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| DELTA PRO-18A |
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| SPECIFICATION |
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| Nominal Basket Diameter |
18'', 457mm |
| Nominal Impedance* |
8 ohms |
| Power Rating |
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 Watts |
500W |
| Music Program |
1000W |
| Resonance |
28Hz |
| Usable Frequency Range |
37Hz-250Hz |
| Sensitivity*** |
96 |
| Magnet Weight |
67 oz. |
| Gap Height |
0.380'', 9.53mm |
| Voice Coil Diameter |
2.5'', 63.5mm |
| THIELE & SMALL PARAMETERS |
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| Resonant Frequency (fs) |
28Hz |
| DC Resistance (Re) |
5.3 |
| Coil Inductance (Le) |
3.43mH |
| Mechanical Q (Qms) |
10.38 |
| Electromagnetic Q (Qes) |
0.33 |
| Total Q (Qts) |
0.32 |
| Compliance Equivalent Volume (Vas) |
493.2 liters / 17.41cu.ft. |
| Peak Diaphragm Displacement Volume (Vd) |
796cc |
| Mechanical Compliance of Suspension (Cms) |
0.25mm/N |
| BL Product (BL) |
18.9 T-M |
| Diaphram Mass inc. Airload (Mms) |
128 grams |
| Efficiency Bandwidth Product (EBP) |
84 |
| Maximum Linear Excursion (Xmax) |
6.7mm |
| Surface Area of Cone (Sd) |
1188.0 cm2 |
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| Maximum Mechanical Limit (Xlim) |
15.0mm |
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| MOUNTING INFORMATION |
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| Recommended Enclosure |
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| Sealed |
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| Vented |
85-297 liters/3.0-10.5 cu.ft. |
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| Overall Diameter |
18.00'', 457.2mm |
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| Baffle Hole Diameter |
16.57'', 420.9mm |
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| Front Sealing Gasket |
fitted as standard |
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| Rear Sealing Gasket |
fitted as standard |
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| Mounting Holes Diameter |
0.28'', 7.1mm |
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| Mounting Holes B.C. D. |
17.25'', 438.2mm |
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| Depth |
8.13'', 207mm |
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| Net Weight |
17.0 lbs, 7.7 kg |
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| Shipping Weight |
20.5 lbs, 9.3 kg |
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| MATERIALS OF CONSTRUCTION |
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| Coil Construction |
Copper voice coil |
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| Coil Former |
Polyimide former |
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| Magnet Composition |
Ferrite magnet |
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| Core Details |
Vented and extended core |
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| Basket Materials |
Die-cast aluminum basket |
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| Cone Composition |
Paper cone |
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| Cone Edge Composition |
Cloth cone edge |
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| Dustcap Composition |
Solid composition paper dust cap |
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