Micro
A four-inch aluminium cone and a 19 mm textile dome, on a square-framed chassis drawn for a narrow baffle — the compact two-way of the range.
About the Micro
One four-inch midwoofer and one 19 mm dome per cabinet. The Micro is drawn for the places a full-size standmount will overwhelm: a desk, a bookshelf, the near field of a small room, where the distance from driver to ear is measured in feet.
Per cabinet: one 4″ SB12PAC25-4 aluminium-cone midwoofer and one SB19ST-C000-4 textile dome. For the same kit with a ceramic cone in place of the aluminium one, see the Micro-C.
The Micro is a compact two-way with a genuinely small footprint — bookshelf, desktop or nearfield. An aluminium cone midwoofer under a soft dome, with the port firing forward out of the bottom of the baffle so the speaker can sit close to a wall.
At 260 mm tall it is the smallest thing SB Acoustics draw, and the case they make for it is simple enough: far better sound than a pre-assembled consumer speaker of the same size, from a crossover you can see.
In the kit
- Drive units per cabinet
- 1 × 4″ SB12PAC25-4 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.
| Specification | Value |
|---|---|
| Speaker type | Two-way standmount |
| Frequency range | 70 – 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) | 260 × 130 × 170 mm (10.2 × 5.1 × 6.7 in) |
| Net weight | 4.2 kg cabinet only, 7.4 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″ SB12PAC25-4 per cabinet
A 25.4 mm voice coil under an aluminium cone, on a rubber surround, a ferrite motor and a square injection-moulded chassis. The square frame is the tell: it lets the driver sit close to its neighbours on a narrow baffle.
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Nominal impedance | 4 Ω | Force factor, Bl | 4.35 Tm |
| Free air resonance, Fs | 52.5 Hz | Compliance, Cms | 1.50 mm/N |
| Sensitivity (2.83 V / 1 m) | 87 dB | Mechanical resistance, Rms | 0.4 kg/s |
| Total Q-factor, Qts | 0.31 | Voice coil diameter | 25.4 mm |
| Mechanical Q-factor, Qms | 5.0 | Voice coil height | 15 mm |
| Electrical Q-factor, Qes | 0.33 | Air gap height | 5 mm |
| Equivalent volume, Vas | 5.3 L | Linear coil travel (p-p) | 10 mm |
| Effective piston area, Sd | 50 cm² | Magnetic flux density | 1.03 T |
| DC resistance, Re | 3.1 Ω | Magnet weight | 0.40 kg |
| Voice coil inductance, Le | 0.25 mH | Rated power handling | 30 W |
| Moving mass incl. air, Mms | 6.1 g | Net weight | 0.86 kg |
87 dB at a Qts of 0.31, Fs 52.5 Hz, with 10 mm of linear travel on a 6.1 g moving mass.
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: 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.