| Specification | Value | Unit | |
| Overall diameter | 8158 | mm | |
| Cutout Diameter/Square | 137 | mm | |
| Min. frontplate thickness | 6 | mm | |
| Overall depth | 90 | mm | |
| Motor assembly depth | 42 | mm | |
| Motor assembly diameter | 120 | mm | |
| Screwfitting | DIN 7984 / Ø 4.50 | mm | |
| Terminal | +: 6.3 x 0.8 / -: 4.8 x 0.8 | mm | |
| Shipping weight (pair) | 5.2 | Kg | |
| Shipping box size (pair) | 180 / 180 / 240 | mm | |
C158-6-851 Ceramic Bass-Midrange
Closed Box design parameters
Vb: 2.3L, -16dB @ 40Hz, F-3dB: 98Hz, Q: 0.71 (typical)
Vb: 7L, -14dB @ 40Hz, F-3dB: 96Hz, Q: 0.50 (extended bass)
Vented Box design parameters
Vb: 10L, Port diameter: 40mm, Length: 145mm, Fres: 46Hz, F-3dB: 47Hz, Q: 0.58 (typical)
Vb: 15L, Port diameter: 40mm, Length: 100mm, Fres: 43Hz, F-3dB: 41Hz, Q: 0.50 (extended bass)
Vb: 6.5L, Port diameter: 40mm, Length: 220mm, Fres: 48Hz, F-3dB: 54Hz, Q: 0.61 (0.7dB Ripple @ 100Hz)
Highlights
6.25 inch bass-midrange for small bookshelf monitors or slim floorstanders
38mm titanium voice coil former120mm ferrite motor for high performance in small enclosures
Long excursion design for high SPL capabilities
| Dome material | Ceramic |
| Application | Bass‑Midrange |
| Overall diameter | 158 MM |
| Cutout Diameter/Square | 137 MM |
| Overall depth | 90 MM |
| Motor assembly depth | 42 mm |
| Motor assembly diameter | 120 mm |
Main Features
overhung motor design
38 mm voice coil
soft rubber surround
vented vc, pole piece & spider
35 HZ - 3000 HZ
Mechanical Data
Thiele/Small Parameters
| Spezifikation | Wert | Einheit | |
| Sensitivity (2.83V / 1m) | Spl | 88 | dB |
| DC-resistance | Re | 6.07 | Ohm |
| Resonance frequency | Fs | 31 | Hz |
| Equivalent volume of air | Vas | 25.7 | ltr |
| Mechanical Q | Qms | 5.09 | |
| Electrical Q | Qes | 0.29 | |
| Total Q | Qts | 0.28 | |
| EEffective piston area | Sd | 113 | Cm2 |
| Moving mass | Mms | 18.5 | g |
| Suspension compliance | CMs | 1.42 | mm/n |
| Mechanical resistance | Rms | 0.71 | Kg*s |
voice coil parameters
| Specification | Value | Unit | |
| Power handling | P | 120 | W |
| Linear excursion | Xmax | +/-5 | mm |
| Voice coil diameter | 38 | mm | |
| Voice coil former material | Ti | ||
| Voice coil material | Cu | ||
| Voice coil inductance | Le | 0.77 | mH |
| Force factor | Bl | 8.7 | N/A |
| Motor type | Underhung | ||
| Ferrofluid filling | No | ||
Frequency Response [DB]
Impedance [Ohm]
Harmonic Distortion [%]
