[. . . ] [. . . ] MH­412 speakers were designed to complement the Fender® MetalheadTM MH-500 amplifier, but they can be used with any professional quality instrument amplifier. * Read these instructions and your amplifier manual before making connections. SPECIFICATIONS PART NUMBERS 2282900000 (MH-412ST) 2282800000 (MH-412SL) Four 12" (30. 5 cm) steel frame drivers 1 3/4" (4. 5 cm) voice coils 54 oz (1. 53 kg) magnets 3/4" (1. 9 cm) 13-ply birch plywood 99 dB, 1 Watt - 1 Meter 400 Watts 4 1/4" High Current Input Jack VB = 5. 5 ft3 (155 L) (MH-412ST) VB = 5. 1 ft3 (145 L) (MH-412SL) DRIVERS CABINET Connecting MetalheadTM MH­412 Speakers SENSITIVITY Connect each MH-412 to a speaker output jack on your amplifier. Use standard speaker cable (16 gauge minimum) with 1/4" phone plugs . Connect a speaker impedance total that matches your amplifier's minimum impedance rating for maximum power output. CAUTION: Never connect a speaker impedance load less than the minimum rating of your amplifier to prevent damage to your equipment. [. . . ] [. . . ]