Hornresp
.txt · Hornresp driver database
Driver file ready to place in Hornresp’s Drivers folder.
Download for HornrespB&C 21SW115 4Ω
LF DriverMedia
Auto-advancing
Overview
LF Driver21SW series
B&C
B&C 21SW115
B&C 21SW115 is a 21" 4 ohm LF driver rated at 1700W RMS. The validated T/S data includes Fs 33Hz, Qts 0.36, Vas 278L, Xmax 14mm, sensitivity 96.3dB, plus 2352cm³ Vd and 89 EBP. bits tracks UK vendor pricing, price movement, datasheet links, simulator import data, and similar drivers, with a current best price of £481.99.
Size
21"
Impedance
4Ω
RMS Power
1700W
Sensitivity
96.3dB
EBP
89
Either alignment
Vd
2352cm³
Frequency response
Manufacturer-provided response plots and related charts.
T/S Parameters
Valid
Fs33Hz
Qts0.36
Qes0.37
Qms7.7
Vas278.0L
Re3.6Ω
Le1.70mH
BL24.8Tm
Sd1680cm²
Mms335g
Xmax14.0mm
SPL96dB
Power1700W
Power Nominal1700W
Impedance4Ω
Min Impedance4.2Ω
F Low33Hz
F High1000Hz
Voice Coil116mm
Flux Density1.15T
Pricing & availability
Price definitionsPrice movement
Other offers
2 vendorsjpleisure
Updated 7 Aug 2026· 4Ω
Source: ex VAT · 20%
£491.16
inc VAT
In stock
jpleisure
Updated 11 Sept 2026· 4Ω
Source: ex VAT · 20%
£491.16
inc VAT
In stock
Best current price
Updated 11 Sept 2026
bluearan
£481.99
Avg £488.10£6.11 below avg (-1.3%)
inc VAT·2 in stock
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.
WinISD
.wdr · WinISD driver editor
Native WinISD driver record with the required SI conversions.
Download for WinISDBASTA!
.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 VituixCAD00 Simulator
Direct import · Web app
Start a new enclosure simulation with this driver already loaded.
Open in 00 SimulatorCopy spec sheet
Plain text · Clipboard
Copy the available values as a clean label-and-value list.
Dimensions & Physical
Weight14.0kg
Diameter547.0mm
Overall Depth249.0mm
Cutout Diameter503.0mm
Bolt Circle Diameter527.0mm
Additional Manufacturer Specs
Bl24.8 Tm
Fs33 Hz
Le1.7 mH
Re3.6 Ω
Sd1680 cm² (260.4 in²)
Ebp89 Hz
Mms335 g
Qes0.37
Qms7.7
Qts0.36
Vas278 dm³ (9.7 ft³)
η02.6 %
ConeRCK21SW1154
Xmax14 mm
Xvar15 mm
SpiderDouble Silicone
Cone ShapeRadial
Pole DesignT-Pole
Winding Depth34 mm (1.34 in)
Surround ShapeTriple Roll
Former MaterialGlass Fibre
Magnet MaterialNeodymium Inside Slug
Nominal Diameter530 mm (21 in)
Winding MaterialCopper
Magnetic Gap Depth14 mm (0.55 in)
Recommended Tuning32 Hz
Bolt Circle Diameter527 mm (20.7 in)
Recommended Enclosure250 dm³ (8.83 ft³)
Woofer Cone TreatmentTWP Waterproof Both Sides
Baffle Cutout Diameter503 mm (19.8 in)
Flange And Gasket Thickness14 mm (0.53 in)
Air Volume Occupied By Driver15 dm³ (0.53 ft³)
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.
Reference
B&C
21SW115
21"
Best current price
£481.99
Compare on
Matches sit inside every range. Size stays fixed automatically.
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.
53%
Similarity
60% cheaper£192.29
Dayton Audio
PSS555-8
21"
Lower price
Xmax11mm-21%
Qts0.33-8%
BL29.7Tm+20%
Vas444L+60%
Qes0.34-8%
74%
Similarity
29% cheaper£343.60
SB Audience
NERO-21SW1100D
21"
Lower price
Xmax12.2mm-13%
Qts0.34-6%
BL30Tm+21%
Vas312.6L+12%
Qes0.35-5%
74%
Similarity
19% cheaper£389.00
RCF
LF21X451
21"
Lower price
Xmax14mm0%
Qts0.37+3%
BL30.5Tm+23%
Vas385L+38%
Qes0.39+5%
57%
Similarity
11% cheaper£428.34
BishopSound
BWN21/4
21"
Lower price
Xmax15mm+7%
Qts0.42+16%
BL32.6Tm+31%
Vas244.2L-12%
Qes0.46+23%
57%
Similarity
11% cheaper£428.34
BishopSound
BWN21/8
21"
Lower price
Xmax15mm+7%
Qts0.42+16%
BL32.6Tm+31%
Vas244.2L-12%
Qes0.46+23%
82%
Similarity
£481.99
B&C
21SW115
21"
Xmax14mm0%
Qts0.37+3%
BL30.1Tm+21%
Vas318L+14%
Qes0.39+5%
68%
Similarity
2% more£492.21
Eighteen Sound
21LW2600
21"
Higher price
Xmax14.6mm+4%
Qts0.33-8%
BL32.5Tm+31%
Vas333L+20%
Qes0.34-8%
Image unavailable
86%
Similarity
18% more£569.00
Precision Devices
PD.2155-1N
21"
Higher price
Xmax14mm0%
Qts0.360%
BL30Tm+21%
Vas241L-13%
Qes0.37+1%
56%
Similarity
21% more£585.00
B&C
21SW152
21"
Higher price
Xmax15mm+7%
Qts0.3-17%
BL32.5Tm+31%
Vas200L-28%
Qes0.31-16%
70%
Similarity
23% more£595.00
Eighteen Sound
21NTLW5000
21"
Higher price
Xmax17.5mm+25%
Qts0.360%
BL32Tm+29%
Vas270L-3%
Qes0.38+3%
50%
Similarity
45% more£699.33
Eighteen Sound
21NLW9601C
21"
Higher price
Xmax14mm0%
Qts0.29-19%
BL33.2Tm+34%
Vas140L-50%
Qes0.31-16%
86%
Similarity
Fane
COLOSSUS PRIME 21NDXL
21"
Xmax14mm0%
Qts0.360%
BL30Tm+21%
Vas241L-13%
Qes0.37+1%