1 vs 2 Subs in a Crew Cab Truck

So you drive a crew cab truck. You love bass. And now you’re stuck wondering — do you go with one subwoofer or two?

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It’s a fair question. A lot of people get confused here. They think more subs always mean better sound. But that’s not always true. The right answer depends on your truck, your goals, and your budget.

This guide breaks it all down in plain, simple terms. By the end, you’ll know exactly what setup fits your ride.

First, Let’s Talk About Crew Cab Trucks

A crew cab truck is the biggest cab style you can get. It has four full-size doors and a real back seat. Think of trucks like the Ford F-150 SuperCrew, Chevy Silverado Crew Cab, Ram 1500 Crew Cab, or the GMC Sierra Crew Cab.

These trucks have a lot of interior space. That’s great for passengers. But it also means your audio system has a much bigger area to fill with sound.

This is why the 1 vs 2 sub debate matters so much in a crew cab. A small hatchback doesn’t have this problem. But a crew cab truck? It needs more thought.

What Does a Subwoofer Actually Do?

Before we compare setups, let’s get the basics right.

A subwoofer is a speaker built for low frequencies. We’re talking bass — the deep, chest-thumping rumble you feel more than you hear. Regular door speakers and tweeters can’t reproduce those low-end frequencies well. That’s the subwoofer’s job.

When people talk about car audio bass, they’re talking about frequencies between 20 Hz and 200 Hz. A good sub handles that range cleanly. The rest of your speaker system handles the mids and highs.

Good bass doesn’t just make music louder. It makes it fuller. More real. More alive.

The Single Subwoofer Setup

Running one sub in a crew cab truck is the most common entry-level setup. It’s simple, affordable, and still delivers a big improvement over stock audio.

What You Get with One Sub

One sub gives you clean, solid bass. If you pair it with a quality amplifier and a well-built enclosure, a single 12-inch or 15-inch subwoofer can do serious work. You’ll feel the difference immediately after swapping out a factory system.

Most beginners start here. It’s the smart move if you’re new to car audio or working with a tighter budget.

Placement in a Crew Cab

In a crew cab, the most popular spot for a single sub is behind the rear seat. Some people also put it under the rear seat or in the bed. Behind the rear seat is the sweet spot for most builds.

That rear cabin area works well for bass. Low frequencies are omnidirectional — they bounce around and fill the space. So a single sub placed behind you can still reach the front seats easily.

Enclosure Types for a Single Sub

The box matters just as much as the sub itself. Two main types:

Sealed enclosure: Tight, accurate bass. Great for rock, country, jazz, and music where you want clean low-end without too much boom. Takes up less space too.

Ported enclosure: Louder and more dramatic bass. Uses a tuned port or slot to boost output at certain frequencies. Great for hip-hop, EDM, and heavy bass music. Takes more space but hits harder.

For a crew cab truck with a single sub, a ported box behind the rear seat is a very popular choice. You get loud, punchy bass without completely sacrificing rear seat comfort.

Pros of One Sub

Lower cost for the sub, amp, and enclosure
Easier installation
Takes up less space — rear passengers still have legroom
Enough power for casual to serious listening
Simpler wiring setup

Cons of One Sub

May not fill the full cab space as evenly
Can sound slightly one-sided if placement isn’t ideal
Less output headroom at high volumes

The Dual Subwoofer Setup

Two subs means double the cone area, more air displacement, and more bass output. But it also means more complexity, more cost, and more space used up.

Let’s break this down honestly.

What You Get with Two Subs

Two subwoofers give you more volume and more even bass distribution. When you have one sub, the bass comes from one point in the cab. Two subs spread the sound better. The bass feels more balanced from driver seat to passenger seat.

Two smaller subs — like a pair of 10-inch woofers — can actually outperform a single larger sub in certain ways. They move more air together, and their enclosures can be more compact individually.

Common Dual Sub Configurations in Crew Cabs

Two 10-inch subs: These fit nicely in crew cab builds. Slim ported or sealed enclosures can slide behind the rear seat. You get good output without completely wiping out rear passenger space.

Two 12-inch subs: This is where things get serious. You’ll likely need a custom enclosure. Rear seat passengers may have limited legroom. But the output and sound quality can be fantastic.

Two 15-inch subs: This is a full-on build. Custom fabrication usually required. Great for competitions or people who want maximum bass performance and don’t need the rear seat for passengers.

Ported vs Sealed with Two Subs

Same rules apply. Sealed = tight and accurate. Ported = loud and punchy. With two subs, a ported enclosure with dual chambers (one port and chamber per sub) is often the best option. It keeps the subs performing at their best individually while still sharing the same box structure.

Some builders go with a shared ported chamber for two subs. This saves space. But it requires careful tuning to avoid port noise or uneven loading.

Pros of Two Subs

More bass output overall
Better left-right balance throughout the cab
More even bass response across all seating positions
More impressive for demos and listening sessions
Can handle more amplifier power before distorting

Cons of Two Subs

Higher cost for subs, bigger amp, larger enclosure
Takes up more space behind or under rear seat
More complex wiring
Harder to tune properly
Overkill for casual listeners

Head-to-Head: 1 Sub vs 2 Subs

Let’s put them side by side so you can see the comparison clearly.

Factor	1 Sub	2 Subs
Bass output	Good to great	Great to extreme
Sound balance	Decent	Better
Cost	Lower	Higher
Space used	Less	More
Wiring complexity	Simple	More involved
Best for	Budget builds, daily drivers	Enthusiasts, serious systems
Enclosure options	Sealed or ported	Dual sealed or ported

Does More Mean Louder? Let’s Clear That Up

People often think two subs = twice as loud. That’s not exactly right.

In car audio, doubling your subwoofers (and keeping the same wattage per sub) adds about 3 dB of output. That’s noticeable, but it’s not like flipping a switch to double mode. Real-world loudness is about more than just the number of drivers.

The amplifier power, the enclosure design, the sub’s sensitivity rating, and the tuning all play huge roles. A single well-built 15-inch sub with a proper ported box and a strong amp can outperform two 10-inch subs in a poorly built box with an underpowered amp.

The lesson: Quality of the build matters more than quantity of subs.

How Much Amp Power Do You Need?

For a single 12-inch sub rated at 500 watts RMS, a 500–600 watt RMS amp is your sweet spot. Don’t underpower your sub. That leads to distortion, which actually damages subs faster than overpowering them.

For two 12-inch subs at 500 watts RMS each, you need at least a 1000–1200 watt RMS amp. A monoblock amp (single-channel amplifier built for subwoofers) works best here.

With a dual sub setup, you have two main wiring options:

Two separate single-channel amps: One per sub. Great control. Higher cost.

One high-power monoblock amp: Wire both subs to it. More common. Works great if your amp has enough headroom and your impedance load is correct.

Impedance and Wiring — Keep It Simple

Subs come in 2-ohm and 4-ohm versions, and many have dual voice coils (DVC). How you wire them changes the load your amp sees.

With two 4-ohm DVC subs wired in parallel, you get a 1-ohm load. Many mono amps can handle 1 ohm. This gives you maximum power transfer.

With two 2-ohm DVC subs, wiring them in series per sub and then in parallel gives you a 2-ohm final load. Stable and clean.

Don’t just guess at this. Look up a wiring diagram for your specific sub model. Incorrect wiring can damage your amp or subs.

What About Sound Quality vs Sound Pressure Level?

This is a big topic in the car audio world.

SQ (Sound Quality) builds focus on accurate, natural-sounding bass. Clean notes, realistic instrument reproduction, and balanced frequency response. Usually a sealed enclosure with a moderate sub and quality amp.

SPL (Sound Pressure Level) builds focus on maximum loudness. Ported boxes tuned low, powerful amplifiers, and sometimes multiple large subs. These builds win competitions but aren’t always the most “musical” setups.

Most daily drivers fall somewhere in between. They want bass that hits hard during their commute but also sounds decent when they’re listening to an acoustic playlist.

For SQ-leaning setups, one quality sub in a sealed box is often the move. For SPL-leaning setups, two subs in ported boxes are hard to beat.

Real Talk: Space in a Crew Cab

Let’s be real about space. A crew cab has a backseat that people actually use. You might carry your kids, your crew, or your gear back there.

One sub setup: A sealed or ported single-sub box can slide behind the rear seat without major disruption. Passengers still have legroom. The seat still folds up or back normally in most builds.

Two sub setup: You start running into space issues. Two 12s in a ported box? That’s a large enclosure. Passengers in the back seat will notice. You may need to keep the seat folded up, or design a custom enclosure that mounts under the seat or fits flush into the rear wall.

If you have kids or regularly carry passengers, seriously think about whether two subs makes sense for your daily use.

Budget Breakdown

Here’s a rough idea of what you’re looking at for both setups:

Single Sub Build (Mid-Range)

12-inch subwoofer: $80–$200
Mono amplifier (500W RMS): $100–$200
Enclosure (sealed or ported): $50–$150
Wiring kit: $30–$60
Total: $260–$610

Dual Sub Build (Mid-Range)

Two 12-inch subwoofers: $160–$400
Mono amplifier (1000–1200W RMS): $150–$350
Dual enclosure: $100–$250
Wiring kit: $40–$80
Total: $450–$1080

These are rough estimates. You can go budget or go premium. Brands like Rockford Fosgate, JL Audio, Skar Audio, Sundown Audio, and Kicker all make quality subs at various price points.

Who Should Pick One Sub?

Go with one sub if:

You’re new to car audio
You’re on a budget
You regularly carry rear passengers
You want clean, solid bass without extreme output
You prefer a simpler, easier-to-install setup
You drive mostly at moderate volumes

A single 12-inch or 10-inch sub with a proper amp and a good enclosure will absolutely transform your sound system. Don’t underestimate it.

Who Should Pick Two Subs?

Go with two subs if:

You want serious bass output
You mainly drive solo or with one front passenger
You’re building a dedicated audio system
You’re into car audio as a hobby
You want even bass coverage across the full cab
You don’t mind spending more and doing more complex work

Two subs done right is a completely different experience. The bass fills the cab evenly and hits with authority. If that’s what you’re after and you’re willing to put in the effort, it’s worth it.

Pro Tips for Either Setup

Use a bass blocker on your door speakers. A high-pass filter stops low frequencies from going to your door speakers. They’ll sound cleaner, and your sub handles all the bass work.

Set your amp gain by ear or with a multimeter, not just by turning knobs. Improper gain causes distortion and blows subs.

Use quality power and ground wire. A cheap wiring kit causes voltage drops and noise. Use at least 4-gauge wire for amps over 500 watts.

Deaden your doors and floor. Sound deadening material like Dynamat or cheaper alternatives reduce road noise and resonance. Your bass will sound tighter and cleaner.

Tune your subsonic filter. If you’re running a ported box, set a subsonic filter about 10 Hz below your box tuning frequency. This protects your sub from over-excursion at ultra-low frequencies.

Final Answer: Which One Should You Get?

Here’s the bottom line.

Start with one sub if you’re new or on a budget. A well-built single sub system in a crew cab truck will blow away any factory audio setup. Do it right and it’ll sound fantastic.

Level up to two subs when you’re ready for more. Once you’ve had a single sub system and want more output, better balance, or a more impressive build, go dual. You’ll know when you’re ready.

The crew cab truck gives you space to work with. Use it wisely. Whether you go with one sub or two, focus on the quality of the build — the right amp, the right box, and the right tuning — more than just the number of subs you put in.

Bass hits harder when it’s done right. That’s the real secret.

Quick FAQ

Can I run two different subs? It’s possible but not ideal. Matching subs perform more predictably together. Mix-matching can cause phase and impedance issues.

Does the direction the sub faces matter? For daily use in a crew cab, not dramatically. Sub-facing backward (toward the rear) and port-facing backward is a common and effective setup for behind-seat builds.

Is a bandpass enclosure worth it? Bandpass boxes are loud in a narrow frequency range. They’re not great for most music because the bass sounds boomy and one-note. Stick with sealed or ported for general listening.

Do I need a capacitor? If you have a quality alternator and a properly sized power wire, probably not. Capacitors are often oversold as a cure-all. A bigger alternator or second battery is a better investment for extreme builds.

Can I add a second sub later? Yes, many people start with one and add another when budget allows. Just make sure your amp has enough headroom, or plan to upgrade it when you add the second sub.

That’s everything you need to know about running one vs two subs in your crew cab truck. Pick the setup that fits your life, do the build right, and enjoy the ride.