XFLOC2 2-Channel 80W Line Output Converter with Digital Noise Filter and Line Driver

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Using this to add a subwoofer to a factory head unit. Makes it very easy compared to removing the head unit as you only need to tap into the rear or rear door speaker wires (rear speakers usually always receive full bandwidth). If your amp has a high-level input, you don't have to use this LOC. This one works great but remember to turn the adjustable level up all the way. Hope it will last, but I will try to edit this if it stops working prematurely.

I added a subwoofer to a G37 Convertible using a wire tap from the rear 6x9's and it works very well. This allows the factory head unit to utilize the bass adjustment from the Bose system to work just like having a separate subwoofer volume control. It's a quality product. I'm going to be using more NVX products. Sound quality is fantastic and the input controls work extremely well. I'm 100% pleased with this product.

Installed two different times have no problems I even shorted a wire on accident and it still works to this day

Nvx has always impressed me with their products, simple l.o.c. I do really like that it has a remote turn on wire for the amp so that's one less wire to run to the front