TEst ACC here is the schematic for the Audio board. [document|27323]. If that is not working for you, use the speaker cable connector pinout on page 7 as a guide to wire the speakers to a pre-amp. We would need to see the driver board that you are using, so we could determine how to connect a pre-amp to it. "read on here that its meant for cheaper speakers and is insufficient to drive the IMacs" not quite the way it works. Those boards do not have an audio amp and are usually just enough to add some headphones. Anyhow, use that audio output to connect to an inexpensive amp (5W will be sufficient) and run the iMac speakers on that. Not to complicated really. Wiring the pieces together will depend on what that all looks like. To post some pictures of it all with your Question,use this guide [guide|21499]
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Test ACC here is the schematic for the Audio board. [document|27323]. If that is not working for you, use the speaker cable connector pinout on page 7 as a guide to wire the speakers to a pre-amp. We would need to see the driver board that you are using, so we could determine how to connect a pre-amp to it. "read on here that its meant for cheaper speakers and is insufficient to drive the IMacs" not quite the way it works. Those boards do not have an audio amp and are usually just enough to add some headphones. Anyhow, use that audio output to connect to an inexpensive amp (5W will be sufficient) and run the iMac speakers on that. Not to complicated really. Wiring the pieces together will depend on what that all looks like. To post some pictures of it all with your Question,use this guide [guide|21499]
TEst ACC here is the schematic for the Audio board. [document|27323]. If that is not working for you, use the speaker cable connector pinout on page 7 as a guide to wire the speakers to a pre-amp. We would need to see the driver board that you are using, so we could determine how to connect a pre-amp to it. "read on here that its meant for cheaper speakers and is insufficient to drive the IMacs" not quite the way it works. Those boards do not have an audio amp and are usually just enough to add some headphones. Anyhow, use that audio output to connect to an inexpensive amp (5W will be sufficient) and run the iMac speakers on that. Not to complicated really. Wiring the pieces together will depend on what that all looks like. To post some pictures of it all with your Question,use this guide [guide|21499]