[Icom] External Audio Filter

[doc]

I have owned both and found the DSP-599zx to be superior in 
every way.

I sold my 599zx and bought a NIR-12 because I was told that 
the NIR-12 was superior in SSB applications, my experience 
did not bear that out and I sold the NIR-12 at a significant loss
and acquired a 599zx once again.

One of the neatest features of the 599zx is the automatic removal
of the bane of HF, lids keying up on top of QSO's.  The NIR-12 
was not only unable to get that done it alos added too much 
distortion to the signal and was hypersensitive to the slighest 
tweak.

Anyone aware of a small and simple dsp audio processor that 
removes heterodynes like the 599zx?

IMHO, YMMV ... 73, doc KD4E 

> > I believe that the most nearly comparable currently available 
> > new unit approaching the NIR-12 is the filter made by Timewave. 
> > I do not recall the exact name but it is something like the 
> > DSP599X. 
> 
> That is an interesting comment.  I had both side by side for a 
> while, and found the DSP-599zx to be the better unit.  Although 
> the NIR-12 is no longer here, I believe the latest DSP-599zx 
> upgrades would make it a far superior choice when coupled to 
> my IC-781.  When correctly adjusted, The DSP-599zx edged 
> out the NIR-12 even back then.
> 
> Mike.  KD9KC