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  1. Request for help on Amplifier protect mode

    General Car Audio Discussion
    ^^^exactly what I'm thinking. The amp turns on right before the inrush of current to the starter motor, so it senses a low-voltage condition and goes into protect. I've never seen it happen or even heard of it happening to anyone, but it's plausible. What are you using as a remote turn-on for...
  2. The importance of left-right symmetry in subwoofer and port placement

    General Car Audio Discussion
    Frequency response will not be the same at every point in the cabin due to the modal response caused by the geometry of the sub/port/listening position/physical boundaries of the listening space. If your head is in a node or antinode of a certain frequency you will get a cancellation/boost...
  3. Alternator whine from the depths of HELL!

    Technical & Advanced Car Audio Discussion
    With the RCA's disconnected, ground the RCA input shield to the - terminal on the amp. See what happens. It should stop.
  4. Coaxial vs components... phase and timing?

    Technical & Advanced Car Audio Discussion
    Bingo Getting the drivers to be as coincident as possible increases the smoothness of the power response and provides more uniformity as you move your head around (or sit in different positions). That's not to say a coaxial is always going to be good at this, but it should be much better. If...
  5. Kia forte speedometer

    Technical & Advanced Car Audio Discussion
    Thanks for the follow up post. You never know when someone 1/2/10/etc years in the future will have the same problem, do a search, and come across this post.
  6. Any Disadvantage to Two Power Wires instead of a Larger one with D Block?

    General Car Audio Discussion
    in no order: -it doesn't matter how you run your wire as long as the entire length from source to load is adequately sized and fused appropriately. -don't mix batteries. Just don't. It will technically work, but you reduce the life of the bank and you probably won't see any gain from just...
  7. Did I just kill my bass?

    General Car Audio Discussion
    Putting subs anywhere near the middle of the vehicle away from boundaries almost always reduces efficiency below 40-50hz at the listening position. For a bit of fun, climb into the hatch and listen to the system with your head on the floor near the tailgate. There will probably be a noticeable...
  8. left side tuning measurement

    General Car Audio Discussion
    Are those measurements of different sides? You said you don't have the lt side tweet but I see two tweet measurements so are some of them pre/post EQ? In any event, those all look workable. The mids look fine, perhaps just pay attention to getting the crossover region between the mid/midbass...
  9. Minimal budget components for a friend

    System Design: Help Me Choose Equipment For My Car
    I cant' really comment on particular gear, but I suggest that if you want to DIY a set you buy all of that stuff first. If it doesn't sound too hot relegate them to the rear and go with a proven pre-built set for the fronts. You might also consider going tweeterless in the rear. A well damped...
  10. DIY Lithium Titanate (LTO) battery bank

    Build Logs & Project Install Gallery
    Very cool! I've been keeping an eye on lithium (in all it's variants) for a while now waiting for prices to drop and to hear real-world stories of use. I've stuck with traditional AGMs but it looks like in the next few years it will be time to rethink my bank. Thanks for sharing!
  11. Predicting good transient response

    General Car Audio Discussion
    First let's start out with defining some things. Perfect transient response is a perfect 1:1 input/output in the time domain across all frequencies. If the amp puts out a signal at 20hz and 1mS later the sub produces it, but at 40hz it takes 2mS, you do not have perfect transient response. If...
  12. Post your sub FR

    General Car Audio Discussion
    You would probably need to add a ton of mass to the disconnected speaker to extend the FR. With it just disconnected you will get a ton of cancellation on the low end and a large peak wherever the mass of the disconnected driver resonates. It will do the opposite of what you want. But....you...
  13. left side tuning measurement

    General Car Audio Discussion
    Agreed with Erin. The "null" at 80hz might look like that because of the large spike at 60hz. If you have anything in the car plugged into the wall you might see that 60hz bump; I used to get it with my old laptop when I was measuring. Definitely try measuring at a higher volume as well - around...
  14. Actual Impedence?

    General Car Audio Discussion
    As Holmz points out, the measurement given by the manufacturer (and what you would measure with a multimeter) is a "nominal" resistance. It will change quite a bit at different frequencies, and not only that but the enclosure will change the impedance profile as well. Because of this, it's...
  15. How big does aperiodic vent really need to be ? IB vs AP and road noise

    Technical & Advanced Car Audio Discussion
    If you have the ability to EQ down any peaks from having the sub in a small sealed enclosure you should probably try that first. You should have plenty of power to overcome the cuts you'll need to make, especially for something you're not designing for all-out SPL. Picking a sub with a...
  16. anyone willing to model something big for me?

    Technical & Advanced Car Audio Discussion
    In order to get that low you will need a large enclosure. I'll try to describe the first graph that was posted, (the one you were referring to when you told the poster you are blind). All sizes were tuned to 33 hertz. In 12 cubic feet, the roll-off starts at around 50 hertz and is down by about...
  17. Weird cutoff at 4K with UMIK-1 USB and REW

    General Car Audio Discussion
    Make sure the test signal (PN or sweep) you are using isn't band-limited.
  18. is an amp just an amp?

    Technical & Advanced Car Audio Discussion
    If you are testing the amps on two different speakers in two different locations relative to the seating position it's not surprising they sound different. The reason you don't see people trying this, and why you see people making dramatic claims about the difference in the sound...
  19. How big does aperiodic vent really need to be ? IB vs AP and road noise

    Technical & Advanced Car Audio Discussion
    Those old designs were (typically) for midrange speakers. The AP helped damp the lower midrange/bass region because many of those speakers were high Q which have a tendency to be boomy in standard enclosure alignments. For a pure subwoofer they would work, but you'd still be getting a lot of...
  20. Almost Accidental SQ Period Build

    General Car Audio Discussion
    Those Boston Z's are really nice. Definitely one of my favs, although I haven't heard them in probably 15 years or whenever they first came out.
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