Higher resolution Jazz

Sometimes I think older may be better because they didn't have enough technology to mess things up. CD is a good example. Its 16/44 uncompressed. If we had lossy digital compression at the time when CD was developed, Redbook CD would have probably never happened. We would have went directly to MP-3's.

"Older Jazz recordings are of poor quality"

Let me offer a different point of view that older recordings (not only jazz) could be, and are, superior in many cases:
First, all the musicians were in the studio or on stage playing together as a group--there's something organic about that vs. the synthetic of overdubs, track bouncing, mix down, etc. The event was recorded in real time so it starts with a sonic purity of performance.
Second, the recording equipment chains were relatively short and pure. Mic to mic pre-amp, to mix console to master tape. Very little signal processing compared to later years.
Third, because that chain was all analog, there was no decimation processing. Once mastered the next phase is reproduction.
Pressing to vinyl, done well, is also a pretty short "chain" from lacquer to master to mother to stamper. There is some signal processing when creating the lacquer master--RIAA and some frequency extreme limiting but that's to ensure the vinyl is practically playable.

At its essence, with fewer "moving parts" in the recording and reproduction process, there were fewer places to go wrong. Try to listen to the Rudy Van Gelder recordings--they are a great starting point for "older" jazz well recorded.

Look for the Concord recordings made at Penny Lane studios in NYC with Ed Trabanco as engineer.There was a run of a few years that Concord did most of their NYC based recordings with this studio and this engineer. Sensational,organic,living,breathing recordings that capture the music in all it's acoustic splendor.A good one to start with is the Gerry Mulligan/Scott Hamilton-"soft lights and sweet music",great music and a recording that captures it perfectly.
Stepping back into the time machine...Most of the Japanese produced albums,notably Eastwind and Atlas from the 70's and 80's were carefully miked in the studio and the musicians played what they wanted to and it was a notable combination.
How will the ECM recordings stand up to time? They are like sonic icebergs to me and steer my boat clear of them,and I do own some but the music sounds frozen,they had a good long run,now those lp's seem to find their way into the bargain bins.Time has a way of sorting things out.

I've grown keen on 50s mono releases, esp the Miles Davis mono box set. Sounds fantastic, check that out. Working through Coltrane mono box now called Side Steps. I agree with the above that simple = better.

I'm listening to more and more mono, although that's perhaps worthy of a separate thread.

Miles Davis milestones recording from mid late 50s comes to mind as a really good older monophonic jazz recording.