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Thread: Audio Question

  1. #1

    Audio Question

    Anyone out there with in depth knowledge of amplifier/audio system setups?

    I currently have an Alpine MRV-F300 with the following 4 channels setup;

    CH1 - Kenwood 6.5" 100W max/ 75W RMS(4ohm) and Kenwood 6.5" 150W max (4ohm) *I believe these are run in parallel inside the gunwale.

    CH2- Kenwood 6.5" 100Wmax? 75W RMS (4ohm) and Kenwood 6.5" 150W max (4ohm) *I believe these are run in parallel inside the gunwale.

    CH3- (2) Tower speakers each 200Wmax (4ohm)


    CH4- (2) Tower speakers each 200Wmax (4ohm)

    I am currently in the process of rewiring the Tower Speakers inside the tower instead of zip tied to the tower. My question is what is the best way to wire the tower speakers, in series or parallel?

    Are the 6.5" speakers best left alone or should I be concerned with the setup? -I was not planning to do anything with these right now.

    I understand the basics of car audio but I get lost in all the amplifier ohm calculations, hoping someone with more experience can point me in the right direction.

    EDIT- I guess the other option, although much more work, would be to rewire the (4) cabin speakers directly to the head unit and run each of the (4) tower speakers to each of the amp channels. That is probably how I would have done it, had I installed the system myself but I am hoping that the other person had a good reason to do it the way they did.
    Last edited by JTrottaNY; 03-28-2017 at 12:33 PM. Reason: MORE INFO


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    mr_video's Avatar
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    Titan_Joe's Avatar
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    If the amp is 2ohm stable you want to run them in parallel. If you were to wire the speakers in series your amp would only see a 8ohm load and put out very little power. IE If you amp is rated at 100 watts rms @ 4 ohms it would put out roughly 200 watts rms @ a 2 ohm load and approximately 50 watts rms @ a 8 ohm load

  4. #4
    These are the amp specs from the Alpine website;
    Power Rating: 50W x 4 (4Ω, 14.4V, ≤1% THD+N), 75W x 4 (2 [email protected]) S/N 98dBA (Ref. 10W into 4Ohm)

    Not exactly sure why it lists both 50W (4ohm) amd 75W (2ohm)...

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    Titan_Joe's Avatar
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    Quote Originally Posted by JTrottaNY View Post
    These are the amp specs from the Alpine website;
    Power Rating: 50W x 4 (4Ω, 14.4V, ≤1% THD+N), 75W x 4 (2 [email protected]) S/N 98dBA (Ref. 10W into 4Ohm)

    Not exactly sure why it lists both 50W (4ohm) amd 75W (2ohm)...
    When you paralell two 4 ohm speakers together you create a 2 ohm load, so each speaker will see 35 watts continuous 70 watts peak. It would be fine to parallel the two speakers together, you have to be gentle on the volume knob though. If you turn up the volume too much your amplifer will start clipping (dirty power) and you will easily fry your speakers. It is always better to have too much power than not enough. I had a 15k audio system in my last truck and i was running 3 way components. I was feeding 400 watts rms of clean power to each of my midbass drivers alone.

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