[Elecraft] K3: honest question re Audio Peak Filter

[Vic K2VCO]

Barry N1EU wrote:
> Okay - hear a simulation of the effect of K3 APF for yourself:
> 
> http://n1eu.com/k3/rz0af_apf.wav
> 
> This is a stereo diversity recording of a fairly weak RZ0AF on a fairly
> quiet topband night.  I switch the APF in and out - it's centered on the
> 400hz sidetone frequency and is 50hz wide and +10dB.  The raw receive
> selectivity is 250-300hz before applying APF.  You'll hear "N1EU" with no
> APF and then with APF.  Then you'll hear "GM UR 579" without and with APF.

But is this any different from reducing the K3 DSP bandwidth to 50Hz and turning up the 
volume?
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco