LMSR 15inch
LMSR 12inchLMSR 15inch

LMS-R Driver

$0

The LMS-R subwoofers bring our variable volume linear motor system (LMS) to a 3″ diameter voice coil driver.  Capable of over 2″ of peak-to-peak excursion with virtually perfect force linearity, these drivers are in a low-frequency sound quality class of their own.

Given the motor technology also found on our top-line 18″ Ultra 5400 woofer, the clarity and power of the more affordable LMS-R family provides the best price/performance ratio of any mid-sized driver we know.

Equally suitable for sealed or vented enclosures and used in some of the most premium theaters and sound studios around the world.

Buy on Parts Express
Buy on Parts Express
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Video: LMS-R Drivers

Highlights

  • High-temperature low eddy-current stainless steel voice coil former
  • 2+2 ohm dual voice coil with LMS motor technology
  • 10″ linear spider suspension with large integral lead-wires
  • 195 oz. magnet motor structure
  • Tall profile XBR surround for 3″ peak-to-peak travel
  • Field-replaceable top assembly system
  • Large anti-flux-modulation shorting ring
  • LMS-R 12 Dims: Diam. 12.6″ • Cutout: 11.2″ • Depth: 7.2″ • Wt. 38.2 lbs.
  • LMS-R 15 Dims: Diam. 15.6″ • Cutout: 14.0″ • Depth: 8.6″ • Wt. 43.4 lbs.

What people are saying

Has to be the best for the money

“This sub is truly a steal! There are many other subwoofers with a power handling of 1000 watts RMS but most cost more, or are just as close as this in price, but bar none they cannot compare to this low end monster.”

Parts Express Customer – 31012

I am very satisfied with this driver!

“Excellent transient response and detail. Low end extension is unparalleled…. After having used the best drivers from Adire and others with XBL2 for years, I can say with confidence that this driver pushes the envelope even further.”

Prion – 31213 – NC, 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 12″ LMS-R 15″ LMS-R Description
Qts 0.43 0.45 Total Q
Qes 0.46 0.49 Electrical Q
Qms 6.7 5 Mechanical Q
Fs 28 23.6 Hertz, Free Air Resonance
Res 3.96 3.94 Ohms, DC resistance
Ls 4.7 4.5 H, series inductance
Le 3.29 3.15 mH, Nominal Inductance with voice coils in series
Le Parallel X Y mH, Nominal Inductance with voice coils in parallel
Lp 7.7 8.2 H, lossy series inductance
Rp 5.06 4.94 Ohms, loss across Lp
Dia 250 330 m meters, effective
Vas 39 122.6 liters, air volume equivalent
mms 279.7 382.5 grams, effective mass
cms 115.2 119.3 um/N, compliance
bl 20.5 21.24 T*m, motor strength
SplSens 84.5 86.9 dBSPL max @1W absorbed
Measured with Praxis (voice coil wired in parallel)

Power and Displacement

Parameter 12″ LMS-R 15″ LMS-R Description
Xmax 25.4 25.4 Millimeters, (voice coil – gap) / 2 (one way)
70% BL 31.75 31.75 Millimeters, BL is 0.7 original value (one way)
Xmech X Y Mechanical displacement limit (one way)
Long Term Power X Y Watts, 2 hour RMS limit
Program Power X Y Peak power limit & recommended RMS

Motor & Coil

Parameter 12″ LMS-R 15″ LMS-R Description
Nominal Impedance 4 4 Ohms, Approximate nominal load
Gap height 0.5 0.5 inches, millimeters
Coil height 2.4 2.4 inches, millimeters
Coil Layers 4-6 variable 4.6 variable aluminum
Coil size 3 3 Inches, former inside dimension
Maximum gap flux tesla
Force factor 120 120 Newtons2/watt

Enclosures

Small Sealed

Size Volume Type
12″ 0.7 ft3 Butterworth
15″ 2.5 ft3 Butterworth

Large Sealed

Size Volume Type
12″ 1.4 ft3 Bessel
15″ 5.1 ft3 Bessel

Small Ported

Size Volume Port Length Port Area Tuning
12″ 2.5 ft3 31 in 2 × 4 in 30 Hz
15″ 3.5 ft3 23 in 3 × 4 in 30 Hz
15″ (Option B) 3.5 ft3 14.5″ 2 × 4 in 30 Hz

Large Ported

Size Volume Port Length Port Area Tuning
12″ 1.8 ft3 74 in 2 × 4 in 20 Hz
15″ 5.1 ft3 37.5 in 3 × 4 in 20 Hz
15″ (Option B) 5.1 ft3 24.5″ 2 × 4 in 20 Hz

Single VMP

Size Volume Number of VMP’s Moving Mass Tuning
12″ 1.3 ft3 1 × 12 in 630 g 20 Hz
15″ 3.5 ft3 1 × 15 in 630 g 20 Hz

Dual VMP

Size Volume Number of VMP’s Moving Mass Tuning
12″ 1.8 ft3 2 × 12 in 850 g 20 Hz
15″ 5.1 ft3 2 × 15 in 850 g 20 Hz