LF21X451

LF21X451

LF21X451 - Image 2

Category RCF

LF21X451

WOOFER

SPECIFICATIONS

General specifications

Nominal Diameter:

21 inch / 533 mm

Rated Impedance:

8 ohm

Program Power:

4000 W

Power handling capacity:

2000 W

Sensitivity:

97.0 dB

Frequency range:

28 – 1000 Hz

Effective piston diameter:

470 mm / 18.5 inch

Max. Excursion Before Damage:

54 mm / 2.13 inch

Minimim Impedance:

6.7 ohm

Voice Coil Diameter:

4.5 inch / 114 mm

Voice Coil Winding Material:

Copper

Voice Coil Length:

34 mm / 1.34 inch

Number of layers:

2

Kind of layers:

inside/outside

Top Plate Thickness:

15 mm / 0.59 inch

Cone Design:

Curved

Surround Material:

Polycotton

Surround Design:

Triple roll

Magnets:

Ceramic

Dual-force air ventilation:

Yes

Spider:

Dual with silicon based damping control

Thiele – small parameters

Resonance frequency (Fs):

28 Hz

DC resistance (Re):

5.40 ohm

Mechanical factor:

6.90 Qms

Electrical factor (Qes):

0.39 Qes

Total factor:

0.37 Qts

BL factor (BL):

30.50 T x m

Effective moving mass (Mms):

355.0 g

Equivalent Cas air loaded (Vas):

385.0 liters

Effettive piston area (Sd):

0.170 m2

Max. linear excursion (Xmax):

14.0 mm

Voice coil inductance @ 1kHz (Le1k):

2.90 mH

Half-space efficency (Eff):

2.20%

Mounting Information

Overall diameter:

547 mm / 21.54 inches

Bolt circle diameter:

527 mm / 20.75 inch

Bolt hole diameter:

7 mm / 0.28 inch

Front mount baffle cut-out:

512 mm / 20.16 inch

Rear mount baffle cut-out:

512 mm / 20.16 inch

Volume occupied by the driver:

6.5 liters / 0.26 ft3

Standard compliance

CE marking:

Yes

Size

Weight:

15.5 kg / 34.17 lbs

Height:

245 mm / 9.65 inches

Diameter:

547 mm / 21.54 inches

Shipping informations

Package Width:

584 mm / 22.99 inches

Package Weight:

18.5 kg / 40.79 lbs

Package Height:

284 mm / 11.18 inches

Package Depth:

604 mm / 23.78 inches