Pioneer TS-B351PRO 3.5" Bullet Tweeters

The Pioneer TS-B351PRO is a pair of 3.5-inch bullet tweeters designed to add focused high-frequency output to a car-audio system. It is built for listeners assembling high-sensitivity systems where clear upper-frequency reproduction is needed alongside mid-bass drivers and subwoofers. With a 3,000 Hz to 22,000 Hz frequency response, it is intended to handle the upper range rather than full-range or bass duties.

Part of Pioneer’s P.R.O. Series, the TS-B351PRO is suited to open-show and high-SPL-oriented installations. Its 100 dB sensitivity rating helps it produce substantial output from available amplifier power. The 4-ohm nominal impedance makes it suitable for use with compatible car-audio amplification and crossover arrangements.

The tweeter uses a titanium diaphragm in a horn-style bullet design. This combination is designed for direct, efficient high-frequency projection in systems that need to remain audible at elevated listening levels. Pioneer rates the pair at 150 watts nominal power handling and 300 watts maximum power handling.

An aluminum die-cast chassis supports the tweeter assembly, while a ferrite magnet provides the motor structure. The field-serviceable tweeter unit can be repaired using Pioneer’s compatible replacement diaphragm repair kit. This makes the TS-B351PRO a practical choice for systems where serviceability is important.

These tweeters work best as part of a properly filtered multi-speaker setup, not as standalone speakers. Pioneer specifies a 3,000 Hz crossover frequency and instructs installers to use the specified network. Pair them with appropriately crossed-over mid-bass speakers, a compatible amplifier, and secure mounting hardware for a balanced system upgrade.

Key Features

• 3.5-Inch Bullet Tweeters: Focused high-frequency drivers for multi-speaker car-audio systems.
• Titanium Diaphragms: Provide a durable diaphragm material for upper-frequency reproduction.
• 150W Nominal Handling: Supports amplified systems with appropriate crossover protection.
• 100 dB Sensitivity: Helps deliver strong output with available amplifier power.
• 4-Ohm Impedance: Matches many compatible car-audio amplifier channels.
• Field-Serviceable Design: Allows replacement of the tweeter diaphragm assembly.

Design & Installation

The TS-B351PRO combines a titanium tweeter diaphragm with an aluminum die-cast chassis and ferrite magnet. Its bullet-style, horn-oriented layout is made for efficient high-frequency output, and the chassis is designed to provide a rigid mounting structure. No speaker grilles are included.

Confirm fitment before installation: each tweeter requires a 3-inch cutout and 1-3/4-inch mounting depth, with a 4-inch outer diameter. Mounting screws are included, but the system must use the specified crossover network; Pioneer cautions against operating the speaker independently. Secure the capacitor body and lead wire after wiring, and keep capacitor leads away from metal parts.