12-21-2010 10:10 PM
One think i have to confess to you zcinema123, of all the members of Logitech Forum I have talked to, you are the one I enjoyed talking & sharing my views the most. You posses the same analytical & technical skill & viewpoint of the subject under discussion that I have. Also you provide very short & precise answers that are to the point. I just love that.
Your post "Z Cinema possible fix - Windows Vista & 7" is very informative & the most important thread related to Z-Cinema speaker system in this forum. Cheers bro!!!!!
12-21-2010 10:29 PM
thanks for the feedback. it's been a pleasure with you too.
the reason i signed up in this forum is possibly to help some people who have difficulty with Z Cinema speakers, considering they're seldom talked-about. The major price slash must've been attractive so I thought couple of people would bought it. Seeing it as an 'unfinished' product actually, the USB processor inside is flawed, but that doesn't stop me from enjoying it.
to my surprise, the forum is more lively after some of your useful posts. too bad this is a support forum so people wouldn't actually visit here if they don't have any problem.
it's been a while since i'm active in testing some PC speakers, that explains the short answer that I have, for I no longer have the experience to share them here. Cheers!
12-24-2010 09:47 AM - edited 12-24-2010 09:53 AM
Look at the Z-Cinema's switching power supply powering the amplifier as below:
Take at even closer look at the main component of the Z-Cinema's switching power supply :
Now look at the labeling of that component:
It is clearly stated, MAX TOTAL OUTPUT POWER 83.3W
The simple rule is, you are always going to get less power (Watts) from the amplifier to what you are able to deliver to the amplifier. Now if you consider that the Z-cinema amplifier is receiving 83.3 W from the switching power supply, I don't know how Logitech claims that Z-Cinema have 200W .
Anybody to help me out? zcinema123 what do you think of this?
12-25-2010 01:10 AM
nice catch. it seems they use the exact power supply for Logitech G51 as well (claimed total 155W RMS). well if it's really 83.3W then it's a shame putting underpowered psu to both speakers eh logitech?
no worries, i am not surprised, this is the reason they limit the volume of the Z Cinema which result in lesser power consumption. lucky thing i am satisfied with the volume they provide. it's pretty good if you didn't install the software.
12-25-2010 01:16 AM - edited 12-25-2010 01:18 AM
About my previous post on Z-2300 regarding the frequency spectrum Z-2300 is able to travel, well it can play anything between 20 Hz to 20,000 Hz.
Previously I downloaded, the video files of different tones from youtube, man youtube contains some crap, the frequencies was all wrong. I downloaded youtube video which can play from 1Hz to 35 Hz and believe me I can even hear 1 Hz when human audible frequency starts from 20Hz !!!!!!!!!!!!
So, then i went to an authentic website http://mdf1.tripod.com/test-tones.html an downloaded tones from 20Hz to 20kHz contained in 780kbps wav audio files.
Man am i was impressed with my Z-2300, playing the 20Hz tone and volume 30%, Bass 100%, my bass driver was moving like hell. It proves that Z-2300 is capable of producing sound even deep down 20Hz. Any way I am still searching for audio files that range between 1 Hz to 20 Hz.
I request you to download the tones from the above website and test you Z-Cinema. Play in foobar to get the best results.
12-25-2010 01:33 AM
12-25-2010 01:53 AM - edited 12-25-2010 07:09 AM
Excellent software --> burninwave
Tested all frequencies decremented by one from 30Hz to 1Hz on my Z-2300.
Volume : 50%, Bass: 100%
From 30 Hz down to 15 Hz : Bass driver moving vigorously like heaven broke loose. As predicted between 20Hz - 30Hz I can hear the sound produced by the bass driver along with the mechanical sound made by the moving paper cone of the driver. From 19 Hz to 15 Hz i can only hear the mechanical sound made by the paper cone of the driver while the sound produced is not perceived by my ear. This software produce accurate frequencies. The driver excursion looked like in between 7mm to 8mm.
From 14 Hz down to 10 Hz : Bass driver moving. I can only hear the mechanical sound made by moving the paper cone of the driver while the sound produced is not perceived by me. The excursion looked like 3 mm.
From 9 Hz down to 5 Hz : Bass driver moving by maybe 1mm. I can only hear the mechanical sound made by moving the paper cone of the driver the sound produced is not perceived by me. The excursion looked like 1 mm.
Below 4 Hz : No movement.