Big Al - 98 IB 4x4 5.2L w 3.55 [NC]
al-east@earthlink.net

As for the OEM amp's specs, I have no idea but can state that, with my equalizer set properly, this setup improved the sound quality tremendously - including a nice "clear" window/mirror rattling base if I crank it up. Others who've had the chance to personally heard my setup were "very" impressed with the sound quality and astounded that it was coming from the OEM amp and speakers!
It's obvious to me that the whole problem with the very poor OEM sound quality is the head unit and not the amp/speakers.