01 acura cl bose audio help?

So all 4 speakers worked until a stereo place installed a high low converter on my back left speaker to connect a amp and sub to my factory head unit, but it only worked for less then a day. Now I have no sound in my left speaker I even bought new speakers and the amp and sub don't get power either. Any ideas what happened and how I can fix it. Thanks

Budget SPL Subwoofers? Soundqbued? American Bass?

I am looking for some spl subwoofers that are priced pretty well. Looking to get some 15's, and need the price to be under $200 each! SQ is always nice but im looking for spl. So far the best brand looks like Soundqubed (audioque), and I recently saw some videos on the American Bass XFL's and those seem nice to. Any other suggestions? Which is better between the soundqbued and american bass? Thanks! (If anyone gives a good answer I'll give them 15 points)

Whats a good package for a sub/amp combo?

I want a reliable subwoofer (15") that wont blow but a reasonable price ($100-$300) along with a good amp that would hit hard but sound good as well and im also lost along the lines of ohms if anyone can simplify that for me that would be awsome, and maybe a few brand of good wires?

upgrading audio technica lp120?

I have bypassed the internal preamp on my system with the Cambridge 551p. Sounds better to me. Also installed a at120e. Sounds great to me. Changed to a rubber mat. Sounds great too. I have my system connected to my denon dm39 with qi speakers and so it is hard fir me to imagine getting a better sound. I won't rip out the preamp because I have no problem with the sound. Anyone agree with what I have done?

I am going to college not knowing what i want to do with my life I first wanted to become a car seller but then that seems to easy to do so i was wondering what should i do. I like cars but know nothing about mechanic or engineering or design for that matter. i also have a passion for motorcycles but idk what to do help should i just stick with being a car sales man??