This is the JL one, I assume specs are similiar.With the amp I'm looking at it would only be about 75watts to each of the 4 channels. Would really like to know the specs on that factory sub. I don't think that will harm the factory sub and will just provide bass fill, not looking for tub ratling thump from it.
No need for a 4 channel. OP could do a Monoblock at 2 or 8 ohms.If your amp you are looking at is 75wx4 at 4ohms it will likely be 140-150wx4 at 2ohms, assume it’s 2ohm stable. Way too high for the sub, but with the gains turned way down it would definitely sound far better than the stock 45Wx4.
He could, but he stated he was looking at a 75wx4 which was the point of my response.No need for a 4 channel. OP could do a Monoblock at 2 or 8 ohms.