Scan-Speak
Scan-Speak - 7" Discovery Mid-Woofer - 18W/4424G00
Scan-Speak - 7" Discovery Mid-Woofer - 18W/4424G00
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$124.95
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$124.95
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Description
18cm Midwoofer 4ohm, Coated Fibreglass Cone, Ferrite Magnet. The Discovery series offer traditional design, superior sound, a solid construction, and a wide range of variants. Combining these elements - plus a wealth of technical features and finesses - it gives our customers the possibility of acquiring a tailor-made Scan-Speak solution with very good performance at a reasonably low price point.
Features
- High Output 91dB @ 2.83V
- Excellent Midrange Performance
- Coated NRSC Fibre Glass Cone
- Low Damping SBR Rubber Surround
- Die cast Alu Chassis vented below spider
Specifications
Specifications
General
| Driver type | Mid-Woofer |
|---|---|
| Nominal size | 7" |
| Nominal impedance | 4Ω |
| Series | Discovery |
| Power handling (RMS) | 50 W |
| Power handling (program) | 110 W |
| Sensitivity | 90.9 dB |
| Suggested alignment | Ported |
| Frequency range | fs – 8,000 Hz |
Thiele/Small parameters
| Resonant frequency (Fs) | 49 Hz |
|---|---|
| DC resistance (Re) | 3.2 Ω |
| Minimum impedance (Zmin) | 4.1 Ω |
| Voice coil inductance (Le) | 0.47 mH |
| Mechanical Q (Qms) | 4.57 |
| Electrical Q (Qes) | 0.42 |
| Total Q (Qts) | 0.38 |
| Equivalent volume (Vas) | 24.1 L |
| Compliance (Cms) | 0.92 mm/N |
| Moving mass (Mms) | 11.4 g |
| Mechanical resistance (Rms) | 0.77 kg/s |
| Force factor (Bl) | 5.2 T·m |
| Effective piston area (Sd) | 137 cm² |
| Linear excursion (Xmax, one-way) | 2.8 mm |
| Mechanical excursion (Xmech) | 8 mm |
| Displacement volume (Vd) | 38.36 cm³ |
| Efficiency bandwidth product (EBP) | 116.7 |
| Effective piston diameter (D) | 132 mm |
| Impedance at resonance (Zo) | 38 Ω |
Motor
| Voice coil height | 10.5 mm |
|---|---|
| Air gap height | 5 mm |
| Voice coil layers | 2 |
Mounting
| Overall diameter | 179.2 mm |
|---|---|
| Cutout diameter (suggested) | ≈ 145.3 mm |
| Mounting depth | 72.2 mm |
| Flange thickness | 5.2 mm |
| Bolt circle diameter | 167 mm |
| Mounting holes | 6 |
| Mounting hole diameter | 5.3 mm |
| Volume displaced by driver | 0.28 L |
| Voice coil diameter | 25 mm |
| Weight | 1.1 kg |
Materials
| Cone | Coated Fibreglass |
|---|---|
| Surround | SBR |
| Basket | Cast Aluminium |
| Magnet | Ferrite |
Typical box tunings
| Closed box: box volume | 13 L |
|---|---|
| Closed box: corner frequency | 85 Hz |
| Vented box: box volume | 26 L |
| Vented box: box resonance | 48 Hz |
| Vented box: corner frequency | 47 Hz |
- Xmax is quoted one-way (peak), not peak-to-peak.
- Sensitivity measured at 2.83V/1m.
- Power handling (RMS) is Scan-Speak's 100-hour RMS noise test (IEC 18.4); program power is its long-term maximum power (IEC 18.2).
Downloads
- 18W/4424G00 Datasheet
- 18W/4424G00 Drawing
- 18W/4424G00 Adv. Parameters
- 18W/4424G00 3D model
- 18W/4424G00 Cutout & Recess Template (NB Audio) Straight off Scan-Speak's spec sheet: flange outline, recess depth, bolt holes. Scaled from Scan-Speak's drawing, so close but not guaranteed exact: cutout. Check it against your driver before you cut.
Where do these figures come from? See the source of each one
