Oberton 18B500

SPECIFICATIONS

THIELE-SMALL PARAMETERS

Nominal Diameter
Impedance
Minimum Impedance
Power Capacity AES ¹
Program Power ²
Sensitivity
Frequency Range
Voice Coil Diameter
Voice Coil Material
Voice Coil Former
Voice Coil Winding Depth
Magnet Gap Depth
Cone Material
Basket
Magnet
Flux Density

18"/461 inch/mm
8 Ohm 
6.38 Ohm
600 W
1200 W
(50 - 200 Hz) 99 dB/W/m
35 - 1000 Hz
77 mm
Copper
Glassfiber
23 mm
11 mm
Paper
Die cast aluminium
Ferrite
1.27 T

Resonance Frequency
Mechanical Efficiency Factor (Qms)
Electrical Efficiency Factor (Qes)
Total Q (Qts)
Equivalent Air Volume (Vas )
Diaphragm mass ind. airload (Mms)
Voice Coil Resistance Re
Effective Diagram Area (Sd)
Peak Linear Displacement of Diaphragm (Xmax)*
Mechanical Compliance of Suspension (Cms)
BL Product (BL)
V.C. Inductance at 1 kHz (Le)

34.90 Hz
9.24
0.284
0.275
243.91 Litress
146.79 grams
5.10 Ohms
1110 cm²
± 8.75 mm
0.142 mm/N
24.06 T.m
1.37 mH

MOUNTING INFORMATION

1. AES standard. Power is calculated on rated minimum impedance. Measurement is in 180 L box enclosure tuned 43 Hz using a 40-400 Hz band limited pink noise test signal applied continuously for 2 hours.
2. Program power is defined as 3db greater than AES Power Capacity.

* Linear Mathematical Xmax is calculated as: (Hvc - Hg)/2 + Hg/4 where Hvc is the voice coil depth and Hg is the gap depth.

Overall Diameter
Baffle Hole Diameter 
Number of Mounting Holes
Bolt Circle Diameter
Overall Depth
Net Weight

461 mm
416 mm
8 eliptic 7 x 8,5 mm
438/441 mm
204 mm
12.30 kg