Craft speaker"Aoi (Hollyhock)"

Nagaoka matrix SP is examined though it is belated. The Nagaoka matrix system has finally
evolved to such a connection.


    When you consider the ambience speaker to be resistor of 8ohm,
　　


    It becomes like this. Because it is connected with parallel amplifiers of which the output impedance is 8ohm .

It becomes the amplifier of the output impedance 4Ω, and an electromagnetic damping comes to be worried.


    I did it in this way. Vented system seems to work , and the extension of the sound
is satisfactory.

    To see an electromagnetic damping, MFB-20 is put in as a central speaker.
Voice coil verosity is shown as below.



    Q seems to rise certainly. But because of the counter electromotive force of the ambience speaker ,
dip exist .So it might be actually unquestionable of damping as long as the same speaker is used .

　   Though I wrote the extension of the sound was satisfactory , when I test five point location ,
the way to extend is the same as a normal connection.

    Then I compared it with a center shorting , while repeating the second track of "Hikoukigumo".

    In conclusion I felt some habit of 2ch in a normal connection , and the difference became certain.

    "Tropical bird" gives me wonderful sound.

Some plans



    It is reluctant somehow.

    Hollyhock complex

    To tell the truth, the mind has inclined at this. It is put on a black plinth . The sound of　periscope in
center part is preeminently...

  It is favorable to build this from the beginning , but I cannot help hesitating because it becomes
garbage after it was made .

    Ready-made periscope and ready-made closed box with the stand may be enough.

    Only taking a picture?