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8" Mid Range Bullet Slim Loudspeaker

8MR400B-4 SLIM

In stock
  • 8″ Mid Range – 4 Ohms
  • Shallow Mount
  • 93.5 dB – 400 Watts
Get 20% OFF When You Add to Cart


In stock


SKU: 8MR400B-4 SLIM Categories: , Tags: , ,



6MR250B-4 SLIM, 8MR400B-4 SLIM


  • Slim Design – Perfect for door stock location
  • Sound Quality without Cutting up interior Panels
  • Endurance at Loudest Volumes
  • Vented Air pole piece for heat dissipation
  • Center phase plug for even sound distribution
  • 4 Ohms Impedance
  • Also available in 6″ – 6MR250B-4 SLIM

The “bullet” phase plug is made from pure aluminum acting as a radiator cooling system for the voice coil and machined to perfection for even sound dissipation. Beyond good looks, this cone is extremely light, providing excellent damping to keep an incredibly natural yet accurate sound.

Also featuring a cloth M-roll surround helping resonance to be kept under control making for an easy transition to a super tweeter.


The suspension design of this mid range features the single layer spider – which connects to the coil former with premium stitched lead wires, all being driven by a copper-clad aluminum wire voice coil providing high efficiency and excellent power handling.

You can expect outstanding sound stage quality and realistic sound reproduction for a great value.

Built for compact spaces and able to handle 400 watts of continuous power. Its slim design makes this the perfect car audio door speaker, allowing it to be utilized in endless ways.

Loud and clear vocals all within 2.68″ of mounting depth without sacrifice quality and performance.

Technical Details


Nominal Diameter 8″ (152 mm)
Nominal impedance 4 Ohms
Rated AES Power Handling (RMS) 200 Watts
Program Power 400 Watts
Sensitivity 2.83V at 1m 93.5 dB
Recommended Hi Pass Crossover** **For Full Power Handling 125 Hz** **12db Per Octave Crossover
Frequency Response at -10dB 95 – 7,500 Hz
Voice Coil Diameter 1.5″ (38 mm)
Voice Coil Wire CCAW
Voice Coil Winding Depth 9.5 mm
Former Material Kapton
Magnetic Gap Depth 6.0 mm
Frame Material Stamped Steel


Equivalent Volume Vas 15.7 l
Excursion (mathematical)*** Xmax 3.25 mm
Free Air Resonance Fs 92.9  Hz
Mechanical Factor Qms 25.53
Electrical Factor Qes 0.76
Total Factor Qts 0.74
Cone Area Sd 230 cm²
Mechanical Mass Mms 13.78 g
Bl Factor Bl 6.34 Tm
Dc Resistance Re 3.8 Ohms
Inductance Le 0.167 mH at 1 kHz
Mechanical Mass Without Air Mmd 11.81 g
Mechanical Compliance Cms 0.213 mm/N

***Xmax=(Voice coil winding depth-Magnetic Gap depth)/2+ Mgnetic Gap Depth/4


Overall Diameter 8.23″ (209 mm)
Front Mount Baffle Cutout 7.13″ (181 mm)
Mounting Depth 2.68″ (68 mm)
Overall Depth 2.95″ (75 mm)
Net Weight 5.10 Lbs (2.30 kg) unit
Shipping Weight 5.50 Lbs (2.50 kg)
Carton Dimensions W x L x H 8.66″ x 8.66″ x 3.62″ (220 x 220 x 92 mm)
WARNING: Cancer and Reproductive Harm – www.p65warnings.ca.gov

Customer Reviews

Based on 16 reviews
Jorge Rivera

Super cool

Great speakers for the price

Installed them in my vehicle 2 weeks ago and I am impressed by the midbass and clarity of these drivers. Only thing I wish was that PRV included the low pass filter crossover point for the drivers in addition to the high pass information which they provided.

James Byars

They sound amazing.

Miguel Bencomo

Awesome speakers

Roger Young

Awesome products

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