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18SOUND 10W650

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18SOUND (Eighteen Sound) 10W650 — 10" / 10 inch · Woofer/Midrange (WM) · Bass · Ferrite
2.5" voice coil · 8 Ω
Part no.: 42A-CHS-TT-18S-0027

209.00 € 209.0 EUR 209.00 €

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18SOUND 10W650 — 10" · Woofer

250 W AES · 96 dB Sensitivity · Frequency range 55 Hz – 5700 Hz

Technical data

  • Diameter: 10 "
  • Voice coil: 2.5 "
  • Power handling: 250 W AES
  • Sensitivity: 96 dB
  • Impedance: 8 Ω
  • Magnet: Ferrite
  • Weight: 4.3 kg
  • Mounting depth: 121 mm
  • Frequency range: 55 – 5700 Hz

Datasheet (PDF) · Manufacturer page

Series: W · Part no.: 42A-CHS-TT-18S-0027

18Sound 10W650: 10" mid-woofer with Qts 0.48 for larger vented boxes

Among the 18Sound 10" drivers the 10W650 is the one with the highest Qts: 0.48 at Fs 67 Hz and Vas 26 l. That is not a flaw but a different design goal. A higher Qts means less electrical damping, more level around resonance and behaviour that stays benign in larger vented boxes and in open designs. The W series relies on ferrite magnets, here with a 2.5" voice coil and 250 W AES.

With 96 dB sensitivity and a moving mass of 36.6 g the 10W650 remains usable up to 5,700 Hz, a high upper limit for a 10" driver. Le of 0.59 mH confirms the low inductance that keeps the midrange clean. Xmax 5.7 mm and BL of 12.4 Tm are moderate figures; the driver is aimed at even reproduction in full-range tops rather than maximum kick-bass impact.

Use and enclosure

The vented guide value is unusually large at 47 l with fb 54 Hz and f3 49 Hz, a consequence of the high Qts. In that volume the 10W650 reaches a low-frequency cut-off that other 10" drivers do not offer, with the nominal range starting at 55 Hz. Build a smaller box and you get a hump above the tuning frequency, which can actually be welcome in monitors used at close range. The EBP of 131 also allows a sealed box: guide value 22 l at fc 99 Hz for midrange chambers or compact closed cabinets.

The upper limit of 5,700 Hz makes the handover to a 1" compression driver on a horn from the 18Sound range straightforward. Similarly aligned are the FaitalPRO 10PR300 with Fs 65 Hz, Qts 0.48 and Vas 30.6 l and the 18Sound 10NTLW3500 with Fs 64 Hz, Qts 0.45 and Vas 18.1 l, although the latter plays in a different power class with 800 W AES and neodymium. Both are in the driver database at 42.audio for comparison.

What to look out for

  • Qts 0.48: large vented box with 47 l as guide value, smaller works with a hump.
  • 250 W AES via 2.5" coil: for tops and monitors, not for sustained high power.
  • Mounting depth 121 mm, 4.3 kg: compact and light for ferrite.
  • 8 Ω, Re 5.1 Ω: standard load for any amplifier.
  • Xmax 5.7 mm: high-pass above 55 Hz at high levels.

Frequently asked questions

Why does the 10W650 need such a large box?

The high Qts of 0.48 means little electrical damping. The calculation gives a guide value of 47 l at fb 54 Hz for a flat alignment. Smaller boxes work but produce a hump in the upper bass.

Is the 10W650 suitable for a full-range monitor without a subwoofer?

Yes, with f3 around 49 Hz in the 47 l guide volume and a range up to 5,700 Hz it covers a wide spectrum together with a 1" compression driver. 96 dB sensitivity keeps the power requirement low.

How does the 10W650 differ from the 10NTLW3500?

Both have a similar Qts of 0.45 to 0.48, but the 10NTLW3500 has neodymium, a 2x3.5" coil rated at 800 W AES and Vas 18.1 l. The 10W650 is the lighter, more affordable ferrite variant with 250 W AES for moderate levels.

At 42.audio you get the 18SOUND 10W650 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 impedance8 Ω
Resonance frequency fs67 Hz
Total Q Qts0.48
Electrical Q Qes0.51
Mechanical Q Qms9.6
Equivalent volume Vas26.0 l
Moving mass Mms36.6 g
Cone area Sd350 cm²
Linear excursion Xmax5.7 mm
Force factor BL12.4 Tm
DC resistance Re5.1 Ω
Voice coil inductance Le0.59 mH

Enclosure suggestion

The EBP of 131 suggests a bass-reflex enclosure. EBP = fs / Qes = 67 / 0.51

Sealed (Qtc 0.707)

Enclosure volume Vb
22.2 l
System resonance Fc
99 Hz
Cut-off frequency F3
99 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
46.1 l
Tuning frequency Fb
56 Hz
Cut-off frequency F3
52 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 %.

Specifications

Allgemein
Manufacturer 18SOUND
Category Low Frequency
Series W
Magnet Ferrite
Impedance (Ω) 8
Power handling (W) 250
Sensitivity (dB) 96
Frequency from (Hz) 55
Frequency to (Hz) 5700
Abmessungen & Korb
Diameter 10
Voice coil (inch) 2.5
Mounting depth (mm) 121
Weight (kg) 4.3
Thiele-Small-Parameter
Re (Ω) 5.1
Le (mH) 0.59
Fs (Hz) 67
Qms 9.6
Qes 0.51
Qts 0.48
Vas (l) 26
Xmax (mm) 5.7
BL (Tm) 12.4
Mms (kg) 0.0366
Sd (m²) 0.035