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  1. Rockford Fosgate system diagnosis and performance

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    Where's the music coming from?
  2. Rockford Fosgate system diagnosis and performance

    Audio / Video
    Its been fun trying to get decent sound in a variety of old cars. The Triumph Spitfire was a tough one as there wasn't much space. All of the sedans were easy except for that you have to enjoy all the sound coming from the rear, which I probably could not settle for any more. I had an F150...
  3. Rockford Fosgate system diagnosis and performance

    Audio / Video
    I tried five different iterations of gain and cutoff frequency on the left side door, and tested each one for an hour or so with various songs. The passenger's door didn't sound all that bad in stock form and seemed to work well with the modified driver's door, so i decided to leave the...
  4. Rockford Fosgate system diagnosis and performance

    Audio / Video
    And then there is this bit of data, which is pretty wacky. This is the amp output only for the rear door channels. This is not referenced to the same level as the rest of the data, so it just shows relative response. Judging by my ears, the rear doors are at least 10 dB lower than the fronts.
  5. Rockford Fosgate system diagnosis and performance

    Audio / Video
    And here is some other reference data for anyone interested. View inside the R.F. power amp. This simple circuit was added after bypassing the DSP for the driver's door speaker only. This table shows the pinout of the amplifier external connectors. View is looking into the connector from...
  6. Rockford Fosgate system diagnosis and performance

    Audio / Video
    OK, I've finished work on this and am satisfied with the result. Here is my final plot.
  7. Rockford Fosgate system diagnosis and performance

    Audio / Video
    I did some twiddling with the driver's door amp. My first attempt didn't sound good. It needed more level. So, I moved the level up about 6 dB and the crossover up to around 3000 Hz and moved the high pass coupling capacitor up to about 50Hz and tried it again. It sounds better. I thought I...
  8. Rockford Fosgate system diagnosis and performance

    Audio / Video
    Yes, 10 speakers. I must have been thinking of driven channels, not total speakers.
  9. Rockford Fosgate system diagnosis and performance

    Audio / Video
    I agree with you about the dash speakers, and your decision to upgrade makes sense. However, I may not make a change to mine. I want to see how it comes out with the stock dash speakers and the upgraded door speakers along with the new crossover. My change to the power amp will be a simple...
  10. Rockford Fosgate system diagnosis and performance

    Audio / Video
    I have come to believe that there is nothing faulty about my audio system, that these plots show exactly how the designers intended the system to work. I have read that the acoustics have been tailored for the vehicle. Since this same amp is used in the Pathfinder and possibly another model...
  11. Rockford Fosgate system diagnosis and performance

    Audio / Video
    And, here is the response of the amp by itself.
  12. Rockford Fosgate system diagnosis and performance

    Audio / Video
    As an update, here is the frequency response that I measured from the R.F. head unit, with tone controls all set to 0.
  13. Rockford Fosgate system diagnosis and performance

    Audio / Video
    I read your thread on those dash speakers. You say that you measured your speakers and I assume you mean with a mic in your phone or something like that. Did you confirm that the door speakers went up to about 2000Hz? My left door speaker only went up to 250Hz and above that there was...
  14. Rockford Fosgate system diagnosis and performance

    Audio / Video
    Thanks for the info. I opened up my amp because I did not believe that the frequency response that I measured (shown in plots above) are what the designers intended. However, I have now determined that the DSP input is flat and that the DSP output does indeed have those frequency responses...
  15. Rockford Fosgate system diagnosis and performance

    Audio / Video
    Thanks Thanks, that is very useful info, and those figures make sense. I'm probing the amp right now to get some clues as to what is going on. This is a DSP based amp which makes it a bit more complicated, but honestly I don't think the DSP is where the problem lies. I'm looking at the PA...
  16. Rockford Fosgate system diagnosis and performance

    Audio / Video
    Latest data. I measured the level coming out of the head unit for the driver's side front channel. It has a much flatter response with a lot of bass boost and a bit of treble boost, but generally acceptable. This shows conclusively that the strange frequency response behavior seen at the...
  17. Rockford Fosgate system diagnosis and performance

    Audio / Video
    Perhaps I need to learn my lesson the hard way, but just throwing it all away and spending a lot of money to replace it all seems very wasteful and is not something that sits well with me. I don't need a great audio system. Heck, I didn't even notice a problem with this system until I had...
  18. Rockford Fosgate system diagnosis and performance

    Audio / Video
    This doesn't look good to me. There is a significant difference between driver and passenger door outputs. For a good amp, I expect a much smoother flatter response than I see on any of these curves. In this, the crossovers don't look like they are correctly positioned, and both of the door...
  19. Rockford Fosgate system diagnosis and performance

    Audio / Video
    Here is the updated curves showing both driver and passenger side door and dash outputs from the amp.
  20. Rockford Fosgate system diagnosis and performance

    Audio / Video
    No microphone is used. These are all conducted measurements. The setup uses a Hewlett Packard 8921A communications monitor as both the signal source and the audio voltmeter. The signal source is taken from Audio Output on the monitor and connected directly to Aux In on the dashboard of the...
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