I was prompted by the site admin to respond here. Weird but, OK.
Initial Cleaning (every LP)
- HumminGuru does 90% of the work for all new vinyl and the cleaner Near Mint secondhand purchases (wash and rinse, two separate cycles)
- I built a motorised vacuum machine for the really dirty...
“Little by little, one travels far.” – J.R.R. Tolkien
TLDR version: JRR is right. The many small things were: loose binding post nuts on the cross-over PCB (Left speaker), Left channel volume of the integrated amp is 5-7% lower across the spectrum, end-to-end speaker cable resistance for Left...
Thank you! Brief responses below
"But the same thing can be done by having measurements of each channel separately and using arithmetic in REW" I did not know that, I will learn how to do this. :T
"The hole at 250-500 hertz disappeared. But the correct polarity is the same as in the first...
Thank you, your advise is greatly appreciated. I did only reverse the the mid/tweeter (the bi-wiring makes that straightforward). The bass was left at normal polarity.
OK. I can try that and post the results here. My original measurements above were done individually, on axis @1M. I configured...
Thank you @sm52
I did take a measurement of the left channel with polarity reversed. My system is bi-wired, so that made the task more straightforward. See below and attached.
Additional Thought / Question: from my original post above, which channel has the expected phase response? I assumed...
- 2 Channel HiFi system, the left channel has a dull high frequency response that is audible
- the SPL response doesn't show the problem (interesting) but the Phase response does
- I physically swapped the speakers (L<>R) and remeasured. The phase response measurements follow the speakers
So I...
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