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I'm thinking about getting the Pioneer AVH-X5800BHS headunit for my 2005 Honda Pilot EX but I want to keep costs as low as possible, so can I use the stock subwoofer by tapping into the Sub+ and Sub- wires with some PosiTap connectors or will I have to buy a separate powered subwoofer. Is there an amplifier built in to the car or does the stock headunit amplify the signal inside the unit? I have heard that the subwoofer is 50W. I tried researching this but I got many mixed answers.

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The AVH-X5800BHS has a 70 watt channel dedicated to a subwoofer. This is good into 2 ohms, so this should work very well on your Honda Pilot.

AVH-X5800BHS Specifications

Refer to page 54 for wiring information for a subwoofer. Note that wiring depends on speaker impedance, so in your case you should see if the magnet is labeled, or measure DC resistance with a meter.

If you are unsure about the wiring, you should google or go to Crutchfield to locate a specific harness adapter for your head unit and specific vehicle. This will not only save a lot of time, it leaves the OEM stock harness intact, in case you ever change again or even change back to stock for resale.

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  • So, to clarify I can just breakout the RCA jack and connect it up directly to the sub + and - pins with the positap connectors?
    – p7810456
    Aug 16, 2016 at 5:03
  • @p7810456 No, not at all. The RCA jacks are for an external amplifier. I beleive your new head unit has a amp channel for a subwoofer already.
    – SteveRacer
    Aug 16, 2016 at 13:31
  • Resistance and impedance are different. The reading you get with a meter will not accurately represent the impedance of the speaker when a signal is running through it. It's best to look up the specs if you're concerned, but you will rarely if ever see a speaker impedance below 2 ohms, so I wouldn't worry about it.
    – Lathejockey81
    Aug 16, 2016 at 16:00
  • @Lathejockey81 agreed, but OEM specs are hard to find if it's not printed on the magnet. A DVOM reading will get you close enough to decide how to wire this installation. I wasn't concerned of going below 2 ohms, the amplifier section has two finals taps depending on whether the subwoofer is 2 ohm or 4 ohm and higher.
    – SteveRacer
    Aug 16, 2016 at 16:11
  • @SteveRacer so on the harness for the radio there will be a sub + and - that I could directly PosiTap onto the car's sub + and -?
    – p7810456
    Aug 16, 2016 at 16:23

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