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Standard small parameters, power and motor specifications listed below. These parameters are only a guideline to system design and predicted response. Some of the parameters such as the Qts will shift with heat or excursion by more than 20%.

LMS-Ultra 5400

  • Thiele/Small Parameters

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Parameter 18" Ultra Description
Qts 0 Total Q
Qes 0 Electrical Q
Qms 0 Mechanical Q
Fs 0 Hertz, Free Air Resonance
Res 0 Ohms, DC resistance
Ls 0 H, series inductance
Lp 0 H, lossy series inductance
Rp 0 Ohms, loss across Lp
Dia 0 m meters, effective
Vas 0 liters, air volume equivalent
mms 0 grams, effective mass
cms 0 um/N, compliance
bl 0 T*m, motor strength
SplSens 0 dBSPL max @1W absorbed
Measured with Praxis (voice coil wired in parallel)

  • Power and Displacement

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Parameter 18" Ultra Description
Geometric Stroke 0 Millimeters, (voice coil - gap) / 2
70% BL 0 Millimeters, BL is 0.7 original value (one way)
Xmech 0 Mechanical displacement limit (one way)
Long Term Power 0 Watts, 2 hour RMS limit
Program Power 0 Peak power limit & recommended RMS

  • Motor & Coil

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Parameter 18" Ultra Description
Nominal Impedance 0 Ohms, Approximate nominal load
Gap height 0 inches, millimeters
Coil height 0 inches, millimeters
Coil Layers 0 8 Layer flat wound
Coil size 0 Inches, former inside dimension
Maximum gap flux 0 tesla
Force factor 0 Newtons2/watt

Mounting/Installation Dimensions (PDF)

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