8" 50W Complete Bass Kit

I still drive an '89 Cougar, which came with a JBL Premium sound "package." (Premium JBL speakers and subwoofer, built-in CD player, cassette player and AM/FM radio.) After 10-12 years, the CD player died, after that, the rear-deck subwoofer died (which I removed shortly afterword,) and about a year ago, the right channel output died as well. I bought the Bazooka to replace the JBL unit, thinking it would be a fairly straight-forward process. In actuality it is, but I didn't know that at first. If you're like me, and haven't worked on anything like this for a while, you might want to read up on current car-stereo technology. (Although I couldn't find a decent explanation of the following...ANYWHERE!!!!) I know I will be laughed at for this, but I couldn't figure out what that extra POWER CONNECTION wire was for, or how it operated, and I had one heck of a time getting any information about it at all. It's described as a trigger wire of some sort, but that didn't give me enough detail, so I remained ignorant for quite some time. (Why would I need TWO 12-volt DC power connections to the Bazooka??????) That "extra" POWER CONNECTION is nothing more than another 12-volt DC connection that delivers power ONLY to a relay switch INSIDE the Bazooka. (That relay then connects the MAIN 12volts power line to the internal amplifier) The part I didn't get was that the extra "trigger wire" ONLY provides that power when you turn your ignition key on, OR when you turn your stereo head-unit on, OR when your power antenna is energized. These options all depend on your existing equipment, and how you decide to wire everything up. Most modern head-units have a DC power wire to connect this "trigger wire" to, and if not, you can use the antenna connection, or a connection at your ignition switch or fuse-box. Another detail that nobody under the sun would explain to me, is that this extra wire CONTINUES to deliver 12volts to the internal relay for as long as your ignition is on, or your radio is on, or your antenna is energized. (Again, depending on how you hook things up.) That extra 12volts, holds the Bazooka's internal power-relay closed, to allow the MAIN 12volts from the battery to drive the Bazooka's internal amplifier. Again, my first instinct was to question why I would need two supplies of continuous 12volts DC. It just didn't make sense to me. I now know, that when the relay power is off, the main connection goes off as well, making sure that you don't drain your battery when the unit is not in use. NOTE; The Bazooka also comes with an auto-on feature which will turn on the main power when there is an audio signal through the audio inputs. I haven't tried this, as I read a few complaints that the connection was too intermittent. I prefer a much more positive method for providing main amplifier power. Other than all that confusion, I DID get to temp-test the Bazooka (mounted in my trunk,) with my crippled JBL head-unit, and it worked perfectly. (Better than the original JBL subwoofer I'd say, and with considerably more power.) The only issue I had was some thumping as I used my brakes etc., but that should be fixed when I run the main power connection directly from the battery wire. I also bought a new Pioneer head-unit from Amazon, and I'm still in the middle of the installation. When I finish, I will edit this review and give some more information about the Bazooka. I've been a highly placed professional in the audio business for multiple decades, so I hope that some will find my opinion useful.