P.Audio

SD SERIES  -  21" WOOFER  -  SD-21

THIS 21" WOOFER HAS A STRONG BASS SOUND W/ A 6" VOICE COIL!

No Longer Available

Replaced by the SD21-2000N

WOOFER MODEL

SD-21

SPECIFICATIONS

Nominal Basket Diameter

21" / 530mm

Impedance

8 ohms

RMS Power Rating

1,000 Watts

Program Power  2,000 Watts  

Frequency Response

30Hz - 1.5kHz

Sensitivity (1W/1m)

96.9dB

Voice Coil Diameter

6" / 152.4mm

Voice Coil Material ALR
Terminal Type Gold Plated Push
Spider Material Treated Cotton
Former Material Glass Fiber
Dust Cap Paper
Basket Cast Aluminum
Basket Color Blue
Cone Material Paper Pulp
Surround Material Treated Cloth
Magnet Material Ferrite
Magnet Weight 152.3 oz.
Net Weight   34.4 kg. / 75.68 lbs.
Shipping Weight 40 kg. / 88 lbs.

MOUNTING INFORMATION

Overall Diameter 21.46" / 545mm
Baffle Cutout Diameter 19.25" / 488.2mm
Bolt Circle Diameter 20.47" / 520mm
Overall Depth 9.74" / 247.5mm
Flange Thickness 0.95" / 24mm
No. Of Mounting Holes 8

THIELE-SMALL PARAMETERS

Resonant Frequency (fs) 41 Hz
Impedance (Re) 5.3 ohms
Coil Inductance (Le) 1.4mH
Mechanical Q (Qms) 9.886
Electromagnetic Q (Qes) .434
Total Q (Qts) .416
Compliance Equivalent Vol. (Vas) 200.61 Liters/7.08cu. ft.
Voice Coil Overhang (Xmax) 5.9mm
Xmax (Peak to Peak) 31.7mm
BL Factor (BL) 31.72
Surface Area of Cone (Sd) .173m2
Reference Efficiency 3.08%

Low Frequency Response

Mounting Dimensions

 

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