Finding a 370z sub box that actually fits without ruining the little cargo space you have is a struggle every Z owner knows too well. If you've ever looked into the back of your car and thought, "where on earth is a subwoofer supposed to go?" you aren't alone. The 370z is a fantastic driver's car, but Nissan definitely didn't design that hatch with a massive audio system in mind. Between the high floor, the strut bar, and the shallow depth, you have to be pretty strategic about how you add some low-end punch to your ride.
Let's be honest, the factory Bose system (if your car even has it) is pretty underwhelming. It's "okay" for a daily commute, but it lacks that deep, resonant bass that makes a VQ engine's soundtrack even better. Adding a dedicated enclosure is the only way to get real performance, but you can't just toss a generic square box from a big-box store back there and expect it to work. It'll slide around, block your rear view, and probably look like an eyesore.
Why the 370z Needs a Specific Enclosure
The trunk of a 370z is basically a shallow tray. Because the fuel tank and the rear drivetrain components take up so much room underneath, the floor is remarkably high. When you add a standard 370z sub box, you quickly realize that anything taller than a few inches starts to interfere with the hatch glass or the privacy cover.
Most people choose the Z because it's a sleek, well-proportioned sports car. The last thing you want to do is ruin the aesthetic with a clunky wooden cube that looks out of place. This is why "vehicle-specific" boxes are so popular for this platform. They are molded or cut to follow the exact contours of the hatch, tucked away into corners or hidden in the floor so you can still carry a gym bag or a small grocery haul.
Stealth Boxes vs. Custom Floor Builds
When you start shopping for a 370z sub box, you'll generally see two main styles: the corner-mount "stealth" box and the false-floor or spare tire well enclosure. Both have pros and cons, and your choice really depends on how much trunk space you're willing to sacrifice and how much bass you actually need.
The Corner Stealth Box
These are usually made of fiberglass and sit in the rear corners of the hatch, right behind the wheel wells. I really like these because they utilize "dead space" that you weren't using anyway. They usually house a single 10-inch or 12-inch subwoofer.
The big benefit here is that the center of your trunk remains wide open. If you need to fit a set of golf clubs or a suitcase, you can usually still slide them in between the boxes. The downside? Fiberglass boxes can be pricey, and if you want dual subs, you have to buy two separate enclosures, which can get expensive quickly.
Spare Tire Well Enclosures
If you're okay with ditching the spare tire (or if you already have a roadside assistance plan and don't care), the spare tire well is the perfect spot for a 370z sub box. By building the enclosure into the floor, you keep the entire floor flat.
This is the cleanest look possible. You can even get boxes that allow the sub to fire upward or downward into the well. Down-firing is a neat trick because it protects the subwoofer cone from anything you might throw in the trunk. You could literally pile luggage on top of the sub and it would still sound great without the risk of puncturing the speaker.
Sealed vs. Ported: What Fits Better?
In the world of car audio, you're always choosing between sealed and ported boxes. For a 370z, sealed enclosures are almost always the way to go.
Here is why: ported boxes need to be much larger to work correctly. They require a specific amount of internal air volume and a physical port tube, which takes up a lot of room. In a car as small as the Z, a ported box usually ends up taking over the entire hatch.
Sealed boxes, on the other hand, can be much smaller. They provide a tighter, more "accurate" bass sound, which really suits the vibe of a sports car. If you're listening to rock, metal, or fast-paced electronic music, a sealed 370z sub box will give you that snappy kick-drum feel without the "muddiness" sometimes associated with cheap ported designs.
Materials: MDF vs. Fiberglass
You'll see a lot of debate about whether your 370z sub box should be made of Medium Density Fiberboard (MDF) or fiberglass.
MDF is the industry standard. It's heavy, dense, and great for acoustics. However, it's also rigid. Since the Z has so many curves in the hatch area, an MDF box is usually going to be a simple rectangular shape, which doesn't always look integrated.
Fiberglass is much more flexible—not in terms of vibration, but in terms of shape. A builder can mold fiberglass to the exact curve of your car's interior panels. It's also lighter than MDF. In a car where performance matters, saving 10 or 15 pounds on a sub enclosure isn't a bad idea. Just keep in mind that a poorly made fiberglass box can be thin and "ringy," so you want to make sure it's built thick enough to be sturdy.
Don't Forget the Hatch Struts
This is something a lot of people overlook until it's too late. The 370z hatch is heavy, and the factory struts are well, they aren't the strongest. Even from the factory, many Z owners find their hatch won't stay up in cold weather.
When you add a 370z sub box and an amplifier, you're adding weight. If your box is attached to the hatch or if you're leaning over the trunk a lot to tune your setup, those weak struts are going to become a massive pain. Many people end up upgrading to heavy-duty aftermarket hatch struts once they install a sub. It's a cheap upgrade (usually around $60-$80) and it saves you from getting hit in the head by a falling trunk lid while you're trying to show off your new setup.
Dealing with Rattles
Let's be real: the 370z isn't exactly a Lexus when it comes to cabin quietness. It's a raw sports car, and that means it has its fair share of plastic panels that love to rattle. When you drop a 370z sub box in the back, those rattles are going to get much worse.
The most common culprit is the plastic trim around the strut bar and the rear hatch plastics. While you're installing your sub box, it is a very good idea to lay down some sound-deadening material (like Dynamat or similar brands). You don't have to do the whole car—just focusing on the hatch floor and the areas where the box touches the car will make a world of difference. It keeps the bass inside the car and prevents your Z from sounding like a vibrating tin can to people standing outside.
Choosing the Right Subwoofer for Your Box
The box is only half the battle; you also need a sub that's designed to work in small spaces. Since most 370z sub box designs are shallow, you'll likely be looking at "shallow mount" subwoofers.
In the past, shallow subs sounded pretty bad—they lacked the "throw" or excursion needed for deep bass. But modern technology has come a long way. There are plenty of 10-inch and 12-inch shallow subs now that can absolutely pound while only requiring 3 or 4 inches of mounting depth. Just make sure you check the "mounting depth" spec of the box before you buy the speaker. There's nothing worse than getting your new box in the mail only to realize your subwoofer is half an inch too tall to fit inside it.
Final Thoughts on Your Setup
At the end of the day, adding a 370z sub box is one of the best quality-of-life upgrades you can give yourself if you love music. It fills out the soundstage and makes those long drives a lot more enjoyable.
Whether you go with a custom fiberglass corner unit or a hidden spare tire well setup, just remember to keep it secure. You don't want a heavy wooden box flying around if you decide to take a corner aggressively—and let's face it, you're driving a Z, so you definitely will. Stick to a design that matches your needs, keep the weight in mind, and you'll have a setup that sounds as good as the car looks.