http://www.adorama.com/RCFMR55W.html
The specifications are great and unlike most consumer grade products are
actually published :) $212 each speaker is a bit rich however. Rolex vs Seiko?
On Apr 23, 2013, at 12:46 PM, Jim Brown wrote:
> On 4/23/2013 8:44 AM, Ramon Tristani wrote:
>> And last but not least, what is the science of designing a transceiver with
>> so many advanced features if the output product, the sound coming out of the
>> speaker, is mediocre at best?
>
> As a retired audio professional (Fellow of the Audio Engineering Society),
> ham for 55 years, and contester since 1957, I have several thoughts on this
> question.
>
> 1) The science of loudspeaker design, while well understood, is so far
> removed from the science of building high quality radio transceivers that it
> makes no sense for a small company like Elecraft to devote their limited
> engineering resources to designing and building one.
>
> 2) For any serious operating, I've always used headphones. I use a
> loudspeaker only for casual operation, and for monitoring while I'm in the
> shack doing somethings else.
>
> 3) The "ideal" loudspeaker for ham radio is nothing more or less than one
> that has very smooth, uniform ("flat) frequency response in the range of 200
> - 4,000 Hz, maintains that uniformity over a wide range of angles where the
> listener is likely to have his/her ears. It should either be sufficiently
> efficient that it can be made loud enough by the relatively small speaker
> amplifiers in the K3, or it should have its own internal power amplifier.
>
> The problem with loudspeakers having internal power amplifiers is that nearly
> all I have seen, including some rather expensive pro models, have serious RFI
> problems.
>
> Loudspeakers that are relatively small tend to have smooth response over
> wider angles, but they also tend to be less efficient (that is, they take a
> bit more power to drive).
>
> Bottom line -- Elecraft made exactly the right decision to stay out of the
> loudspeaker business. If you want an outboard loudspeaker for ANY ham rig,
> simply look in the pro audio world for one that has flat response,
> sensitivity of at least 80 dBSPL for 1 watt at 1 meter, and fits on your
> operating desk. Look for audio products, not radio products. The best I know
> of is the RCF MR55, which is made in Italy and distributed worldwide. I've
> used them in some very high quality professional installations.
>
> http://www.rcf.it/products/installed-sound-systems/monitor-series/mr-55
>
> Exception -- for many years, Motorola has marketed some small loudspeakers
> designed for use with their commercial VHF/UHF transceivers that works well
> for ham radio.
>
> 73, Jim k9YC
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