On 1/6/2014 2:02 PM, EricJ wrote:
The K2 speaker has been better for CW than anything else I have tried.
Elecraft found a VERY good speaker for the K2. Don's advice about looking for a 4 ohm speaker is also good -- virtually all loudspeaker amplifiers have a VERY low output Z, typically 0.1 Ohm or less, making them a constant voltage source. By simple Ohm's law, they will provide maximum power to the lowest impedance which they are designed. Power is E squared divided by R, so you can use them with higher Z speakers, but you will lose 3 dB of level for 8 ohms, another 3dB for 16 ohms.
The second part of the equation is loudspeaker efficiency. In general, the smaller the loudspeaker, the less efficient it is. In other words, louder = bigger. The best 4 ohm loudspeaker I know of is the MR55, made by RCF, and Italian company. I've used them in some high profile projects. They're not cheap. Smaller speakers in their line are not nearly as nice.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
