In my view, tonearms such as the Schroder Reference ($7,500 & up) need to be re-tuned in response to weather changes. I am a fan of Frank's work & consider his tonearms works of Art. With a Schroder , weather changes scream-out to you. After you understand that one can use that as a reference point for many other Tonearms. In my view, the reason so many perfectly splended Tonearms appear on AG has to do with adjustment issues , mal-adjustments with phono cartridges having nothing to do with performace.For instance, Maplenoll Tonearms are air bearing as is the platter. Barometric changes change the alignment of the cartridge & height of the platter. Slight alignment problems "blurr" the delicate sound of a performace. Ms. Lumley was way ahead of her time, (see TAS 1983 & up). The information I outline is far-less available in a hard-rock LP but quite discernable in classical performaces. Z: If you want,God, find religion not 2 channel stereo . Set-up is everything. As for bats they use sonic vibes , our hearing is different. I do enjoy watching them against a Maryland Sky near dusk. I reside next to a Wildlife Sanctuary. Thank you for Honoring Bats.