INCLUDES: 4X 6MR250B-4 SLIM - 6.5" Midrange Bullet Slim Loudspeakers - 1000 Watts Package - 250 Watts Each The MR SLIM series was designed as PRO Audio On Wheels solution for shallow doors, featuring an Aluminum Phase Plug (Bullet). This mid is built like a professional midrange loudspeaker, but it has been designed for use in the mobile audio market, as we called it Pro Audio On Wheels!By combining elements from PRO Audio and Car Audio we have developed a NEW type of high efficient midrange that is able to give high levels of output from stock speaker location in your car.HighlightsSlim Design – Perfect for door stock locationSound Quality without Cutting up interior PanelsEndurance at Loudest VolumesVented Air pole piece for heat dissipationCenter phase plug for even sound distribution4 Ohms ImpedanceAlso available in 8″- 8MR250B-4 SlimThe “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 midrange 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 250 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 2.14″ of mounting depth without sacrifice quality and performance.GENERAL SPECIFICATIONSNominal Diameter6″ (152 mm)Nominal impedance4 OhmNominal Power Handling*125 WattsContinuous Program Power (RMS)**250 WattsMax Peak Power***500WattsSensitivity 2.00V at 1m93.5 dBRecommended Hi Pass Crossover For Full Power Handling145 Hz 12db Per Octave CrossoverFrequency Response145 – 8,000 HzVoice Coil Diameter1.5″ (38 mm)Voice Coil WireCCAWVoice Coil Winding Depth9.5 mmFormer MaterialKaptonMagnetic Gap Depth6.0 mmFrame MaterialStamped Steel THIELE-SMALL PARAMETERSEquivalent VolumeVas4.0 lExcursion (mathematical)***Xmax3.25 mmFree Air ResonanceFs142.9 HzMechanical FactorQms28.73Electrical FactorQes0.85Total FactorQts0.82Cone AreaSd143 cm²Mechanical MassMms8.89 gBl FactorBl5.82 TmDc ResistanceRe3.6 OhmsInductanceLe0.135 mH at 1 kHzMechanical Mass Without AirMmd7.92 gMechanical ComplianceCms0.139 mm/N EXTRA INFOOverall Diameter6.50″ (165 mm)Front Mount Baffle Cutout5.67″ (144 mm)Mounting Depth2.14″ (54.5 mm)Overall Depth2.38″ (60.5 mm)Net Weight3.53 Lbs (1.60 kg)Shipping Weight3.96 Lbs (1.80 kg)Carton Dimensions W x L x H6.89″ x 6.89″ x 2.95″ (175 x 175 x 75 mm)