"Users of wide-range playback equipment should compensate for the RIAA curve"

jond

I get to think of my uncle whenever I reference his system, and of course each time I listen to my speakers which are new enclosures with the ElectroVoice Drivers from 1958. The woofer is 15W weighs 37 lbs, the big corner Klipschorn used the 15B version. They face forward now, they faced down when in the President, it was on 8" high bronze legs.

I’ve re-coned the woofers a few times and have a full set of replacement drivers and crossover, new 16 ohm L-Pads. The horns drivers are impregnated linen and the crossover components are buried in tar in the grey metal can, seemingly indestructible.

The tweeters are T350’s, originals were the smaller T35’s, I burnt a T35 coil blasting Iron Maiden’s "In-A-Gadda-Da-Vida". On my Reel to Reel version, you can hear him drunkenly say "In the Garden of Eden". 

When competing solutions exist, prior to 'standardization', i.e. RIAA was the as yet undetermined but eventual standard, the specifics of which solution was used, they are telling you it was recorded using the RIAA eq, and you should therefore use RIAA Playback curve.

LP means Long Play. Bass had to be cut during recording to minimize the width needed for bass notes, to get more grooves closer together, to get more music on each side, i.e. Long Play. 

My Uncle Johnny’s Fisher ’President II’ console (which I inherited), made in 1958 while standards were being resolved, had a few options. Live Binaural Radio existed for a very brief period. You tuned CBS FM, then tuned CBS AM, then snapped to ’Stereo Radio’

https://www.audiogon.com/systems/11420