected in plastic bags to avoid any cosmetic flaws. Unpacking and set-up of the speakers was very easy -- all of the plug/cables are clearly marked and the cables are of reasonable length (important for the rear channels).
The performance of the speakers is good, especially considering the price range. They are a bit light on the midrange but for most computer applications (ie. games!) this is not an issue. The subwoofer is incredible -- I have to keep the sub set to minimum (there is a knob on the sub itself) since I live in a townhome with shared walls. I just popped a Techmaster P.E.B. audio CD in (a CD that is VERY heavy on the bass - commonly used in car audio competitions) and the sub does a wonderful job of reproducing the extremely low frequencies.
The high-range is good, as one would expect from satellites of this size.
All of the controls are positioned on the center channel speaker and include a Volume, Power, Fader, Center, and Matrix (for if you don't have a 5.1 soundcard) knob/button. The satellites stand on nice matte aluminum stands. The sub is probably around 10 inches cubed, with the speaker exposed on one side (behind a grille) and all of the connections on the opposite side. Cosmetically, these are nice speakers.
So, for the price, I cannot complain. Compared to my previous set of Logitech speakers (Soundman Extreme) and other speakers I have listened to, my only complaint is the midrange reproduction. Other than that, if you are a gamer or a basshead, these speakers will please you.
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Verified Purchase
I just picked these up after seeing a deal at Amazon. I read all the prior reviews on this site and was left with a realistic set of expectations.
Great price
Good build quality
Solid bass
Great high end
Mid range a little weak
Bright blue LED on center is just plain stupid
Bass control on sub - would be better on the center with all the other controls
Note: I have these connected to an Audigy 1 sound card.
Setup:- system was very easy to connect up due to color coding but the packaging and tape over the wires was a pain to try and remove - that took longer than the connections. The build quality of the components seems good and the cable lengths were about right for the way I needed to set it up. However the blindingly bright blue LED on the center is just plain stupid and I had to put electrical tape over that within the first 5 minutes.
Sound quality:- I play games, listen to some music and watch some DVDs. It was clear to me that the default settings on my setup gave a less than stellar sound and required a fair amount of tweaking. Once the settings were correctly configured the sound went from "merely ok" to "very good".
I agree with reviewers that have said the system is a little weak in the mid range but it is not so bad that it detracts greatly from my enjoyment of the system.
Music is good, movies are very good and games are excellent through these. Battlefield 1942 through them is an entirely new experience compared to the (good quality) stereo+subwoofer speakers these replaced.
Bass is sufficient for a small to medium sized room, the highs are clear and the channel separation is good. Mid range is a little weak.
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I wanted a set of speakers that I could eventually use with a 5.1 surround sound system away from my PC. Testing out various speaker systems at a local computer shop, the Logitech Z640s had the best sound for the best price - $... with a $... rebate.
I was already looking at eventually getting a Sound Blaster Extigy to use as my Dolby converter, but with the Logitech Z-640s, it has the "Matrix" surround option which simulates surround sound from 2-channel sources. I was actually impressed with how well it could simulate surround sound. In many areas of movies, it actually worked! However, once I obtained the Extigy, I can attest that nothing can take the place of true Dolby Surround decoding. However, for those on a low budget, the Z-640s with the Matrix surround sound is an excellent buy.
The stands on the two front and two rear satellites allow to you either leave the speakers standing on a table or mount them to the wall. The center speaker's stand only gives you the option of leaving it on top of your monitor or TV set. It allows only two positions: angled up or angled down depending on whether it's placed below or above your listening level. I do wish it allowed mounting to a wall, since that is where I have my front speakers and the center channel should always be inline with or slightly behind the two front channels.
The sub-woofer pounds out the bass so well that my wife is constantly telling me to turn it down! From our rec-room in the basement, she says she can hear it up in our second-floor bedroom. Now, that's some powerful stuff!
Hooking up the speakers is pretty simple. The satellites hook into the subwoofer. From the woofer, another cable comes out with the standard lime-green (front), black (rear) and orange (center/subwoofer) connectors for 5.1 sound cards.
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