Hello,
I am the owner of Hyak guitar.
I bought it Dec. 2005 at Tokyo, the price was $1600 without power supply and hard case.
But it was included NEW DS-5R and 5pin Cable.
Because the guitar price was around $1000 at the time.
Last year I took the picture of Hyak's power supply.
The shop had Hyak bass with P.S. and Case.
But the first price was $6000 !
Then they offered $3000 because circuit trouble.
Here is the pict. of P.S.
It has male 5 pin connector that pointed out by Michael.
Eiji