[Elecraft] SP-3 frequency range question

[Don Wilhelm]

Chuck,

With only 100mW of audio from the KX3 phones jack, I doubt the KX3 will 
drive any speaker directly.  Use amplified speakers.
The SP3 will work fine if you add an amplifier.

I use the West Mountain Radio ComSpeakers with my KX3.  They are not 
only amplified, but are shielded for RF immunity.  No problems here with 
output at 100 watts (I don't run more than that here, never have).

73,
Don W3FPR

On 2/14/2018 9:26 AM, hawley, charles j jr wrote:
> Will the KX3 drive the SP3 adequately?
> 
> Chuck Hawley
>   c-hawley at illinois.edu
> 
>   Amateur Radio, KE9UW
>   aka Jack, BMW Motorcycles
> ________________________________________
> From: elecraft-bounces at mailman.qth.net [elecraft-bounces at mailman.qth.net] on behalf of Walter Underwood [wunder at wunderwood.org]
> Sent: Tuesday, February 13, 2018 10:40 PM
> To: Elecraft Reflector
> Subject: Re: [Elecraft] SP-3 frequency range question
> 
> I use the same Pyle speakers, mostly because they were cheap, but they sound OK. My RX EQ is flat.
> 
> With my KX3, I drive them with a $10 12V audio amp, because the phones output is 100 mW.
> 
> Details here:
> 
> https://observer.wunderwood.org/2017/03/04/speakers-for-my-elecraft-kx3/
> 
> wunder
> Walter Underwood
> wunder at wunderwood.org
> http://observer.wunderwood.org/  (my blog)
> 
>> On Feb 5, 2018, at 12:23 PM, Joe Subich, W4TV <lists at subich.com> wrote:
>>
>> 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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