Yamaha TRBX504 4-String Bass Guitar in Translucent Brown

Here's what Yamaha have to say: 

The TRBX500 bass guitar is all about Tone.
Premium mahogany construction and an ultra-musical active/passive pre-amp design deliver the flexibility and sheer tonal quality to allow you to sculpt the perfect sound for your music.

Features:

• Body: TRBX features a sculpted solid mahogany body, with a mass-optimized 3D design for the optimum balance between tone and comfort coupled with perfect weight distribution.
• Neck: TRBX’s neck design combines a fast, ultra-comfortable profile with 5-pc maple/mahogany laminated construction for outstanding stability and excellent tone.
• Pickups: YGD designed H5 pickups are defined by a clean, open tone that’s perfectly matched with the flexibility of the active/passive preamp design. Their quad-polepiece design and alnico magnets give them the power to drive the active circuit and the sensitivity and subtlety to capture every nuance in passive mode.
• Electronics: Active/Passive selecter, Battery Alert）
• TRBX500 models feature an audiophile-grade active/passive circuit for fine tonal control and extreme flexibility. The advanced design offers a level-matched output whether in passive or active mode and tone-switching circuitry that seamlessly moves from treble control to master passive tone. High-quality gold plated parts are used for key signal chain contacts, providing increased conductivity and reliability and a battery alert LED installed on the back panel gives instant indication of low power to eliminate sudden power loss during performance.
• Neck Joint: TRBX uses a precision fitted bolt-on neck joint for maximum adjustability and clear, punchy tone. Developed through hundreds of hours of play-testing, the refined neck joint shape perfectly balances strength, vibration transfer and upper-fret access.
• Bridge: A high-mass die-cast bridge efficiently transfers string vibrations to the body for full, rich tone combined with excellent adjustability and road-tested durability. 19mm string spacing on the 4-string model offers outstanding playability for technical slap or finger styles.
• Headstock: Straight string pull from nut to machine head eliminates lateral tension, providing superior tuning stability and reducing overtones.
• Nut: 38mm (4-string) nut widths give fast, comfortable playability for any style.
• Output Jack: Yamaha’s metal plate-mounted standard jack socket offers superior durability and easy maintenance.

Specifications

• Scale Length 34'' (863.6mm)
• Neck Maple and Mahogany 5pc
• Fingerboard Rosewood
• Radius 10'' (250mm)
• Nut Width 38mm
• Body Solid Mahogany
• Tuners Die-cast
• Bridge Die-cast 19mm
• Pickups HHB5n (Alnico V), HHB5b (Alnico V)
• Controls Master Volume, Pickup Balancer, Bass, Middle, Treble and Active-Passive switch (Battery Alert LED on back)
• Hardware Colour Black Nickel