Need Help... Aftermarket Speaker/Amp Install

Discussion in 'Gen 3 Prius Audio and Electronics' started by Prius_BK, Jul 11, 2016.

  1. Prius_BK

    Prius_BK Junior Member

    Joined:
    Oct 3, 2013
    20
    12
    0
    Location:
    Cali
    Vehicle:
    2013 Prius
    Model:
    Three
    After I replaced all the stock speakers and installed an amp, I am hearing a hissing / white noise sound whenever I turned on the car. Any help would be greatly appreciated :)

    About the car:
    - 2013 Prius III (non JBL)
    - Stock HU
    - 2 Front Speakers are old / 2 Rear Speakers are new
    - Amplifier is new (Pioneer GM-D9605) GM-D9605 - Class D 5-Channel Amplifier with Wired Bass Boost Remote | Pioneer Electronics USA
    - Using PAC SNI-35 Line Out Converter (LOC) to connect amp to stock HU
    - Ran new speaker wire from speaker locations to amp, used LOC to run RCAs from HU to amp

    About the problem:
    - White noise / hissing when starting up the car
    - Noise is coming from all speakers

    Things I have tried:
    - Noise is the same while playing from Radio / Bluetooth / USB connection
    - Noise is the same when the audio is turned OFF
    - Connected to Speaker Level Input on the amp. The amp comes with speaker level input wires that I could use to connect directly to the amp instead of using the LOC. Using the amp Speaker Level Input did NOT fix the issue.
    - Testing ground connection of amp. I tested the ground wire for the amp with a voltage meter by measuring the resistance. I set my voltage meter to 200 OHM scale and the reading I got from the amp ground to battery ground was between 0.2 - 0.3 OHMS
    - Testing ground connection for HU. I received the same reading as above

    Im not sure where what to check next. I really prefer to keep the stock HU (mostly because I dont have the money to upgrade yet :cry:)
     
  2. Prius_BK

    Prius_BK Junior Member

    Joined:
    Oct 3, 2013
    20
    12
    0
    Location:
    Cali
    Vehicle:
    2013 Prius
    Model:
    Three
    I disconnected the RCAs from the amp and the noise reduced a good amount (not completely gone), then I reconnected the RCAs to the amp, and disconnected the RCA from the LOC near the HU, the noise didnt improve at all. So I am going to try a ground loop noise isolator (PAC SNI-1)
     
  3. se-riously

    se-riously Active Member

    Joined:
    Nov 25, 2010
    263
    114
    0
    Location:
    SF Bay Area
    Vehicle:
    2014 Prius Plug-in
    Model:
    Plug-in Base
    Can you also turn down the gain on the amp?
     
  4. Prius_BK

    Prius_BK Junior Member

    Joined:
    Oct 3, 2013
    20
    12
    0
    Location:
    Cali
    Vehicle:
    2013 Prius
    Model:
    Three
    Tried turning down the gain on the amp and LOC, the only time the noise was gone is when the gain was all the way down :(

    Thanks
     
  5. CoolPrius

    CoolPrius Active Member

    Joined:
    Apr 13, 2016
    218
    290
    86
    Location:
    Virginia
    Vehicle:
    2018 Prius c
    Model:
    Two
Loading...