Yamaha Guitars is now shipping two new electric bass guitars that feature the company's proprietary A.I.R. (Alternative Internal Resonance) technology, which provides the sonic properties of a heavier, traditional-style instrument without the weight.

Previously featured on the RGX A2 electric guitar and RBX4 A2 four-string bass, Alternative Internal Resonance (A.I.R.) is an exclusive Yamaha construction technique that consists of a lightweight resonant wood core sandwiched between two harder tone woods. Sound tubes that pass from the bridge through the body structure transmit string vibrations and create a more resonant sustain.

The RGX5 A2 retails for $939.99 and the RBX4 A2M retails for $859.99.

Features for the RBX5 A2 :

• 5 String A2 Model
  
• Body featuring Yamaha's exclusive A.I.R. (Alternative Internal Resonance) construction
  
• Bolt-on Maple neck with Rosewood fingerboard
  
• 24 Frets
  
• Scale Length: 34" (864mm)
  
• Radius: 10 5/8" (250mm)
  
• Die-cast bridge
  
• 2 x Y.A.S.H. Custom Shop Designed Single Coil Pickups
  
• Controls Front Volume, Rear Volume, Master Tone
  
• L.E.D. Lit Pickup Indicator and Selector