Dayton AudioPSS555-8
£194.48 · 65% less, betterFs28 Hz −16%, better
Qts0.33 −8%
Vas444 L +84%, worse
BL29.7 T·m –
Xmax11 mm −21%, worse
Sensitivity96.4 dB +0.7
No product photo
21-inch LF driver · PD series · 139 mm voice coil · 1,500 W
Precision Devices PD.2155-1N 8Ω
8 Ω · 30–300 Hz
£555.00
9.6%Thomann · In stock · All 2 offers
- Fs
- 33Hz
- Xmax
- 14mm
- SPL
- 96dB
- Pe
- 1500W
- BL
- 30T·m
- Vd
- 2128cm³
- Qts
- 0.36
- Vas
- 241L
Precision Devices PD.2155-1N is a 21-inch 8 ohm LF driver rated at 1500 W RMS. The validated T/S data includes Fs 33 Hz, Qts 0.36, Vas 241 L, Xmax 14 mm, sensitivity 95.7 dB, plus 2128 cm³ Vd and 88 EBP. bits tracks UK, EU and US shop prices, price movement, datasheet links, simulator import data, and similar drivers, with a current best price of £555.00.
The published T/S values agree with each other
Thiele/Small
- Fs
- 33Hz
- Qts
- 0.36
- Qes
- 0.37
- Qms
- 9.8
- Vas
- 241L
- Re
- 5.1Ω
- Le
- 2.40mH
Motor and cone
- BL
- 30T·m
- Sd
- 1520cm²
- Mms
- 320g
- Xmax
- 14mm
- Vd †
- 2128cm³
- Voice coil
- 139mm
- Flux density
- 1.45T
Power and response
- Sensitivity †
- 95.7dB
- Manufacturer sensitivity
- 98dB
- Power
- 1500W
- Impedance
- 8Ω
- Range
- 30–300Hz
- EBP †
- 88 · Sealed or vented
Size and mounting
- Diameter
- 550mm
- Cutout
- 492mm
- Bolt circle
- 528mm
- Depth
- 211mm
- Weight
- 15.2kg
Other published values
- Cms
- 0.07mm/N
- Power Peak
- 6000
Sensitivity shows 95.7 dB, calculated from the T/S values. Precision Devices publishes 98.0 dB, 2.3 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Precision Devices lists
LF · Primary · 21″
- BL
- 30T·m
- Fs
- 33Hz
- Le
- 2.40mH
- Re
- 5.1Ω
- Sd
- 1520cm²
- Cms
- 0.07mm/N
- Mms
- 320g
- Qes
- 0.37
- Qms
- 9.8
- Qts
- 0.36
- SPL
- 95.7dB
- Vas
- 241L
- Xmax
- 14mm
- Power
- 1500W
- Impedance
- 8Ω
- Power Peak
- 6000
- Flux density
- 1.45T
- Sensitivity
- 98dB
- Low limit
- 30Hz
- Calculated sensitivity †
- 95.7dB
- High limit
- 300Hz
- Manufacturer sensitivity
- 98dB
- Voice coil
- 139mm
- Weight
- 15.2kg
- Diameter
- 550mm
- Depth
- 211mm
- Cutout
- 492mm
- Bolt circle
- 528mm
02
Compare
Same-size drivers, compared with the PD.2155-1N. Clear differences are green when better and red when worse.
No photo
This driverPD.2155-1N
Best price
£555.00
Fs
33 Hz
Qts
0.36
Vas
241 L
BL
30 T·m
Xmax
14 mm
Sensitivity
95.7 dB
Power
1500 W
SB AudienceNERO-21SW1100D
£343.60 · 38% less, betterFs32 Hz −3%
Qts0.34 −6%
Vas312.6 L +30%, worse
BL30 T·m –
Xmax12.2 mm −13%, worse
Sensitivity96.7 dB +1
SB AudienceROSSO-21SW800
£418.61 · 25% less, betterFs38 Hz +15%, worse
Qts0.76 +111%, worse
Vas224.4 L −7%
BL24.1 T·m −20%, worse
Xmax11.4 mm −18%, worse
Sensitivity93.9 dB −1.8
Eighteen Sound21LW2600
£425.60 · 23% less, betterFs27 Hz −18%, better
Qts0.33 −8%
Vas333 L +38%, worse
BL32.5 T·m +8%
Xmax14.6 mm +4%
Sensitivity94.9 dB −0.8
CelestionTSQ2145
£445.00 · 20% less, betterFs30 Hz −9%
Qts0.34 −4%
Vas253.8 L +5%
BL33.8 T·m +13%, better
Xmax15 mm +7%
Sensitivity94.8 dB −0.9
RCFLF21X451
£448.61 · 19% less, betterFs28 Hz −15%, better
Qts0.37 –
Vas385 L +60%, worse
BL30.5 T·m –
Xmax14 mm –
Sensitivity95.4 dB –
Eighteen Sound21NLW4100
£456.79 · 18% less, betterFs36 Hz +9%
Qts0.46 +28%, worse
Vas210 L −13%, better
BL29.4 T·m –
Xmax15.2 mm +9%
Sensitivity95 dB −0.7
B&C21SW115
£458.85 · 17% less, betterFs30 Hz −9%
Qts0.37 –
Vas318 L +32%, worse
BL30.1 T·m –
Xmax14 mm –
Sensitivity95.5 dB –
Beyma21LEX1600ND
£475.00 · 14% less, betterFs30 Hz −9%
Qts0.29 −19%, better
Vas305 L +27%, worse
BL36.6 T·m +22%, better
Xmax14 mm –
Sensitivity96.4 dB +0.7
RCFLF21N451
£475.00 · 14% less, betterFs30 Hz −9%
Qts0.26 −28%, better
Vas375 L +56%, worse
BL34.5 T·m +15%, better
Xmax13 mm −7%
Sensitivity97.8 dB +2.1, better
Beyma21QLEX1600FE
£493.97 · 11% less, betterFs30 Hz −9%
Qts0.28 −22%, better
Vas309 L +28%, worse
BL36.4 T·m +21%, better
Xmax13 mm −7%
Sensitivity96.5 dB +0.8
B&C21SW152
£537.55 · 3% lessFs32 Hz −3%
Qts0.36 –
Vas200 L −17%, better
BL39 T·m +30%, better
Xmax15 mm +7%
Sensitivity94.4 dB −1.3
Eighteen Sound21NLW9001
£549.89 · Same priceFs32 Hz −3%
Qts0.31 −14%, better
Vas244 L –
BL37 T·m +23%, better
Xmax14 mm –
Sensitivity95.7 dB –
Eighteen Sound21NTLW5000
£595.00 · 7% more, worseFs31 Hz −6%
Qts0.36 –
Vas270 L +12%, worse
BL32 T·m +7%
Xmax17.5 mm +25%, better
Sensitivity95.3 dB –
Eighteen Sound21NLW4000
£608.33 · 10% more, worseFs29 Hz −12%, better
Qts0.37 –
Vas305 L +27%, worse
BL30 T·m –
Xmax15 mm +7%
Sensitivity94.9 dB −0.8
Eighteen Sound21NLW9601
£623.80 · 12% more, worseFs37 Hz +12%, worse
Qts0.29 −19%, better
Vas175 L −27%, better
BL43 T·m +43%, better
Xmax14 mm –
Sensitivity96.6 dB +0.9
No photo
Precision DevicesPD.2160-1N
£799.00 · 44% more, worseFs35 Hz +6%
Qts0.30 −17%, better
Vas177 L −27%, better
BL43 T·m +43%, better
Xmax16 mm +14%, better
Sensitivity95.9 dB –
EminenceNSW6021-124
£916.36 · 65% more, worseFs31 Hz −7%
Qts0.32 −11%, better
Vas224.6 L −7%
BL30.5 T·m –
Xmax21 mm +50%, better
Sensitivity95 dB −0.7
No current price
Fs33 Hz –
Qts0.36 –
Vas241 L –
BL30 T·m –
Xmax14 mm –
Sensitivity95.7 dB –
Eighteen Sound21LW2500
No current priceFs29 Hz −12%, better
Qts0.37 –
Vas305 L +27%, worse
BL30 T·m –
Xmax14 mm –
Sensitivity94.9 dB −0.8
No current price
Fs35 Hz +6%
Qts0.34 −6%
Vas266 L +10%, worse
BL31.3 T·m +4%
Xmax14 mm –
Sensitivity97.1 dB +1.4
No photo
Precision DevicesPD.2155-1F
No current priceFs35 Hz +6%
Qts0.34 −6%
Vas266 L +10%, worse
BL31.3 T·m +4%
Xmax14 mm –
Sensitivity97.1 dB +1.4
Eighteen Sound21NLW5300
No current priceFs31 Hz −6%
Qts0.32 −11%, better
Vas325 L +35%, worse
BL31 T·m +3%
Xmax15.3 mm +9%
Sensitivity96.6 dB +0.9
P.AudioSD21-125XB
No current priceFs35 Hz +6%
Qts0.38 +6%
Vas345.6 L +43%, worse
BL30.4 T·m –
Xmax11.3 mm −20%, worse
Sensitivity97.7 dB +2, better
Eighteen Sound21NLW9601C
No current priceFs38 Hz +15%, worse
Qts0.29 −19%, better
Vas140 L −42%, better
BL33.2 T·m +11%, better
Xmax14 mm –
Sensitivity96 dB –
B&C21SW150
No current priceFs29 Hz −12%, better
Qts0.26 −28%, better
Vas254 L +5%
BL32.6 T·m +9%
Xmax15 mm +7%
Sensitivity95.6 dB –
CelestionNTR21-5010JD
No current priceFs32 Hz –
Qts0.32 −11%, better
Vas276.7 L +15%, worse
BL33.9 T·m +13%, better
Xmax9 mm −36%, worse
Sensitivity96.4 dB +0.7
Sica21 S 4 PL
No current priceFs35 Hz +5%
Qts0.30 −17%, better
Vas255 L +6%
BL36.1 T·m +20%, better
Xmax5.2 mm −63%, worse
Sensitivity97.4 dB +1.7
Eighteen Sound21ID
No current priceFs38 Hz +15%, worse
Qts0.23 −36%, better
Vas143 L −41%, better
BL25.2 T·m −16%, worse
Xmax14 mm –
Sensitivity97.2 dB +1.5
Dayton AudioPSS545HE-4
No current priceFs29 Hz −13%, better
Qts0.27 −25%, better
Vas212.2 L −12%, better
BL35.5 T·m +18%, better
Xmax21 mm +50%, better
Sensitivity94.6 dB −1.1
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Thomann4.0 out of 51 rating · Checked 26 Oct 2026Read reviews on Thomann
Each shop collects its own ratings. Bits shows them as published and doesn't verify them.
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Thomann | £555.00, the lowest price | In stock | Visit shop at Thomann | |
Blue Aran 7-9 weeks | £613.97 | 11% above the lowest price | Usually available in 7-9 weeks | Visit shop at Blue Aran |
Best price over time
Tracked since 1 Apr
Recent changes
- 14 OctThomann£569.00 → £555.00Down 2.5% from £569.00
- 16 SepBlue Aran£582.00 → £613.97Up 5.5% from £582.00
- 4 SepThomann£568.00 → £569.00Up 0.2% from £568.00