[Elecraft] SP-3 frequency range question

[Joe Subich, W4TV]

On 2/5/2018 1:43 PM, James Wilson wrote:
> Great for the K3 on SSB or CW. Not Hi-Fi for music but entirely
> adequate. 

I've been using the Pyle PCB3 series "cube" speakers since well
before the SP3 was introduced.  The Pyle speakers are spec'd at
90 - 20 KHz (about the same as the SP3) and are easy to drive
as well.

I notice no difference in response between the speakers and my
headphones (typically Yamaha CM500 but occasionally smaller,
ear bud or "professional" Sony headphones) *HOWEVER* I have the
K3 RX EQ set to roll off (-16 dB) the 50 and 100 Hz bands with
a -6 dB roll off in the 200 Hz band for SSB/AM and with -16 dB
at 50 Hz and -3 dB at 200 Hz for CW.

There is no issue for me with the roll off if/when I listen to
AM or shortwave broadcast but I can certainly "flatten out" the
response by changing the RX EQ to flat or even add a bit of low
end boost if band conditions are quiet/no QRM.

73,

    ... Joe, W4TV


On 2/5/2018 1:43 PM, James Wilson wrote:
> Bill,
> 
> Personally, I like the SP-3 speaker. I have two of them and,
> compared with my Koss headphones, they both sound like
> the headphones. Great for the K3 on SSB or CW. Not Hi-Fi
> for music but entirely adequate. PLUS, they look good
> in the K-Line.
> 
> Jim - W4RKS
> ----------------------------------------
> 
>> In the real world, does the SP-3 exhibit well rounded frequency
>> response? Or, is the response more directed for "communications use"?
>> How is it for listening to AM broadcast? How does it do with the famous
>> K3 hiss? How does it do with a less capable receiver (one without an EQ)?
> 
>> I am considering some station simplification, hence the SP-3. Currently,
>> I am using the Behringer MS40 pair. Super sound, but quite large and do
>> have an internal amp (I have experienced no RF problems).
> 
>> Bill W2BLC K-Line
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