Sound on iMac

I'm fairly dissatisfied with the sound level of my iMac. I tried to hook up my Apple Pro Speakers from my G4 iMac and the audio jack in the back is not compatible. I went to the Apple Store and they have a Belkin adapter but it doesn't look like it has the right configuration either. I contacted MacMall and they told me I needed a $125 Griffin amp. Yeah right... that makes a lot of sense. Spend $125 to make a $25 set of speakers work. Does anyone know of an adapter that goes from the G4 mini-jack to the 3.5mm G5 jack?

On further investigation, it appears as though Duane is at least partially correct if not completely correct.
Here's an article on Apple's site that details the speaker configuration of the iMac G4:
http://docs.info.apple.com/article.html?artnum=58764
But, that doesn't mean all hope is lost. The iMac G5 (at least the rev. A and B models) have both analog and digital audio outputs. They share the same jack.
So, provided the connection is compatible, then it just may work.
I've never seen a digital audio connector, so I don't know if it is physically the same as a analog connector or not. If it is the same, then it just may work.
But, it may not. Here is an excerpt from the Apple document about the iMac G5:
This headphone/line output features a D/A converter that supports 24-bit, 32-96 kHz audio for both digital optical audio and analog audio output. For analog headphone / line output a standard audio cable with 3.5mm metal plug should be used. For digital audio, a fiber optic cable with 3.5mm plastic or nylon optical plug should be used.
This comes from the document at:
http://docs.info.apple.com/article.html?artnum=86813
So, you might be best to do some additional research before jumping on the first idea I mentioned last night.
Sorry to have been wrong. It looked quite simple at the beginning.
If you are just wanting a cheap good set of speakers, I have been very pleased with the Altec Lansing speakers from Wal-Mart. They only cost about $10 to $15. I'm using them on my PC at the moment, but I was using them on my Mac Mini until I got the my new iMac G5.
For the iMac, I am just using the built-in speakers. Their adequate for my needs. All my fancy audio / recording studio software is on the PC downstairs.

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Thank you,
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I started having this problem yesterday on my late 2009 iMac 27 inch after I changed my HDD.
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