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Description & Condition
JIENIE BASSES is a custom bass brand launched in 2023.
The Custom Shop Series maintains a unique style while allowing for extensive customization of features like scale, neck shape, and head size.
In contrast, the newly launched Essential Series is characterized by specifications based on the brand's ideal balance and a streamlined design.
This model, the MJ-5, was conceived ten years before the brand was founded. It was inspired by the 5-string JB.
While incorporating a 5-string style, the sound retains the JB's inherent character, while adding high playability and convenience for the modern musician.
The body is made of ash, the neck is maple, and the fretboard is maple, creating a classic configuration.
The neck is thin and slender, minimizing mass as much as possible. This results in a sound that closely resembles a 4-string bass.
The neck is reinforced with carbon fiber only near the joint with the body. Since the strength drops significantly at the joint, this reinforcement prevents warping from there.
Reinforcing the entire instrument would have significantly altered the sound, so minimal processing was used.
The head, like the JB, is based on a stepped design, with minimal angle adjustment and head thickness settings.
This eliminates parts like tension pins, and the strings contact the nut at a minimal angle.
This design eliminates unnecessary elements, allowing the strings to vibrate more freely and with richer harmonics.
The body shape is designed with smooth, three-dimensional curves, resulting in a snug fit and a sophisticated look.
While there's no pickguard, the spacing between the body top and the strings is set to be nearly identical to that of a standard JB.
Overall, you'll experience the comfortable body balance, fit, and excellent playability characteristic of the JB style.
The bridge and tuning machines are made with HIPSHOT, high-quality hardware that's extremely lightweight and free of waste.
The pickups are single-coil pickups custom-ordered from Delano. We aimed to avoid over-increasing the number of turns, and instead capture the characteristic treble nuances of a four-string bass.
The preamplifier was designed in-house and manufactured by KarDiaN. Designed for use with passive tones, it features a dedicated two-band boost EQ.
The bass boost densely fills the 40-70Hz range, while the treble boost adds a vibrant 4-10kHz presence. By boosting these two components sufficiently, the frequency range around 500Hz feels relatively cut.
The passive tone combined here plays a crucial role.
By using the passive tone before the PU passes through the active circuit, the high frequencies are suppressed, resulting in the powerful high-mid characteristic of a passive device. This is purely for the purpose of creating a high-midrange, and any excess or deficiency in the high range is compensated for with EQ.
The MJ-5's sound is completed by combining the PU, preamp, and passive tone, all designed with a clear concept in mind.
The thickness and attack of a passive JB, the powerful low and high ranges typical of a JB, and the treble texture of a 4-string bass despite being a 5-string. The JIENIE MJ-5 embodies these characteristics.
◯SPECS
Body: Ash
Fingerboard: Maple
Neck: Maple 1P
Scale: 34 inches
Nut width: 46mm
Nut: Bone
Fret: 21F (214)
Bridge: HIPSHOT Style B Aluminum 18mm P Tuning machine: HIPSHOT Ultralite 1/2"
Pickups: Delano JIENIE custom single coil
Preamp: JIENIE 2-Band EQ boost
Controls: Neck PU Volume, Bridge PU Volume, Passive Tone (Push/Pull - Preamp on/off), Treble Boost, Bass Boost
GIB's skilled technicians will set up your guitar for easy playability before sending it to you.
Accessories: ROSIE Ultralight Bass Guitar Case
Written by: Shunsuke Saga
Photos: Hyeon
〇 Shipping & Warranty Information
This item comes with a GIB 3-month warranty.
It will be securely packed in a sturdy hard cardboard box for safe delivery.
International shipping is available, and shipping is free.
Please note that customs duties, taxes, and any additional import fees are the buyer’s responsibility.
In the event of a return, all shipping costs (including return shipping) and any customs or import fees will be borne by the buyer.
〇 Contact
Phone: +82-507-1361-2914
Price includes VAT & Duties & Shipping Fee

At Geek in Box, we're dedicated to connecting musicians with their perfect instrument, no matter where they are. That’s why we’ve eliminated the barrier of shipping costs. We are thrilled to offer free and fast international shipping on all orders, to every country.
Even better, all prices shown on our site are final.
They include VAT, duties, and shipping fees—so there are no additional charges after purchase.
Our Commitment to Excellence:
Shipping from our home in Japan, we bring a level of care and precision to logistics that is second to none. With a track record of over 10,000 successful international deliveries, we have perfected the process.
Expert Packaging:
Your bass will be securely packed using durable, high-quality materials to ensure it arrives in flawless, ready-to-play condition.
Seamless Customs:
We expertly handle all necessary procedures for smooth customs clearance, preventing unnecessary delays.
We entrust your valuable order to the world's most reliable carriers, FedEx, ensuring your new instrument arrives safely and swiftly.
Shop our collection today and experience the confidence of knowing your dream bass is just a click away—with the shipping on us.
1. Our Total Satisfaction Promise
On Condition & Functionality: In the rare event that your instrument arrives in a condition different from our detailed description, or if it has any operational issues, we offer a 100% full refund. We will also arrange and cover the cost of return shipping.
On Personal Preference: Finding the perfect bass is a personal journey. If the instrument you receive isn't the right fit for your hands or your sound, you are welcome to return it. In this case, we will refund the full purchase price of the item; we simply ask that you cover the return shipping costs.
2. The GIB Buy-Back & Upgrade Program
We see our clients as partners in music. Your musical needs may evolve, and we want to support that journey. That's why we created a revolutionary program that protects your investment and makes it easy to upgrade.
Guaranteed Buy-Back: Should you ever decide to part with a bass purchased from us, we guarantee to buy it back.
Used Basses: We will repurchase at 70% of your original purchase price.
New Basses: We will repurchase at 50% of your original purchase price.
Your Upgrade Bonus: When you are ready for your next instrument, our program offers even more value. If you use our buy-back service to trade up to another bass in our collection, you will receive an additional 10% discount on your new purchase.
This unique program provides an unparalleled safety net, ensuring the lasting value of your instrument and creating a seamless, rewarding path for your evolution as a musician.
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