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Pioneer TS-B400PRO

4" High Efficiency PRO Series Bullet Car Tweeter

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List price $129.99

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Pioneer Reference for Open Show Series

Inspired by Pioneer’s history of record-breaking SPL competition, the new P.R.O. series line of speakers is constructed with the street enthusiast in mind. With an emphasis on efficiency and power handling, the P.R.O. series lineup consists of bullet tweeters, mid bass drivers, and a subwoofer that can be mixed and matched to deliver impressive output, without requiring an impressive investment. The Pioneer P.R.O. series TS-B400PRO bullet tweeters feature aluminum die-cast chassis with titanium diaphragms backed by aggressive magnets and motor assemblies to produce a wide range of crisp, loud, and clear frequencies with up to 250 watts of maximum power handling.

General Features:

  • 4" PRO Series Car Tweeters
  • Power Handling:
    • Peak: 500 watts
    • RMS: 200 watts
  • Titanium tweeter construction
  • Aluminum die-cast chassis
  • 4 ohms impedance
  • High-temperature voice coil
  • In-line crossover filter
  • Aggresive magnet structure
  • Surface mountable design
  • Sensitivity: 106dB
  • Frequency response: 3,500-27,000 Hz
  • Top-mount depth: 2-5/8"
  • 1-year Sonic Electronix Warranty

Priced Individually
Also Found As: TSB400PRO, TS B400PRO, B400-PRO, TSB400-PRO

Tweeter Specifications

Priced Per
Car Tweeters are typically sold in pairs so you will receive 2 tweeters for each purchase on tweeters marked "Priced Per Pair". If a tweeter is marked "Priced Per Each" then the tweeter is sold individually and each purchase you make will result in 1 tweeter. High-powered tweeters are typically sold per each tweeter.
Tweeter Size
Refers to the size of the tweeter. Typically, smaller tweeters produces less output with higher frequency response.
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Tweeter Composition
Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

Flush Mount
If the speaker or tweeter is flush mountable, then it can be installed flush to the mounting surface.

When installing a flush mount tweeter, make sure that there is enough room behind the mounting surface for the tweeter and magnet. Check the mounting depth with your specific vehicle.

Surface Mount
If the speaker or tweeter is surface mountable, then it can be installed to be raised above the mounting area.

When installing a surface mountable tweeters, make sure that there are no obstructions that will prevent the tweeter from being installed correctly.

Angled Mount
If the speaker or tweeter is able to be angle mounted, then the installed tweeter can be positioned at an angle. An angle mounted tweeter can improve the audible sound quality of your system.

When installing a angle mountable tweeters, make sure that there are no obstructions that will prevent the tweeter from being installed correctly.

Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
500 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
200 watts
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
106 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
3500 - 27000 Hz
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches or millimeters, required to contain the speaker.
3-3/4" x 3-3/4" 
Hi-Res Audio Compatible
This feature refers to if the product is capable of Hi-Res Audio (HRA) playback.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


United Kingdom

Pioneer Crisp Bullet Tweeter,

March 7, 2014

The Bullet Tweeter is nice & crisp, use to have an old RCL bullet a few years back, but they stopped making that model.
Been trying to fine a replacement but a lot of these tweeters are not very crisp or high to how I would like them.
I took a chance with these with one of the reveiws I had read about these tweeters so will now get to the point.
These bullets are brilliant high & very crisp, I am old school & like my Sub Bass & high treble, I listen to Reggea, Dub, Dance music, House & Garage, Deep House so the way music sound is very important to me.
The bullets are rated at 500W peak, 200W rms, 3.5KHZ to 27KHZ & 106 db/w/m making them high frequency & very sensitive this is true.
You can here them from a distance & they chip (old school) & are very crisp.
Highly recomend them to anyone who wants proper high clean crisp old school type treble, I am also considering buying another two before they phase these out.
I am from the UK so had to buy these from America as I couldn't find any one in the UK or even Europe to purchase these item from so am happy that Sonic Electronix helped me out.
Highly recomended.

18 of 21 found this helpful

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Freer, TX


March 16, 2015

I purchesed these after going to a sound comp and hearing some pro audio. Although the ones i heard werent pioneers pioneer seemed to have some really good specs so i bought these as well as the pioneer ts-m800 pros to match and i got 2 8s and 2 4 inch tweeters per front door in a 03 excursion and the sound is impressive on a lanzar 250x4 all purchesed from sonic good prices fast shipping and good service. If your looking for impressive clear and extreamly loud this is the line for you my mids and highs can be heard crystal clear from reportedly a 1/2 mile away inside a well built home. Down fall is the capacitor I ended up having to unsolder it and move it and was a pain to mount also had to solder leads on to the negative by the time you put a crimp style connector on a wire mounting will become imposible due to the angle and the huge magnet. Sorry for spelling errors lol.

12 of 15 found this helpful

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Sacramento, ca

Great product

January 13, 2017

I bought this for a gift for my husband, he loves them. They sound great!

0 of 0 found this helpful

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Accessory Tools and Products

Accessories added


25 ft. of True Spec 16 Gauge EnvyFlex Speaker Wire

Your Price $17.99

Belva BBSW167

16 Gauge 7 Meter (23 Ft) Speaker Wire

Your Price $12.99

Dynamat Xtreme Wedge Pak

Just enough Dynamat to install around tweeters and speakers.

Your Price $29.99

Universal Window Handle Remover

Remove your manual windows and door panels with this simple and convenient tool.

Your Price $9.99

Door Panel & Upholstery Remover Tool

Easily remove your door panels and other panels to make the installation of your new tweeters easy.

Your Price $6.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $14.99

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Browse 2 questions and 7 answers
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Why did you choose this?
Sonic Electronix Store
Replacement for my old ones had a 5 star rating
corey p on Apr 11, 2017
looks good sounds loud and clear completes my car audio sound system
Paul J on Jan 20, 2015
Just Bought and installed two Pioneer TS-W261D4 10" Subwoofers and they are AWESOME!!! So, the existing Tweeters I have need to "Tweet Up"!!! These Fit The Need To A "T"!!! ;-)

I have ALWAYS had Great Pioneer Experiences in the 52 years I have been buying electronics - and the recent Sub-Woofer's and these Tweeters will just Add To "The Pioneer Legacy"!!!
Kevin C on Dec 15, 2016
The best
jesus r on Jan 16, 2015
I'm wont to setup 4-way audio system as a pioneer pro series!
i needs to help for select speaker !
already have 2x TS-1200PRO and 1x TS-6900PRO

please help me to buy High-range, Mid-range and woofer ?
masoud s on May 23, 2015
Pioneer TS-B400PRO
Pioneer TS-B400PRO
Pioneer TS-M650PRO
Pioneer TS-M650PRO
Pioneer TS-B350PRO
Pioneer TS-B350PRO
Pioneer TS-W1200PRO
Pioneer TS-W1200PRO
Pioneer TS-M800PRO
Pioneer TS-M800PRO
Best Answer: I installed the pioneers in the rear and bought a different brand for the front doors and they aren't near as close to the pioneer I hade to give more power to the front cause the pioneers sounded more louder
Reply · Report · Frank J on May 23, 2015
· Add Answer · I Have This Question Too (1)

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Pioneer TS-B400PRO

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Pioneer TS-B400PRO

4" High Efficiency PRO Series Bullet Car Tweeter


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25 ft. of True Spec 16 Gauge EnvyFlex Speaker Wire


Dynamat Xtreme Wedge Pak

Just enough Dynamat to install around tweeters and speakers.


Universal Window Handle Remover

Remove your manual windows and door panels with this simple and convenient tool.



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