[Elecraft] [K3] K3 Audio Response - Version 3.33 Firmware

[Brett Howard]

This is true.  I actually messed with my EQ settings using an RTA and a
calibrated microphone measuring the full system including my speakers
and the amplifier.  

~BTH

On Sun, 2009-09-20 at 20:27 -0400, Joe Subich, W4TV wrote:
> 
> > Yes but unless the response remains that way when an 8 ohm 
> > speaker is there its not a very useful measurement.
> 
> Since the speaker coupling capacitors are 470 uF, the roll off 
> at 100 Hz with 8 Ohm speakers is 3 dB.  That's completely 
> acceptable for a communications receiver ... and probably less 
> LF roll off than you will observe due to the speaker enclosure. 
> 
> 73, 
> 
>    ... Joe, W4TV 
>  
> 
> 
> > -----Original Message-----
> > From: elecraft-bounces at mailman.qth.net 
> > [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Brett Howard
> > Sent: Sunday, September 20, 2009 7:42 PM
> > To: Ignacy
> > Cc: elecraft at mailman.qth.net
> > Subject: Re: [Elecraft] [K3] K3 Audio Response - Version 3.33 Firmware
> > 
> > 
> > Yes but unless the response remains that way when an 8 ohm 
> > speaker is there its not a very useful measurement.
> > 
> > ~BTH
> > 
> > On Sun, 2009-09-20 at 07:56 -0700, Ignacy wrote:
> > > Is this measured with high impedance probes? If I remember 
> > correctly, 
> > > small caps limit low-frequency response of K3 especially with low 
> > > impedance phones/speakers. Ignacy
> > > 
> > > 
> > > As a further experiment, I just added 3 dB to Rx bands 1-3 and the 
> > > response is now essentially +/- 0dB between 20Hz and 3.5 kHz in SSB 
> > > through the 6K filter and Fc = 1.35.  You can lay the ruler flat on 
> > > the response.
> > > 
> > > http://216.229.20.37/images/K3-V333-EQ.jpg
> > > 
> > > Paul, W9AC
> > > 
> > > ___
> > 
> > 
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