Yes, I have a DN-19 in the queue. Currently working on the I 3-CS, though.
The SP51 remains one of the more 'tunable' ones I've heard. Generally the differences with tuning ports are pretty mild. With the DN-19, based on the very limited listening I've done so far, the tuning seems to only affect the bass. I prefer it with the 'flatter' tuning. Not quite sure where it ranks overall at this point but its review shouldn't be far off.
Thanks man appreciate the quick response. And looking forward to you review
Great saying and I agree what you said.
However, I think following the manufacture's tuning should be more nature (uncertain about this).
I don't like the player's EQ that make me feel that I will get not really nature sound by digital tuning.
There should be some degree that sound have been altered by digital tuning except simply the frequency boost or reduction.