GRS8FR-8
£17.54 · 68% less, betterFs45 Hz −38%, better
Qts0.56 −5%
Vas37.0 L +109%, worse
BL8.5 T·m +9%
Xmax3 mm −6%
Sensitivity89.3 dB −2.8, worse
8-inch LF driver · ALPHA series · 125 W
Eminence ALPHA-8A 8Ω
8 Ω · 58–5000 Hz
- Fs
- 73Hz
- Xmax
- 3.2mm
- SPL
- 92dB
- Pe
- 125W
- BL
- 7.8T·m
- Vd
- 67cm³
- Qts
- 0.59
- Vas
- 18L
Eminence ALPHA-8A is an 8-inch 8 ohm LF driver rated at 125 W RMS. The validated T/S data includes Fs 73 Hz, Qts 0.59, Vas 17.7 L, Xmax 3.2 mm, sensitivity 92.1 dB, plus 67 cm³ Vd and 107 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 £54.66.
The published T/S values agree with each other
Thiele/Small
- Fs
- 73Hz
- Qts
- 0.59
- Qes
- 0.68
- Qms
- 4.6
- Vas
- 17.7L
- Re
- 5.3Ω
- Le
- 0.44mH
Motor and cone
- BL
- 7.8T·m
- Sd
- 210cm²
- Mms
- 17g
- Xmax
- 3.2mm
- Vd †
- 67cm³
Power and response
- Sensitivity †
- 92.1dB
- Manufacturer sensitivity
- 94dB
- Power
- 125W
- Impedance
- 8Ω
- Range
- 58–5000Hz
- EBP †
- 107 · Leans vented
Size and mounting
- Diameter
- 209.3mm
- Cutout
- 181.1mm
- Bolt circle
- 196.8mm
- Depth
- 82.5mm
- Weight
- 2.0kg
Other published values
- Cms
- 0.28mm/N
- Xmech
- 7.1
- Power Program
- 250
Sensitivity shows 92.1 dB, calculated from the T/S values. Eminence publishes 94.0 dB, 1.9 dB apart.
† Calculated by bits from the published values
What this validation status means
Everything else Eminence lists
LF · Primary · 8″
- BL
- 7.8T·m
- Fs
- 73Hz
- Le
- 0.44mH
- Re
- 5.3Ω
- Sd
- 210cm²
- Cms
- 0.28mm/N
- Mms
- 17g
- Qes
- 0.68
- Qms
- 4.6
- Qts
- 0.59
- SPL
- 92.1dB
- Vas
- 17.7L
- Xmax
- 3.2mm
- Xmech
- 7.1
- Power
- 125W
- Impedance
- 8Ω
- Sensitivity
- 94dB
- Low limit
- 58Hz
- Power Program
- 250
- Calculated sensitivity †
- 92.1dB
- High limit
- 5000Hz
- Manufacturer sensitivity
- 94dB
- Weight
- 2.0kg
- Diameter
- 209.3mm
- Depth
- 82.5mm
- Cutout
- 181.1mm
- Bolt circle
- 196.8mm
02
Compare
Same-size drivers, compared with the ALPHA-8A. Clear differences are green when better and red when worse.
This driverALPHA-8A
Best price
£54.66
Fs
73 Hz
Qts
0.59
Vas
17.7 L
BL
7.8 T·m
Xmax
3.2 mm
Sensitivity
92.1 dB
Power
125 W
GRS8PT-8
£24.68 · 55% less, betterFs59 Hz −19%, better
Qts0.55 −7%
Vas20.1 L +14%, worse
BL10.2 T·m +31%, better
Xmax6.5 mm +103%, better
Sensitivity90.5 dB −1.6
REDCATT81FHW
£28.47 · 48% less, betterFs39 Hz −47%, better
Qts0.52 −12%, better
Vas21.5 L +21%, worse
BL8.3 T·m +6%
Xmax6.1 mm +91%, better
Sensitivity85.5 dB −6.6, worse
Dayton AudioDA175-8
£29.91 · 45% less, betterFs39 Hz −47%, better
Qts0.58 –
Vas16.3 L −8%
BL7.2 T·m −8%
Xmax4.3 mm +33%, better
Sensitivity83.4 dB −8.7, worse
Dayton AudioPCS8-4
£29.91 · 45% less, betterFs43 Hz −41%, better
Qts0.49 −17%, better
Vas20.5 L +16%, worse
BL8.4 T·m +8%
Xmax5 mm +56%, better
Sensitivity86.7 dB −5.4, worse
Sica8 H 1 CS
£33.41 · 39% less, betterFs50 Hz −32%, better
Qts0.54 −8%
Vas27.8 L +57%, worse
BL8.7 T·m +12%, better
Xmax4 mm +25%, better
Sensitivity89.5 dB −2.6, worse
PRV Audio8MR450A
£33.60 · 39% less, betterFs65 Hz −11%, better
Qts0.55 −7%
Vas34.9 L +97%, worse
BL7.6 T·m –
Xmax4 mm +25%, better
Sensitivity94.3 dB +2.2, better
FaitalPRO8FE200
£33.72 · 38% less, betterFs80 Hz +10%
Qts0.63 +7%
Vas16.1 L −9%
BL8.2 T·m +5%
Xmax4.7 mm +46%, better
Sensitivity93 dB +0.9
PRV Audio8MR500-4
£37.34 · 32% less, betterFs78 Hz +7%
Qts0.46 −22%, better
Vas20.8 L +18%, worse
BL6.5 T·m −17%, worse
Xmax3.3 mm –
Sensitivity95.2 dB +3.1, better
MonacorSPX-200WP
£41.87 · 23% less, betterFs36 Hz −51%, better
Qts0.59 –
Vas60.5 L +242%, worse
BL6.8 T·m −13%, worse
Xmax2 mm −38%, worse
Sensitivity88.1 dB −4, worse
REDCATT82FHM
£49.82 · 9% less, betterFs42 Hz −42%, better
Qts0.61 +3%
Vas33.6 L +90%, worse
BL7.6 T·m −3%
Xmax5.5 mm +70%, better
Sensitivity87.2 dB −4.9, worse
REDCATT8FHW-1
£51.91 · 5% less, betterFs41 Hz −44%, better
Qts0.60 –
Vas19.6 L +11%, worse
BL7.9 T·m –
Xmax8.7 mm +172%, better
Sensitivity84.6 dB −7.5, worse
CIARECME200
£67.27 · 23% more, worseFs76 Hz +4%
Qts0.37 −37%, better
Vas18 L –
BL7.3 T·m −6%
Xmax3.5 mm +9%
Sensitivity95.1 dB +3, better
Dayton AudioRSS210HF-4
£144.69 · 165% more, worseFs30 Hz −59%, better
Qts0.57 −3%
Vas23.7 L +34%, worse
BL8.1 T·m +4%
Xmax9 mm +181%, better
Sensitivity81.5 dB −10.6, worse
Scanspeak18M/4631T00
£192.54 · 252% more, worseFs65 Hz −11%, better
Qts0.60 –
Vas14 L −21%, better
BL5.6 T·m −28%, worse
Xmax3 mm −6%
Sensitivity89.6 dB −2.5, worse
Scanspeak18M/8631T00
£192.54 · 252% more, worseFs65 Hz −11%, better
Qts0.71 +20%, worse
Vas14 L −21%, better
BL6.5 T·m −17%, worse
Xmax3 mm −6%
Sensitivity88.7 dB −3.4, worse
PRV Audio69MR500-PHP-4
No current priceFs92 Hz +26%, worse
Qts0.65 +10%, worse
Vas15.2 L −14%, better
BL6.8 T·m −13%, worse
Xmax2.9 mm −10%, worse
Sensitivity94.4 dB +2.3, better
PRV Audio8MB500-4
No current priceFs72 Hz –
Qts0.64 +8%
Vas17.3 L –
BL7.5 T·m −4%
Xmax4.5 mm +41%, better
Sensitivity91.9 dB –
PRV Audio8MR360
No current priceFs91 Hz +24%, worse
Qts0.56 −5%
Vas18.5 L +5%
BL8.3 T·m +6%
Xmax4 mm +25%, better
Sensitivity95.8 dB +3.7, better
PRV Audio8MR450CF-4
No current priceFs83 Hz +13%, worse
Qts0.71 +20%, worse
Vas17.5 L –
BL6.1 T·m −22%, worse
Xmax3.5 mm +9%
Sensitivity93.4 dB +1.3
PRV Audio8MR400B-4
No current priceFs93 Hz +27%, worse
Qts0.74 +25%, worse
Vas15.7 L −11%, better
BL6.3 T·m −19%, worse
Xmax3.3 mm –
Sensitivity94.2 dB +2.1, better
PRV Audio8MR400
No current priceFs78 Hz +7%
Qts0.52 −12%, better
Vas20.2 L +14%, worse
BL8.2 T·m +4%
Xmax4 mm +25%, better
Sensitivity94.4 dB +2.3, better
PRV Audio8MR500-NDY-4
No current priceFs79 Hz +8%
Qts0.54 −8%
Vas24.3 L +38%, worse
BL6.0 T·m −23%, worse
Xmax3 mm −6%
Sensitivity95.2 dB +3.1, better
CelestionTF0815RE
No current priceFs65 Hz −11%, better
Qts0.53 −10%
Vas22.1 L +25%, worse
BL8.9 T·m +14%, better
Xmax5.3 mm +64%, better
Sensitivity91.7 dB –
MonacorSPM-205/4
No current priceFs37 Hz −49%, better
Qts0.55 −7%
Vas72 L +307%, worse
BL4.8 T·m −39%, worse
Xmax3 mm −6%
Sensitivity89.3 dB −2.8, worse
PRV Audio8MR360-4
No current priceFs98 Hz +34%, worse
Qts0.51 −14%, better
Vas14.4 L −18%, better
BL6.8 T·m −12%, worse
Xmax4 mm +25%, better
Sensitivity96.1 dB +4, better
No photo
PHL Audio2001
No current priceFs77 Hz +5%
Qts0.53 −10%, better
Vas13.8 L −22%, better
BL9.5 T·m +22%, better
Xmax5.5 mm +72%, better
Sensitivity92.2 dB –
No photo
PHL Audio2001NDU
No current priceFs77 Hz +5%
Qts0.53 −10%, better
Vas13.8 L −22%, better
BL9.5 T·m +22%, better
Xmax5.5 mm +72%, better
Sensitivity92.2 dB –
HiViD8.4MKII
No current priceFs36 Hz −51%, better
Qts0.56 −5%
Vas40 L +126%, worse
BL7.1 T·m −9%
Xmax5 mm +56%, better
Sensitivity86.9 dB −5.2, worse
Beyma8CX300FE
No current priceFs89 Hz +22%, worse
Qts0.55 −7%
Vas10.8 L −39%, better
BL9.6 T·m +23%, better
Xmax6 mm +87%, better
Sensitivity92.9 dB +0.8
Tune the match
Choose the published values that matter to your design. Size stays matched to this driver.
Qts
Qes
VasL
Xmaxmm
BLTm
- Thomann4.7 out of 544 ratings · Checked 25 Oct 2026Read reviews on Thomann
- Parts Express4.8 out of 524 ratings · Checked 25 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 |
|---|---|---|---|---|
Blue Aran | £54.66, the lowest price | 1 in stock | Visit shop at Blue Aran | |
Lean Audio | £68.12 | 25% above the lowest price | 1 in stock | Visit shop at Lean Audio |
Lean Business | £68.12 | 25% above the lowest price | Stock not listed | Visit shop at Lean Business |
Thomann | £80.00 | 46% above the lowest price | In stock | Visit shop at Thomann |
Parts Express Import VAT and duty may apply | £65.82 | 20% above the lowest price | 4 in stock | Visit shop at Parts Express |
Best price over time
Tracked since 1 Apr
Recent changes
- 14 OctThomann£81.00 → £80.00Down 1.2% from £81.00
- 6 OctThomann£82.00 → £81.00Down 1.2% from £82.00
- 4 SepThomann£81.00 → £82.00Up 1.2% from £81.00