Doug,

I also have the older DSP board. I elected to add the Low Pass Filter add-on-board because I was not interested in the extended low frequency response. So the proper answer depends on your aspirations - the low pass filter does provide a definite advantage in high frequency 'hiss'.


73,
Don W3FPR

On 9/22/2016 8:20 PM, Doug Millar via Elecraft wrote:
I have an older 2009 K3 without the updated DSP. What is your opinion? Is it 
worth the upgrade to the newer D version? Anyone done a comparison?


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