I have been spending the last several days working on my 70-vintage Pioneer and Sansui speakers. Spurred on by another thread on audio equipment, I have been working on checking out these speakers, and to bring them back to life.
I hauled the Pioneer speakers from the living room they have been sitting for the last 20 years, and were last used as subwoofers because the high was lacking. Found out that the tweeters had been blown. Finding a replacement is not easy, considering that it has to be mounted in the same place, and has electrical characteristics to match.
Then, I found out that one of the monster Sansui pair (weighting 60 lbs each) had both of its tweeters blown. Again, finding replacement is tough, but I have located some old tweeters on eBay that people were parting out from old speakers.
Anyway, I have now a nice set up to sweep the speakers to check their response and distortion using a microphone and a PC. I had to do it outside, with the speakers on stand to check their free-air response. There's still ground reflection. This stuff can get complicated if you get picky. In the end, it may not matter much as all bets are off when the speakers get placed indoors, and then the human ear is really not that discerning to a few dBs.
When I receive the replacement drivers, will have to spend a day or two to tweak them after installation. It's a nice leisure activity that does not cost all that much.
My lower back has been seizing up for the past few days. Even walking to the grocery store is a challenge. Darn!
Hope you will feel better soon. I have not had back pain, but know that it can be debilitating.