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Mystery switch

I have an old Audio Reflex receiver (Model AR-800) which has a 'DE. EMP' switch on the back: 75uS to the left and 25 uS to the right.  The 'u' actually has a preceding tail on it, so its probably a symbol. 
What does this do?
Also, it says on the back 'Do not use speakers less than 8 ohms'.  Is this as imperative as it sounds?

Thanks, 
128x128sound22card
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nonoise's avatar
nonoise
10,825 posts
 
I thought it'd be like the wall switch that Steven Wright mentioned in one of his skits. He'd flip it on and off and nothing would happen. It did for over a week until someone called from out of state and asked him to stop it.
g_nakamoto's avatar
g_nakamoto
348 posts
 
my marantz 4 chanell reciever from the 70's had dolby built in. never used it because i don't remember any fm stations transmitting in dolby. 
zavato's avatar
zavato
1,397 posts
 
My mid 70’s Pioneer receiver also had switchable Dolby demphasis but that was a dead end 

sound22card's avatar
sound22card OP
26 posts
 
I guess I shouldn't mention my DAT player then.
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