Review on 📻 Pioneer DEH-S4100BT AM/FM Receiver with MIXTRAX, Bluetooth Dual Phone Connection, USB, Spotify & Pandora Control, iPhone & Android Music Support, Smart Sync App – In-Dash CD Player by Darin Grosz

Absolutely amazing, I have a lot of experience with head units and such and if you want to use some non-original speakers along with multiple amps and multiple subwoofers this is a great product. The only problem I have is that it has 2 RCA pre outs so unfortunately I can't connect RCAs to a 4 channel amp and mono. Well, I could use splitters, but RCA splitters are garbage and I wouldn't do that. Bluetooth worked perfectly, it's easy to do yourself if you know what you're doing and I would definitely recommend it to anyone. Definitely quality. Ooooh, one more thing, NOW for some of you having "alternator howl" and engine noise coming out of your speakers after hooking this up to an amp or just by itself, here's how to fix it (many car -Audio vendors will try to get it (You have to buy $100 RCA, but that's not usually your problem), all you have to do is take the ground (black wire) from your main unit and connect it to your connect negative or red RCA pin (only if you have an amplifier or RCA). and hook it up as you normally would and the sound will disappear as the RCA jacks are grounded through your amp. So the only way you can fix this is if you have an amp and an RCA, but other than my problem, great product, maybe it was just my car