SB15CAC30-8 Ceramic/Aluminum Mid Bass in 4 ohm
This 4-ohm version offers more flexibility than just the impedance. 4-ohm versions are popular as midranges since you get a boost in SPL. They are popular for MTM designs as you can put the two woofers in series and obtain an 8-ohm rating suitable for less than stellar receivers. The T/S parameter vary a bit too. Qts is usually lowered so box alignment will be affected. In this woofers case, it is suited more to a vented alignment while the 8 ohms either.
While not a pure ceramic cone similar to Accuton, it does create a very stiff cone with low weight.
These models have appeared in commercial systems by Revel.
I am not sure the popularity of white cones, but in person, these tend to be more of a gray/silver tint which is unique.
This unit will be featured in a new kit by Jeff Bagby that is commissioned by SB Acoustics. A link will be supplied when available, which should be April of 2018.
- Imp – 4 Ohm
- Fs – 32.5 Hz
- Qts – .31
- Vas – 20.2L
- SPL – 88dB
- Xmax – 5mm
- Outer Dia. – 150mm
- Cut out – 124mm
- Depth – 69mm
SB Ceramic cones consist of an aluminum/ceramic dual layer cone. Ceramic provides a very hard and robust surface with improved sonic properties and cosmetic appearance.
- Vented cast aluminum chassis for optimum strength and low compression
- Geometrically reinforced ceramic cone for optimum piston operation and reduced
- Soft low damping rubber surround for improved transient response
- Non-conducting fiberglass voice coil former for minimum damping
- Extended copper sleeve on pole piece for low inductance and low distortion
- CCAW voice coil for reduced moving mass
- Long life silver lead wires
- Vented pole piece for reduced compression
Why Ceramic? Ceramic cones offer smoothness and harmonic richness unavailable from conventional paper cone material. Ceramic materials also offer significantly higher stiffness numbers and slightly better internal losses than typical metals such as titanium or aluminum. Compared to polymers, paper, and other soft materials, ceramics provide:
- Significantly higher stiffness to weight ratio.
- More consistent performance over a wide range of temperature and humidity. For example, polypropylene’s performance changes dramatically with temperature, while paper can be significantly affected by humidity.
- Superior immunity to UV light and sunlight.
- Superior immunity to water and salt water.
- Superior immunity to combustibility