Micro-C
A four-inch ceramic cone under a 19 mm textile dome — a two-way for a desk, a shelf or a small room.
About the Micro-C
The Micro-C is the small end of the range: one four-inch midwoofer and one 19 mm dome per cabinet, in a box you can put on a desk. Small drivers give up level and low bass; what they buy back is a point source, and a stereo image that holds together at close range.
Per cabinet: one 4″ SB12CACS25-4 ceramic-cone midwoofer and one SB19ST-C000-4 textile dome. The C is the cone — ceramic here, aluminium on the Micro.
The Micro-C is the Micro with a ceramic cone. A 4″ SB12CAC ceramic midwoofer under the same 19 mm textile dome, in a cabinet of essentially the same size — SB Acoustics reach for the words “unbelievable detail” and “packs a real punch in the bass”.
Ceramic is chosen for the same reason beryllium is chosen higher up the range: stiffness. A stiffer cone pushes its first breakup mode further above the band it has to cover, and the 68 Hz bottom end here is 2 Hz lower than the aluminium-coned Micro despite a nearly identical box.
In the kit
- Drive units per cabinet
- 1 × 4″ SB12CACS25-4 midwoofer, 1 × SB19ST-C000-4 tweeter
- Cabinets
- two, finished
- Cabinet finishes
- six
- Crossover
- one crossover set per pair
- Supplied as
- components for a pair
Specifications
SB Acoustics’ published figures for the finished Micro-C.
| Specification | Value |
|---|---|
| Speaker type | Two-way standmount |
| Frequency range | 68 – 28,000 Hz ±3 dB |
| Sensitivity (2.83 V / 1 m) | 84.5 dB |
| Nominal impedance | 4 Ω |
| Maximum SPL | 100 dB |
| Recommended amplifier | 25 – 100 W |
| Crossover frequency | 4000 Hz |
| Enclosure type | Bass reflex, front-firing slot port |
| Port tuning frequency | 49 Hz |
| Cabinet material | 15 mm MDF |
| Dimensions (H × W × D) | 262 × 132 × 170 mm (10.3 × 5.2 × 6.7 in) |
| Net weight | 4.3 kg cabinet only, 7.8 kg fully assembled |
Tweeter — One SB19ST-C000-4 per cabinet
A 19.1 mm textile dome on a ferrite motor behind an injection-moulded faceplate. A dome this small stays wide in its dispersion right to the top of the band, which is what keeps a compact two-way sounding open away from the axis.
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Nominal impedance | 4 Ω | Force factor, Bl | 1.75 Tm |
| Free air resonance, Fs | 980 Hz | Voice coil diameter | 19.1 mm |
| Sensitivity (2.83 V / 1 m) | 88.5 dB | Voice coil height | 1.8 mm |
| Total Q-factor, Qts | 1.22 | Air gap height | 3 mm |
| Mechanical Q-factor, Qms | 6.45 | Linear coil travel (p-p) | 1.2 mm |
| Electrical Q-factor, Qes | 1.50 | Magnetic flux density | 1.24 T |
| Effective piston area, Sd | 3.8 cm² | Magnet weight | 0.13 kg |
| DC resistance, Re | 3.4 Ω | Rated power handling | 30 W |
| Voice coil inductance, Le | 0.07 mH | Net weight | 0.32 kg |
| Moving mass incl. air, Mms | 0.22 g |
88.5 dB with a free air resonance of 980 Hz and 30 W rated power handling, on a moving mass of 0.22 g.
Midwoofer — One 4″ SB12CACS25-4 per cabinet
A 25.4 mm voice coil under a ceramic cone, on a rubber surround, a ferrite motor and an aluminium chassis. A ceramic cone is chosen for stiffness: it holds its shape as a piston further up the band than a softer material manages.
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Nominal impedance | 4 Ω | Force factor, Bl | 4.3 Tm |
| Free air resonance, Fs | 51 Hz | Compliance, Cms | 1.60 mm/N |
| Sensitivity (2.83 V / 1 m) | 88 dB | Mechanical resistance, Rms | 0.4 kg/s |
| Total Q-factor, Qts | 0.31 | Voice coil diameter | 25.4 mm |
| Mechanical Q-factor, Qms | 4.89 | Voice coil height | 15 mm |
| Electrical Q-factor, Qes | 0.33 | Air gap height | 5 mm |
| Equivalent volume, Vas | 5.7 L | Linear coil travel (p-p) | 10 mm |
| Effective piston area, Sd | 50 cm² | Magnetic flux density | 1.07 T |
| DC resistance, Re | 3.1 Ω | Magnet weight | 0.40 kg |
| Voice coil inductance, Le | 0.26 mH | Rated power handling | 30 W |
| Moving mass incl. air, Mms | 6.1 g | Net weight | 0.92 kg |
88 dB at a Qts of 0.31, Fs 51 Hz, with 10 mm of linear travel. 5.7 litres of Vas is what puts a driver like this in a cabinet you can lift with one hand.
The cabinets arrive finished
The cabinet set arrives cut, assembled and finished at the same works that makes the drivers, on the same machines, to the same tolerances — so the job in front of you is the acoustics: mount the drivers, wire the crossover, fit the damping.
Six finishes are drawn up for the Micro-C: white satin, white high gloss, black satin, black high gloss, red high gloss and orange high gloss. The set covers two cabinets, and it is supplied without grilles.
Tell us which finish you want when you enquire and we will confirm it against the current factory list before anything is ordered.
Come and listen.
Bring your favourite tracks. Leave with something you'll keep for decades. No pressure, no commission-chasing.