15-inch LF driver · 89 mm voice coil · 700 W

RCF MB15X351 8Ω

Name: RCF MB15X351 8 Ohm
Brand: RCF
SKU: MB15X351

8 Ω · 40–2500 Hz

No price for delivery to the UK

All 2 offers

Open in 00 Simulator

Fs: 46Hz
Xmax: 7mm
SPL: 97dB
Pe: 700W
BL: 22.8T·m
Vd: 630cm³
Qts: 0.31
Vas: 114L

See all 26 specs

Specifications

Published by RCF

Manufacturer page

Datasheet PDF

RCF MB15X351 is a 15-inch 8 ohm LF driver rated at 700 W RMS. The validated T/S data includes Fs 46 Hz, Qts 0.31, Vas 114 L, Xmax 7 mm, sensitivity 97.3 dB, plus 630 cm³ Vd and 139 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: 46Hz
Qts: 0.31
Qes: 0.33
Qms: 6.7
Vas: 114L
Re: 5.4Ω
Le: 0.90mH

Motor and cone

BL: 22.8T·m
Sd: 900cm²
Mms: 106g
Xmax: 7mm
Vd †: 630cm³
Voice coil: 89mm

Power and response

Sensitivity †: 97.3dB
Manufacturer sensitivity: 99dB
Power: 700W
Impedance: 8Ω
Min. impedance: 6.5Ω
Range: 40–2500Hz
EBP †: 139 · Leans vented

Size and mounting

Diameter: 393mm
Cutout: 354mm
Bolt circle: 376mm
Weight: 8.2kg

Other published values

Xmech: 40
Power Program: 1400

Sensitivity shows 97.3 dB, calculated from the T/S values. RCF publishes 99.0 dB, 1.7 dB apart.

† Calculated by bits from the published values

What this validation status means

Everything else RCF lists

LF · Primary · 15″

BL: 22.8T·m
Fs: 46Hz
Le: 0.90mH
Re: 5.4Ω
Sd: 900cm²
Mms: 106g
Qes: 0.33
Qms: 6.7
Qts: 0.31
SPL: 97.3dB
Vas: 114L
Xmax: 7mm
Xmech: 40
Power: 700W
Impedance: 8Ω
Sensitivity: 99dB
Low limit: 40Hz
Power Program: 1400
Calculated sensitivity †: 97.3dB
High limit: 2500Hz
Manufacturer sensitivity: 99dB
Min. impedance: 6.5Ω
Voice coil: 89mm
Weight: 8.2kg
Diameter: 393mm
Cutout: 354mm
Bolt circle: 376mm

Compare

Same-size drivers, compared with the MB15X351. Clear differences are green when better and red when worse.

This driverMB15X351

Best price

–

46 Hz

Qts

0.31

Vas

114 L

22.8 T·m

Xmax

7 mm

Sensitivity

97.3 dB

Power

700 W

B&C15CL76

£127.74

Fs42 Hz −9%

Qts0.33 +6%

Vas135 L +18%

BL21 T·m −8%

Xmax7 mm –

Sensitivity96.7 dB −0.6

SB AudienceROSSO-15MW500

£173.91

Fs42 Hz −9%

Qts0.33 +6%

Vas121.3 L +6%

BL23.2 T·m –

Xmax8.4 mm +20%

Sensitivity96.1 dB −1.2

CelestionCF1540HD

£175.00

Fs41 Hz −11%

Qts0.30 –

Vas108.3 L −5%

BL24.4 T·m +7%

Xmax10.5 mm +50%

Sensitivity95.6 dB −1.7

BMS15S330

£194.97

Fs39 Hz −15%

Qts0.32 +3%

Vas152 L +33%

BL23 T·m –

Xmax8 mm +14%

Sensitivity96.3 dB −1

B&C15PZB100

£199.99

Fs39 Hz −15%

Qts0.29 −6%

Vas110 L −4%

BL25.8 T·m +13%

Xmax8 mm +14%

Sensitivity95.4 dB −1.9

Precision DevicesPD.154C001

£219.00

Fs45 Hz –

Qts0.31 –

Vas128 L +12%

BL25.5 T·m +12%

Xmax8.2 mm +17%

Sensitivity97.4 dB –

Beyma15MC700ND

£226.76

Fs49 Hz +7%

Qts0.31 –

Vas105 L −8%

BL22.6 T·m –

Xmax7 mm –

Sensitivity97.6 dB –

Beyma14MC700ND

£229.73

Fs51 Hz +11%

Qts0.28 −10%

Vas78 L −32%

BL22 T·m −4%

Xmax7 mm –

Sensitivity97.4 dB –

Sica15 PF 3

£234.41

Fs45 Hz –

Qts0.31 –

Vas117.6 L +3%

BL21.9 T·m −4%

Xmax8 mm +14%

Sensitivity97.1 dB –

Eighteen Sound15NW530

£243.16

Fs43 Hz −7%

Qts0.33 +6%

Vas154 L +35%

BL22 T·m −4%

Xmax7.5 mm +7%

Sensitivity97.5 dB –

Eighteen Sound15MB1000

£259.50

Fs48 Hz +4%

Qts0.31 –

Vas132.5 L +16%

BL21 T·m −8%

Xmax6 mm −14%

Sensitivity98.6 dB +1.3

Sica15 S 4 PL

£300.59

Fs40 Hz −14%

Qts0.32 +3%

Vas127.6 L +12%

BL22.5 T·m –

Xmax10 mm +43%

Sensitivity95.8 dB −1.5

Sica15 K 4 PL

£305.62

Fs47 Hz –

Qts0.30 −3%

Vas102.3 L −10%

BL23.9 T·m +5%

Xmax8 mm +14%

Sensitivity97.2 dB –

Eighteen Sound15NCX910

£497.18

Fs55 Hz +20%

Qts0.33 +6%

Vas107 L −6%

BL21 T·m −8%

Xmax7 mm –

Sensitivity99.2 dB +1.9

Eighteen Sound15NCX910BE

No current price

Fs55 Hz +20%

Qts0.33 +6%

Vas107 L −6%

BL21 T·m −8%

Xmax7 mm –

Sensitivity99.2 dB +1.9

Eighteen Sound15NCX910N

No current price

Fs55 Hz +20%

Qts0.33 +6%

Vas107 L −6%

BL21 T·m −8%

Xmax7 mm –

Sensitivity99.2 dB +1.9

Oberton15MB35

No current price

Fs48 Hz +4%

Qts0.34 +8%

Vas115.1 L –

BL20.1 T·m −12%

Xmax6.8 mm −4%

Sensitivity97.6 dB –

Eighteen Sound15W1301

No current price

Fs48 Hz +4%

Qts0.32 +3%

Vas123 L +8%

BL22.3 T·m –

Xmax6 mm −14%

Sensitivity97.7 dB –

RCFMB15N405

No current price

Fs46 Hz –

Qts0.27 −13%

Vas124 L +9%

BL23.5 T·m +3%

Xmax7 mm –

Sensitivity98.4 dB +1.1

No photo

PHL Audio5021M

No current price

Fs32 Hz −30%

Qts0.30 −3%

Vas169 L +48%

BL24 T·m +5%

Xmax7 mm –

Sensitivity94.4 dB −2.9

Oberton15NMB500

No current price

Fs45 Hz –

Qts0.29 −6%

Vas128.0 L +12%

BL21.3 T·m −6%

Xmax7.8 mm +11%

Sensitivity97.9 dB +0.6

PeerlessNCP-1540R01-08

No current price

Fs54 Hz +17%

Qts0.32 +3%

Vas86.5 L −24%

BL23.9 T·m +5%

Xmax8.2 mm +17%

Sensitivity98.2 dB +0.9

FaneCOLOSSUS 15XB

No current price

Fs38 Hz −17%

Qts0.32 +3%

Vas168 L +47%

BL22.1 T·m −3%

Xmax7.5 mm +7%

Sensitivity96.4 dB −0.9

FaneCOLOSSUS 15SB

No current price

Fs41 Hz −11%

Qts0.29 −6%

Vas151 L +32%

BL22.5 T·m –

Xmax6.5 mm −7%

Sensitivity97.4 dB –

Oberton15XB1200

No current price

Fs40 Hz −13%

Qts0.31 –

Vas108.5 L −5%

BL23.9 T·m +5%

Xmax12 mm +71%

Sensitivity95.3 dB −2

Oberton15XB1201

No current price

Fs40 Hz −13%

Qts0.31 –

Vas108.5 L −5%

BL23.9 T·m +5%

Xmax12 mm +71%

Sensitivity95.3 dB −2

P.AudioP150/2227

No current price

Fs45 Hz –

Qts0.34 +10%

Vas117.9 L +3%

BL22.5 T·m –

Xmax5.5 mm −21%

Sensitivity96.9 dB –

Oberton15NXB1201

No current price

Fs38 Hz −16%

Qts0.32 +5%

Vas111.9 L –

BL23.6 T·m +4%

Xmax12 mm +71%

Sensitivity94.8 dB −2.5

Eighteen Sound15NTLW2500

No current price

Fs45 Hz –

Qts0.30 −3%

Vas143 L +25%

BL21.2 T·m −7%

Xmax8 mm +14%

Sensitivity98.3 dB +1

CelestionFTR15-4080HDX

No current price

Fs40 Hz −13%

Qts0.32 +3%

Vas111.2 L –

BL23.1 T·m –

Xmax10.1 mm +44%

Sensitivity95 dB −2.3

Search similar

Tune the match

Choose the published values that matter to your design. Size stays matched to this driver.

Qts

Qes

Vas

Xmax

Where to buy

Prices for delivery to the UK, including VAT. How prices work

Watch price

Shop	Price	Against the lowest	Stock	Link
Blue Aran Checked 25 Oct 2026 · 8 Ω · Source: inc VAT · 20% 6-8 weeks	£238.26		Usually available in 6-8 weeks	Visit shop at Blue Aran
Audio Video Parts Checked 25 Oct 2026 · Ships from Italy · 8 Ω · Source: inc VAT · 22% Import VAT and duty may apply	£195.60		Special order	Visit shop at Audio Video Parts

bits00 AUDIO

15-inch LF driver · 89 mm voice coil · 700 W

RCF MB15X351 8Ω

8 Ω · 40–2500 Hz

No price for delivery to the UK

All 2 offers

Open in 00 Simulator

Fs: 46Hz
Xmax: 7mm
SPL: 97dB
Pe: 700W
BL: 22.8T·m
Vd: 630cm³
Qts: 0.31
Vas: 114L

See all 26 specs

Specifications

Published by RCF

Manufacturer page

Datasheet PDF

The published T/S values agree with each other

Thiele/Small

Fs: 46Hz
Qts: 0.31
Qes: 0.33
Qms: 6.7
Vas: 114L
Re: 5.4Ω
Le: 0.90mH

Motor and cone

BL: 22.8T·m
Sd: 900cm²
Mms: 106g
Xmax: 7mm
Vd †: 630cm³
Voice coil: 89mm

Power and response

Sensitivity †: 97.3dB
Manufacturer sensitivity: 99dB
Power: 700W
Impedance: 8Ω
Min. impedance: 6.5Ω
Range: 40–2500Hz
EBP †: 139 · Leans vented

Size and mounting

Diameter: 393mm
Cutout: 354mm
Bolt circle: 376mm
Weight: 8.2kg

Other published values

Xmech: 40
Power Program: 1400

Sensitivity shows 97.3 dB, calculated from the T/S values. RCF publishes 99.0 dB, 1.7 dB apart.

† Calculated by bits from the published values

What this validation status means

Everything else RCF lists

LF · Primary · 15″

BL: 22.8T·m
Fs: 46Hz
Le: 0.90mH
Re: 5.4Ω
Sd: 900cm²
Mms: 106g
Qes: 0.33
Qms: 6.7
Qts: 0.31
SPL: 97.3dB
Vas: 114L
Xmax: 7mm
Xmech: 40
Power: 700W
Impedance: 8Ω
Sensitivity: 99dB
Low limit: 40Hz
Power Program: 1400
Calculated sensitivity †: 97.3dB
High limit: 2500Hz
Manufacturer sensitivity: 99dB
Min. impedance: 6.5Ω
Voice coil: 89mm
Weight: 8.2kg
Diameter: 393mm
Cutout: 354mm
Bolt circle: 376mm

Compare

Same-size drivers, compared with the MB15X351. Clear differences are green when better and red when worse.

This driverMB15X351

Best price

–

46 Hz

Qts

0.31

Vas

114 L

22.8 T·m

Xmax

7 mm

Sensitivity

97.3 dB

Power

700 W

B&C15CL76

£127.74

Fs42 Hz −9%

Qts0.33 +6%

Vas135 L +18%

BL21 T·m −8%

Xmax7 mm –

Sensitivity96.7 dB −0.6

SB AudienceROSSO-15MW500

£173.91

Fs42 Hz −9%

Qts0.33 +6%

Vas121.3 L +6%

BL23.2 T·m –

Xmax8.4 mm +20%

Sensitivity96.1 dB −1.2

CelestionCF1540HD

£175.00

Fs41 Hz −11%

Qts0.30 –

Vas108.3 L −5%

BL24.4 T·m +7%

Xmax10.5 mm +50%

Sensitivity95.6 dB −1.7

BMS15S330

£194.97

Fs39 Hz −15%

Qts0.32 +3%

Vas152 L +33%

BL23 T·m –

Xmax8 mm +14%

Sensitivity96.3 dB −1

B&C15PZB100

£199.99

Fs39 Hz −15%

Qts0.29 −6%

Vas110 L −4%

BL25.8 T·m +13%

Xmax8 mm +14%

Sensitivity95.4 dB −1.9

Precision DevicesPD.154C001

£219.00

Fs45 Hz –

Qts0.31 –

Vas128 L +12%

BL25.5 T·m +12%

Xmax8.2 mm +17%

Sensitivity97.4 dB –

Beyma15MC700ND

£226.76

Fs49 Hz +7%

Qts0.31 –

Vas105 L −8%

BL22.6 T·m –

Xmax7 mm –

Sensitivity97.6 dB –

Beyma14MC700ND

£229.73

Fs51 Hz +11%

Qts0.28 −10%

Vas78 L −32%

BL22 T·m −4%

Xmax7 mm –

Sensitivity97.4 dB –

Sica15 PF 3

£234.41

Fs45 Hz –

Qts0.31 –

Vas117.6 L +3%

BL21.9 T·m −4%

Xmax8 mm +14%

Sensitivity97.1 dB –

Eighteen Sound15NW530

£243.16

Fs43 Hz −7%

Qts0.33 +6%

Vas154 L +35%

BL22 T·m −4%

Xmax7.5 mm +7%

Sensitivity97.5 dB –

Eighteen Sound15MB1000

£259.50

Fs48 Hz +4%

Qts0.31 –

Vas132.5 L +16%

BL21 T·m −8%

Xmax6 mm −14%

Sensitivity98.6 dB +1.3

Sica15 S 4 PL

£300.59

Fs40 Hz −14%

Qts0.32 +3%

Vas127.6 L +12%

BL22.5 T·m –

Xmax10 mm +43%

Sensitivity95.8 dB −1.5

Sica15 K 4 PL

£305.62

Fs47 Hz –

Qts0.30 −3%

Vas102.3 L −10%

BL23.9 T·m +5%

Xmax8 mm +14%

Sensitivity97.2 dB –

Eighteen Sound15NCX910

£497.18

Fs55 Hz +20%

Qts0.33 +6%

Vas107 L −6%

BL21 T·m −8%

Xmax7 mm –

Sensitivity99.2 dB +1.9

Eighteen Sound15NCX910BE

No current price

Fs55 Hz +20%

Qts0.33 +6%

Vas107 L −6%

BL21 T·m −8%

Xmax7 mm –

Sensitivity99.2 dB +1.9

Eighteen Sound15NCX910N

No current price

Fs55 Hz +20%

Qts0.33 +6%

Vas107 L −6%

BL21 T·m −8%

Xmax7 mm –

Sensitivity99.2 dB +1.9

Oberton15MB35

No current price

Fs48 Hz +4%

Qts0.34 +8%

Vas115.1 L –

BL20.1 T·m −12%

Xmax6.8 mm −4%

Sensitivity97.6 dB –

Eighteen Sound15W1301

No current price

Fs48 Hz +4%

Qts0.32 +3%

Vas123 L +8%

BL22.3 T·m –

Xmax6 mm −14%

Sensitivity97.7 dB –

RCFMB15N405

No current price

Fs46 Hz –

Qts0.27 −13%

Vas124 L +9%

BL23.5 T·m +3%

Xmax7 mm –

Sensitivity98.4 dB +1.1

No photo

PHL Audio5021M

No current price

Fs32 Hz −30%

Qts0.30 −3%

Vas169 L +48%

BL24 T·m +5%

Xmax7 mm –

Sensitivity94.4 dB −2.9

Oberton15NMB500

No current price

Fs45 Hz –

Qts0.29 −6%

Vas128.0 L +12%

BL21.3 T·m −6%

Xmax7.8 mm +11%

Sensitivity97.9 dB +0.6

PeerlessNCP-1540R01-08

No current price

Fs54 Hz +17%

Qts0.32 +3%

Vas86.5 L −24%

BL23.9 T·m +5%

Xmax8.2 mm +17%

Sensitivity98.2 dB +0.9

FaneCOLOSSUS 15XB

No current price

Fs38 Hz −17%

Qts0.32 +3%

Vas168 L +47%

BL22.1 T·m −3%

Xmax7.5 mm +7%

Sensitivity96.4 dB −0.9

FaneCOLOSSUS 15SB

No current price

Fs41 Hz −11%

Qts0.29 −6%

Vas151 L +32%

BL22.5 T·m –

Xmax6.5 mm −7%

Sensitivity97.4 dB –

Oberton15XB1200

No current price

Fs40 Hz −13%

Qts0.31 –

Vas108.5 L −5%

BL23.9 T·m +5%

Xmax12 mm +71%

Sensitivity95.3 dB −2

Oberton15XB1201

No current price

Fs40 Hz −13%

Qts0.31 –

Vas108.5 L −5%

BL23.9 T·m +5%

Xmax12 mm +71%

Sensitivity95.3 dB −2

P.AudioP150/2227

No current price

Fs45 Hz –

Qts0.34 +10%

Vas117.9 L +3%

BL22.5 T·m –

Xmax5.5 mm −21%

Sensitivity96.9 dB –

Oberton15NXB1201

No current price

Fs38 Hz −16%

Qts0.32 +5%

Vas111.9 L –

BL23.6 T·m +4%

Xmax12 mm +71%

Sensitivity94.8 dB −2.5

Eighteen Sound15NTLW2500

No current price

Fs45 Hz –

Qts0.30 −3%

Vas143 L +25%

BL21.2 T·m −7%

Xmax8 mm +14%

Sensitivity98.3 dB +1

CelestionFTR15-4080HDX

No current price

Fs40 Hz −13%

Qts0.32 +3%

Vas111.2 L –

BL23.1 T·m –

Xmax10.1 mm +44%

Sensitivity95 dB −2.3

Search similar

Tune the match

Choose the published values that matter to your design. Size stays matched to this driver.

Qts

Qes

Vas

Xmax

Where to buy

Prices for delivery to the UK, including VAT. How prices work

Watch price

Shop	Price	Against the lowest	Stock	Link
Blue Aran Checked 25 Oct 2026 · 8 Ω · Source: inc VAT · 20% 6-8 weeks	£238.26		Usually available in 6-8 weeks	Visit shop at Blue Aran
Audio Video Parts Checked 25 Oct 2026 · Ships from Italy · 8 Ω · Source: inc VAT · 22% Import VAT and duty may apply	£195.60		Special order	Visit shop at Audio Video Parts