GRS8FR-8
£17.54 · 88% less, betterFs45 Hz +13%, worse
Qts0.56 +24%, worse
Vas37.0 L −45%, better
BL8.5 T·m +29%, better
Xmax3 mm –
Sensitivity89.3 dB −1.2
8-inch LF driver · 40 W
Tang Band W8-2145 8Ω
8 Ω
£150.67
SteadySoundImports · 6 in stock · Ships from Netherlands · All 2 offers
- Fs
- 40Hz
- Xmax
- 3mm
- SPL
- 91dB
- Pe
- 40W
- BL
- 6.6T·m
- Vd
- 66cm³
- Qts
- 0.45
- Vas
- 68L
Manufacturer response and impedance data, with source and trace details below. The left and right arrow keys read every shown curve at a frequency, a twelfth of an octave at a time, or an octave with Shift. Escape clears the reading.
Curve provenanceInspect 2 traces
These plotted lines are Bits digitizations of manufacturer evidence, not new measurements. How provenance works
- Trace datasheet-response-trace-poc/v1
spl
Frequency response
240 plotted pointsMedium confidence1,569 selected pixels of 1,870 - Trace datasheet-response-trace-poc/v1
impedance
Impedance response
240 plotted pointsMedium confidence2,576 selected pixels of 2,576
Tang Band W8-2145 is an 8-inch 8 ohm LF driver rated at 40 W RMS. The validated T/S data includes Fs 40 Hz, Qts 0.45, Vas 67.7 L, Xmax 3 mm, sensitivity 90.5 dB, plus 66 cm³ Vd and 66 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 £150.67.
The published T/S values agree with each other
Thiele/Small
- Fs
- 40Hz
- Qts
- 0.45
- Qes
- 0.61
- Qms
- 1.6
- Vas
- 67.7L
- Re
- 6.8Ω
- Le
- 0.011mH
Motor and cone
- BL
- 6.6T·m
- Sd
- 220cm²
- Mms
- 15g
- Xmax
- 3mm
- Vd †
- 66cm³
Power and response
- Sensitivity †
- 90.5dB
- Manufacturer sensitivity
- 90dB
- Power
- 40W
- Impedance
- 8Ω
- EBP †
- 66 · Sealed or vented
Other published values
- Power Peak
- 80
† Calculated by bits from the published values
What this validation status means
Everything else Tang Band lists
LF · Primary · 8″
- BL
- 6.6T·m
- Fs
- 40Hz
- Le
- 0.011mH
- Re
- 6.8Ω
- Sd
- 220cm²
- Mms
- 15g
- Qes
- 0.61
- Qms
- 1.6
- Qts
- 0.45
- SPL
- 90.5dB
- Vas
- 67.7L
- Xmax
- 3mm
- Power
- 40W
- Impedance
- 8Ω
- Power Peak
- 80
- Sensitivity
- 90dB
- Calculated sensitivity †
- 90.5dB
- Manufacturer sensitivity
- 90dB
02
Compare
Same-size drivers, compared with the W8-2145. Clear differences are green when better and red when worse.
This driverW8-2145
Best price
£150.67
Fs
40 Hz
Qts
0.45
Vas
67.7 L
BL
6.6 T·m
Xmax
3 mm
Sensitivity
90.5 dB
Power
40 W
VisatonBG 20
£30.00 · 80% less, betterFs38 Hz −5%
Qts0.44 –
Vas110 L +63%, worse
BL6.1 T·m −7%
Xmax2 mm −33%, worse
Sensitivity92.8 dB +2.3, better
PRV Audio8MR500-4
£37.34 · 75% less, betterFs78 Hz +96%, worse
Qts0.46 –
Vas20.8 L −69%, better
BL6.5 T·m –
Xmax3.3 mm +8%
Sensitivity95.2 dB +4.7, better
SB AcousticsSB20FRPC30-8
£37.67 · 75% less, betterFs39 Hz –
Qts0.45 –
Vas66.3 L –
BL7.2 T·m +8%
Xmax4.1 mm +37%, better
Sensitivity91.4 dB +0.9
MonacorSPM-205/8
£38.40 · 75% less, betterFs37 Hz −8%
Qts0.70 +56%, worse
Vas54 L −20%, better
BL6.5 T·m –
Xmax3 mm –
Sensitivity86.8 dB −3.7, worse
MonacorSPX-200WP
£41.87 · 72% less, betterFs36 Hz −10%, better
Qts0.59 +31%, worse
Vas60.5 L −11%, better
BL6.8 T·m +3%
Xmax2 mm −33%, worse
Sensitivity88.1 dB −2.4, worse
Dayton AudioPA200-8
£44.87 · 70% less, betterFs55 Hz +38%, worse
Qts0.48 +7%
Vas26.6 L −61%, better
BL9.3 T·m +41%, better
Xmax3 mm –
Sensitivity91.5 dB +1
CIAREHW202
£49.40 · 67% less, betterFs30 Hz −25%, better
Qts0.44 –
Vas83 L +23%, worse
BL6.7 T·m –
Xmax6.5 mm +117%, better
Sensitivity88.4 dB −2.1, worse
Beyma8BR40
£53.89 · 64% less, betterFs30 Hz −25%, better
Qts0.39 −13%, better
Vas89.1 L +32%, worse
BL6.8 T·m +3%
Xmax6.7 mm +123%, better
Sensitivity89 dB −1.5
Scanspeak18W/8424G00
£57.77 · 62% less, betterFs54 Hz +35%, worse
Qts0.45 –
Vas20.3 L −70%, better
BL6.6 T·m –
Xmax2.6 mm −13%, worse
Sensitivity90 dB −0.5
Dayton AudioRS225-4
£67.31 · 55% less, betterFs33 Hz −18%, better
Qts0.41 −9%
Vas46.4 L −31%, better
BL6.4 T·m −3%
Xmax6 mm +100%, better
Sensitivity87.1 dB −3.4, worse
Beyma8MI100
£73.79 · 51% less, betterFs90 Hz +125%, worse
Qts0.45 –
Vas12 L −82%, better
BL11.5 T·m +75%, better
Xmax3 mm –
Sensitivity94.6 dB +4.1, better
SEASH1288-08 CA22RNX
£119.94 · 20% less, betterFs29 Hz −28%, better
Qts0.41 −9%
Vas97 L +43%, worse
BL7 T·m +6%
Xmax6 mm +100%, better
Sensitivity88.6 dB −1.9
Scanspeak18W/8535-01
£145.25 · 4% lessFs25 Hz −38%, better
Qts0.38 −16%, better
Vas68.9 L –
BL5.9 T·m −10%, worse
Xmax5 mm +67%, better
Sensitivity85.7 dB −4.8, worse
Scanspeak18M/4631T00
£192.54 · 28% more, worseFs65 Hz +63%, worse
Qts0.60 +33%, worse
Vas14 L −79%, better
BL5.6 T·m −15%, worse
Xmax3 mm –
Sensitivity89.6 dB −0.9
SB AcousticsWO24P-4
£195.93 · 30% more, worseFs28 Hz −30%, better
Qts0.40 −11%, better
Vas71 L +5%
BL7.6 T·m +15%, better
Xmax8.5 mm +183%, better
Sensitivity87.7 dB −2.8, worse
Tang BandW8-2314
£293.02 · 94% more, worseFs38 Hz −5%
Qts0.46 –
Vas49.5 L −27%, better
BL6.1 T·m −8%
Xmax6 mm +100%, better
Sensitivity89 dB −1.5
Tang BandW8-1808
£358.37 · 138% more, worseFs45 Hz +13%, worse
Qts0.44 –
Vas88.1 L +30%, worse
BL5.3 T·m −20%, worse
Xmax5 mm +67%, better
Sensitivity92.9 dB +2.4, better
HiViS8-98
No current priceFs34 Hz −15%, better
Qts0.44 –
Vas64.9 L −4%
BL6.6 T·m –
Xmax5.8 mm +93%, better
Sensitivity88.9 dB −1.6
Supravox215 RTF 64 BI-CÔNE
No current priceFs57 Hz +43%, worse
Qts0.46 –
Vas80 L +18%, worse
BL6.5 T·m –
Xmax2.3 mm −23%, worse
Sensitivity96.5 dB +6, better
HiViS8-98R
No current priceFs33 Hz −18%, better
Qts0.42 −7%
Vas65.2 L −4%
BL6.9 T·m +5%
Xmax6 mm +100%, better
Sensitivity89 dB −1.5
MonacorSPM-205/4
No current priceFs37 Hz −8%
Qts0.55 +22%, worse
Vas72 L +6%
BL4.8 T·m −28%, worse
Xmax3 mm –
Sensitivity89.3 dB −1.2
PRV Audio8MR500-NDY-4
No current priceFs79 Hz +96%, worse
Qts0.54 +20%, worse
Vas24.3 L −64%, better
BL6.0 T·m −8%
Xmax3 mm –
Sensitivity95.2 dB +4.7, better
Cube AudioF8 NEO V2
No current priceFs39 Hz –
Qts0.47 +4%
Vas45 L −34%, better
BL9.5 T·m +44%, better
Xmax3 mm –
Sensitivity89.5 dB −1
Tang BandW8-1722B
No current priceFs35 Hz −13%, better
Qts0.51 +13%, worse
Vas46.3 L −32%, better
BL6.2 T·m −5%
Xmax9 mm +200%, better
Sensitivity87.4 dB −3.1, worse
CIARECW202
No current priceFs40 Hz –
Qts0.41 −9%
Vas48 L −29%, better
BL6.5 T·m –
Xmax6.5 mm +117%, better
Sensitivity90.1 dB –
PRV Audio69MR500-PHP-4
No current priceFs92 Hz +129%, worse
Qts0.65 +44%, worse
Vas15.2 L −78%, better
BL6.8 T·m +3%
Xmax2.9 mm −4%
Sensitivity94.4 dB +3.9, better
MarkaudioMA200-P MICA
No current priceFs39 Hz –
Qts0.37 −17%, better
Vas66.5 L –
BL7.0 T·m +7%
Xmax7 mm +133%, better
Sensitivity91.5 dB +1
Tang BandW8-750C
No current priceFs30 Hz −25%, better
Qts0.43 −4%
Vas57.0 L −16%, better
BL8.4 T·m +27%, better
Xmax3.9 mm +30%, better
Sensitivity86.9 dB −3.6, worse
MonacorSP-200X
No current priceFs50 Hz +25%, worse
Qts0.52 +16%, worse
Vas48 L −29%, better
BL6.1 T·m −7%
Xmax1.6 mm −47%, worse
Sensitivity91.4 dB +0.9
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- SoundImports4.8 out of 515 ratings · Checked 26 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 | £150.67, the lowest price | 6 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr