Advent Factory OEM Tweeter, Baby II, Graduate, P099-20110 Original Advent replacement tweeter Specs: Size: 4" x 3", Hole cut-out: 2-1/8", Voice coil: 1/2" Ferro Fluid Cooled, Magnet: 3 oz, Impedance: 6 ohms, Re: 4 ohms, Power: 40 watts RMS, 80 watts max, Response: 4 kHz - 20 kHz, Sensitivity: 86 dB Factory AUTHORIZED service and parts. FREE technical support. SUPERIOR quality, LARGEST selection, and the BEST prices!