This is exactly where people start having trouble with their stereo install. A bad connection can work fine today and cause intermittent problems at a moment's notice weeks down the road. Don't take short-cuts on the connections.

The crimper I use for the tiny (by comaprison) DCI wire harness has a crimp force of 50-60lbs. When you're done it should take over 10lbs of pulling force to dislodge the 22 gauge wire from the terminal, and these are tiny terminals.

I'd guess that a 4 AWG terminal would take something in the 1000lb range to get a good crimp, and it should take well over 100lbs of pull to loosen the wire. If you can't support your weight on it, it ain't tight.

Since I don't have a crimper that size I'd solder it or like the guy said, get a screw-style terminal. For soldering you'll either need an industrial-sized soldering iron or a propane torch. Some of those small butane torches (not a Bic lighter) might work too. And liquid flux. Something this size needs more than the flux in the solder.

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You are definitely scaring me with talk of the industrial sized soldering iron.

I am going to use the screw on method.

BTW I just installed your DCI using a screw terminal.

It is an awesome upgrade. I hated the idea of losing the side controls.