I felt like a king when I got a pair of these in 1978. I also had my Mom buy a pair. I still have them in storage. The best mid/high price speaker ever made in my opinion.
Notes: 1) I've put them toe to toe with B&W n805 diamonds ($5000/pr) and they gave up nothing. 2) Internally, the mid and tweet are in a separate chamber from the woofers. 3) The main caps are all 5% Metallized polyester. Most speakers of that era used 10% electrolytic (like polk, klipsch, JBL) which are mediocre at best. 4) I just refurbished mine with dark oil and re-built the crossovers with new 5% metallized polypropelene. They eat the B&W for lunch now. 5) I use a 12" sub with them and a Mullard tube preamp.
If I may help you out. The mids & tweeters are domed and don't 'need' to be in separate chambers since they're both sealed drivers. Better than 5% is to actually match the pair. You can have 10% that are a matched pair & they'll perform better than 5% NOT matched. The key here is quality of cap & matching over their tolerance. I've built a few DIY speakers & have upgraded more. When you design crossovers you do want the parts as close to the designed values and matched. Just adding to what you said.
I used to work for an audio dealer that sold ads speakers, I believe those are a 7" driver.. where the 810 has two 8" drivers , the 910 had two 10 inch drivers.. they kick butt.
These are great speakers and were among the best available in the 1970's. The only minor quibble is that I find the highs on ADS speakers to be a bit "sizzly" and fatiguing. This may be exaggerated by the RU-vid audio quality.
Worth noting: The L710 are actually BETTER sounding than the L-810, which is surprising since the L-810 were intended as a step up, with bigger woofers, more power handling, etc. It's simply a matter where ADS got the recipe right the first time, with the L-710, and then tried to make "improvements" that did not pan out on the L-810. Also worth noting, a few years later ADS did indeed manage to make REAL improvements in their lineup with the introduction of the L-1290. If you find a pair of the L-1290 today, all original, where the cabinets have not been breached, original drivers and guts, then you will have reached audio nirvana.
Nice video! I started a vintage speaker collection a year ago. I just received a nice pair of A/D/S L10's. The mids and high along with the sound stage is amazing for such a small speaker. I just bought a pair of L700's. I cannot wait to get them
