GRS6PR-8
£13.36 · 49% less, betterFs69 Hz −52%, better
Qts0.87 +6%
Vas10.6 L +165%, worse
BL6.1 T·m +5%
Xmax3 mm −8%
Sensitivity86.8 dB −6.6, worse
6-inch LF driver · 38 mm voice coil
PRV Audio 6MR250B-4 4Ω
4 Ω · 145–8000 Hz
£26.11
13%Parts Express · 5 in stock · Ships from United States · All 2 offers
- Fs
- 143Hz
- Xmax
- 3.3mm
- SPL
- 93dB
- Pe
- –
- BL
- 5.8T·m
- Vd
- 46cm³
- Qts
- 0.82
- Vas
- 4L
PRV Audio 6MR250B-4 is a 6-inch 4 ohm LF driver. The validated T/S data includes Fs 143 Hz, Qts 0.82, Vas 4 L, Xmax 3.3 mm, sensitivity 93.4 dB, plus 46 cm³ Vd and 168 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 £26.11.
The published T/S values agree with each other
Thiele/Small
- Fs
- 143Hz
- Qts
- 0.82
- Qes
- 0.85
- Qms
- 28.7
- Vas
- 4L
- Re
- 3.6Ω
- Le
- 0.14mH
Motor and cone
- BL
- 5.8T·m
- Sd
- 143cm²
- Mms
- 9g
- Xmax
- 3.3mm
- Vd †
- 46cm³
- Voice coil
- 38mm
Power and response
- Sensitivity †
- 93.4dB
- Manufacturer sensitivity
- 93.5dB
- Impedance
- 4Ω
- Range
- 145–8000Hz
- Crossover
- 145Hz
- EBP †
- 168 · Leans vented
Size and mounting
- Diameter
- 165mm
- Cutout
- 144mm
- Depth
- 60.5mm
- Weight
- 1.6kg
Other published values
- Cms
- 0.14mm/N
Other dimensions
- Mounting Depth
- 54.5
† Calculated by bits from the published values
What this validation status means
Everything else PRV Audio lists
MF · Primary · 6″
- BL
- 5.8T·m
- Fs
- 143Hz
- Le
- 0.14mH
- Re
- 3.6Ω
- Sd
- 143cm²
- Cms
- 0.14mm/N
- Mms
- 9g
- Qes
- 0.85
- Qms
- 28.7
- Qts
- 0.82
- SPL
- 93.4dB
- Vas
- 4L
- Xmax
- 3.3mm
- Impedance
- 4Ω
- Sensitivity
- 93.5dB
- Low limit
- 145Hz
- Calculated sensitivity †
- 93.4dB
- High limit
- 8000Hz
- Manufacturer sensitivity
- 93.5dB
- Voice coil
- 38mm
- Crossover
- 145Hz
- Weight
- 1.6kg
- Diameter
- 165mm
- Depth
- 60.5mm
- Mounting Depth
- 54.5
- Cutout
- 144mm
02
Compare
Same-size drivers, compared with the 6MR250B-4. Clear differences are green when better and red when worse.
This driver6MR250B-4
Best price
£26.11
Fs
143 Hz
Qts
0.82
Vas
4 L
BL
5.8 T·m
Xmax
3.3 mm
Sensitivity
93.4 dB
Power
–
GRS6PT-8
£15.70 · 40% less, betterFs94 Hz −34%, better
Qts0.72 −12%, better
Vas9.5 L +137%, worse
BL6.4 T·m +10%
Xmax4.2 mm +29%, better
Sensitivity91.7 dB −1.7
REDCATT5FR
£15.83 · 39% less, betterFs92 Hz −36%, better
Qts0.69 −16%, better
Vas3.8 L −5%
BL6.3 T·m +8%
Xmax2 mm −38%, worse
Sensitivity88.1 dB −5.3, worse
Sica5 D 1 CS
£19.68 · 25% less, betterFs79 Hz −45%, better
Qts0.52 −37%, better
Vas5.5 L +38%, worse
BL5.7 T·m –
Xmax3 mm −8%
Sensitivity88.7 dB −4.7, worse
PRV Audio6MR200A-4
£20.13 · 23% less, betterFs138 Hz −3%
Qts0.97 +18%, worse
Vas3.9 L –
BL4.9 T·m −15%, worse
Xmax2.6 mm −19%, worse
Sensitivity91.8 dB −1.6
PRV Audio6MB200-4
£22.37 · 14% less, betterFs124 Hz −13%, better
Qts0.97 +18%, worse
Vas4.0 L –
BL5.8 T·m –
Xmax4.8 mm +48%, better
Sensitivity90.7 dB −2.7, worse
MonacorSPM-165/8
£27.63 · 6% more, worseFs49 Hz −66%, better
Qts0.55 −33%, better
Vas33 L +725%, worse
BL5.8 T·m –
Xmax3 mm −8%
Sensitivity89.7 dB −3.7, worse
LavoceCSF051.21
£29.17 · 12% more, worseFs110 Hz −23%, better
Qts0.64 −22%, better
Vas4.1 L –
BL5.9 T·m –
Xmax3.4 mm +5%
Sensitivity90.7 dB −2.7, worse
Dayton AudioND140-8
£32.15 · 23% more, worseFs57 Hz −60%, better
Qts0.68 −17%, better
Vas7.7 L +94%, worse
BL6.0 T·m +4%
Xmax4 mm +23%, better
Sensitivity84.5 dB −8.9, worse
Dayton AudioLW150-4
£41.13 · 57% more, worseFs63 Hz −56%, better
Qts0.64 −22%, better
Vas3.5 L −13%, better
BL6.5 T·m +12%, better
Xmax4 mm +23%, better
Sensitivity82.8 dB −10.6, worse
Dayton AudioRS125T-8
£47.22 · 81% more, worseFs76 Hz −47%, better
Qts0.50 −39%, better
Vas3.6 L −11%, better
BL5.0 T·m −13%, worse
Xmax2.8 mm −14%, worse
Sensitivity86.1 dB −7.3, worse
PRV Audio6MR400-4
£48.52 · 86% more, worseFs144 Hz –
Qts0.60 −27%, better
Vas4.4 L +10%, worse
BL6.4 T·m +9%
Xmax3.3 mm –
Sensitivity95.2 dB +1.8
Sica5 N 1.5 PL
£65.31 · 150% more, worseFs111 Hz −23%, better
Qts0.56 −32%, better
Vas3 L −25%, better
BL6.2 T·m +7%
Xmax3 mm −8%
Sensitivity89.5 dB −3.9, worse
LavoceCSF061.70K
£86.22 · 230% more, worseFs97 Hz −32%, better
Qts0.69 −16%, better
Vas6.5 L +63%, worse
BL6.9 T·m +19%, better
Xmax3.9 mm +20%, better
Sensitivity90.5 dB −2.9, worse
B&C5CXN36
£111.20 · 326% more, worseFs95 Hz −34%, better
Qts0.90 +10%
Vas4.4 L +10%, worse
BL5.4 T·m −7%
Xmax5.5 mm +69%, better
Sensitivity87.9 dB −5.5, worse
Scanspeak18M/8631T00
£192.54 · 637% more, worseFs65 Hz −55%, better
Qts0.71 −13%, better
Vas14 L +250%, worse
BL6.5 T·m +12%, better
Xmax3 mm −8%
Sensitivity88.7 dB −4.7, worse
AccutonC90-6-724
£527.46 · 1920% more, worseFs83 Hz −42%, better
Qts0.60 −27%, better
Vas5.1 L +27%, worse
BL6.0 T·m –
Xmax3 mm −8%
Sensitivity88.4 dB −5, worse
PRV Audio6MR400CF-4
No current priceFs131 Hz −8%
Qts0.76 −7%
Vas4.1 L –
BL6.3 T·m +9%
Xmax3.5 mm +8%
Sensitivity92.8 dB −0.6
PRV Audio6MR400-NDY-4
No current priceFs178 Hz +25%, worse
Qts0.87 +6%
Vas2.4 L −39%, better
BL6.0 T·m +4%
Xmax3.3 mm –
Sensitivity93.7 dB –
Dayton AudioCFC150-8
No current priceFs80 Hz −44%, better
Qts0.87 +6%
Vas4.1 L +3%
BL5.7 T·m –
Xmax3.5 mm +8%
Sensitivity84.8 dB −8.6, worse
Dayton AudioCFC150-4
No current priceFs77 Hz −46%, better
Qts0.70 −15%, better
Vas4.2 L +4%
BL4.7 T·m −19%, worse
Xmax3.5 mm +8%
Sensitivity85.6 dB −7.8, worse
No photo
LavoceCSF061.21
No current priceFs90 Hz −37%, better
Qts0.67 −18%, better
Vas8.5 L +112%, worse
BL6.1 T·m +5%
Xmax3.2 mm –
Sensitivity91 dB −2.4, worse
CelestionFTX0617
No current priceFs100 Hz −30%, better
Qts0.74 −10%
Vas7.4 L +84%, worse
BL6.6 T·m +13%, better
Xmax3.5 mm +8%
Sensitivity91 dB −2.4, worse
JensenMOD5-30-8
No current priceFs125 Hz −13%, better
Qts0.84 –
Vas3.3 L −18%, better
BL4.6 T·m −21%, worse
Xmax0.5 mm −85%, worse
Sensitivity90.3 dB −3.1, worse
PRV Audio69FR250-4
No current priceFs82 Hz −43%, better
Qts0.70 −15%, better
Vas13.9 L +248%, worse
BL6.1 T·m +5%
Xmax3.5 mm +8%
Sensitivity92.2 dB −1.2
LavoceWSF051.02
No current priceFs106 Hz −26%, better
Qts0.60 −27%, better
Vas3.3 L −19%, better
BL6.4 T·m +10%
Xmax3.1 mm −5%
Sensitivity89.7 dB −3.7, worse
CelestionTFX0515-16
No current priceFs110 Hz −23%, better
Qts0.80 –
Vas2.0 L −49%, better
BL8.6 T·m +47%, better
Xmax3.8 mm +15%, better
Sensitivity87.1 dB −6.3, worse
CIAREHMB135
No current priceFs130 Hz −9%
Qts0.79 −4%
Vas2.9 L −28%, better
BL4.5 T·m −23%, worse
Xmax3 mm −8%
Sensitivity89 dB −4.4, worse
Lii AudioST-5
No current priceFs56 Hz −61%, better
Qts0.66 −19%, better
Vas14.3 L +258%, worse
BL5.8 T·m –
Xmax4 mm +23%, better
Sensitivity86.7 dB −6.7, worse
PeerlessFSL-0512R01-08
No current priceFs120 Hz −16%, better
Qts0.58 −29%, better
Vas3.5 L −13%, better
BL6.4 T·m +11%, better
Xmax4.3 mm +33%, better
Sensitivity91 dB −2.4, worse
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Parts Express5.0 out of 566 ratings · Checked 24 Oct 2026Read reviews on Parts Express
Each shop collects its own ratings. Bits shows them as published and doesn't verify them.
| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Parts Express Import VAT and duty may apply | £26.11, the lowest price | 5 in stock | Visit shop at Parts Express | |
SoundImports Import VAT and duty may apply | £41.82 | 60% above the lowest price | 2 in stock | Visit shop at SoundImports |
Best price over time
Tracked since 1 Apr
Recent changes
- 25 SepParts Express£29.85 → £26.11Down 13% from £29.85