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Yamaha RBX 374

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Page last updated Mar 28, 2026

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Description

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The 4-string RBX374 features the same 3D headstock and radically contoured body shape as the John Myung signature bass. Loaded with a newly designed bridge, humbucking pickups and active electronics (that include two-band EQ), master volume and pickup pan pot, this bass delivers sonic versatility with a powerful tone.

Custom Pickups Twin humbucking pickups feature oversized pole pieces to produce a thicker low-end tone with increased bass response. The pickup covers feature built-in finger rests that are discrete and convenient.

RBX Bridge The heavy diecast bridge transmits string vibration directly to the body for enhanced sustain. Easy adjustability makes the perfect setup easy to achieve.

RBX Body The deeply contoured bodylines incredible comfort, easy access to high frets and stunning looks.

Active Electronics The 4-control active EQ system features Master Volume, Pickup Balance, and a 2-band equalizer for massive tonal variation.

Controls 1: Pickup Balancer 2: Master Volume 3: Bass 4: Treble

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Yamaha RBX 374.

Features and functionality

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The RBX 374 features two humbuckers, providing a robust sound suitable for various genres.
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Mods and upgrades

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Owners recommend replacing the factory preamp with a Glockenklang model to significantly enhance the bass's tonal capabilities.
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Owners often advise against changing the RBX 374 pickups if you like the current sound, suggesting instead to invest in effects pedals or new strings for tonal variety.
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Blue Steel strings are recommended for their brightness and longevity, offering a cost-effective way to enhance sound without modifying electronics.
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Use cases and applications

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Ideal as a "beater" bass for dorm room practice, while more expensive instruments are stored elsewhere.
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For funk and jazz, players suggest experimenting with flatwound strings to achieve a smoother, warmer tone suitable for slapping techniques.
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User experience

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The bass is praised for its smooth playability, thin neck, and well-balanced body, making it comfortable for extended playing sessions.
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Some find the aesthetics of the RBX 374 to be polarizing, despite its strong performance and sound quality.
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Value and pricing

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The RBX 374 is often found on Facebook Marketplace for around $450 CAD, but a better deal would be around $200-250 USD used.
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A new Yamaha TRBX304 can be purchased for approximately $499 CAD, making it a competitive alternative to the RBX 374.
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It's noted that Reverb prices for the RBX 374 are inaccurately high, sometimes listed around $1300, which does not reflect actual market value.
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