Not necessarily.  I have a “C” board in my K3, but I also have the LPF 
installed.  If you are the original owner of the radio, then I suppose you’d 
know if you installed the LPF board or not.  If you bought the radio 2nd hand, 
then you’ll need to see if the LPF board was or was not installed by the 
previous owner.

Grant NQ5T


> On Sep 8, 2015, at 12:33 PM, Rich <rwnewbo...@comcast.net> wrote:
> 
> Would I be correct that the difference between DSP C and D is that C is 
> lacking the LPF rolloff at 4 Khz?
> 
> Assuming I am correct should I expect better rx audio quality with D?
> 
> Rich
> K3RWN
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