Best 18 Inch Subwoofer 2021 : Reviews and Buying Guide

Best 18 Inch Subwoofer 2021 : What is a car without a music system? I remember that dreadful drive I had when my music system was broken, and I had no music to listen to as I traveled 250 miles. Since that day I made sure to add music to my checklist for preparation before I travel in my car. The music keeps you cool and makes sure you are not bored driving.

A simple output speaker is not at all suitable for the music enthusiast. The clarity, loudness and the bass of the songs are the most important things they look into, including me. Some songs/music are meant to be heard in high volume and some in low volume. Some need that additional bass to be extra high and some needs those voice to sound loud. To have all these variations in a single music system, your music system should be installed with all the good components to make sure you get them all right.

Subwoofers are also an important component of the music system, and nowadays, it is the most preferred way to listen to music – with high bass. These are low-end sound-producing speakers that give the beats the deep sound. 18” subwoofers are the right choice for your car and they produce the best bass ever. Having the best and the right one for your car is the right way to enjoy your drive along the coastline or getting a party song at the picnic spot with your friends. Just for that purpose, we have listed the 18” best 5 subwoofers that are perfect for your car. Let us look into them now.

Just want a quick pick without the details? Here are our top 2 picks for

Best 18 Inch Subwoofer

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Best 18 Inch Subwoofer Reviews 2021

#1. Skar Audio ZVX-18v2 D2 18″ 3200 Watt Max Power Dual 2 Ohm SPL Car Subwoofer

With the output of 3200 watts, the ZVX-18v2 model from Skar is a power-packed sub-woofer. It is an 18” sub-woofer, which is also SPL grade and is engineered and designed to give out that powerful yet accurate sound from the music that you play. Users have termed it to be a reliable and powerful sub-woofer and this is all because of efficient and consistent performance. The 18″ sub-woofer has dual 2 Ohm, which means you will get good powerful sound output from it. The sub-woofer has the capacity for peak power of 3200 Watts and an RMS power of 1660 Watts – this is of a high standard across its competitors.

The woofer isinstalled with a massive triple stack magnet that provides a great opportunity for the woofer to produce a powerful sound which in turn gives you the effect of a super base. Along with the magnet is the Copper voice coil that is 8 layered and can withstand high temperature and is of 3” thickness. The subwoofer’s cone is the most important part and, in this case, the cone is made of competition grade paper cone. The cone withstands the high level of vibrations produced by the magnet and the coil, which send it to the foam surrounded by the cone. This high roll foam absorbs all these vibrations from the cone and acts as a shock absorber.

The most important thing that makes the perfect sound in any speaker is the proper airflow in them. This subwoofer has an advanced airflow cooling design that makes it perfect for sound production. The sub-woofer is made in the USA and follows all the necessary standards and makes it perfect for American users.


  • 18” Dual Ohm speaker that is designed to give you the consistent and best sound for your music
  • Peak power is of 3200 Watts and an RMS power of 1600 Watts
  • It has a massive magnet that will ensure the right sounds are produced with clarity
  • The voice coil is 8 layered and has a thickness of 3 inches making it strong enough to interact with the magnetic field
  • The cone is made of competition-grade paper material
  • Advanced airflow design has given the right amount of air to produce the sound


  • The sub-woofer gets too hot quickly

#2. Sundown Audio U-18 D2 18″ Dual 2-Ohm U-Series Subwoofer

Sundown Audio is the brand that brings you the next best sub-woofer and has very good specifications that we will look into now. It is an 18″ subwoofer and is designed to have an RMS of 1500 Watts, and it provides that loud bass easily. This is the U-series subwoofers from the brand and one of the best from them. There are plenty of wiring options provided in these series of the sub-woofers. The round cushion is stitched to the cone and hence provides a great bond between the two. This cushion is then surrounded by the surround bolt-on ring that is engraved with the Sundown name on it.

Each subwoofer comes with foam gaskets that attach to the bottom of the mounting flange to ensure there is a good seal. These U series have been introduced to give good pricing options for the users as their earlier versions are of slightly expensive ones. There are 2 years Sundown warranty that is provided and that is because the subwoofers are made of high-quality material. It has 3 inches of black voice coil that converts the electrical signals into the sound waves. The cast basket is made of high-quality material but not as premium as other series from the brand.

The spacing ring just above the magnet prides a great space of air movement hence keep the coil cool. The magnet is also a high powered one, supporting the best sound output. The magnet also hoards the Sundown name is a very stylish way. There is a cooling plate below the magnet that keeps the temperature in check during its high performance. The depth of the subwoofer is 10.11 inches, which are required measurement for mounting purposes.


  • The powerful magnet makes the subwoofer a heavy and durable one
  • The plate below the magnet absorbs the heat to provide a better performance
  • The reason for the price reduction when compared to the other series from the brand is the usage of different material for the cast basket
  • Black voice coils which are designed for durability
  • Spacing rings to provide good air circulation


  • No cons that we could come across

Final Verdict: Which one would I choose?

With all the subwoofer in a similar price range, the best one I can spot out on the list is the first one on the list. Skar Audio ZVX-18v2 D2 is the one I choose from the list, as it is the best one suited for most of the average-sized car. With the high-quality sound output and the 2 years warranty they provide, it is the best choice to make. It is slightly high priced when compared with a couple of subwoofers on the list of best 18 inch subwoofer for car. If the price is not a great concern for you, then making this choice will not leave you in any guilt.

The next choice purely on the price is the Skar’s 2500Watt subwoofer. It is priced somewhere in the range of $270 – $300 and does have a good quality low-end sound. This is also a high-quality product; hence even if you choose this just based on the price it is no choice to repent on. Happy Buying!

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