The 30cm (12") 250W RMS 4Ω single voice coil MTX RT12-04 subwoofer is full featured: long throw excursion, rubber suspension, polypropylene cone with embossed MTX logo, large magnetic structure, extra large 50mm (2") voice coil, SPV cooling technology, ALDS technology, etc. Considering the price, it's a feat.

• Long Throw suspension for low distortion and high power handling
• One-piece cone with embossed MTX logo for the look
• Thick sheet metal frame (1mm) for more rigidity
• Large eXtra magnetic structure (130x25mm) for more power handling
• 50mm voice coil for more reliability
• Wires braided in the spider for more reliability
• Spider eXtra large for more Xmax
• Push connectors for better contact
• SPV technology for coil cooling
• ALDS technology for reliability and for low level detail and high level power handling

• Subwoofer diameter 30cm 12"
• Max power: 750W
• RMS power: 250W
• Sensitivity: 92.0dB / 2.83v / 1m
• Impedance: 4Ω
• Response: 20Hz - 500Hz
• Depth: 13.4cm

• Fs : 28,0 Hz
• Re : 3,20 Ω
• Z : 4 Ω
• Qms : 6,87
• Qes : 0,58
• Qts : 0,54
• Vas : 68 liters
• Mms : 164,53 grams
• Cms : 186 mm/N
• Bl : 12,78 N/A
• Sd : 510,71 cm2
• Vd : 0,740 liters
• Xmax : 14,5 mm
• Prms : 250 Watts
• SPL 2,83V/1m : 92,0dB

MTX wants you to enjoy your hearing for a long time. Excessive exposure to loud volumes can damage your hearing. The United States Department of Labor recommends not exceeding the following recommendations:

• 90db : maximum 8 hours / day
• 92dB : maximum 6 hours / day
• 95db : maximum 4 hours / day
• 97db : maximum 3 hours / day
• 100db : maximum 2 hours / day
• 102db : maximum 90 minutes / day
• 105db : maximum 60 minutes / day
• 110db : maximum 30 minutes / day
• 115db : maximum less than 15 minutes / day
• 120db : immediate danger, 0 minutes / day