Description: A 4 ohm version of the popular Sigma Pro 18, recommended for professional audio as a woofer in vented enclosures. SpecificationNominal Basket Diameter18", 457 mmNominal Impedance*4 ΩPower Rating**Watts700 WMusic Program1400 WResonance32 HzUsable Frequency Range32 Hz - 2 kHzSensitivity***97.6 dBMagnet Weight120 oz.Gap Height0.375", 9.5 mmVoice Coil Diameter3", 76 mmThiele & Small ParametersResonant Frequency (fs)32 HzDC Resistance (Re)3.35 ΩCoil Inductance (Le)0.85m HMechanical Q (Qms)14.79Electromagnetic Q (Qes)0.3Total Q (Qts)0.29Compliance Equivalent Volume (Vas)360.84 liters / 12.74 cu.ft.Peak Diaphragm Displacement Volume (Vd)695 ccMechanical Compliance of Suspension (Cms)0.2 mm/NBL Product (BL)16.54 T-MDiaphragm Mass Inc. Airload (MMs)121 gramsEfficiency Bandwidth Product (EBP)107Maximum Linear Excursion (Xmax)7 mmSurface Area of Cone (Sd)1140 cm2Maximum Mechanical Limit (Xlim)18.0 mmMounting InformationRecommended Enclosure VolumeSealedN/aVented84.95-212.38 liters / 3.00-7.50 cu.ft.Driver Volume Displaced0.234 cu.ft. / 6.62 litersOverall Diameter18", 457.2 mmBaffle Hole Diameter16.56", 420.6 mmFront Sealing GasketYesRear Sealing GasketYesMounting Holes Diameter0.28", 7.1mmMounting Holes B.C.D.17.25", 438.2mmDepth8.15", 207 mmNet Weight24.5 lbs, 11.11 kgShipping Weight28.1 lbs, 12.75 kgsMaterials of ConstructionCoil ConstructionCopper voice coilCoil FormerPolyimide formerMagnet CompositionFerrite magnetCore DetailsVented and extended core Basket MaterialsDie-cast aluminum basketCone CompositionPaper coneCone Edge CompositionCloth cone edgeDust Cap CompositionSolid composition paper dust cap
Price: 249.99 USD
Location: Norwalk, California
End Time: 2024-09-09T09:41:04.000Z
Shipping Cost: 2.99 USD
Product Images
Item Specifics
Return shipping will be paid by: Seller
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money back or replacement (buyer's choice)
Unit Type: Unit
Unit Quantity: 1
Compatible Brand: Universal
Type: Subwoofer Driver
MPN: SIGMA PRO 18-4
Brand: Eminence
Impedance: 4
Power RMS (Watts): 700
Power Max (Watts): 1400
Frequency Range: 32Hz - 2Khz
Sensitivity (dB): 97.6
Magnet Weight (oz): 120
Gap Height (mm): 9.5
VoiceCoilDia (in): 3
Resonant Frequency (fs) Hz: 32
DC Resistance (Re): 3.35
Coil Inductance (Le) mH: 0.85
Mechanical Q (Qms): 14.79
Electromagnetic Q (Qes): 0.3
Total Q (Qts): 0.29
Compliance Equivalent Volume (Vas) ltr: 360.84
Compliance Equivalent Volume (Vas) cuft: 12.74
Peak Diaphragm Displacement Volume (Vd): 695
Mechanical Compliance of Suspension (Cms) mm/N: 0.2
BL Product (BL) T-M: 16.54
Diaphragm Mass Inc. Airload (MMs) grams: 121
Efficiency Bandwidth Product (EBP): 107
Maximum Linear Excursion (Xmax) mm: 7
Surface Area of Cone (Sd) cm2: 1140
Maximum Mechanical Limit (Xlim) mm: 18
Driver Volume Displaced (liters): 6.62
Overall Diameter (in): 18
Baffle Hole Diameter (in): 16.56
Screw Holes Diameter (in): 0.28
Mounting Hole Centers across (in): 17.25
Depth (in): 8.15
Net Weight (lbs): 24.5
Ship Weight (lbs): 28.1
Coil Construction: Copper voice coil
Coil Former: Polyimide former
Magnet Material: Ferrite magnet
Basket Material: Die-cast aluminum basket
Cone Composition: Paper cone
