[Elecraft] K3 excessive bass
Jay Bromley
jayw5jay at gmail.com
Tue Apr 7 15:24:51 EDT 2009
Thanks Paul,
That makes a lot of sense and like I said I am not complaining one bit on
the K3 audio. I main point I was trying to make was the K3 doesn't have
excessive bass in stock form or from what I have seen in any form.
I will send you my plots later, I have a QRP meeting tonight to get ready
for.
However I still don't see much difference on bands 2 on any output, but I
will experiment more tonight. To be honest I don't use the EQ at all, my K3
stays on digital most of the time!
The problem is one guy will add a comment to this thread, then a guy like me
will comment on that and now it is getting away from the original subject
line. So I am changing this now and will be my last post on this subject
unless someone would like me to run a test, etc.
Just commenting on what I see, hear, and can measure.
73 de jay/w5jay..
>> 1 and 2. On the line output I see a little less bass than the other
>> outputs
>> and I would expect this since it has a transformer in line that the
>> speaker
>> and phone output doesn't. In fact I don't see a change if I go crazy
>> boosting RX RQ bands 1 and 2.
>
> Jay,
>
> Here are my SpectraPlus FFT plots for the IC-7800 (Magenta), IC-7700
> (Blue), Ten Tec Omni VII (Red), and Elecraft K3 (Yellow). Each plot was
> taken from the respective headphone output and the volume level adjusted
> in order to show an uncluttered overlay.
>
> http://216.229.20.37/images/ResponsePlots.JPG
>
> To achieve a reasonably flat low-end response on the K3 requires an FC
> shift to about 1.25 from 1.50. But in doing so, note how the high end
> response is now limited to about 3.2 kHz (See yellow trace).
>
> Not surprising, the IC-7700 and IC-7800 traces can be laid on top of each
> with a nearly identical response. Both produce a response bump between
> 100 Hz - 300 Hz. The Ten Tec Omni VII produces the best overall Rx
> response of the four rigs tested. I wish I still had the TS-870 for these
> tests as it measured ruler-flat out of the box from 30 Hz to 6 kHz.
>
> Regarding the K3's Rx EQ, I see substantial Rx EQ changes on bands 2-8
> when adjustments are made, but no change on band 1 when adjusted from one
> extreme to the other. It simply has no effect. I've tried various
> alternate settings to see if I could engage band 1 to move, but so far, no
> luck. It doesn't bother me as I leave the EQ flat.
>
> Paul, W9AC
>
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