REDCATT5FHW
£15.86Fs50 Hz +22%, worse
Qts0.35 −5%
Vas6.5 L +15%, worse
BL6.5 T·m −5%
Xmax3.2 mm −64%, worse
Sensitivity85.4 dB +3.6, better
4-inch LF driver · PTT series · 30 mm voice coil · 60 W
Purifi PTT4.0X08-NFC-01 8Ω
8 Ω
No price for delivery to the UK
- Fs
- 41Hz
- Xmax
- 8.8mm
- SPL
- 82dB
- Pe
- 60W
- BL
- 6.9T·m
- Vd
- 50cm³
- Qts
- 0.37
- Vas
- 6L
Purifi PTT4.0X08-NFC-01 is a 4-inch 8 ohm LF driver rated at 60 W RMS. The validated T/S data includes Fs 41 Hz, Qts 0.37, Vas 5.7 L, Xmax 8.8 mm, sensitivity 81.8 dB, plus 50 cm³ Vd and 100 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
- 41Hz
- Qts
- 0.37
- Qes
- 0.41
- Qms
- 4.2
- Vas
- 5.7L
- Re
- 6.4Ω
- Le
- 0.51mH
Motor and cone
- BL
- 6.9T·m
- Sd
- 57cm²
- Mms
- 12g
- Xmax
- 8.8mm
- Vd †
- 50cm³
- Voice coil
- 30mm
Power and response
- Sensitivity †
- 81.8dB
- Manufacturer sensitivity
- 82dB
- Power
- 60W
- Impedance
- 8Ω
- Min. impedance
- 7.1Ω
- EBP †
- 100 · Sealed or vented
Size and mounting
- Diameter
- 125mm
- Cutout
- 101mm
- Bolt circle
- 115mm
- Weight
- 1.3kg
Other published values
- Cms
- 1.25mm/N
- Rms
- 0.73kg/s
- Xmech
- 13.7
- Power Peak
- 200
Other dimensions
- Mounting Depth
- 73.5
† Calculated by bits from the published values
What this validation status means
Everything else Purifi lists
LF · Primary · 4″
- BL
- 6.9T·m
- Fs
- 41Hz
- Le
- 0.51mH
- Re
- 6.4Ω
- Sd
- 57cm²
- Cms
- 1.25mm/N
- Mms
- 12g
- Qes
- 0.41
- Qms
- 4.2
- Qts
- 0.37
- Rms
- 0.73kg/s
- SPL
- 81.8dB
- Vas
- 5.7L
- Xmax
- 8.8mm
- Xmech
- 13.7
- Power
- 60W
- Impedance
- 8Ω
- Power Peak
- 200
- Sensitivity
- 82dB
- Calculated sensitivity †
- 81.8dB
- Manufacturer sensitivity
- 82dB
- Min. impedance
- 7.1Ω
- Voice coil
- 30mm
- Weight
- 1.3kg
- Diameter
- 125mm
- Mounting Depth
- 73.5
- Cutout
- 101mm
- Bolt circle
- 115mm
02
Compare
Same-size drivers, compared with the PTT4.0X08-NFC-01. Clear differences are green when better and red when worse.
This driverPTT4.0X08-NFC-01
Best price
–
Fs
41 Hz
Qts
0.37
Vas
5.7 L
BL
6.9 T·m
Xmax
8.8 mm
Sensitivity
81.8 dB
Power
60 W
CIAREHW131
£30.98Fs68 Hz +66%, worse
Qts0.39 +5%
Vas5.6 L –
BL7.0 T·m –
Xmax4.4 mm −50%, worse
Sensitivity87.9 dB +6.1, better
MonacorSP-100/8
£31.15Fs61 Hz +49%, worse
Qts0.37 –
Vas4.7 L −18%, better
BL5.5 T·m −20%, worse
Xmax2.5 mm −72%, worse
Sensitivity85.9 dB +4.1, better
Dayton AudioRS125-8
£37.39Fs59 Hz +44%, worse
Qts0.34 −8%
Vas4.8 L −16%, better
BL5.7 T·m −18%, worse
Xmax4 mm −55%, worse
Sensitivity85.8 dB +4, better
CIAREPWA5.38
£37.58Fs78 Hz +90%, worse
Qts0.37 –
Vas4.5 L −21%, better
BL8.9 T·m +29%, better
Xmax3.9 mm −56%, worse
Sensitivity89.2 dB +7.4, better
SB AcousticsSB12NRX25-8
£51.87Fs57 Hz +39%, worse
Qts0.37 –
Vas5.3 L −7%
BL5.4 T·m −22%, worse
Xmax5 mm −43%, worse
Sensitivity85.8 dB +4, better
SB AcousticsSB12MNRX25-4
£52.29Fs58 Hz +41%, worse
Qts0.37 –
Vas5.5 L −4%
BL3.7 T·m −46%, worse
Xmax2.3 mm −74%, worse
Sensitivity86.1 dB +4.3, better
Tang BandW4-1320SIF
£57.77Fs75 Hz +83%, worse
Qts0.36 –
Vas5.2 L −8%
BL5.3 T·m −23%, worse
Xmax3 mm −66%, worse
Sensitivity89.2 dB +7.4, better
SB AcousticsSB12CACS25-8
£58.31Fs51 Hz +24%, worse
Qts0.37 –
Vas6.5 L +14%, worse
BL5.2 T·m −25%, worse
Xmax5 mm −43%, worse
Sensitivity85.4 dB +3.6, better
Sica5 NR 1.5 PL
£63.80Fs61 Hz +49%, worse
Qts0.35 −5%
Vas7.4 L +30%, worse
BL6.7 T·m −4%
Xmax3.5 mm −60%, worse
Sensitivity88.4 dB +6.6, better
Tang BandW4-1337SDF
£71.17Fs70 Hz +71%, worse
Qts0.34 −8%
Vas5.6 L –
BL5.3 T·m −23%, worse
Xmax2.5 mm −72%, worse
Sensitivity88.9 dB +7.1, better
VisatonW 130 X
£76.74Fs40 Hz –
Qts0.37 –
Vas5.6 L –
BL13.2 T·m +91%, better
Xmax5.8 mm −34%, worse
Sensitivity81.5 dB –
MarkaudioALPAIR 11 MS
£90.00Fs44 Hz +7%
Qts0.34 −7%
Vas17.7 L +211%, worse
BL7.8 T·m +13%, better
Xmax8 mm −9%
Sensitivity87.6 dB +5.8, better
PurifiPTT4.0X08-NAC-03
£251.15Fs43 Hz +5%
Qts0.39 +5%
Vas5.3 L −7%
BL7 T·m –
Xmax8.8 mm –
Sensitivity81.9 dB –
PurifiPTT4.0X04-NFC-01
£251.15Fs38 Hz −7%
Qts0.30 −19%, better
Vas6.4 L +12%, worse
BL6 T·m −13%, worse
Xmax8.8 mm –
Sensitivity82.4 dB +0.6
£334.88
Fs45 Hz +10%
Qts0.36 –
Vas6 L +5%
BL5.4 T·m −22%, worse
Xmax3 mm −66%, worse
Sensitivity83.2 dB +1.4
£375.54
Fs39 Hz −5%
Qts0.35 −5%
Vas14 L +146%, worse
BL7.3 T·m +6%
Xmax7 mm −20%, worse
Sensitivity85.1 dB +3.3, better
£376.75
Fs48 Hz +17%, worse
Qts0.38 –
Vas4.6 L −19%, better
BL5.9 T·m −14%, worse
Xmax3 mm −66%, worse
Sensitivity83 dB +1.2
PurifiPTT4.0X04-NAC-03
No current priceFs40 Hz –
Qts0.31 −16%, better
Vas5.5 L −4%
BL6.1 T·m −12%, worse
Xmax8.8 mm –
Sensitivity82.2 dB –
Tang BandW4-992SD
No current priceFs55 Hz +34%, worse
Qts0.35 −5%
Vas5.7 L –
BL6.4 T·m −7%
Xmax3.5 mm −60%, worse
Sensitivity85.8 dB +4, better
No photo
PHL Audio973ND
No current priceFs67 Hz +63%, worse
Qts0.39 +5%
Vas6.3 L +11%, worse
BL7.7 T·m +12%, better
Xmax6.5 mm −26%, worse
Sensitivity88.5 dB +6.7, better
No photo
PHL Audio973
No current priceFs67 Hz +63%, worse
Qts0.40 +8%
Vas6.3 L +11%, worse
BL7.6 T·m +10%, better
Xmax6.5 mm −26%, worse
Sensitivity88.4 dB +6.6, better
Beyma5CX200FE
No current priceFs82 Hz +100%, worse
Qts0.41 +11%, worse
Vas5.3 L −7%
BL7.4 T·m +7%
Xmax5.7 mm −35%, worse
Sensitivity90.4 dB +8.6, better
Tang BandW5-2053
No current priceFs35 Hz −15%, better
Qts0.40 +8%
Vas3.9 L −32%, better
BL8.3 T·m +21%, better
Xmax8 mm −9%
Sensitivity77.8 dB −4, worse
No photo
PHL Audio900
No current priceFs65 Hz +59%, worse
Qts0.37 –
Vas7.8 L +37%, worse
BL8 T·m +16%, better
Xmax6.5 mm −26%, worse
Sensitivity89.2 dB +7.4, better
EminenceFS5.15A8
No current priceFs74 Hz +80%, worse
Qts0.38 –
Vas5 L −12%, better
BL8.6 T·m +25%, better
Xmax3.5 mm −60%, worse
Sensitivity89 dB +7.2, better
HiViBG5N
No current priceFs60 Hz +46%, worse
Qts0.33 −11%, better
Vas7.1 L +25%, worse
BL7.4 T·m +7%
Xmax2.5 mm −72%, worse
Sensitivity87.8 dB +6, better
CIARECW131
No current priceFs65 Hz +59%, worse
Qts0.39 +5%
Vas5.3 L −7%
BL5.7 T·m −18%, worse
Xmax4 mm −55%, worse
Sensitivity87.1 dB +5.3, better
Tang BandW4-1749S
No current priceFs60 Hz +46%, worse
Qts0.34 −8%
Vas6.3 L +11%, worse
BL5.8 T·m −16%, worse
Xmax0.9 mm −90%, worse
Sensitivity87.5 dB +5.7, better
No photo
PHL Audio900ND
No current priceFs65 Hz +59%, worse
Qts0.36 –
Vas7.8 L +37%, worse
BL8.1 T·m +17%, better
Xmax6.5 mm −26%, worse
Sensitivity89.3 dB +7.5, better
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports5.0 out of 52 ratings · Checked 24 Oct 2026Read reviews on SoundImports
Each shop collects its own ratings. Bits shows them as published and doesn't verify them.
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
SoundImports Import VAT and duty may apply | £251.15 | Back order | Visit shop at SoundImports |