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18SOUND 21LW2600

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18SOUND (Eighteen Sound) 21LW2600 — 21" / 21 inch · Woofer · Subwoofer / Bass · Ferrite Magnet
4" voice coil · 8 Ω
Part no.: 42A-CHS-TT-18S-0001

514.00 € 514.0 EUR 514.00 €

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18SOUND 21LW2600 — 21" · Woofer

1600 W AES · 97 dB Sensitivity · Frequency range 35 Hz – 1400 Hz

Technical data

  • Diameter: 21 "
  • Voice coil: 4 "
  • Power handling: 1600 W AES
  • Sensitivity: 97 dB
  • Impedance: 8 Ω
  • Magnet: Ferrite
  • Weight: 17.1 kg
  • Mounting depth: 245 mm
  • Frequency range: 35 – 1400 Hz

Datasheet (PDF) · Manufacturer page

Series: LW · Part no.: 42A-CHS-TT-18S-0001

18Sound 21LW2600: 21" ferrite subwoofer with 14.6 mm Xmax and 1600 W

The 21LW2600 from 18Sound's LW series is about excursion and power handling: 14.6 mm Xmax, 1600 W at 8 Ω and a ferrite motor with 4" voice coil delivering 32.5 Tm. The moving mass of 0.398 kg pushes the resonance down to 27 Hz; with Qts 0.33 and Vas 333 l it is a classic reflex subwoofer for low tunings.

The high Qms of 23.1 is remarkable – mechanical losses in the suspension are very low, and damping comes almost entirely from the motor. That speaks for a well-matched spider and surround and makes the driver predictable in simulation. 97 dB sensitivity is a solid figure for a long-throw 21"; the 17.1 kg are down to the ferrite magnet.

Use and enclosure

An EBP of 79 allows either approach. The bass reflex guideline: around 207 l tuned to 31 Hz with f3 near 33 Hz – a full-grown subwoofer with genuine deep bass and no equalisation. Sealed would be about 93 l with fc at 58 Hz, which works with DSP boost in installations but uses up Xmax and power more quickly. Fine-tune with the enclosure calculator at 42.audio.

The 35 to 1400 Hz operating range limits it to subwoofer and bass duty; the crossover sits low. A 245 mm mounting depth is moderate for a 21". With 14.6 mm Xmax and 1600 W, an amplifier with a limiter is worthwhile, because at low tunings the high-pass decides the driver's lifespan.

What to look out for

  • Xmax 14.6 mm, Mms 0.398 kg – long-throw design for low reflex tuning
  • Qms 23.1: hardly any mechanical losses, damping comes from the motor
  • 1600 W at 8 Ω, Re 5.2 Ω
  • Ferrite, 17.1 kg, mounting depth 245 mm
  • Bass reflex guideline 207 l / 31 Hz – plan the space

Frequently asked questions

21LW2600 or 21NLW5300 – which is the right one?

Both sit at Qts 0.32–0.33 with similar Vas (333 l against 325 l). The 21NLW5300 uses neodymium and is lighter, the 21LW2600 relies on ferrite. In enclosure terms they are close.

How deep does a bass reflex box with the 21LW2600 play?

As a guideline, f3 is around 33 Hz in about 207 l tuned to 31 Hz. Smaller boxes can be tuned higher but lose extension; the enclosure calculator at 42.audio shows the trade-offs.

How much amplifier power makes sense?

An amplifier around 1600 W at 8 Ω with a limiter and a high-pass below the tuning frequency. At 97 dB sensitivity the driver reaches high levels with less power too.

At 42.audio you get the 18SOUND 21LW2600 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 fs27 Hz
Total Q Qts0.33
Electrical Q Qes0.34
Mechanical Q Qms23.1
Equivalent volume Vas333.0 l
Moving mass Mms398.0 g
Cone area Sd1,660 cm²
Linear excursion Xmax14.6 mm
Force factor BL32.5 Tm
DC resistance Re5.2 Ω
Voice coil inductance Le2.67 mH

Enclosure suggestion

The EBP of 79 is in the intermediate range — either works; sealed plays tighter, bass reflex deeper and louder. EBP = fs / Qes = 27 / 0.34

Sealed (Qtc 0.707)

Enclosure volume Vb
92.8 l
System resonance Fc
58 Hz
Cut-off frequency F3
58 Hz

Bass reflex (QB3 after Small)

Enclosure volume Vb
171.6 l
Tuning frequency Fb
33 Hz
Cut-off frequency F3
36 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 LW
Magnet Ferrite
Impedance (Ω) 8
Power handling (W) 1600
Sensitivity (dB) 97
Frequency from (Hz) 35
Frequency to (Hz) 1400
Abmessungen & Korb
Diameter 21
Voice coil (inch) 4
Mounting depth (mm) 245
Weight (kg) 17.1
Thiele-Small-Parameter
Re (Ω) 5.2
Le (mH) 2.67
Fs (Hz) 27
Qms 23.1
Qes 0.34
Qts 0.33
Vas (l) 333
Xmax (mm) 14.6
BL (Tm) 32.5
Mms (kg) 0.398
Sd (m²) 0.166