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Chip Amps Amplifiers based on integrated circuits

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Old 24th January 2004, 02:26 AM   #1
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Default Logitech Z-680

Hi,

I just got the best computer speaker system ever designed, the Logitech Z-680.

The sound is amazing, and I don't think I have ever heard as much bass from any 8-inch sub before.

I was wondering, has anybody opened up one of these and looked at what chips it uses?

I am sure it would use chip amps, but which ones?

Thanks, Mike
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Old 24th January 2004, 12:41 PM   #2
matjans is offline matjans  Netherlands
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well then,

open it up and shoot some pics!
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Old 24th January 2004, 12:46 PM   #3
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who here says TDA>?????...LOL
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Old 24th January 2004, 07:11 PM   #4
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Well, I don't want to risk opening up a $400 speaker that I just got a month ago

I almost think it could be 5x 3875 to get 50W/ch and a lm4651/52 combo for the 200W sub?

-Mike
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Old 24th January 2004, 07:51 PM   #5
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There are 7 tda7293 in there, 2 are bridged for the sub.

How I know ? Well, my friend owns a computershop, and I owned a screwdriver
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Old 24th January 2004, 08:50 PM   #6
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OK, thanks!

But one thing, if thats true, how come the center channel is 59W, and the other channels are only 53W?

-Mike
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Old 24th January 2004, 09:47 PM   #7
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Yeah, I tore one of the z-560 subs apart this summer after a friend of mine had to return his system (logitech just makes you cut off the control box and send that to them). This one had 6 TDA7293 chips in it, I'm assuming from the one of the previous posts that 2 are bridged for the sub again. Oh, all the electrolytic caps on the board are "chang" brand, anyone know if these are any good?
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Old 24th January 2004, 09:49 PM   #8
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I thought those figures where the powerhandling of the satellites.

Take a look at this:
http://www.dansdata.com/speakersets.htm
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Old 25th January 2004, 02:02 AM   #9
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Actually, my system is defective, and has to be sent back to them. The problem is that when the left heatsink (i assume the sub amp, since it gets hotter than the other heatsink) gets warm, it starts rattling loudly. The rattle is very annoying. Plus, it only takes about 15 minutes at less than half volume on the speakers and half volume on the pc to start rattling.

By "Cut off the control box and send it to them", does that mean I am going to have to just remove the amp and send it to them, meaning I save on shipping costs and get to keep a nice sub speaker/box? Or are you talking about something different?

Thanks, Mike
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Old 25th January 2004, 04:45 AM   #10
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for my friend, "cut off the control box and send it to them" meant cutting the cord coming out of the back of the volume/bass/treble/m3d control unit and sending that unit to them. I think the philosophy behind that is so you can't actually use the system any more...you're just left with all the satelites and the sub to gather dust...
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