A budget subwoofer does not have to mean cheap bass. The difference between a $70 sub that sounds good and one that sounds bad comes down to a handful of specifications and construction details that most buyers overlook. If you know what to look for, you can get real, musical bass from a subwoofer without spending $300.
This guide covers what actually matters in a budget subwoofer, what to ignore, and which MTX subwoofers and packages deliver the most performance per dollar.
What to Look For
This is the only power number that matters. RMS is the continuous power a speaker can handle safely. Ignore peak, max, and any other number — they are marketing figures, not performance specs. A 200W RMS subwoofer is meaningfully more capable than a 150W RMS unit at the same price.
Polypropylene cones are the standard for budget subs and are a good sign. They are stiff, lightweight, and moisture resistant. Paper cones are cheaper to manufacture and more common in no-name products. They soften with heat and humidity and degrade faster over time.
A larger voice coil handles more power and dissipates heat better. Single-layer voice coils are less expensive but have lower power handling. Dual voice coil subwoofers give you wiring flexibility to match different amplifier impedances — useful when you're working with budget amplifiers.
Every subwoofer has specific recommended enclosure volumes and types. A sub designed for a sealed box will not perform well in a ported box of the wrong size. Check the product specs or manual for recommended enclosure volume before building or buying a box.
4 ohm is the safest and most universal choice for budget builds. It works with any amplifier without special wiring. 2 ohm draws more power from the same amp but requires confirming the amp is stable at 2 ohms. Dual voice coil subs give you both options.
Budget subwoofers from reputable brands are rated conservatively and tested to real standards. No-name imports frequently claim inflated wattage using peak figures measured under conditions that do not reflect real use. A 200W RMS rating from a known brand means more than a 1,000W claim from an unknown one.
Avoid subwoofers that only list peak or max power without an RMS figure. This is almost always a sign the RMS rating is embarrassingly low. Also avoid paper cone woofers, any product claiming over 1,000W from a $50 sub, and enclosure packages that include a head unit, amplifier, and two 12" subwoofers for under $150. If the deal sounds too good, the components are not what the spec sheet claims.
10 vs 12 Inch: Which Should You Buy?
A 12 inch subwoofer moves more air than a 10 inch and produces more output at the same power. It requires a larger enclosure, typically 1.0–1.5 cubic feet sealed for a budget sub. A 10 inch is easier to fit in smaller vehicles, requires less enclosure volume, and is faster and tighter-sounding. For most people, a single 12 inch in a sealed box is the best entry-level choice. If space is the primary constraint, a 10 inch is the right call.
MTX Terminator Series — Best Entry-Level Budget Sub
The MTX Terminator Series is the starting point for anyone getting into car audio on a budget. These are real subwoofers with polypropylene cones, stamped steel baskets, and conservatively rated RMS power. They are not the loudest sub in the world, but they are honest about what they can do, which is more than you can say for most products at this price.
MTX 35 Series — Best Step-Up Budget Sub
The MTX 35 Series is the step up from the Terminator: more power handling, better low-frequency extension, and an apex surround that improves excursion at high output. If you are pairing with a mid-range amplifier and want noticeably more output than a Terminator can provide, the 35 Series is where the money goes. Most models come in under $150, with the shallow-mount 12 inch as the exception at $169.95.
Subwoofer Enclosures & Powered Packages
If you want to simplify your build, MTX Terminator enclosures and powered packages take care of most of the work. Enclosure-only options pair with the woofers above and come pre-built and tuned for the included drivers. Amplified packages add a matched mono amplifier so you have everything except the wiring kit. The TN8MS is a self-contained powered 8 inch enclosure designed to fit under most vehicle seats. Two 12 inch subwoofers with an amplifier for under $370 is genuinely hard to beat.
