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bits.00aud.io by 00 Audio

Eighteen Sound 21NLW9001 4Ω

LF Driver
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Media

Eighteen Sound 21NLW9001 21 inch 4 ohm loudspeaker driver view 1
Eighteen Sound 21NLW9001 21 inch 4 ohm loudspeaker driver view 2
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Overview

LF Driver
Eighteen Sound

Eighteen Sound 21NLW9001

Eighteen Sound 21NLW9001 is a 21" 4 ohm LF driver rated at 1800W RMS. The validated T/S data includes Fs 31Hz, Qts 0.34, Vas 272L, Xmax 14mm, sensitivity 95.4dB, plus 2327cm³ Vd and 84 EBP. bits tracks vendor pricing, datasheet links, simulator import data, and similar drivers from the same loudspeaker database.

Size
21"
Impedance
4Ω
RMS Power
1800W
Sensitivity
95.4dB
EBP
84
Either alignment
Vd
2327cm³
Datasheet

Datasheet traces

Frequency and impedance curves traced from the manufacturer PDF.

2 curves
10498918579501002005001k2kHzdBfrequency response
frequency response240 ptsp2medium
Curve provenanceInspect 2 tracesHide details

These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works

  • frequency response

    Frequency response

    Trace datasheet-response-trace-poc/v2
    240 plotted pointsSource file SHA-256 01fe24105abd…Medium confidence1,981 selected pixels of 2,591
    Manufacturer datasheet, page 2

  • impedance

    Impedance response

    Trace datasheet-response-trace-poc/v2
    240 plotted pointsSource file SHA-256 01fe24105abd…Medium confidence646 selected pixels of 903
    Manufacturer datasheet, page 2

T/S Parameters

Valid
Canonical
Fs31Hz
Qts0.34
Qes0.37
Qms4.5
Vas272.0L
Re2.9Ω
Le2.20mH
BL23.8Tm
Sd1662cm²
Mms375g
Xmax14.0mm
SPL95dB
Power1800W
Power Nominal1800W
Impedance4Ω
F Low25Hz
F High1500Hz
What this validation status means

Pricing & availability

Price definitions

No standard offers found

Check the manufacturer website for current pricing.

Use this driver

Open it in 00 Simulator, download it for your enclosure tool, or copy the specification values.

Files use canonical values. Required mechanical fields are derived only where the target format needs them.

Hornresp

.txt · Hornresp driver database

Driver file ready to place in Hornresp’s Drivers folder.

Download for Hornresp

WinISD

.wdr · WinISD driver editor

Native WinISD driver record with the required SI conversions.

Download for WinISD

BASTA!

.bastaelement · BASTA! loudspeaker simulator

Native BASTA! element file using its documented SI-unit fields.

Download for BASTA!

VituixCAD

.wdr · VituixCAD 2 Enclosure

A WinISD driver file that VituixCAD imports directly.

Download for VituixCAD

00 Simulator

Direct import · Web app

Start a new enclosure simulation with this driver already loaded.

Open in 00 Simulator

Copy spec sheet

Plain text · Clipboard

Copy the available values as a clean label-and-value list.

Dimensions & Physical

Weight13.4kg
Diameter545.0mm
Overall Depth250.0mm
Cutout Diameter492.0mm
Bolt Circle Diameter520.0mm

Similar Drivers

Size stays fixed. Tune the T/S ranges to change what counts as a match, or add a specific driver to compare it directly.

Search Similar
Eighteen Sound 21NLW9001 21 inch 4 ohm loudspeaker driver similar-driver reference
Reference
Eighteen Sound
21NLW9001
21"
Compare on

Matches sit inside every range. Size stays fixed automatically.

Qts
Qes
Vas
L
Xmax
mm
BL
Tm

5 active T/S params, plus size. Pin a driver to open a side-by-side comparison.

12 matches

Compare a specific driver

Added drivers stay at the front of the list, whatever the ranges say.

B&C 21SW115 21 inch 4 ohm loudspeaker driver similar driver
94%
Similarity
£481.99
B&C
21SW115
21"
Xmax14mm0%
Qts0.36+6%
BL24.8Tm+4%
Vas278L+2%
Qes0.370%
Fane COLOSSUS PRIME 21XS 21 inch 8 ohm loudspeaker driver similar driver
82%
Similarity
Fane
COLOSSUS PRIME 21XS
21"
Xmax14mm0%
Qts0.340%
BL31.3Tm+32%
Vas266L-2%
Qes0.35-4%
Image unavailable
82%
Similarity
Precision Devices
PD.2155-1F
21"
Xmax14mm0%
Qts0.340%
BL31.3Tm+32%
Vas266L-2%
Qes0.35-4%
Fane COLOSSUS PRIME 21NDXL 21 inch 8 ohm loudspeaker driver similar driver
80%
Similarity
Fane
COLOSSUS PRIME 21NDXL
21"
Xmax14mm0%
Qts0.36+6%
BL30Tm+26%
Vas241L-11%
Qes0.37+1%
Image unavailable
80%
Similarity
£613.97
Precision Devices
PD.2155-1N
21"
Xmax14mm0%
Qts0.36+6%
BL30Tm+26%
Vas241L-11%
Qes0.37+1%
B&C 21SW115 21 inch 8 ohm loudspeaker driver similar driver
75%
Similarity
£481.99
B&C
21SW115
21"
Xmax14mm0%
Qts0.37+9%
BL30.1Tm+26%
Vas318L+17%
Qes0.39+5%
SB Audience NERO-21SW1100D 21 inch 8 ohm loudspeaker driver similar driver
74%
Similarity
£343.60
SB Audience
NERO-21SW1100D
21"
Xmax12.2mm-13%
Qts0.340%
BL30Tm+26%
Vas312.6L+15%
Qes0.35-5%
Eighteen Sound 21NTLW5000 21 inch 4 ohm loudspeaker driver similar driver
72%
Similarity
Eighteen Sound
21NTLW5000
21"
Xmax17.5mm+25%
Qts0.32-6%
BL25Tm+5%
Vas300L+10%
Qes0.33-11%
Eighteen Sound 21NLW4100 21 inch 4 ohm loudspeaker driver similar driver
71%
Similarity
Eighteen Sound
21NLW4100
21"
Xmax15.2mm+9%
Qts0.4+18%
BL22.8Tm-4%
Vas219L-19%
Qes0.42+14%
Eighteen Sound 21LW2600 21 inch 4 ohm loudspeaker driver similar driver
70%
Similarity
Eighteen Sound
21LW2600
21"
Xmax14.6mm+4%
Qts0.29-15%
BL24.9Tm+5%
Vas332L+22%
Qes0.29-22%
Eighteen Sound 21NLW5300 21 inch 8 ohm loudspeaker driver similar driver
67%
Similarity
Eighteen Sound
21NLW5300
21"
Xmax15.3mm+9%
Qts0.32-6%
BL31Tm+30%
Vas325L+19%
Qes0.34-8%
RCF LF21X451 21 inch 8 ohm loudspeaker driver similar driver
67%
Similarity
£448.61
RCF
LF21X451
21"
Xmax14mm0%
Qts0.37+9%
BL30.5Tm+28%
Vas385L+42%
Qes0.39+5%