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Old 23rd April 2012, 07:24 AM   #1
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Default Logitech amp upgrades

So, hopefully I'm posting in the right section. I have an old Logitech X-530 system that still works fine BUT I'm just not satisfied with the sound quality.

So, here's a few pics of the amp circuitry. The volume control is on the front left channel and is connected to the port circled in red in the 2nd photo.

Anywho, I'm trying to find a simple and inexpensive way to improve sound quality a bit (upgrade some caps?).

Also, I'm planning on rebuilding the satellites. The sub will remain as is for now (unless you have any suggestions for that as well). The satellites will consist of 4 1/2" 8ohm AKAI drivers and 1" BIC America 1" dome tweets in a custom "mini bookshelf" enclosure.

I know current connected load per sat is 4ohms, and I'm sure I can just wire the new drivers in parallel and get the same load. I was, however, considering bi-amping the drivers (not using the rear channels on this system). Should I just wire in parallel or bi-amp using the rear channels?

Anyway, any help at all would be very very appreciated.

Thanks!

PS: If pics are small, I can email you the full size which are pretty large.

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Old 23rd April 2012, 08:16 AM   #2
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You may realise from your nice Pics, that these are chip-amps. i.e the output power is delivered by the large ICs with around 20 pins and mounted to heatsinks.
'Not a lot of design discussion to apply there, outside the manufacturers applcation notes and alternative PCBs. You need to post in the chip-amp forum, accessible from the home page or the mods may move the post if you report yourself.
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Last edited by Ian Finch; 23rd April 2012 at 08:23 AM.
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Old 23rd April 2012, 08:41 AM   #3
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You wont get much improvement out of one of these.

Better to use PSU and Heatsink for a new design.
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Old 23rd April 2012, 09:25 AM   #4
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I'm sorry to have to provide such a negative post...

Upgrading components won't change much. The fault here is the everything. Bad from the start, and not much can be done about such a thing, other than redoing it from scratch. Modifying the speakers, too, probably won't improve things much.

Su'scon caps... those are considered the worst in the world. Very short life time (and that life is one in agony). That thing is obviously a victim of planned obsolecense. I'm surprised it still works (looks like it was built in 2004).
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Old 23rd April 2012, 10:42 AM   #5
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My apologies for posting in the wrong section.

Well, now that we know it's a **** poor design......any suggestion on extremely low priced 2.1 solutions? Chances are, I'll be using only 2.0 but I'd like to have the sub amp there in case I decide I need the sub. Or would it be easier to just amp a separate sub amp in the future if I find it necessary?
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Old 23rd April 2012, 11:43 AM   #6
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A home hifi amp and real speakers.
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Old 23rd April 2012, 12:45 PM   #7
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Quote:
Originally Posted by Tekko View Post
A home hifi amp and real speakers.
It's a set of pc speakers....you're reply isn't very specific....annnnd there's no fun if there's no DIY.
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Old 23rd April 2012, 02:10 PM   #8
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Powered or unpowered speakers are the priority with 2.1 desktop IMHO.

You can't avoid the cost of quality boxes unless someone gives them away. Trawl Ebay or your favourite used goods website, auctions,
fleamarkets and study what makes good speakers, who fairly evaluates gear to your needs and DIY those things you can't easily reach.
It will will save you money in the long term but buying tools, books and parts to get started is not cheap either.

It is a long learning curve but progress of newbs here is pretty good, when the projects are supported with reading reliable books,
papers and threads supported by the valuable pro. engineers we have cruising this fabulous forum.

Welcome, use it, learn and share - you may love it for reasons you weren't even looking for
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Old 23rd April 2012, 04:33 PM   #9
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I always recommend getting some vintage hifi gear. The 70's gear that remain is almost always cheap, and almost always good. The price/performance ratio there cannot be beaten.
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Old 23rd April 2012, 10:25 PM   #10
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Never thought of using vintage speakers. It a great idea though.

Out of curiousity, how cheap are the eBay t class amps? Will they be at least ok? Or are they complete garbage?
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