subs, cant figure it out

I just tried using the speaker level inputs on the amp. I tapped it from the door's speaker. There are two channel inputs but I only hooked up 1 channel to the speaker level input on the amp. I dont think that would make the difference would it? I didnt have a chance to try it since I have to rush to work.

I tapped the driver side front door speaker and hooked it up to the channel 1+2 speaker input on the amp and fixed the gains again. It sounds a lot better now but I think still could be better. Then I disconnected the speaker level inputs and used the sub preouts and I can barely hear the sub now. What is going on? The preouts dont have enough voltage coming out? Quick question, I am new to working with amps and stuff. For the speaker level input it has channel 1 and 2 so do I take it from 1 speaker or do I have take it from the front and rear or front left and front right? Thanks!

I recommend using a line out converter (available at your local stereo shop) to run rca's to your amp rather than high level inputs.  Use signal from both a left and right speaker.  Also do a search in here on setting gain.My ex once told me I have a perfect face for radio.

Sorry for being a noob, but why is that the better solution to take? I am going to the the line out convertor and tap my rear speakers left and right for sub. I assume that the speakers dont have to be disconnected to connect the line out convertor to it correct?

The high level inputs are typically not very high quality and can give you unpredictable results.  Using both left and right sides will obviously give you signal for both.My ex once told me I have a perfect face for radio.

Ok thanks, I just thought it was the same thing since I would be tapping the rear speakers > hi/lo convertor > amp. Thanks geepherder!