Logitech Z680 5.1 Computer Speakers (5-Speaker, Silver) Review

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(More customer reviews)I have wanted to go digital for long time. My Logitech Z-5300 was an amazing set of speakers, however its lack of digital inputs/outputs isolated its potential to the home PC. Finally, the price of the Logitech Z-680 dropped to an affordable price.
I sold my Z-5300s to another student in my dorm, and purchased the Z-680 from Amazon.com. Amazingly, I received the set within 2 business days via UPS Ground. Needless to say, I am immensely satisfied with Amazon.com.
Thankfully, I had recently purchased a Philips DVP642 player as well, and after reading that the video coaxial RCA cable was the same as the digital audio coaxial, I was all set and ready to go.
So far, I have tested the DVDs Matrix: Revolutions and Lord of the Rings, The Return of the King. I was amazed by the quality of the sound. However, I agreed with the other reviewers that the bass was a bit boomy, especially in Matrix Revolutions. This can be easily remedied by lowering the level of the subwoofer.
When playing my DivX encoded AC3 movies, I saw that changing to Dolby Movie Mode 2 was almost the same as having true Dolby Digital 5.1 surround sound. It did an excellent job of separating the audio tracks among the voice, music, and sound effects.
Edit 9/25/04: Please read my latest update which explains the difference between Dolby Prologic Decoding and Dolby Digital 5.1. Knowledge is Power!
I have yet to hook my Z-680s to my home PC, but there was very little hiss while my set was hooked up to my DVD player. The hiss was certainly not loud enough to warrant annoyance or disturbance.
Update 9/06/04:
I hooked the system up to my PC via coaxial s/pdif. There is no hiss at all. However, when using the analog connections, there was a very noticeable hiss. I could even hear it 3-4 feet away, which became very irritating.
Trust me, if you buy the Z-680s, do yourself a favor and use the coaxial connection. You won't regret it. I have decided to leave the Z-680s as my personal home theatre system as opposed to hooking them up to my PC.
Last note: the Philips DVP642 is the perfect complement to the Logitech Z-680s. You cannot go wrong with them. Having the two items has been a blast.
Update 9/16/04:
Still loving the Z-680s. I have it hooked up to my suitemate's Xbox, TV, and the Philips DVP 642. Since the Xbox and TV both use analog inputs, I used the handy RCA to 1/8 converter included with the Z-680s. I also purchased a 1/8 splitter. I am considering purchasing the Xbox Advanced AV Pack to utilize the optical connection on the Z-680.
Warning: the subwoofer has become ridiculous...after breaking in the speakers for two weeks, normal levels of bass not only shake my whole 5th floor, but the 3rd, 4th, 6th, and 7th floors-no kidding! Surprisingly, the 4th and 6th floors received the most impact--those vibrations go a loooong way! Remember, if you buy this unit, keep the bass at 20%, unless you are watching Star Wars...then pump it up!
Update 9/25/04:
There have been claims that Logitech has been falsely advertising their product as having true Dolby Digital 5.1 when allegedly, they only had Dolby Prologic II decoding.
Now, there is a big difference between the two. The Dolby Prologic decoding technology has been around for a looooong time; I can remember it since 1991 when my family purchased our first home audio set. Dolby Prologic takes stereo channels and converts them into a surround sound environment--to good effect, but nonetheless hardly comparable to true Dolby Digital 5.1, a more recent technology which directs its sound with far greater accuracy to all six channels, frequency, clear separation of effects and dialog, and clarity than Dolby Prologic.
I too, became a concerned consumer after hearing these rumors on forums and consumer reviews on Newegg and here on Amazon. My product box did not dictate clearly whether it had one decoder or the other or both, so I decided to call a Logitech technician. Thankfully, the the Z-680s came equipped with the ability to decode both Dolby Digital 5.1 and Dolby Prologic II.
So when you are playing a DVD you should see "Dolby Digital" appear on the LCD screen of the Digital SoundTouch Control Center. The Dolby Music/Movie Mode that you see when you are playing mp3s or watching a DivX movie is the Dolby Prologic II decoder at work and works very well to its credit.
In a side note, screw Dolby Digital and stick to DTS, the other digital surround sound option the Logitech Z-680 offers, when playing DVDs if the option is available. I have had a greater experience with DTS 5.1 decoding with the Z-680s in the 10 movies I have watched in comparison to Dolby Digital 5.1. DTS makes great use of the surround sound even in movies such as Zoolander [which otherwise makes very little directional use of the rear speakers]. Even my five suitemates agree that DTS has a richer, fuller sound and because of the variety of DVDs we watch during the weekends, it is difficult to say that we are influenced by placebo. There IS a difference :-).
New Setup:
Analog Input - from T.V. & Playstation 2 with stereo splitter
Optical Digital Input - from Xbox
Coaxial Digital Input- from Philips DVP642 DVD Player
Update 10/05/04:
Here is a brief comparison between Dolby Pro-Logic II and Dolby Digital 5.1 using two selected movies:
Dolby Movie Mode with DivX encoded movie Man on Fire:
Voice/Dialogue - mostly center channel with slight residual sound from front left/right speakers.
Music/Score - Evenly divided among front and rear left/right speakers
Sound Effects - Non-directional, evenly distributed. During the gun fight scene when the girl is kidnapped, Pro-Logic II simulates a surround sound effect of gun-fire, making it multi-directional.
Dolby Digital 5.1 for Man on Fire DVD collector's edition:
Voice/Dialogue - Isolated to center channel
Music/Score - Directional music: fades from front to rear speakers or vice versa, varying from scene to scene.
Sound Effects - Directional. Isolated use of rear speakers from rear left to rear right when cars drive by. During the gun scene mentioned above, distinct sounds of bullets "whizzed by" from front right to rear left speakers.
Dolby Movie Mode with DivX encoded movie Star Wars Phantom Menace:
Voice/Dialogue - mostly center channel with slight residual sound from front left/right speakers.
Music/Score - Evenly divided among front and rear left/right speakers
Sound Effects - Non-directional, evenly distributed. Surround sound lightsaber effects can be overpowering as a "large hum" especially with the Z-680's powerful subwoofer.
Dolby Digital 5.1 for Star Wars Phantom Menace DVD:
Voice/Dialogue - Isolated to center channel except in large rooms, echoes can be heard in surround speakers.
Music/Score - Directional music: fades from front to rear speakers and vice versa varying in scenes.
Sound Effects - Directional. Spaceship travel from rear left to front right. Close-up light saber swings begin from rear left and travel to front left, front right, and ends with the rear right speaker.
Update 10-24-05:
OMG! I finally got AC3 to work-but I don't know how! Well, I was playing the Casshern DVD back-up encoded with XVID and AC3. I didn't expect the AC3 to work, so I set the audio effect to Movie Mode. However, I suddenly was hearing discrete audio from my surround sound channels. Bewildered, I went up and listened closely to the center channel, and then the front left channel. Hmmm, either I was having a really good Prologic decode or this was playing in Dolby Digital! I glanced at my control pod and I couldn't believe my eyes--it stated it was decoding in Dolby Digital! Wow! Now I am going to check on all of my AC3 encodes...this is too cool.

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The Logitech Z-680 gives you THX-certified theater-quality digital sound. Both optical and coaxial inputs provide for simple connection to nearly any audio appliance, and with the digital SoundTouch control center and the wireless remote, you can sit back, stretch out, and let loose.
The bass pumps through the Z-680’s 188-watt subwoofer. Four 62-watt satellites and a 69-watt center channel provide crystal-clear midrange and highs.
The Z-680 includes built-in Dolby Digital and DTS hardware decoding. Connect the Z-680 directly to a PC sound card, Xbox, PlayStation2, DVD player, satellite receiver, or other Dolby-ready source and get true surround sound. You can also get 5.1 surround sound from a stereo input through the advanced Dolby Pro Logic II system. You can also connect up to four audio sources simultaneously, while accessing each one at the touch of a button.

Click here for more information about Logitech Z680 5.1 Computer Speakers (5-Speaker, Silver)