The best reverb I used in recording was the one my dad build for me in 1983.
In those days digital reverbs were extremely expensive, analog reverb sounded terrible (to my ears at least) and spring reverbs had a quite distinct sound but they weren’t useable for everything.
The so called plate-reverb was still very popular (and seems to be still)
The thing my dad build used an iron plate 0,5 mm thick. Size about 1 by 1,5 meters. The plate was suspended in springs attached to a wooden frame.
The sound was put on it by a loudspeaker’s magnet/voicecoil system directly glued to the plate (which gives a much better high frequency response compared to just letting a speaker “shout” at it like most DIY plates use.) and driven by a small amplifier. The sound was picked up by an old piezo-electric record player element/arm(stereo, mind you !). Needle removed and put on the edge of the plate.
It was hanging on the wall of my home studio with no acoustic isolation. During mix-down everybody in the room had to be quiet particularly at the end of a track because the plate picked up the voices and so they were recorded as well :?
I used the plate during the recordings of Ensemble Pittoresque’s Frequenz album but only for all “effect” tracks. Best example being the backing noises on the track Frequenz.
Also on the Wassenaarse Slag compilation on Clogsontronics. To hear it at its best is probably the Marge and the Marvelous track A Distant Dance.
For those interested google around on “plate reverb”.
Just found this one although I think this design needs some improvements.
Youtube has some vids on DIY plates too.
Ton