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This is the one I used: https://www.amazon.de/-/en/dp/B07MPMM97V?psc=1&ref=ppx_yo2ov_dt_b_product_details Sorry for the late reply.

I, too, have powered my PB 540c with USB-C for some time. I used a Surface Pro USB cable from Amazon, one that has a built-in trigger for 15v. I cut off the surface connector and wired in the PB power cable with connector to it. It works wonderfully.

Yes, I managed to solve the snapping and popping issue. It wasn't the wire but something funky going on with the plastic housing (where and logic and analog board reside) and where it mounts to the front of the CC. It has some play in it and moving it while turned on resulted in the weird...

Hi, Very sorry to hear about the family medical emergency. I really wish the best outcome for it. I've tried Wish I were, clean installs of various Mac OS versions, no extensions, and pretty much everything that I can think of. Nothing has an impact.

Ok, just an update. The snapping and popping sound apparently is from a bad speaker wire (I assume) and I had a play session with Heroes of Might & Magic II and I could hear the glorious stereo sound coming and going with the pops. So stereo sound is definitively there. I just need to get...

Ok thanks, it's the same guide as I followed. I did post my findings about the components a few posts back: CS1 is obviously a bypass cap, given its location. I still measured it to check my meter's accuracy; bang on 100nF CS3 is an electrolytic 1µF 50v CS5 is 3.2-3.3nF, not 3.3µF as has been...

@Fizzbinn @YMK - I used the Welcome to the Going Stereo page of the Colour Classic Compendium guide and http://colourclassicfaq.com/general/stereo.html, which has some issues in it. @JDW I certainly am aware that the process is more complex than slapping on another speaker. I will ask Kay Koba...

Hmm... Not sure what's going on... Sounds Control Panel indicates Stereo But Monitors & Sound doesn't look like it is... AppleCD Audio Player plays through all speakers even when selecting left or right. Am I missing something? Anyway, as for the components, here are my findings: CS1 is...

@JDW I just did the stereo mod but I’m a little confused. While the new speaker is working, there is no stereo separation whatsoever and new speaker is more quiet as others have reported. Speaker is from a CC donor. Control panel shows no difference than what it was. Still mono. I’m sure I...

This is all correct. Neither method seemed to have any impact so I would hold off on doing it unless there is perceivable clipping or distortion which is what @YMK was saying all along. I think I'll do the stereo mod this weekend and see if I get the extra options in the sound control panel...

@YMK I did the resistor mod again but this time across the signals to ground. I did not notice any change or improvement in terms of volume. I think it is fine without the resistors from my brief testing so far as I didn't hear clipping or distortion. It must be a sound mixing issue but I can...

Ok, here is the pinout diagram to start with. Still testing resistors.

Yes, that's the plan. Once I've verified everything. I'm actually already trying to think of how fancy do I want to get with the sketch. :)

Doh! I have them in series. I'll try fix this but it might take a couple of days. There shouldn't be any harm having them in series?

Thank you! Yes, I suspect that I may indeed be the first to do this. Funny how we still come up with new stuff for 30-year old machines. As I replied to @JDW, I applied the resistors just in case. I did not experience clipping or distortion but the output seemed really high at low volumes. I'm...

Nice. I have spare Color Classics for parts so I will get a speaker from one of them. Having a solid state CD-ROM as @YMK stated is the whole beauty of the MacSD (amongst other things) and will allow all audio to be outputted to the CC speaker/s. I did go ahead and put the 10K resistors in...

@YMK - Glad to report that I was able to get the CD-audio to work. I took the board out and looked at the connections. I was not able to tone them out to any chip as much as I tried, but when I looked at it logically, I was 100% confident that I had the right signals. So far I've verified...

Hi @JDW It just so happens that I am running a Keystron 128MB in my Mystic CC (and Atari TT030). Works brilliantly for years now. Do note that boot-up on the CC takes a long time. The CC is doing a memory check while the screen is blank so one would mistakenly assume that the RAM does not...

Yes, this is a Mystic CC. Ah, good to know about the output, cheers.

This sent me down a rabbit hole. There is no information on the web that I can find with any pinouts for the wiring harness on the LC 575. Not having an actual LC 575 chassis, I have still managed to narrow the CD-audio signals down to a section on the LC 575 logic board edge connector based on...