Hornresp
.txt · Hornresp driver database
Driver file ready to place in Hornresp’s Drivers folder.
Download for HornrespB&C 21SW115 8Ω
LF DriverMedia
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Overview
LF Driver21SW series
B&C
B&C 21SW115
B&C 21SW115 is a 21" 8 ohm LF driver rated at 1700W RMS. The validated T/S data includes Fs 30Hz, Qts 0.37, Vas 318L, Xmax 14mm, sensitivity 95.5dB, plus 2352cm³ Vd and 77 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
8Ω
RMS Power
1700W
Sensitivity
95.5dB
97.0dBmanufacturer; using T/S-derived value (1.5dB delta).
EBP
77
Either alignment
Vd
2352cm³
Frequency response
Manufacturer-provided response plots and related charts.
T/S Parameters
Valid
Fs30Hz
Qts0.37
Qes0.39
Qms10.9
Vas318.0L
Re5.4Ω
Le2.10mH
BL30.1Tm
Sd1680cm²
Mms342g
Xmax14.0mm
SPL96dB
Power1700W
Power Nominal1700W
Impedance8Ω
Min Impedance6.2Ω
F Low30Hz
F High1000Hz
Voice Coil116mm
Flux Density1.15T
Pricing & availability
Price definitionsPrice movement
Other offers
2 vendorsjpleisure
Updated 7 Aug 2026· 8Ω
Source: ex VAT · 20%
£491.16
inc VAT
In stock
jpleisure
Updated 11 Sept 2026· 8Ω
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
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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
Bl30.1 Tm
Fs30 Hz
Le2.1 mH
Re5.4 Ω
Sd1680 cm² (260.4 in²)
Ebp77 Hz
Mms342 g
Qes0.39
Qms10.9
Qts0.37
Vas318 dm³ (11.23 ft³)
η02.2 %
ConeRCK21SW1158
Xmax14 mm
Xvar16 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.
64%
Similarity
60% cheaper£192.29
Dayton Audio
PSS555-8
21"
Lower price
Xmax11mm-21%
Qts0.33-11%
BL29.7Tm-1%
Vas444L+40%
Qes0.34-13%
83%
Similarity
29% cheaper£343.60
SB Audience
NERO-21SW1100D
21"
Lower price
Xmax12.2mm-13%
Qts0.34-8%
BL30Tm0%
Vas312.6L-2%
Qes0.35-10%
58%
Similarity
21% cheaper£380.00
Eighteen Sound
21NLW4100
21"
Lower price
Xmax15.2mm+9%
Qts0.46+24%
BL29.4Tm-2%
Vas210L-34%
Qes0.49+26%
94%
Similarity
19% cheaper£389.00
RCF
LF21X451
21"
Lower price
Xmax14mm0%
Qts0.370%
BL30.5Tm+1%
Vas385L+21%
Qes0.390%
44%
Similarity
17% cheaper£399.00
Lavoce
SAN214.50
21"
Lower price
Xmax15.4mm+10%
Qts0.28-24%
BL39.6Tm+32%
Vas218.3L-31%
Qes0.29-26%
59%
Similarity
12% cheaper£425.00
Beyma
21QLEX1600FE
21"
Lower price
Xmax13mm-7%
Qts0.28-24%
BL36.4Tm+21%
Vas309L-3%
Qes0.3-23%
70%
Similarity
11% cheaper£428.34
BishopSound
BWN21/4
21"
Lower price
Xmax15mm+7%
Qts0.42+13%
BL32.6Tm+8%
Vas244.2L-23%
Qes0.46+17%
70%
Similarity
11% cheaper£428.34
BishopSound
BWN21/8
21"
Lower price
Xmax15mm+7%
Qts0.42+13%
BL32.6Tm+8%
Vas244.2L-23%
Qes0.46+17%
77%
Similarity
8% cheaper£445.00
Celestion
TSQ2145
21"
Lower price
Xmax15mm+7%
Qts0.34-7%
BL33.8Tm+12%
Vas253.8L-20%
Qes0.36-8%
84%
Similarity
£481.99
B&C
21SW115
21"
Xmax14mm0%
Qts0.36-3%
BL24.8Tm-18%
Vas278L-13%
Qes0.37-5%
80%
Similarity
2% more£492.21
Eighteen Sound
21LW2600
21"
Higher price
Xmax14.6mm+4%
Qts0.33-11%
BL32.5Tm+8%
Vas333L+5%
Qes0.34-13%
Image unavailable
90%
Similarity
18% more£569.00
Precision Devices
PD.2155-1N
21"
Higher price
Xmax14mm0%
Qts0.36-3%
BL30Tm0%
Vas241L-24%
Qes0.37-4%