(Later addition: The linoleum triagle pyramid speaker may have a less flat frequency response than the linoleum cube Auratone 5C type speaker. More experiments needed.)
A good speaker should sound great when then sound wave coming out of it is picked up by a microphone.
Signal path:
Smooth FM 99.8MHz radio station - JVC 9425W radio power amp (headphones) out - linoleum tetrahedron speaker with Tesla 5in drive unit standing on linoleum carpet - Vivenco DM200 unidirectional moving coil mic at 2 meters - Sony TC-D5 Pro - Sennheiser HD580
Amazing sound. Very clear. No mid or whatever prominence. Intelligibility.
No Pleiades filter needed between mic and Sony preamp. (The Pleiades (130Ω,40mH) filter is needed when signing at normal voice and normal distance from mic for avoiding bass heaviness to listener's brain).
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