LMS-Ultra 5400
LMS-UltraLMS-UltraLMS-UltraLMS-Ultra Driver

LMS-Ultra 5400 18″ Driver

The pinnacle of TC Sounds precision and power, our exclusive variable volume coil in the LMS Ultra 5400 makes for a woofer like no other.

This massive 75lb. flagship 18” transducer is the most linear, lowest distortion, highest displacement, low frequency driver we have ever made.

That might sound like big talk, but we’re confident nothing outperforms this driver with better depth and clarity. The Ultra is used in some of the best recording studios and high-end audio systems because its the choice for no-compromise linear reinforcement. While the driver is expensive, we’re confident the 5400 will meet the most demanding low frequency and high output expectations.

Hand built under our care, nothing is spared, only the best materials available are used on the Ultra line.

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Video: LMS-Ultra Subwoofer Line

Highlights

  • High-temperature low eddy-current stainless steel voice coil former
  • LMS motor technology, 2+2 ohm 4″ diameter dual voice coil
  • 11″ linear spider suspension with large integral lead-wires
  • 525 oz. magnet motor structure with large anti-flux-modulation shorting ring
  • Tall profile XBR surround for 3″ peak-to-peak travel
  • Large anti-flux-modulation shorting ring
  • Single dish aircraft-grade aluminum alloy cone
  • Dims: Diam: 18.52″ • Cutout: 16.83″ • Depth: 11.54″ • Weight: 86.2 lbs.

What people are saying

Outstanding subwoofer

“In a market filled with “louder is better”, this subwoofer demonstrates that finesse and quality exists, even in the high-power 18″ market. I have been designing and installing high-powered SQ systems for 20+ years, and I can honestly say these are the finest 18″ drivers I have ever used.”

Ganko Jiji – NV, USA

The LMS Ultra 5400 stands alone

“The LMS Ultra 5400 18″ driver is state of the art… Nothing can touch this driver if you are willing to provide it with the power that is requires.”

Christian – PA, USA

Specifications

Standard Small parameters, power and motor specifications listed below. These parameters are only a guildline to system design and expected response. Some of the parameters such as the Qts will shift with heat or excursion by more than 20%. There is no reason to model or expect exact constant parameters because of these natural non-linear shifts.

Thiele/Small Parameters

Parameter 18″ LMS-Ultra 5400 Description
Qts 0.325 Total Q
Qes 0.34 Electrical Q
Qms 7.6 Mechanical Q
Fs 20.5 Hertz, Free Air Resonance
Res 3.78 Ohms, DC resistance
Ls 2.8 H, series inductance
Le 1.96 mH, Nominal Inductance with voice coils in series
Le Parallel X mH, Nominal Inductance with voice coils in parallel
Lp 3.4 H, lossy series inductance
Rp 3.3 Ohms, loss across Lp
Dia 390 m meters, effective
Vas 240.7 liters, air volume equivalent
mms 501.3 grams, effective mass
cms 120.1 um/N, compliance
bl 26.8 T*m, motor strength
SplSens 89.7 dBSPL max @1W absorbed
Measured with Praxis (voice coil wired in parallel)

Power and Displacement

Parameter 18″ LMS-Ultra 5400 Description
Xmax 33.655 Millimeters, (voice coil – gap) / 2 (one way)
70% BL 38 Millimeters, BL is 0.7 original value (one way)
Xmech 44mm Mechanical displacement limit (one way)
Long Term Power X Watts, 2 hour RMS limit
Program Power X Peak power limit & recommended RMS

Motor & Coil

Parameter 18″ LMS-Ultra 5400 Description
Nominal Impedance 4 Ohms, Approximate nominal load
Gap height 0.6 inches, millimeters
Coil height 3.25 inches, millimeters
Coil Layers 4-2 Variable aluminum
Coil size 4 Inches, former inside dimension
Maximum gap flux tesla
Force factor 190 Newtons2/watt

Enclosures

Small Sealed

Size Volume Type
18″ 2.1 ft3 Butterworth

Large Sealed

Size Volume Type
18″ 4.0 ft3 Bessel

Small Ported

Size Volume Port Length Port Area Tuning
18″ 3.1 ft3 36.5 in 4 × 4 in 30 Hz

Medium Ported

Size Volume Port Length Port Area Tuning
18″ 5.4 ft3 46 in 6 × 4 in 25 Hz

Large Ported

Size Volume Port Length Port Area Tuning
18″ 6.4 ft3 62 in 6 × 4 in 20 Hz

Very Large Ported

Size Volume Port Length Port Area Tuning
18″ 8.0 ft3 90 in 6 × 4 in 15 Hz

Single VMP

Size Volume Number of VMP’s Moving Mass Tuning
18″ 5.4 ft3 1 × 18 in 750 g 20 Hz

Dual VMP

Size Volume Number of VMP’s Moving Mass Tuning
12″ 6.4 ft3 2 × 18 in 1550 g 18 Hz

Very Large Dual VMP

Size Volume Number of VMP’s Moving Mass Tuning
12″ 8.4 ft3 2 × 18 in 1650 g 15 Hz