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Linear Drivers

LMS-4100 NEO

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Passive Radiators


Driver Guide

The TC Sounds flagship

Introduction • Specifications • Dimensions • Patents • Thiele-Small's • Enclosures  • Wiring  • Parts
  Frame color: (Metallic red)
Key Features

180 N2/W Linear Motor Force
2500 Watts Continuous Power
4" Titanium Linear Voice Coil
Single Dish Titanium Cone
High Excursion Tall NBR Surround
516 Ounce Magnet Structure
38mm Linear XMax
10" Diameter Suspension System
Custom Cast Aluminum Frame
Quick-Detach Top Assembly


As the new TC Sounds flagship driver, you knew it was not going to be cheap, but given the fact there is quite literally no other single driver that compares to the level of quality and performance this one offers, what else would you expect? Imagine a 3" peak to peak stoke of pure undistorted sound from a motor more capable than any before it. Well unless you have heard this driver, you probably can't. You can spend virtually any amount of money on a single driver alone and not achieve the level of sound quality that the LMS-5400 will produce. To put it simply, this is highest excursion lowest distortion driver we know how to build, and the simple fact it can still outgun just about any other respected SPL driver around is just icing on the cake. The LMS-5400 is our crowning achievement of what we can design at TC Sounds, and we're proud to present this unique and truly special driver to you direct from our factory!

Dual voice coil

18" LMS-5400 $875 Black Ti cone
MSRP: $1295

In stock!

15" LMS-5400 $775
MSRP: $995

Out of stock!

Free shipping to US continental states
IMPORTANT: For shipping outside the USA, see details


The LMS-5400 is the ultimate solution for reference level low distortion high SPL subsonic sound reinforcement. With a world class motor system, ultra high thermal limits and no compromise on quality, this is literally the most advanced, highest performance super driver you can buy. Here is why,

Advanced FEA Motor System

Quadruple stacked 3/4" tall ferrite magnets and long T-yoke
Massive 516oz top grade 10.1" wide magnet super structure
Large anti-flux modulation aluminum shorting ring to lower distortion
Low carbon steel used for the gap plate and t-yoke
Large pole vent for lower distortion and cooling capabilities.

Advanced linear soft part system

Linear voice coil technology linearizs the BL force and lowers motor distortion
Patent pending 4" diameter, bifilar linear-wound aluminum wire voice coil
Non-conductive titanium voice coil former eliminates eddy current distortion
Titanium vc remains stronger than aluminum, Kapton®, or fiberglass for durability
Dual stiff high excursion 10" linear roll poly-cotton spiders
Extra thick intergraded woven leads to prevent lead-slap
Extra spacing in-between spiders for lateral stability
Ultra strong, brushed and powder coated titanium cone (TC Sounds exclusive design)
1" wide long throw tall profile, highly durable NBR surround
High quality thermal flexible epoxies to ensure longevity

Patented custom cast aluminum frame

Extra clearance under the suspension for dynamic high excursions
Wide spider landings for higher than average throw
Patented tool-less detachable method for easy and fast and recones or repairs
Durable high gloss black powder coat and chrome vc mesh guards


Effective linear motor force of a 180 Newtons2 per watt (BL2/Re)
2500 watts continuous power (8000 watts peak)
38mm total linear BL XMax (voice coil, one-way)
44mm XMech (mechanically limited, one-way)


Driver Cutout Diameter Basket Diameter Gasket Height Mounting Depth  Displacement   Weight 
15LMS-5400 14.00" 15.65" 0.65" 12.25" 0.15ft3 72.1lb
18LMS-5400 16.80" 18.65" 0.65" 13.25" 0.16ft3 75.6lb

*mounting depth includes 0.8" spacing for rear poll venting


No. US D455,733 S (Speaker Driver Frame)
No. US D451,7499 S (Speaker Driver Frame)
No. US 7,031,490 B2 (Speaker Driver with Detachable Motor and Basket)
No. (Frame Threaded Adaptor)
Pending (Linear Voice Coil)

Thiele Small Parameters

15" LMS-5400 DVC


18" LMS-5400 DVC

Recommended enclosures

The LMS-5400 subwoofers are engineered for medium sealed, ported or passive box enclosures and designed for high power to ultra high power capabilities. We recommend an amplifier between 1000 and 4000 watts RMS per driver.

There is no single perfect box. Much of what we offer is merely a general guideline to get you started. All of our system recommendations are geared for flat response but it is important to note that we do not show the recommended EQ necessarily for true in room liner frequency response. At a minimum, we strongly encourage the use of a high pass filter to prevent over excursion and potential mechanical damage to the driver in any given system design.

We specify six different system designs for each driver. Three of which give you linear output to around 25-20Hz which is ideal for home audio or large rooms, and the other three give you linear output to 35-30Hz which is ideal for car audio or small rooms. For each linear extension mode, there are three types of enclosures: Sealed, Ported and Passive. As a general rule of thumb, sealed systems can be the smallest design and have the smallest group delay, but are the least efficient and provide the least output. Ported systems are more efficient and provide more output around the system resonant frequency (Fb) but then roll off very steep after and require a larger box. Finally, passive systems have the efficiency characteristics of the ported systems, but use a mass loaded diaphragm rather than an air loaded mass as a Helmholtz resonator. The passive design also eliminates port resonance and turbulence issues associated with ported systems, but they also have the steepest roll off after Fb. There are many other differences and arguments among the system designs, but we leave that up to you do decide and debate. There is plenty of great information about system design on the net and of course, you can just ask in our forums and we’ll gladly assist you in your design. Remember, there is no single perfect box!


Volume: Net internal volume of the enclosure minus the total port volume (if any) and minus the displacement of the subwoofer which can almost usually be estimated as 0.1 cubic feet. We also recommend using 1 pound of fiberglass per cubic foot of volume for a sealed box. For a vented box, it is only generally only necessary to use modest fiberglass on the outside walls.

Tuning Fq: The tuning frequencies specifying the actual tuning frequency of the system. For ported systems, this only depends on the port length, port area and volume of the box. For passive systems this only depends on the compliance, mass and surface area of the radiator(s) and the volume of the box. Increasing the number or size of the passive radiator(s) is like increasing the size of the port(s) and will allow for more output at tuning frequency.

Area Port/Pass: This is either the square area of the port used or the size and quantity of the passive radiators to be used. Multiple smaller ports can be used so long as the total combined port area equals the specified number. For passive systems, we recommend only using TC Sounds' passive radiators because of the necessary excursion. Others just won’t cut it. If an alternative PR is used, the size may not apply because the compliance and excursion parameters may be different.

Quick Conversion:
07.0in2 = One 3" port
12.5in2 = One 4" port
19.6in2 = One 5" port
28.3in2 = One 6" port

Length / Mass: As stated, this is either the length or the mass to be used. The length applies exclusively to ported systems and the mass applies exclusively to passive systems. All passive radiators are weighted. If you are using TC Sounds passives, simply adjust the washers on the back of the driver so that the total moving mass of the radiator equals what is specified. The total moving mass includes the bare mass plus the added mass of the washers.

Small Box

Type Volume Tuning Fq Area Port/Pass Length / Mass
Sealed 2.3 ft3 NA NA NA
Ported 2.2 ft3 32Hz 25.0 in2 22 in
Passive 2.2 ft3 20Hz-35Hz Dual 15" PR Variable

Type Volume Tuning Fq Area Port/Pass Length / Mass
Sealed 3.8 ft3 NA NA NA
Ported 3.5 ft3 30Hz 37.5 in2 23 in
Passive 3.5 ft3 20Hz-35Hz Dual 18" PR Variable

Large Box (Low Extension)

Type Volume Tuning Fq Area Port/Pass Length / Mass
Sealed 4.5 ft3 NA NA NA
Ported 3.6 ft3 20Hz 25 in2 35 in
Passive 3.6 ft3 10Hz-25Hz Dual 15" PR Variable

Type Volume Tuning Fq Area Port/Pass Length / Mass
Sealed 7.5 ft3 NA NA NA
Ported 5.6 ft3 19Hz 37.5 in2 38 in
Passive 5.6 ft3 10Hz-25Hz Dual 18" PR Variable

Replaceable Top Assemblies

Top assemblies are replacements for damaged drivers. All of our new drivers have detachable top assemblies. In the case of damage, they can be easily replaced in a matter of just minutes. All of our assemblies come fully assembled and ready to install onto existing motors. Our assemblies are strictly for our own products and can not be used on any of our OEM products or products other than the specific drivers they are designed to be used for because they physically will not install. If you have an older TC Sounds driver and you would like to have it repaired, please contact us and arrange for shipping. We can repair any of our older drivers if and only if we originally built them, and we will be more than happy to give you a quote. For warranty information pertaining to damaged TC Sounds drivers that may require a new top assembly or otherwise, please read our warranty process for information and procedure.

Quad voice coil

18" LMS-5400 Assembly $398
Out of stock

15" LMS-5400 Assembly $348
Out of stock

IMPORTANT: For shipping outside the USA, see details