In most cases, a multiple subwoofer setup will give better overall results. The main reason is that multiple subs help create a more even bass response throughout the room, which means the bass will sound more consistent across different listening positions. It also helps reduce nulls and peaks caused by room acoustics.

Because of that, I usually recommend trying a multi-subwoofer setup if possible. If your local dealer allows it, it’s worth asking if you can borrow a demo subwoofer to try at home before making a final decision. Testing them in your own room is really the best way to see what works for your setup.

Note: It is recommended to have similar subwoofers but is not a must. But the more alike they are the easier the setup/tuning will be.

Advantages of Multiple Subwoofers

• More even bass across multiple listening positions
• Lower Distortion & Cleaner Sound
• Less strain on each individual driver(More Headroom)
• Improved Musical Accuracy
• Better interaction with room acoustics
• More flexibility when it comes to placement
• Fewer nulls and peaks in the frequency response
• Better Home Theater Experience

Disadvantages of Multiple Subwoofers

• Less Punch in smaller Subs
• Most likely higher cost
• 2 subs demand alignment and phase tuning.(Normally not too complicated)
• 4 subs demands more tuning to get the perfect setup(Demands normally several hours to tune)

Advantages of One Subwoofer

• Moves more air
• Can provide deeper bass extension
• Often better suited for larger rooms
• Typically paired with a more powerful amplifier
• Strong control in the lowest frequencies
• Can deliver stronger punch and impact

Disadvantages of One Subwoofer

• You will always have one or several nulls no matter where you sit
• Hard to place due to a big Speaker box
• Heavy to move around 

At the end of the day, both approaches can work well, but if your goal is smooth, consistent bass across the room, multiple subwoofers are often the better solution.