Osaki OS 4000 Review
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If you are an avid fan of massage chairs, you probably have come across Osaki several times before. Perhaps the name rings a bell to you. The company is one of the most popular and leading distributors of electronic massage chairs and other similar devices.
But are Osaki chairs, particularly the OS 4000, worth your money? This review is going to help you figure that out as we tackle its features, the benefits it offers, some of its drawbacks and what the real customers had to say when they used this product. You can also compare it with other models from the Osaki in our brand review.
We will leave the decision-making aspect to you but we will try our best to guide you as you make that critical decision. We will also try to answer the most common inquiries that customers have about the product. Here is what we think about the Osaki OS 4000.
Main features
Osaki is one of the brands of massage chairs that put great thought on the features they include in each massage chair model. They packed some excellent features in most of its models.
The Osaki OS-4000 has a range of four different models equipped with features that vary from one model to the other. The chairs provide a variety of features—from the serious user to the hobbyist—making Osaki one of the most reliable brands.
And for its price, you would want to go for it. Here are the main features of the Osaki OS-4000 that all of the models under it have in common:
Zero Gravity Feature
The Osaki OS-4000 has two levels of zero-gravity, which is a significant feature, providing the benefits of a deeper, more thorough tissue massage. It helps in relieving pressure from the spine and enables the muscle to relax.
Through this feature, the chair reclines and raises the legs, placing the user in a completely weightless position. That means your body is on relaxed mode.

This position delivers excellent health benefits to the body such as relief of pressure from the spine, back and neck relaxation, minimized heart pressure as well as promotes good blood circulation and lung function.
Advanced Body Scan Technology
The Osaki OS-4000 is designed to scan the body automatically with just one press. The rollers automatically adjust according to the width and height of the user to ensure the right fit, making the massage experience perfect for anyone.
Combined with the S-Track massage robot feature, this massage chair can focus on problem areas of the body such as the neck, lumbar regions, and shoulder to improve your massage experience.
Ergonomic S-Track
The OS-4000 is designed in such a way that it will follow the natural curve of the vertebrae. This offers better support for the back and neck, particularly the lumbar region.
This enhances the effect of the massage to the body as it allows the discs of the spine to part and decompresses individually. As a result, the disc tissues will be able to get more nutrients.
Next Generation Air Massage
This massage chair has 38 total number of improved next-generation airbag technology. You might find the number of airbags less impressive, but it is actually better that way since the surface area and volume of the massage is increased.
This reduces the amount of stress on the chair, allowing for a longer lifespan and better functionality. Through the next generation air massage feature, it is easy to see why it is one of the most mechanically sound chairs available in today’s market.
The rest of the features that the Osaki OS-4000 has will be discussed in the other parts of this review. Meanwhile, we will start comparing the strengths and weaknesses of this massage chair model.
Pros and cons
The pros and cons can define the ability of the chair to provide the user with the massage experience that they are hoping to get. The Osaki OS 4000 has an impressive number of strengths and only a few weaknesses that some customers do not see as a huge problem.
Pros
Cons
Detailed review
advanced technology
The Osaki OS-4000 full-body massage chair uses advanced technology and offers an extensive array of exclusive and reliable features. It uses a sophisticated and updated airbag system that simulates the touch and feel of human hands.
This creates a more in-depth, more relaxing massage experience that lets you forget about stress and puts you in a relaxed state. This massage chair is designed to reduce gravitational compression on the back area of the user and engineered to provide the user with ultimate convenience through its easy to perform intensity and speed adjustment functions.

Its state-of-the-art body scan feature ensures that you are getting a massage that is perfect for the shape of your body. Physical looks-wise, the Osaki OS 4000 is a massive chair but with parts that are all functional and are in their right places.
It easily fits on the décor of your home because of its modern design. The chair is beautifully upholstered and is an upgrade of its previous version.
smarter version
Some of its remarkable features include Zero Gravity, Body Scan Technology, 30-inch Roller Stroke, seat vibration, full-body air massage, and back heat therapy.
Osaki made it easier for users to customize their massage the way they want it through its five unique auto programs such as circulation, healthcare, relax, smart, and demo. Creating the massage experience that is perfect for the moment is possible with just a touch of a button.
You can even make various combinations of massage with six massage techniques such as Swedish, Shiatsu, Clapping, Kneading, Rolling, and Combo. And you can adjust the speed and intensity of the massage according to your needs through its easy to operate settings. As a result, you will have full control of your massage and experience it simply the way your heart and body desires.
more special features
The Osaki OS-4000 is rich in excellent features, something that will draw you into opting for this massage chair. Starting with its Zero Gravity position feature that relieves spine compression and is particularly beneficial for users who have issues on their neck and back area.
This technology offers a weightless experience to the user and helps in the proper back alignment as well as improves lung function and reduces stress on the heart.
The S-track design

This is engineered to help users who are suffering from spinal issues. The S shape, which is the natural form of the backbone, offers excellent support to the lumbar area.
The ergonomic track shape of the massage chair is also intended to give the users with naturally stead sitting experiences while facilitating in the correction of any misalignment that the user may have in their back area.
The Airbag Technology

The equipped in this Osaki chair is also a significant improvement to what it had before. Some users complain about how bulky airbags make their sitting experience slightly uncomfortable.
Osaki designed this chair to have a widen coverage area without adding more airbags. This results in a seamless massage motion.
The Lower Back Heat Therapy

You will also find the lower back heat therapy feature to be a pleasing one. The chair comes with two heating pads placed on the lower back portion of the massage chair. The heating pads aids in the relaxation and recovery of the muscles.
Computer Body Scan System

You will surely be impressed with its computer body scan system the way it impressed us. The massage chair has dual rollers that scan the body of the user before the start of the massage session.
The device will adjust the positioning as well as intensity to ensure that the user is getting the best massage experience based on their body size. This innovative feature tweaks the mechanism to the figure and dimensions of the user.
Foot and Calf Massage

The Osaki OS 4000 also comes with newly designed foot and calf scanning technology that adjusts according to the length of the user’s leg, therefore, ensuring that the leg muscles are targeted by the airbags properly.
There are two controllers that are equipped in this massage chair. The main controller offers a user-friendly interface for convenience and natural control of every function of the massage chair. The second controller comes in the form of a wireless remote that lets the user operate the chair based on its function, especially when it is reclined.
Specifications
Voltage | 110-120V |
Frequency | 50/60 Hz |
Main Body Dimension | 52" x 31" x 34" |
Vertical Side | 38" x 25" x 15" |
Gross Weight | 255 lbs |
Customers are saying
There may have been promising features of the Osaki OS 4000 but based on customer reviews; some were not pleased with the way the features worked. They wished for improvement, especially in terms of durability. The lack of foot massage was one of the most common complaints that customers have about this chair.
One user expressed his thoughts on the chair after a week of use. According to him, the chair could have been better in providing back massage. Even the controller is something that they believe to be necessary of major tweaking due to its flaws such as the small print on the buttons. He said that they don’t recommend using the chair in a dim room or area. Other than that, he had no more issues about the chair.

But many other users were satisfied with the chair. They were able to get the relief from the muscle pain that they need. They find the way the chair is made to be excellent.
All in all, the chair received excellent feedback from its users. And just like the other users, we also hoped that the major issues would be immediately addressed in its upcoming models. We also feature this model on our list of best massage chairs here.
Common Questions
Are there intensity settings for the rollers?
Yes, it comes with adjustable intensity levels. You can choose from the very relaxed to more intense massage.
What is the weight and height limit of this massage chair?
People who are 6 feet tall should feel comfortable with the chair. The weight that the chair can accommodate is only up to 230 pounds.
Is it difficult to assemble the chair?
You won’t have a hard time assembling the chair.
Is it heavy to carry or move around?
One of the significant problems the chair has is its heavyweight, which might give you trouble if you wish to move it to another area of your home. It is particularly huge as well, which requires more muscles if there is a need to move it.
What is the dimension of this chair?
The main body dimension is 52 X 31 X 34 (LWH) inches.
Conclusion
The current features of the Osaki OS 4000 are great and revolutionary. Some improvements have been made by the company but they missed out on a few other features that many customers were expecting to get.
It is all in all a good choice. But if you are looking for one that is packed with more advanced features, you can opt for high end and more expensive chairs.