GRS6PR-8
£13.37Fs69 Hz −23%, better
Qts0.87 +30%, worse
Vas10.6 L +25%, worse
BL6.1 T·m –
Xmax3 mm −6%
Sensitivity86.8 dB −4.2, worse
No product photo
6.5-inch LF driver · CSF061 series · 30 mm voice coil · 50 W
Lavoce CSF061.21 8Ω
8 Ω · 90–22000 Hz
No price for delivery to the UK
- Fs
- 90Hz
- Xmax
- 3.2mm
- SPL
- 91dB
- Pe
- 50W
- BL
- 6.1T·m
- Vd
- 42cm³
- Qts
- 0.67
- Vas
- 8L
Lavoce CSF061.21 is a 6.5-inch 8 ohm LF driver rated at 50 W RMS. The validated T/S data includes Fs 90 Hz, Qts 0.67, Vas 8.5 L, Xmax 3.2 mm, sensitivity 91 dB, plus 42 cm³ Vd and 114 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
- 90Hz
- Qts
- 0.67
- Qes
- 0.79
- Qms
- 4.4
- Vas
- 8.5L
- Re
- 5.7Ω
- Le
- 0.37mH
Motor and cone
- BL
- 6.1T·m
- Sd
- 132cm²
- Mms
- 9g
- Xmax
- 3.2mm
- Vd †
- 42cm³
- Voice coil
- 30mm
Power and response
- Sensitivity †
- 91dB
- Manufacturer sensitivity
- 92.5dB
- Power
- 50W
- Impedance
- 8Ω
- Min. impedance
- 6Ω
- Range
- 90–22000Hz
- EBP †
- 114 · Leans vented
Size and mounting
- Weight
- 1kg
Other published values
- Cms
- 0.34mm/N
- Xmech
- 4.2
- Power Program
- 100
Sensitivity shows 91.0 dB, calculated from the T/S values. Lavoce publishes 92.5 dB, 1.5 dB apart.
Excursion and motor values come from the LF section; the frequency range spans every section.
† Calculated by bits from the published values
What this validation status means
Components and manufacturer details
LF
- BL
- 6.1T·m
- Fs
- 90Hz
- Le
- 0.37mH
- Re
- 5.7Ω
- Sd
- 132cm²
- Cms
- 0.34mm/N
- Mms
- 9g
- Qes
- 0.79
- Qms
- 4.4
- Qts
- 0.67
- SPL
- 91dB
- Vas
- 8.5L
- Xmax
- 3.2mm
- Xmech
- 4.2
- Power
- 50W
- Impedance
- 8Ω
- Sensitivity
- 92.5dB
- Low limit
- 90Hz
- Power Program
- 100
- Calculated sensitivity †
- 91dB
- High limit
- 22000Hz
- Manufacturer sensitivity
- 92.5dB
- Min. impedance
- 6Ω
- Voice coil
- 30mm
- Weight
- 1kg
HF
- Throat
- 20mm
- Voice coil
- 14mm
02
Compare
Same-size drivers, compared with the CSF061.21. Clear differences are green when better and red when worse.
No photo
This driverCSF061.21
Best price
–
Fs
90 Hz
Qts
0.67
Vas
8.5 L
BL
6.1 T·m
Xmax
3.2 mm
Sensitivity
91 dB
Power
50 W
GRS6PT-8
£15.66Fs94 Hz +4%
Qts0.72 +7%
Vas9.5 L +12%, worse
BL6.4 T·m +5%
Xmax4.2 mm +31%, better
Sensitivity91.7 dB +0.7
VisatonBG 17
£18.27Fs120 Hz +33%, worse
Qts0.74 +10%, worse
Vas8.2 L −3%
BL5.7 T·m −6%
Xmax1.5 mm −53%, worse
Sensitivity93.6 dB +2.6, better
REDCATT61FHM-2
£19.95Fs44 Hz −51%, better
Qts0.52 −22%, better
Vas14.4 L +70%, worse
BL6.0 T·m –
Xmax3.2 mm –
Sensitivity85.3 dB −5.7, worse
Dayton AudioPA165-8
£24.61Fs81 Hz −10%, better
Qts0.47 −30%, better
Vas9.2 L +8%
BL6.3 T·m +4%
Xmax–
Sensitivity91.1 dB –
PRV Audio6MR250B-4
£26.05Fs143 Hz +59%, worse
Qts0.82 +22%, worse
Vas4 L −53%, better
BL5.8 T·m −4%
Xmax3.3 mm –
Sensitivity93.4 dB +2.4, better
MonacorSPM-165/8
£27.66Fs49 Hz −46%, better
Qts0.55 −18%, better
Vas33 L +289%, worse
BL5.8 T·m −5%
Xmax3 mm −6%
Sensitivity89.7 dB −1.3
MonacorSPH-174KE
£29.34Fs42 Hz −53%, better
Qts0.51 −24%, better
Vas26 L +207%, worse
BL5.9 T·m –
Xmax3 mm −6%
Sensitivity86.8 dB −4.2, worse
Dayton AudioMB620-8
£33.56Fs104 Hz +16%, worse
Qts0.59 −12%, better
Vas6.8 L −20%, better
BL6.7 T·m +10%
Xmax2 mm −38%, worse
Sensitivity92.5 dB +1.5
Sica6 D 1.5 CS
£37.30Fs109 Hz +21%, worse
Qts0.63 −6%
Vas4.4 L −48%, better
BL7.4 T·m +21%, better
Xmax1.5 mm −53%, worse
Sensitivity90.6 dB –
Dayton AudioLW150-4
£41.02Fs63 Hz −30%, better
Qts0.64 −4%
Vas3.5 L −59%, better
BL6.5 T·m +7%
Xmax4 mm +25%, better
Sensitivity82.8 dB −8.2, worse
PeerlessHDS-P830883
£41.97Fs68 Hz −24%, better
Qts0.67 –
Vas6.8 L −20%, better
BL7.8 T·m +28%, better
Xmax7.6 mm +138%, better
Sensitivity85.5 dB −5.5, worse
PRV Audio6MR400-4
£48.58Fs144 Hz +60%, worse
Qts0.60 −10%, better
Vas4.4 L −48%, better
BL6.4 T·m +5%
Xmax3.3 mm –
Sensitivity95.2 dB +4.2, better
WavecorWF146WA02
£57.45Fs58 Hz −36%, better
Qts0.51 −24%, better
Vas10 L +18%, worse
BL6.4 T·m +5%
Xmax3 mm −6%
Sensitivity87.6 dB −3.4, worse
WavecorWF146WA01
£57.45Fs56 Hz −38%, better
Qts0.42 −37%, better
Vas10 L +18%, worse
BL5.1 T·m −16%, worse
Xmax3 mm −6%
Sensitivity87.9 dB −3.1, worse
VisatonW 165 A
£72.88Fs60 Hz −33%, better
Qts0.63 −6%
Vas7.8 L −8%
BL5.0 T·m −18%, worse
Xmax10.3 mm +222%, better
Sensitivity85.6 dB −5.4, worse
LavoceCSF061.70K
£86.22Fs97 Hz +8%
Qts0.69 –
Vas6.5 L −23%, better
BL6.9 T·m +13%, better
Xmax3.9 mm +22%, better
Sensitivity90.5 dB −0.5
Scanspeak18M/8631T00
£192.75Fs65 Hz −28%, better
Qts0.71 +6%
Vas14 L +65%, worse
BL6.5 T·m +7%
Xmax3 mm −6%
Sensitivity88.7 dB −2.3, worse
Scanspeak18M/4631T00
£192.75Fs65 Hz −28%, better
Qts0.60 −10%, better
Vas14 L +65%, worse
BL5.6 T·m −8%
Xmax3 mm −6%
Sensitivity89.6 dB −1.4
Supravox165-2000 MK2
£197.56Fs77 Hz −15%, better
Qts0.70 +4%
Vas25.8 L +204%, worse
BL3.5 T·m −42%, worse
Xmax2.9 mm −9%
Sensitivity93.7 dB +2.7, better
Dayton AudioE150MR-8
No current priceFs74 Hz −18%, better
Qts0.58 −13%, better
Vas8 L −6%
BL6.1 T·m –
Xmax2.7 mm −16%, worse
Sensitivity88.9 dB −2.1, worse
CelestionFTX0617
No current priceFs100 Hz +11%, worse
Qts0.74 +10%, worse
Vas7.4 L −13%, better
BL6.6 T·m +8%
Xmax3.5 mm +9%
Sensitivity91 dB –
PRV Audio69FR250-4
No current priceFs82 Hz −9%
Qts0.70 +4%
Vas13.9 L +64%, worse
BL6.1 T·m –
Xmax3.5 mm +9%
Sensitivity92.2 dB +1.2
PRV Audio6MR400CF-4
No current priceFs131 Hz +46%, worse
Qts0.76 +13%, worse
Vas4.1 L −52%, better
BL6.3 T·m +4%
Xmax3.5 mm +9%
Sensitivity92.8 dB +1.8
CIAREHMB165
No current priceFs86 Hz −4%
Qts0.53 −21%, better
Vas8.6 L –
BL7 T·m +15%, better
Xmax3.5 mm +9%
Sensitivity91.4 dB –
Lii AudioST-5
No current priceFs56 Hz −38%, better
Qts0.66 –
Vas14.3 L +69%, worse
BL5.8 T·m −4%
Xmax4 mm +25%, better
Sensitivity86.7 dB −4.3, worse
REDCATT61XR
No current priceFs64 Hz −29%, better
Qts0.72 +7%
Vas8.6 L –
BL4.8 T·m −22%, worse
Xmax8.1 mm +153%, better
Sensitivity85.7 dB −5.3, worse
PRV Audio6MR400-NDY-4
No current priceFs178 Hz +98%, worse
Qts0.87 +30%, worse
Vas2.4 L −71%, better
BL6.0 T·m –
Xmax3.3 mm –
Sensitivity93.7 dB +2.7, better
PRV Audio6MB400-4
No current priceFs125 Hz +39%, worse
Qts0.52 −22%, better
Vas5.3 L −38%, better
BL6.6 T·m +8%
Xmax3 mm −6%
Sensitivity94.7 dB +3.7, better
Dayton AudioE150MR-4
No current priceFs75 Hz −17%, better
Qts0.52 −22%, better
Vas7.4 L −13%, better
BL4.9 T·m −20%, worse
Xmax2.7 mm −16%, worse
Sensitivity89.1 dB −1.9
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Parts Express4.3 out of 58 ratings · Checked 22 Oct 2026Read reviews on Parts Express
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| Shop | Price | Against the lowest | Stock | Link |
|---|---|---|---|---|
Blue Aran | £29.00 | Due 2 Dec 2026 | Visit shop at Blue Aran | |
Parts Express Import VAT and duty may apply | £32.08 | Back order | Visit shop at Parts Express |