Korpa 
BB1025X incorporates many of the same features found in the BB2000 series such as, spline joint body and 5-piece neck, diagonal body thru stringing, newly developed pickups and bridge. This bass gives strong presence in sound with defined low end.
Spline Joint
BB1025X has employed a 3-piece body structure with which its bridge is placed on the center piece in order to translate the maximum amount of string vibration to the body. Instead of simply gluing wood pieces, we insert a Maple plate, called "Spline", into a slot on its joint sections. By doing that, Yamaha has succeeded in obtaining as much body vibration as 1-piece body with this 3-piece body structure.
Diagonal Body Thru Stringing
In Diagonal Body Thru Stringing, strings are angled 45 degree at the saddle to reduce the stress and secure their tension. Moreover, because the attachment area of strings to saddles is larger than conventional vertical stringing, much better transmission of vibration is obtained.
Pickups
Both front and rear pickups are specially invented for this particular series. Pursuing ultimate passive sound, "Open Face Pickups" are used to cope with even aggressive picking of rock players.
5-Piece Neck
These necks consist of Maple and Nato. It provides durability and prevents necks from warping and curling.
Nickel Silver Nut
Nickel Silver is selected for nut. It is the same material with fret wires. Unlike conventional bone or artificial ivory nut, it gives the same sound quality and feeling even when open notes are played. For any bass players it is a crucial part of well-defined low end.
