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Thread: Newbie mac audio question

  1. #11
    tkn
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    So sdashiki, you have software that does time correction, or you know for a fact that some devices come with it? I just emailed M-Audio to find out if the Sonica Theater does it, so I guess we will see.

  2. #12
    FLAC sdashiki's Avatar
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    My M-Audio Revoltuon 7.1 PCI-X came with it.

    In my experience, it HAS to come with something like that. WTF is the point of getting your carputer to output 5.1 sound with no way of controlling it...

    for someone who seems to be "on top of his game when it comes to time correction" you should already know this.
    (All done)
    iPad Mini 128GB, RF 600.5 amp, JL12W0V2, 8 Infinity Components

  3. #13
    tkn
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    No need to be a dick.

    I might know what time correction is without ever having looked into Mac solutions for it. It's too bad people on this board seem so hostile. Time correction/alignment isn't standard on all AV receivers so how am I supposed to know what the software for a product I haven't purchased has.

  4. #14
    Maximum Bitrate techy101's Avatar
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    I'd recommend just doing it through your Head Unit. Get a good head unit, like the Alpine 9855 and you have a 5 band fully parametric EQ(not the crappy semi's that come with Pioneers) or a 13 band Graphic, and full time alignment functionality, down to 100'th of a second. And fully customizable crossovers.

    If you want more detailed than that, like doing a FULL component time alignment, and driver alignment then you'd want to look into a processor. Like the Alpine PXA-H900 but that will run you a good $3,500+. Which IMHO seems pretty damn pointless unless you're building a SQ Competition car.

    But I do not recommend doing your time alignment through PC software. Mainly because there is a propagation delay in your HU (If you're using one) and in your amplifiers. The HU/Proc. will be designed with this in mind.

    Also, as far as EQing goes. Do it by your own ears. Working in the PA (concert, theatre, and corporate) world, I have yet to hear a system that will sound as good EQing itself as it will by being hand tuned. Main reason for this, is that it only hears what the sound is like where the microphone is placed, and has no clue what things like Nodes, Anti-Nodes, Comb Filtering, etc... are. Say you place the mic in an area that has MAJOR comb filtering. and Say that one of the damages areas is 125Hz. It will try to adjust for that by boosting it up, but will never be able to fix the problem because it is a time based problem (due mainly to reflections in the car) So you end up with a car that has TONS of 125 through 80% of the car, but you still can't hear it at the drivers seat.

    And as for the auto time correction, same thing applies. In such a reflective environment your Proc will have a very hard time knowing when something is a reflection, or it's the primary Impulse Response.

    Just my $0.10

    Best of luck with getting your system sounding great. and keep us posted on your progress.

  5. #15
    tkn
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    Thanks for your very informative post. I think that auto-EQing is a start. My friend with his home theater receiver basically did the auto-EQing in his house multiple times keeping track of the settings and essentially averaged them to get a more accurate sound everywhere.

    I just heard from M-Audio and they said that there is software to do it, so I might experiment before buying a dedicated processor. It would be nice to have the computer do it instead of adding another piece of equipment, but I am cognizant that there may be insurmountable issues with the whole thing.

  6. #16
    Newbie svhall60's Avatar
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    Quote Originally Posted by techy101
    I'd recommend just doing it through your Head Unit. Get a good head unit, like the Alpine 9855 and you have a 5 band fully parametric EQ(not the crappy semi's that come with Pioneers) or a 13 band Graphic, and full time alignment functionality, down to 100'th of a second. And fully customizable crossovers.

    If you want more detailed than that, like doing a FULL component time alignment, and driver alignment then you'd want to look into a processor. Like the Alpine PXA-H900 but that will run you a good $3,500+. Which IMHO seems pretty damn pointless unless you're building a SQ Competition car.

    But I do not recommend doing your time alignment through PC software. Mainly because there is a propagation delay in your HU (If you're using one) and in your amplifiers. The HU/Proc. will be designed with this in mind.

    Also, as far as EQing goes. Do it by your own ears. Working in the PA (concert, theatre, and corporate) world, I have yet to hear a system that will sound as good EQing itself as it will by being hand tuned. Main reason for this, is that it only hears what the sound is like where the microphone is placed, and has no clue what things like Nodes, Anti-Nodes, Comb Filtering, etc... are. Say you place the mic in an area that has MAJOR comb filtering. and Say that one of the damages areas is 125Hz. It will try to adjust for that by boosting it up, but will never be able to fix the problem because it is a time based problem (due mainly to reflections in the car) So you end up with a car that has TONS of 125 through 80% of the car, but you still can't hear it at the drivers seat.

    And as for the auto time correction, same thing applies. In such a reflective environment your Proc will have a very hard time knowing when something is a reflection, or it's the primary Impulse Response.

    Just my $0.10

    Best of luck with getting your system sounding great. and keep us posted on your progress.

    I checked out your picture - nice system and install. 2 screens for ? can they function apart from one another.

  7. #17
    Constant Bitrate
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    how about this?

    I think I found just what you are working for, it works great in my home theater but it does use a bit of processor power. http://www.versiontracker.com/dyn/moreinfo/macosx/25618 here!

  8. #18
    Maximum Bitrate techy101's Avatar
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    Don't forget that if you want to do these things software based, you will need to have a sound card that outputs 4 seperate channels, and allows you to modify them independentally.

    As for making my screens function apart from each other, what do you mean. (It's a Wintel machine btw, but I enjoy poking around the Mac forum) The system is set up as a split screen display. It's just a dual head video card with two monitors hooked up. So I can put whatever I want on each window. Does that answer your question?

  9. #19
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    Time Alignment

    Hey tkn,

    I do professional lighting and sound, so I know exactly what you are talking about. Theroitically it can't be done, but I believe there is a way to cheat it a little bit. You would have to get a program like audio hijack from rougue amoeba. You would have to copy the output either 4 or 5 times )depending on your setup) and then send each of those through a delay and parametric or graphic and then take like a firepod with 6 outputs and then send each one through that to each of your amp channels. I dont know if this can be done for sure, but I am sure you could contact rogue amoeba and they can help you with it.

    Another thing I have just recently found is a device from audiocontrol.com called DQSX which does 6 chs of eq but I dont think timing. http://mobileaudiocontrol.com/produc...47&l1=5247&l2=
    It is decently priced too..

    If you have the cash, you could always go for a professional product such as a BSS Minidrive processor which is a 2 in 6 out with parametric, time, phase, and xover.. All that in one.. only sets you back $1k though. There are also some rane things that you could get. The only bummer about all of this is it runs ballanced audio and powers from 110v.

    Hopefully thos helps.. Ryan

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