Hornresp
.txt · Hornresp driver database
Driver file ready to place in Hornresp’s Drivers folder.
Not enough T/S data
Missing Le, Mms, RMS power
BishopSound BWN21/4 4Ω
LF DriverMedia
Auto-advancing
Overview
LF DriverBWN series
BishopSound
BishopSound BWN21/4
BishopSound BWN21/4 is a 21" 4 ohm LF driver. The validated T/S data includes Fs 29Hz, Qts 0.42, Vas 244.2L, Xmax 15mm, sensitivity 93.2dB, plus 2558cm³ Vd and 64 EBP. bits tracks UK vendor pricing, price movement, datasheet links, simulator import data, and similar drivers, with a current best price of £428.34.
Partial source evidence
Automated T/S checks passed, but some material low-frequency parameters are not published for this record.
Material fields not published: Mms
- Manufacturer page linked
- Datasheet linked
- Canonical units normalized for comparison
- Vd can be derived from Sd and Xmax
- EBP can be derived from Fs and Qes
Size
21"
Impedance
4Ω
Sensitivity
93.2dB
98.0dBmanufacturer; using T/S-derived value (4.8dB delta).
EBP
64
Either alignment
Vd
2558cm³
T/S Parameters
Valid
Fs29Hz
Qts0.42
Qes0.46
Qms5.1
Vas244.2L
Re5.1Ω
BL32.6Tm
Sd1706cm²
Xmax15.0mm
SPL93dB
Impedance4Ω
Min Impedance5.1Ω
F Low29Hz
F High1000Hz
Voice Coil127mm
Flux Density1.20T
Pricing & availability
Price definitionsPrice movement
Best current price
Updated 31 Jul 2026
bishopsound
£428.34
inc VAT·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.
Not enough T/S data
Missing Le, Mms, RMS power
BASTA!
.bastaelement · BASTA! loudspeaker simulator
Native BASTA! element file using its documented SI-unit fields.
Not enough T/S data
Missing Le, RMS power
VituixCAD
.wdr · VituixCAD 2 Enclosure
A WinISD driver file that VituixCAD imports directly.
Not enough T/S data
Missing Le, Mms, RMS power
00 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
Weight18.0kg
Diameter548.0mm
Overall Depth240.0mm
Bolt Circle Diameter525.0mm
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.
Reference
BishopSound
BWN21/4
21"
Best current price
£428.34
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.
57%
Similarity
20% cheaper£343.60
SB Audience
NERO-21SW1100D
21"
Lower price
Xmax12.2mm-19%
Qts0.34-19%
BL30Tm-8%
Vas312.6L+28%
Qes0.35-23%
81%
Similarity
11% cheaper£380.00
Eighteen Sound
21NLW4100
21"
Lower price
Xmax15.2mm+1%
Qts0.46+10%
BL29.4Tm-10%
Vas210L-14%
Qes0.49+7%
64%
Similarity
9% cheaper£389.00
RCF
LF21X451
21"
Lower price
Xmax14mm-7%
Qts0.37-11%
BL30.5Tm-6%
Vas385L+58%
Qes0.39-14%
100%
Similarity
£428.34
BishopSound
BWN21/8
21"
Xmax15mm0%
Qts0.420%
BL32.6Tm0%
Vas244.2L0%
Qes0.460%
77%
Similarity
4% more£445.00
Celestion
TSQ2145
21"
Higher price
Xmax15mm0%
Qts0.34-18%
BL33.8Tm+4%
Vas253.8L+4%
Qes0.36-21%
71%
Similarity
13% more£481.99
B&C
21SW115
21"
Higher price
Xmax14mm-7%
Qts0.37-11%
BL30.1Tm-8%
Vas318L+30%
Qes0.39-14%
64%
Similarity
13% more£481.99
B&C
21SW115
21"
Higher price
Xmax14mm-7%
Qts0.36-14%
BL24.8Tm-24%
Vas278L+14%
Qes0.37-19%
64%
Similarity
15% more£492.21
Eighteen Sound
21LW2600
21"
Higher price
Xmax14.6mm-3%
Qts0.33-21%
BL32.5Tm0%
Vas333L+36%
Qes0.34-25%
Image unavailable
76%
Similarity
33% more£569.00
Precision Devices
PD.2155-1N
21"
Higher price
Xmax14mm-7%
Qts0.36-14%
BL30Tm-8%
Vas241L-1%
Qes0.37-18%
70%
Similarity
37% more£585.00
B&C
21SW152
21"
Higher price
Xmax15mm0%
Qts0.36-14%
BL39Tm+20%
Vas200L-18%
Qes0.38-17%
71%
Similarity
39% more£595.00
Eighteen Sound
21NTLW5000
21"
Higher price
Xmax17.5mm+17%
Qts0.36-14%
BL32Tm-2%
Vas270L+11%
Qes0.38-17%
76%
Similarity
Fane
COLOSSUS PRIME 21NDXL
21"
Xmax14mm-7%
Qts0.36-14%
BL30Tm-8%
Vas241L-1%
Qes0.37-18%