The Sunshine
By Holger Kraft
09 Aug 1997
History
First of all I would like to give you a short overview about the history of the project. The main reason why I began to develop my own speaker is, that I am interested in tube amplifiers, like many DIY-audio enthusiasts. Five years ago I built my first vacuum tube amplifier, an Orthophonic IV (this is a kit from a small German company called Audio Workshop). Since this time I was highly infected by the Vacuum Tube disease. Now you can imagine that this speaker is suitable for nearly all tube amplifiers and all other amplifiers that have a rather small output power.
Introduction and a short personal opinion
Because there are only very few commercial speakers available which are able to cooperate well with low output power around 7 Watts and a low damping factor and that do not look like a lorry after a heavy traffic accident, I decided to try my own way. Of course there are great projects in that field available on the Internet and of course you all know The ARIEL and The ME_2 by Lynn Olson and The Poly Natalia by Dick Olsher. But here in Germany there is no possibility to hear this speakers and I would recommend a speaker with a high impedance that will not drop under, let us be realistic, 7 Ohm, because all tube amplifiers can better deliver Voltage than current. The great designs mentioned above are both 4 Ohm designs, using two 8 Ohm woofers in parallel. For all of you who are puzzled about sensitivity and efficiency and all those stuff I will make the statement that an 8 Ohm speaker with an sensitivity around 90 dB has the same efficiency as a 4 Ohm speaker with an sensitivity around 93 dB.
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