SB16PFCR25-4
UK STOCK ITEM
The SB16PFCR25-4 by SB Acoustics is a 6 inch 4 ohm midwoofer speaker featuring a blended paper fibre cone, a vented reinforced plastic chassis and an optimised motor system with a high power ferrite magnet. Good efficiency, smooth extended response, excellent value.
Also available in 8 ohms: SB16PFCR25-8.
| Resonant frequency (fs) | 35 Hz | Nominal impedance (Zn) | 4 Ω |
| Mechanical Q factor (Qms) | 32.76 |
DC resistance (Re) | 3.2 Ω |
| Electrical Q factor (Qes) | 0.39 |
Max power handling | 40 W |
| Total Q factor (Qts) | 0.34 |
Sensitivity (2.83V/1m) |
89.5dB |
| Equivalent volume (Vas) | 32.7L |
Chassis diameter |
176mm |
As always, items arrived nicely packed and promptly.
I purchased these as substitutes for another driver that was used in a transmission line design. The old drivers had way too high a Q and sounded a bit boomy.
I chose these mainly because the diameter was exactly the same as the original drivers, meaning no cabinet reworking :)
They behaved very well in the transmission line cabinet and don't exhibit any peaks or nulls in the response. Very easy to work with and the 2nd order crossover couldn't be much simpler, crossed at around 2.4K which was mainly determined by the DT105 tweeter I was using, the drivers blend really well together.
Overall these are a very good sounding driver with a natural and neutral sound.
For those interested, I have included pictures of the speaker, crossover and measurements.
Tip: Run these drivers in before measuring and designing the crossover!
Excellent review Patrick, thankyou very much.
Will & Caroline
