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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
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.
teo_audio
2,197 posts
 
Your audio reflex was likely made in Korea by Inkel corp.
audioman58's avatar
audioman58
4,130 posts
 
The power supply rails ,transformers are small that is why it cannot handle lower ohm loads .never heard of this receiver. How old is it 
I would not invest in it ,no where to modify it properly ,which you 
would need ample space on any decent aftermarket parts which are all much bigger.
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