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Marantz 170DC - best coupling?

Yggdrasill

Yggdrasill

AK Subscriber
Subscriber
Finally I got both my Marantz 170DC and Accuphase C-200 recapped and working as (better than?) new. I rotated them into my system, replacing a Sansui AU-919. Man, do they sound great.

However, I am curious about the AC/DC coupling switch on the back. What are the relative sonic dis/advantages of running the Marantz the AC or DC modes? The speakers are ADS L1590IIs.
 
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When set to AC the switch prevents any DC or extremely low frequency signals from passing into the amp.
From the owner's manual:
170DC acdc.jpg

Try it both ways.
Tom
 
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