18SOUND 10NW650
18SOUND (Eighteen Sound) 10NW650 — 10" / 10 inch · Woofer/Midrange (WM) · Bass · Neodymium
2.5" voice coil · 16 Ω
Part no.: 42A-CHS-TT-18S-0072
Documents
18SOUND 10NW650 — 10" · Woofer
300 W AES · 95.5 dB Sensitivity · Frequency range 60 Hz – 6000 Hz
Technical data
- Diameter: 10 "
- Voice coil: 2.5 "
- Power handling: 300 W AES
- Sensitivity: 95.5 dB
- Impedance: 16 Ω
- Magnet: Neo
- Weight: 2.7 kg
- Mounting depth: 131 mm
- Frequency range: 60 – 6000 Hz
Datasheet (PDF) · Manufacturer page
Series: NW · Part no.: 42A-CHS-TT-18S-0072
18Sound 10NW650: lightweight 10" neodymium mid-woofer with 95.5 dB and 16 Ω
At 2.7 kg the 18Sound 10NW650 is one of the lightest 10" drivers in the 42.audio range. The NW series combines a neodymium motor with a 2.5" voice coil and targets tops, monitors and line array elements where every kilogram counts. 300 W AES and 95.5 dB sensitivity are solid figures for this weight class, and the usable range of 60 to 6,000 Hz is unusually wide.
The basis is a light cone with 34.1 g of moving mass and a motor with BL of 21 Tm. Qts 0.27 at Fs 51 Hz and Vas 50 l describes a driver with a soft suspension and strong electrical damping that stays well controlled in a vented box. Le of 1.55 mH, on the other hand, is a high value that makes the impedance rise towards high frequencies pronounced; keep that in mind when designing the midrange section of the crossover.
Use and enclosure
As a mid-woofer in a 2-way top the vented guide value is 18 l with fb 70 Hz and f3 83 Hz. The EBP of 182 confirms that the driver works best in a compact, relatively high-tuned vented box with a subwoofer taking care of the low end. Set the crossover to the sub above 60 Hz and the 7 mm of excursion stays free for level in the kick-bass band. Sealed, the guide value is 8.5 l at fc 134 Hz for use as a midrange in 3-way systems.
The upper limit of 6,000 Hz allows a high handover to a 1" compression driver on a horn from the 18Sound range, which favours small horns and compact tops. The version at 42.audio is built as 16 Ω with Re 12.2 Ω, ideal for two drivers in parallel at 8 Ω; the driver is also made as an 8 Ω version. A comparison from the driver database: the 18Sound 10NTLW2000 with Fs 50 Hz, Qts 0.26 and Vas 38 l is very close and also in the shop, while the B&C 10NW64 with Fs 59 Hz, Qts 0.26 and Vas 22 l needs a smaller box.
What to look out for
- Only 2.7 kg: neodymium motor, ideal for portable tops and stage monitors.
- 16 Ω, Re 12.2 Ω: two in parallel give 8 Ω, plan amplifier power accordingly.
- Le 1.55 mH: pronounced impedance rise, design the midrange crossover for it.
- Mounting depth 131 mm: fits shallow monitor and top cabinets.
- Xmax 7 mm at 300 W AES: set a high-pass above 60 Hz.
Frequently asked questions
Does a 16 Ω 10NW650 make sense on a normal amplifier?
Yes, the amplifier delivers less power into 16 Ω than into 8 Ω, which is usually enough at 95.5 dB sensitivity. The real benefit shows with two drivers in parallel, which together present 8 Ω.
Which enclosure suits the 10NW650?
A vented box of about 18 l tuned to 70 Hz as a guide value, giving an f3 around 83 Hz. For midrange duty a sealed chamber of 8.5 l is enough. The enclosure calculator at 42.audio provides the exact alignment.
How does the 10NW650 differ from the 18Sound 10NTLW2000?
Both share similar parameters with Qts around 0.26 to 0.27 and Fs around 50 Hz. The 10NTLW2000 has a dual-gap motor and Vas 38 l, while the 10NW650 with Vas 50 l has a slightly softer suspension and is built for minimum weight at 2.7 kg.
At 42.audio you get the 18SOUND 10NW650 with datasheet PDF, all key data in the driver database and the enclosure calculator. More drivers from this manufacturer: Atlas 18Sound.
Thiele-Small parameters
| Nominal impedance | 16 Ω |
|---|---|
| Resonance frequency fs | 51 Hz |
| Total Q Qts | 0.27 |
| Electrical Q Qes | 0.28 |
| Mechanical Q Qms | 5 |
| Equivalent volume Vas | 50.0 l |
| Moving mass Mms | 34.1 g |
| Cone area Sd | 346 cm² |
| Linear excursion Xmax | 7 mm |
| Force factor BL | 21 Tm |
| DC resistance Re | 12.2 Ω |
| Voice coil inductance Le | 1.55 mH |
Enclosure suggestion
The EBP of 182 suggests a bass-reflex enclosure. EBP = fs / Qes = 51 / 0.28
Sealed (Qtc 0.707)
- Enclosure volume Vb
- 8.5 l
- System resonance Fc
- 134 Hz
- Cut-off frequency F3
- 134 Hz
Bass reflex (QB3 after Small)recommended
- Enclosure volume Vb
- 13.3 l
- Tuning frequency Fb
- 77 Hz
- Cut-off frequency F3
- 91 Hz
Vb is the required net internal volume, Fb the tuning frequency of the reflex port and F3 the frequency at which the level has dropped by 3 dB. Calculated approximation after Small. A starting point for simulation, not a finished build plan.
Comparable drivers
Same size, same type, Qts within ±30 %.
- PRV Audio 10W1000-NDY-4fs 50.19 Hz · Qts 0.27 · Vas 46.36 l · in the database
- 18 Sound 10NTLW2000fs 58 Hz · Qts 0.27 · Vas 35.4 l · in the database
- 18 Sound 10NTLW2000fs 50 Hz · Qts 0.26 · Vas 38 l · in the shop
- 18 Sound 10NTLW2500fs 61 Hz · Qts 0.27 · Vas 22 l · in the database
- B&C Speakers 10NDL64fs 56 Hz · Qts 0.26 · Vas 31 l · in the database
- B&C Speakers 10NW64fs 59 Hz · Qts 0.26 · Vas 22 l · in the database
Specifications
| Allgemein | |
|---|---|
| Manufacturer | 18SOUND |
| Category | Low Frequency |
| Series | NW |
| Magnet | Neo |
| Impedance (Ω) | 16 |
| Power handling (W) | 300 |
| Sensitivity (dB) | 95.5 |
| Frequency from (Hz) | 60 |
| Frequency to (Hz) | 6000 |
| Abmessungen & Korb | |
|---|---|
| Diameter | 10 |
| Voice coil (inch) | 2.5 |
| Mounting depth (mm) | 131 |
| Weight (kg) | 2.7 |
| Thiele-Small-Parameter | |
|---|---|
| Re (Ω) | 12.2 |
| Le (mH) | 1.55 |
| Fs (Hz) | 51 |
| Qms | 5 |
| Qes | 0.28 |
| Qts | 0.27 |
| Vas (l) | 50 |
| Xmax (mm) | 7 |
| BL (Tm) | 21 |
| Mms (kg) | 0.0341 |
| Sd (m²) | 0.0346 |