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... that an RMI sounded best with a Hi-Scream Cone? Source: "While the Electra-piano would work with any guitar amplifier, RMI brochures suggested using it with a 100-watt RMI 140-series amp .... RMI also sold an accessory .... that could be placed on top of the amp to blast out high frequencies. RMI nicknamed the device the "Hi-Scream Cone". (Lenhoff, Alan; Robertson, David (2019). Classic Keys: Keyboard sounds that launched rock music. University of North Texas Press. ISBN 978-1-57441-776-0 p. 298)