BRS46 vs MR52B: Which BOSS Audio 6.5-Inch Speaker Fits Your Ride?

Quick answer

Choose the BOSS Audio BRS46 if you need a shallow-mount 6.5-inch speaker with a simple dual-cone design and want to spend the least. Choose the MR52B if you want a separate dome tweeter for clearer highs and a slightly more robust build. The MR52B costs more, but the 2-way system is the better all-around replacement for most car doors.

Replacing 6.5-inch speakers is one of the most common audio upgrades, and the choice often comes down to two BOSS Audio models: the BRS46 and the MR52B. Both fit the same size hole, but they are built differently and priced differently. Knowing those differences before you buy saves you from ordering a speaker that won't fit or won't deliver the sound you expect.

This comparison uses only the catalog facts BOSS Audio supplies for each model. We'll walk through the cone material, surround, basket type, tweeter design, and mounting depth, then explain which rider or driver each speaker suits best. If you are shopping for a straightforward replacement or a small step up in clarity, this will help you decide.

What the BRS46 and MR52B have in common

Both the BRS46 and the MR52B are 6.5-inch speakers from BOSS Audio, and both use a polypropylene cone. Polypropylene is a common speaker cone material because it resists moisture and holds up well in a car door or a boat without much fuss. Neither model is sold as a component set, so each one is a self-contained speaker with its own mounting frame.

Because they share the same nominal size, they generally drop into the same 6.5-inch openings. That means your decision is not about whether one will physically fit the cutout, but about the depth behind the cutout and the tweeter design. Those two factors drive most of the real-world difference between these speakers.

• Both are 6.5-inch speakers with a polypropylene cone.
• Both are full-range speakers, not separate component sets.
• Check your door or enclosure depth before ordering either model.

Where the BRS46 keeps things simple

The BRS46 uses a dual-cone design with a foam surround and a stamped steel basket. A dual-cone speaker produces high frequencies from the same cone structure rather than a separate tweeter, which keeps the design simple and the cost down. The foam surround is a traditional choice that works well in moderate climates and in vehicles that are not exposed to constant sun and salt.

The standout spec is the mounting depth: 1.75 inches (44 mm). That is shallow enough for many tight door locations and some dash or rear-deck spots where a deeper speaker will not clear the window track or structural metal. If you have ever pulled a door panel and found almost no space behind the factory speaker, the BRS46 is the safer bet.

• Dual-cone design means no separate tweeter to aim or mount.
• Foam surround is fine for normal car interiors but less ideal for harsh marine exposure.
• 1.75-inch mounting depth helps in shallow locations.

Where the MR52B steps up

The MR52B is a 2-way system with a 0.51-inch (13 mm) dome tweeter, a polypropylene cone, a resin-treated cloth surround, and a composite basket. The separate dome tweeter handles the high frequencies, which usually translates to clearer vocals and cymbals than a dual-cone design can produce. The resin-treated cloth surround is also a more durable surround material than foam, especially where heat and moisture are a factor.

The composite basket is another upgrade over stamped steel. It resists flex better under power, which helps the speaker stay controlled when you turn the volume up. The MR52B does not list a mounting depth in the supplied specs, so you should measure your opening before buying. In most standard 6.5-inch door locations it fits, but tight spaces are where the BRS46 has the advantage.

• Separate 0.51-inch dome tweeter for clearer highs.
• Resin-treated cloth surround and composite basket for durability.
• Mounting depth is not listed, so measure your door before ordering.

Price and value

The BRS46 carries a catalog price of USD 19.50, with a catalog comparison price of USD 38.99. The MR52B carries a catalog price of USD 29.24, with a catalog comparison price of USD 58.49. In plain terms, the MR52B costs roughly ten dollars more per speaker at the current catalog prices. That gap buys you the separate tweeter, the cloth surround, and the composite basket.

If you are replacing four speakers, that difference adds up. If you only need a basic working speaker and your budget is tight, the BRS46 gets the job done. If you care about sound quality and plan to keep the vehicle for a while, the MR52B is the better long-term pick. Neither price includes installation, and neither model is sold as a complete package system.

• BRS46: USD 19.50 catalog price, USD 38.99 comparison price.
• MR52B: USD 29.24 catalog price, USD 58.49 comparison price.
• The MR52B costs more but adds a tweeter and upgraded materials.

Trade-offs to weigh before you buy

• Mounting depth vs. tweeter clarity: The BRS46 has a listed 1.75-inch mounting depth, which fits shallow spaces. The MR52B does not list a depth but adds a dedicated dome tweeter for clearer highs. Measure your door depth first. If space is tight, the BRS46 is the safer choice.
• Surround material and climate: The BRS46 uses a foam surround, while the MR52B uses a resin-treated cloth surround. Cloth generally handles heat and moisture better over time. For a daily driver in a hot or humid climate, the MR52B surround is the more durable option.
• Upfront cost vs. long-term satisfaction: The BRS46 is the lower-cost option at USD 19.50 catalog price. The MR52B is USD 29.24 catalog price but includes a composite basket and separate tweeter. If you plan to keep the vehicle and care about sound, the MR52B is worth the extra cost.

Key product facts

• BRS46: Polypropylene cone, foam surround, dual-cone design, stamped steel basket, mounting depth 1.75 inches (44 mm). The shallow depth and simple dual-cone build make it a practical fit for tight door locations and budget builds.
• MR52B: 2-way system with a 0.51-inch (13 mm) dome tweeter, resin-treated cloth surround, polypropylene cone, and composite basket. The separate tweeter and upgraded surround and basket give clearer highs and better durability than a basic dual-cone speaker.

Which BOSS Audio 6.5-inch speaker should you choose?

Best for

• Drivers with shallow door or dash locations who need a 1.75-inch mounting depth.
• Budget-conscious buyers replacing multiple speakers who want a simple, reliable dual-cone design.

Not for

• Listeners who want clear, separated highs from a dedicated tweeter.
• Owners in hot or humid climates who want a more durable cloth surround and composite basket.

The BRS46 and MR52B both fit standard 6.5-inch openings, but they serve different priorities. Pick the BRS46 for its shallow 1.75-inch depth and lower price. Pick the MR52B for its separate dome tweeter, resin-treated cloth surround, and composite basket. Measure your space, set your budget, and choose the one that matches how you actually listen.