[Elecraft] Re: Perfect K3 Speaker

[Paul Christensen]

My pick is the RadioShack Optimus 8 or 11.  I believe these are long out of 
production but widely available used on the Internet.  I also second N4LQ's 
recommendation on the MFJ ClearTone for CW.

I think the audio "fullness" of the existing K3 speaker could be 
substantially improved with the simple addition of a baffle.  A few weeks 
ago, I looked at this and there appears to be just enough room to form a 
sealed square box around the speaker to form an "infinite baffle."

The problem with 99% of the existing communications speakers is that the 
path from the back-wave of the speaker is far too short and results in 
low-frequency cancellation.  The baffle prevents back-wave and forward-wave 
cancellation.  The result is substantially improved low-end content below 
400 Hz.

Paul, W9AC

----- Original Message ----- 
From: "wayne burdick" <n6kr at elecraft.com>
To: "Bruce Osterberg" <n9bx at mchsi.com>
Cc: "Elecraft Reflector" <elecraft at mailman.qth.net>
Sent: Saturday, May 03, 2008 11:43 PM
Subject: [Elecraft] Re: Perfect K3 Speaker


> Hi Bruce,
>
> For communications bandwidths, a sturdy 4-ohm, 3 or 4" diameter mobile 
> speaker (non-powered) does a great job. For a bit more fidelity and to 
> take advantage of the K3's stereo speaker outputs, I use a pair of good 
> quality bookshelf-style speakers (again, non-powered).
>
> Right now I'm using Best Buy's "Insignia, 4-inch, 3-way surround 
> speakers," which sound quite good, although they're 8 ohms rather than 4 
> so the available per-channel peak power will be lower. They're about 4"W x 
> 8"H.
>
> I had been using just a single speaker, but having two allows me to get 
> L/R separation of the main and subreceivers, as well as take advantage of 
> the K3's "AFX" simulated stereo mode.
>
> 73,
> Wayne
> N6KR
>
> On May 3, 2008, at 7:05 PM, Bruce Osterberg wrote:
>
>> Good Evening:
>>
>> If I was to add an external speaker to the K3 what would it be, looking 
>> for suggestions as Dayton is just around the corner.
>>
>> 73 Bruce N9BX
>>
>> K3 # 775
>>
>
> ---
>
> http://www.elecraft.com
>
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