ivanfraser
Member
Great advice from you guys thanks.The only way to trace down some of these tricky issues is to take your own measurements
Weird interactions can happen, including physical positioning of cables/devices which are classically going to be measurable but not audible, but you may have some perfect storm. If you get different measurements when physically grounding the chassis by touching it, for example, then you would know that the unused earth pin is affecting the playback somehow.
A UMIK-1/UMIK-2 or similarly accurate calibrated microphone can help too. @jhaider has identified issues with a JBL 705p where either the firmware was incorrectly loaded or there was a bum compression driver. If you have a speaker that has always worked and now it sounds distorted a bit, it may be something like the ferrofluid drying out, a crossover capacitor failing, or you have an active speaker where something glitched the firmware you might be able to measure a difference that may not have existed before, etc.
That's the best way to troubleshoot and find the needle-in-the-haystack.
I've been doing a lot of swapping out cables etc. but am fully disassembling tomorrow.
The hum was cured by removing the coax to dac from the Panny, and there was a buzz from the pc solved by changing usb port. (I think the ports might still be an issue but not sure).
I went the expensive route though. Bought new speakers - same issue, then a new dac - same. Now the kit for stereo is all brand new with the 9000A amp/dac. Improved but still a high end prob.
So I have eliminated the hardware - at least the cd to speakers. Now it's seeking out what darned combination of wiring (pc via ethernet - tv - uhd player, and bluray player - and poss the ethernet siwtcher). I really have been doing months of tweeking and am getting somewhere now. But not fully satisfied unless I know the exact cause.
All was perfect prior to the 9000, and thet just replaced the 900. Added a a90D and cdt, and had a moment when removing a trigger cable that I thought had made a temporary pop that may have caused 'damage'.
This is obviously multifactorial, and complex, so I appreciate your considering looking at this. It's not easy picking through so many elements when troubleshooting, I know.
So I'll persevere.
However, still wondering why the Panny sends a 3 pin cable for a 2 pin player. Is that normal. I have never noticed that before.