Best 8 Inch Subwoofer Of 2018 & Buying Guide

There are many car speaker sizes on today’s market, but you can only choose the size that is compatible with your car factory-installed speakers. One of the most popular dimensions is the 8-inch speaker size. Knowing the size of your car speakers isn’t enough.

You need to choose an 8-inch speaker that will be your ultimate source for quality sound. You have to visualize the best models, as mood changers. The 8-inch sound driver you settle for should be able to transform your in-car audio experience.

Remember, the size (8-inch) is per your car’s sound driver specifications, but the quality is different. Your search has to be comprehensive. You shouldn’t just settle for a speaker because it is an 8-inch and looks amazing.

The list of the best 8 inch subwoofer reviews narrows down your search to five models that we recommend to be the best. We came up with the list after taking into consideration crucial design and performance features.

Things to Consider Before Buying

You will never run out of choices of the best 8-inch subwoofers, but there are several things that you need to look out for. The following are the major concerns that you should address.

Single or Dual Voice Coil – Which is the Better?

8-inch subs are available in single and double voice coils. They also do have different impedance ratings. Usually, most models will connect to your amp in stereo or mono. The stereo connection involves a positive and negative for both right and left channels to an amp.

On the other hand, a mono connection is a bridge of two stereo connections to produce a single mono output channel. Normally, you will need a mono connection when you want more power out of your bridgeable amplifier.

You can wire two single voice coil subs or a dual voice sub in series or parallel to your amp. What is important here is the type of connection and the number of subwoofers used. The type of connection you need depends on the final impedance required at the amplifier.

You need a parallel connection to lower the impedance, and consequently, gain more power out of your amplifier. Then again, you need a series connection to raise the impedance for it to match the amp’s impedance.

BONUS TIPS: You should realize that the number of voice coils does not have much effect on the general performance, but it plays a big role in helping you achieve the required impedance that will not underutilize or damage the amplifier.

What is the Suitable Power Handling?

Power handling of an 8-inch subwoofer is a very important consideration. Manufacturers include two values for power handling under the specifications, which includes the maximum or peak power and the RMS or continuous power.

Peak Power


The peak value is the maximum power your sub can sustain for a given duration of time.

The RMS value is the continuous power your sub will sustain without damaging.

Between the two values, the RMS is what matters the most. You have to get the RMS value right because it is the power that will determine how long you will be entertained by quality music in your car. The peak power will definitely play its part for as long as possible.

What about the General Performance?

Once you get the impedance and power handling right, you must make sure that the other performance features are the finest. The sensitivity and frequency response range have to be good.

Most 8-inch subwoofers have a sensitivity level that ranges from 80 decibels to 90 decibels. So, go for the one with the highest possible sensitivity, because it will guarantee you louder volume. Apart from the sensitivity, you need good bass which you can achieve if your subwoofer can hit lower frequency.

Most 8-inch subwoofers have a frequency response of 20 Hz to 500 Hz. To achieve deeper bass sound, you should consider subs that have a lower frequency of up to 20 Hz, but 50 Hz or less will do just fine.

Another important attribute that contributes to a sub’s efficiency is the design. Choose an 8-inch subwoofer that features quality cone and surround materials. The materials determine the excursion and linearity of the woofer.

Top 5 Best 8 Inch Subwoofer Reviews

1. Rockford P3SD48 P3 Shallow Mount 8-Inch Subwoofer Review

Product Highlights

  • 8-inch design
  • Shallow mount subwoofer
  • Mounting depth of 2.66 inches
  • Dual 4-ohm nominal impedance
  • 2-inch voice coil diameter
  • Dual voice coil
  • 300 watts peak, 150 watts nominal power range
  • 38 Hz – 250 Hz frequency
  • 82 dB sensitivity
  • Anodized aluminum cone
  • M-Roll Santoprene surround
  • 75 Cu. Ft. Vented enclosure
  • 25 Cu. Ft. Sealed enclosure

The Rockford P3SD48 is a well-engineered 8-inch shallow mount sub that will deliver a powerful punch. This is the ideal 8-inch sound driver to consider if you have limited space in your car. The mounting depth of 2.66 inches is remarkably shallow, thus it will fit in many tight car spaces.

The Rockford P3SD48 design comprises of an M-Roll Santoprene surround and an anodized aluminum cone. The cone is rigid and light and it strengthens the sub. The cone will deliver outstanding detailed and clear sounds, and protect the sub from external elements.

The M-Roll Santoprene surround plays a big role in the way the sounds are produced. This particular surround functions as effective as a rubber surround, but it has a lasting durability. It will hit the lowest key perfectly without any hitches. It isn’t shallow and dull, but profound with a nice bass.

The woofer has a notable sensitivity level of 82 dB, meaning that it is quite capable of reproducing 82 dB from a single watt of input. The high-quality materials of the sub and the ample wattage contribute to the quality reproduction of low-frequency sounds.

2. JL Audio 8W1V3-4 8-Inch Subwoofer Review

Product Highlights

  • 8-inch design
  • Top mount subwoofer
  • 3-7/8-inch top mount depth
  • 8 dB sensitivity
  • 4-ohm nominal impedance
  • 25 Hz – 250 Hz frequency response range
  • 300 watts peak, 50-150 watts continuous power handling
  • Nitrile-butylene rubber surround
  • Mica-filled polypropylene cone
  • 5 Cu. Ft. Ported enclosure
  • 35 Cu. Ft. Sealed enclosure

The JL Audio 8W1V3-4 is a good choice when you have limited mounting space in your car. With a top mount depth of 3-7/8 inches, the subwoofer will fit effectively in a sealed enclosure of 0.35 cubic feet and a ported enclosure of 0.5 cubic feet. This is very convenient for most people.

It features a mica-filled polypropylene cone, which is greatly damped and able to dissipate more energy. Therefore, the cone has an exceptional controlled breakup that produces a slicker high-frequency roll-off. This cone will do wonders for you as far as bass production is concerned.

The Nitrile-butylene rubber surround is also very operational. Regardless of the various durability issues associated with rubber surrounds, the surround on the JL Audio 8W1V3-4 is very flexible and offers greater excursion compared to most surround materials.

Apart from the fact that the JL Audio 8W1V3-4 is optimized to fit in tight space, it is also compatible with amps that have a power range of 50 watts to 150 watts. This is continuous power handling is incredible, meaning that the woofer will deliver more than you had expected.

3. GRS 8PR-8 8-Inch Poly Cone Rubber Surround Woofer Review

Product Highlights

  • 8-inch design
  • Mounting depth of 3.44 inches
  • 90 watts max, 65 watts RMS power handling
  • Nominal impedance 8 ohms
  • 85 dB sensitivity
  • 40 Hz – 5,000 Hz frequency response range
  • Ferrite magnet, rubber surround, and poly cone
  • 81 cubic feet sealed volume box
  • 54 cubic feet vented volume box
  • 5-inch voice coil diameter

The GRS 8PR-8 is another outstanding subwoofer that is designed to fit into tight spaces. You do not have to constantly scan the market for a high-performing shallow mount woofer because this particular model has an impressive thin-line mounting depth of 3.44 inches.

Its design comprises a rubber surround and a polypropylene cone. One of the benefits of a poly cone is high uniformity, meaning that it is damped and very much capable of dissipating more energy. When combined together with the rubber surround, the outcome is high excursion and linearity.

The stamped steel frame does excellently enclose speaker components and ensure that they are in perfect alignment. The motor is greatly optimized, featuring a vented pole piece and a ceramic ferrite magnet, which is an ideal combination.

The ceramic ferrite magnet produces a remarkable amount of energy and the vented pole piece does a good job of minimizing air pressure. This leads to the cooling of the voice coil, which is necessary for the subwoofer to continue functioning properly.

The 3.44-inch mounting depth is compatible with a 5.54 cubic feet vented enclosure and 0.81 cubic feet sealed enclosure. The vented enclosure delivers a frequency of 29 Hz, while the sealed enclosure delivers a frequency of 54 Hz. Therefore, you have a choice to make depending on the sound quality you want.

4. Polk Audio db840DVC 8-Inch Subwoofer Review

Product Highlights

  • 8-inch design
  • 4-inch top mounting depth
  • 4-ohm voice coil
  • Santoprene rubber surround
  • Polypropylene cone material
  • 85 dB sensitivity level
  • 30 Hz – 200 Hz frequency response
  • 360 watts peak, 50-180 watts RMS power handling
  • 6 cubic feet ported enclosure
  • 35 cubic feet sealed enclosure
  • Marine certified

The Polk Audio db840DVC is a highly versatile 8-inch subwoofer that is marine-certified. This means that you can use it in your convertible or boat. With a top mounting depth of 4 inches, this particular sound driver will fit most cars with limited space.

It features a Santoprene surround (a combination of thermoplastic meld and rubber) that is resistant to humidity and temperature. This does not only increase the durability of the driver, but also boosts the excursion. The flexibility of the woofer is also improved.

The Polk Audio db840DVC has a polypropylene cone that is reinforced by a vented cone coupler. The polypropylene material has greater uniformity and damping, which produces reliable high-frequency roll-off. The coupler does a good job of lowering distortion and improving mechanical stability.

The sub’s linear motion and thermal stability are greatly improved by the fire-retardant damper. In addition, the woofer has an optimized arrangement of the suspension, motor, and voice coil alignment. This leads to effective cone linearity, which delivers lower distortion and flatter response.

5. Kicker 40CWD84 8-Inch CompD Car Subwoofer Review

Product Highlights

  • 8-inch design
  • Dual voice coil sub
  • 3-7/8-inch mounting depth
  • 6 dB sensitivity
  • 4 ohms impedance per voice coil
  • 400 watts max, 200 watts continuous power handling
  • 30 Hz – 500 Hz frequency response range
  • Ribbed poly-foam surround
  • Injection molded polypropylene cone
  • Large diameter damper

The Kicker 40CWD84 is a high-quality, high-performing subwoofer that is compatible with most limited car spaces. It offers you amazing bass sound at an unbelievably affordable price. So, you don’t have to put up with those poor-performing factory bass sound drivers anymore.

The design comprises of ribbed polyurethane surround, which is flexible, tear-resistant, and has a wide resiliency range. It is the ideal material for the maximum excursion because it has good elongation as well as recovery qualities. The bursts will not tear the surround because the material has high tensile makings.

The injection molded polypropylene woofer composition has high uniformity and damping. This ensures that there are less distortions and more quality bass sound. The combination of the ribbed polyurethane surround and polypropylene cone protects the sub’s design from temperature and humidity.

Apart from the amazing Kicker design, the woofer has a reliable continuous power handling of 200 watts. This kind of nominal power will keep you glued in your car listening to the entertaining bass sounds. Also, you can easily link the woofer to a mono amp, thanks to the 4-ohm dual voice coil.

Final Words

The market will never disappoint you because you will come across numerous 8-inch subs. Some will be expensive and other affordable, but what determines the output you get, are the design and performance qualities.

Make sure the power handling, sensitivity, and frequency response range are the best. The best 8 inch subwoofer reviews provide you, with reliable buying information, tips to share with another buyer, and reference for future purchases.