Dayton AudioPSS555-8
£196.66Fs28 Hz −20%, better
Qts0.33 +10%, worse
Vas444 L +74%, worse
BL29.7 T·m −18%, worse
Xmax11 mm +112%, better
Sensitivity96.4 dB −1
21-inch LF driver · 100 mm voice coil · 1,200 W
Sica 21 S 4 PL 8Ω
8 Ω
No current price
- Fs
- 35Hz
- Xmax
- 5.2mm
- SPL
- 97dB
- Pe
- 1200W
- BL
- 36.1T·m
- Vd
- 864cm³
- Qts
- 0.30
- Vas
- 255L
Sica 21 S 4 PL is a 21-inch 8 ohm LF driver rated at 1200 W RMS. The validated T/S data includes Fs 35 Hz, Qts 0.30, Vas 255 L, Xmax 5.2 mm, sensitivity 97.4 dB, plus 864 cm³ Vd and 112 EBP. bits tracks vendor pricing, datasheet links, simulator import data, and similar drivers from the same loudspeaker database.
The published T/S values agree with each other
Thiele/Small
- Fs
- 35Hz
- Qts
- 0.30
- Qes
- 0.31
- Qms
- 9.9
- Vas
- 255L
- Re
- 5.7Ω
- Le
- 1.60mH
Motor and cone
- BL
- 36.1T·m
- Sd
- 1662cm²
- Mms
- 325g
- Xmax
- 5.2mm
- Vd †
- 864cm³
- Voice coil
- 100mm
- Flux density
- 0.89T
Power and response
- Sensitivity †
- 97.4dB
- Manufacturer sensitivity
- 98.8dB
- Power
- 1200W
- Impedance
- 8Ω
- EBP †
- 112 · Leans vented
Size and mounting
- Diameter
- 545mm
- Cutout
- 497mm
- Bolt circle
- 520mm
- Depth
- 249mm
- Weight
- 10.5kg
Other published values
- Cms
- 0.065mm/N
- Power Program
- 2400
Sensitivity shows 97.4 dB, calculated from the T/S values. Sica publishes 98.8 dB, 1.4 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Sica lists
LF · Primary · 21″
- BL
- 36.1T·m
- Fs
- 35Hz
- Le
- 1.60mH
- Re
- 5.7Ω
- Sd
- 1662cm²
- Cms
- 0.065mm/N
- Mms
- 325g
- Qes
- 0.31
- Qms
- 9.9
- Qts
- 0.30
- SPL
- 97.4dB
- Vas
- 255L
- Xmax
- 5.2mm
- Power
- 1200W
- Impedance
- 8Ω
- Flux density
- 0.89T
- Sensitivity
- 98.8dB
- Power Program
- 2400
- Calculated sensitivity †
- 97.4dB
- Manufacturer sensitivity
- 98.8dB
- Voice coil
- 100mm
- Weight
- 10.5kg
- Diameter
- 545mm
- Depth
- 249mm
- Cutout
- 497mm
- Bolt circle
- 520mm
02
Compare
Same-size drivers, compared with the 21 S 4 PL. Clear differences are green when better and red when worse.
This driver21 S 4 PL
Best price
–
Fs
35 Hz
Qts
0.30
Vas
255 L
BL
36.1 T·m
Xmax
5.2 mm
Sensitivity
97.4 dB
Power
1200 W
SB AudienceNERO-21SW1100D
£343.60Fs32 Hz −8%
Qts0.34 +13%, worse
Vas312.6 L +23%, worse
BL30 T·m −17%, worse
Xmax12.2 mm +135%, better
Sensitivity96.7 dB −0.7
Beyma21QLEX1600FE
£425.00Fs30 Hz −13%, better
Qts0.28 −7%
Vas309 L +21%, worse
BL36.4 T·m –
Xmax13 mm +150%, better
Sensitivity96.5 dB −0.9
Eighteen Sound21LW2600
£430.84Fs27 Hz −22%, better
Qts0.33 +10%, worse
Vas333 L +31%, worse
BL32.5 T·m −10%
Xmax14.6 mm +181%, better
Sensitivity94.9 dB −2.5, worse
CelestionTSQ2145
£445.00Fs30 Hz −13%, better
Qts0.34 +15%, worse
Vas253.8 L –
BL33.8 T·m −6%
Xmax15 mm +188%, better
Sensitivity94.8 dB −2.6, worse
Dayton AudioHTS545HE-4
£453.84Fs26 Hz −24%, better
Qts0.28 −7%
Vas179 L −30%, better
BL38.2 T·m +6%
Xmax21 mm +304%, better
Sensitivity92.5 dB −4.9, worse
Beyma21LEX1600ND
£475.00Fs30 Hz −13%, better
Qts0.29 −3%
Vas305 L +20%, worse
BL36.6 T·m –
Xmax14 mm +169%, better
Sensitivity96.4 dB −1
RCFLF21N451
£475.00Fs30 Hz −13%, better
Qts0.26 −13%, better
Vas375 L +47%, worse
BL34.5 T·m −4%
Xmax13 mm +150%, better
Sensitivity97.8 dB –
B&C21DS115
£481.44Fs34 Hz –
Qts0.27 −10%
Vas204 L −20%, better
BL39.3 T·m +9%
Xmax16.5 mm +217%, better
Sensitivity96.6 dB −0.8
LavoceSAN214.50
£482.29Fs33 Hz −5%
Qts0.28 −7%
Vas218.3 L −14%, better
BL39.6 T·m +10%
Xmax15.4 mm +196%, better
Sensitivity96.4 dB −1
B&C21SW152
£544.16Fs32 Hz −8%
Qts0.36 +20%, worse
Vas200 L −22%, better
BL39 T·m +8%
Xmax15 mm +188%, better
Sensitivity94.4 dB −3, worse
Eighteen Sound21LW1400
£550.42Fs28 Hz −19%, better
Qts0.24 −20%, better
Vas385 L +51%, worse
BL33.5 T·m −7%
Xmax9.5 mm +83%, better
Sensitivity97.5 dB –
Eighteen Sound21NLW9001
£556.65Fs32 Hz −8%
Qts0.31 +3%
Vas244 L −4%
BL37 T·m –
Xmax14 mm +169%, better
Sensitivity95.7 dB −1.7
Eighteen Sound21NTLW5000
£595.00Fs31 Hz −10%, better
Qts0.36 +20%, worse
Vas270 L +6%
BL32 T·m −11%, worse
Xmax17.5 mm +237%, better
Sensitivity95.3 dB −2.1, worse
Eighteen Sound21NLW9601
£631.46Fs37 Hz +7%
Qts0.29 −3%
Vas175 L −31%, better
BL43 T·m +19%, better
Xmax14 mm +169%, better
Sensitivity96.6 dB −0.8
EminenceNSW6021-6
£800.00Fs29 Hz −16%, better
Qts0.31 +3%
Vas224.6 L −12%, better
BL33.8 T·m −6%
Xmax21 mm +304%, better
Sensitivity94.5 dB −2.9, worse
No photo
Precision DevicesPD.2160-1N
£811.00Fs35 Hz –
Qts0.30 –
Vas177 L −31%, better
BL43 T·m +19%, better
Xmax16 mm +208%, better
Sensitivity95.9 dB −1.5
FaitalPRO21XL3000
£899.00Fs30 Hz −13%, better
Qts0.25 −17%, better
Vas284.6 L +12%, worse
BL43 T·m +19%, better
Xmax17.7 mm +240%, better
Sensitivity96.9 dB −0.5
EminenceNSW6021-124
£926.62Fs31 Hz −11%, better
Qts0.32 +7%
Vas224.6 L −12%, better
BL30.5 T·m −16%, worse
Xmax21 mm +304%, better
Sensitivity95 dB −2.4, worse
CelestionNTR21-5010JD
No current priceFs32 Hz −7%
Qts0.32 +7%
Vas276.7 L +9%
BL33.9 T·m −6%
Xmax9 mm +73%, better
Sensitivity96.4 dB −1
Dayton AudioPSS545HE-4
No current priceFs29 Hz −17%, better
Qts0.27 −10%
Vas212.2 L −17%, better
BL35.5 T·m –
Xmax21 mm +304%, better
Sensitivity94.6 dB −2.8, worse
Eighteen Sound21NLW9601C
No current priceFs38 Hz +10%
Qts0.29 −3%
Vas140 L −45%, better
BL33.2 T·m −8%
Xmax14 mm +169%, better
Sensitivity96 dB −1.4
No current price
Fs35 Hz –
Qts0.34 +13%, worse
Vas266 L +4%
BL31.3 T·m −13%, worse
Xmax14 mm +169%, better
Sensitivity97.1 dB –
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz –
Qts0.34 +13%, worse
Vas266 L +4%
BL31.3 T·m −13%, worse
Xmax14 mm +169%, better
Sensitivity97.1 dB –
Eighteen Sound21NLW5300
No current priceFs31 Hz −10%, better
Qts0.32 +7%
Vas325 L +27%, worse
BL31 T·m −14%, worse
Xmax15.3 mm +194%, better
Sensitivity96.6 dB −0.8
CelestionTSQ2160
No current priceFs30 Hz −13%, better
Qts0.26 −14%, better
Vas234.8 L −8%
BL43.1 T·m +20%, better
Xmax18.8 mm +261%, better
Sensitivity95.8 dB −1.6
No current price
Fs33 Hz −5%
Qts0.36 +20%, worse
Vas241 L −5%
BL30 T·m −17%, worse
Xmax14 mm +169%, better
Sensitivity95.7 dB −1.7
No photo
Precision DevicesPD.2155-1N
No current priceFs33 Hz −5%
Qts0.36 +20%, worse
Vas241 L −5%
BL30 T·m −17%, worse
Xmax14 mm +169%, better
Sensitivity95.7 dB −1.7
BishopSoundBWN21/4
No current priceFs29 Hz −16%, better
Qts0.42 +39%, worse
Vas244.2 L −4%
BL32.6 T·m −10%
Xmax15 mm +188%, better
Sensitivity93.2 dB −4.2, worse
BishopSoundBWN21/8
No current priceFs29 Hz −16%, better
Qts0.42 +39%, worse
Vas244.2 L −4%
BL32.6 T·m −10%
Xmax15 mm +188%, better
Sensitivity93.2 dB −4.2, worse
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
No current price found. Pricing may appear after the next vendor refresh.