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    Need help with tuning, specifically amp x-over settings...

    Well I am now using my amp x-over rather than my head units x-over and I have noticed alot better response. However, I want to see if there is anything I can do to tune it just a bit better. I have a PPI PC2600 (600X1 @4ohms) running to 2 12" Pioneer 305DVC's. They are in a sealed box, 1.0 cubes before displacement. My settings on the amp are LP filter on, x-over on and tuned to 80hz (as far as I can estimate) and the Q-bass, which is PPI's bass boost, is 3 clicks up (about an 8th of the way). My gain is at about 75%. Im having a couple issues with this setup. For one, it seems as though I've lost some of my low range frequency. Before it didn't "hit" as hard but got louder in the low freq. range. Secondly, I get a bit of distortion on high end frequencies. Not to mention, high range, rather than low range seems to dim my lights more. I am using my full range preouot from the headunit and its 4V while the amp sensitivity is 800mv to 12v. My eq on the headunit has bass all the way down, mid range +2 and highs +6. I have the bass output tuned to 80hz on the head unit as well. Sorry about all the details but I just wanted to make sure you can help me out and didn't want to leave anything out in case Im doing something wrong. If anyone can give me an advice it'd be great.
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    Ron Jon



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    Front stage: PG RSD 65cs Comps @ 80Hz - 24db slope (HP), drivers in the door, tweets in the sails
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    Re: Need help with tuning, specifically amp x-over settings...

    Forgot to mention 2 things. There is 3 buttons on the front plate of the amp. There are 2 for the Qbass Plus settings. These allow you to change the "width" of the bass response. Right now both these knobs are out meaning my bass is centered at 60hz with a narrow range of frequency boost. Im getting this right out of my manual so I don't really understand what it means. Also, the 3rd button is for a -12db sensitivity for use with high power (4V to 12V inputs). I have this button turned out which means its off. Anyways, maybe Im doing something wrong here too....



    - Source Unit -
    Pentium 4 1.8GHz
    Intel mobo w/integrated video
    512MB DDR
    SB Live powered by Kx w/full DSP control
    180GB HD (1x20GB OS, 1x160GB Media)

    - Audio Hardware -
    Front stage: PG RSD 65cs Comps @ 80Hz - 24db slope (HP), drivers in the door, tweets in the sails
    Sub stage: Pioneer 12" 305DVC @ 80Hz - 24db slope (LP), sealed ~ 1.5 cube (net) in the trunk
    Comp amp: PPI Sedona APA630IX
    Sub amp: Alpine MRP-M500

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    Re: Need help with tuning, specifically amp x-over settings...

    ttt.......



    - Source Unit -
    Pentium 4 1.8GHz
    Intel mobo w/integrated video
    512MB DDR
    SB Live powered by Kx w/full DSP control
    180GB HD (1x20GB OS, 1x160GB Media)

    - Audio Hardware -
    Front stage: PG RSD 65cs Comps @ 80Hz - 24db slope (HP), drivers in the door, tweets in the sails
    Sub stage: Pioneer 12" 305DVC @ 80Hz - 24db slope (LP), sealed ~ 1.5 cube (net) in the trunk
    Comp amp: PPI Sedona APA630IX
    Sub amp: Alpine MRP-M500

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    Re: Need help with tuning, specifically amp x-over settings...

    As for the distortion on higher frequencies, it sounds like the gain is just a little too high, you'll want to turn it down a little bit. Keep the bass setting on your head unit at zero, meaning right in the middle. If you can, turn the x-over on the head unit off and let the amp do all the filtering, that way you won't get any contradictory filtering. You can go a little higher on the bass boost, maybe two more clicks. If you can read up on the manual a little let us know a little more about the centering frequency buttons.



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