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  • Newbie mac audio question

    Is there anything that will let the Mac do time alignment and proper EQing? To me that would be a huge advantage for a carputer and it seems that I would end up spending some money to get that functionality another way otherwise...

  • #2
    Not sure. Probably my audio ignorance, but what do you mean my time alignment?
    Originally posted by ghettocruzer
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
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    • #3
      What is "EQing"?

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      • #4
        I really have no idea what yer talking about...

        time alignment? WTF is that.... are you talking about audio/video sync?

        EQing? You mean having access to an equilizer? Built into iTunes, that not good enough for you? There are no front ends yet, so asking someone to put an EQ into it, wouldnt really help yet.

        EDIT: i googled time alignment and got it, you mean the distance of speakers. You want something that will thru digital processing give you a better soundscape by dialing in the distance of the speakers to your ears.

        if you use a third party audio thing, like a PCI card or firwire breakoutbox, they usually come with a software interface for setting up your system and setting the distance/height etc of each individual speaker.

        again, this is really techincal and not implemented (or planned to be) in any of the work in progress OSX front ends...
        (All done)
        iPad Mini 128GB, RF 600.5 amp, JL12W0V2, 8 Infinity Components

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        • #5
          Explanation

          Time alignment or time correction is the ability to delay specific channels so that you can compensate for speakers being at different distances. So the passenger side tweeter which might be twice the distance from the driver's side one might emit sound a few milliseconds earlier to adjust for the difference in distance.

          Real EQ versus the BS that iTunes has would sample sound from your car, determine which frequencies are being over and underemphasized by the layout of the speakers and the car and then compensate properly.

          Alpine, Clarion, JVC, Pioneer and others all make high end units that can automatically set up and adjust the sound to compensate for these problems for more accurate sound. There apparently is PC software available to do this, but I have not been able to find anything on the mac side.

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          • #6
            So you want to run something constantly in the background of your OSX front end that is constantly doing this for your music? Or you want something to be able to set it and forget it forever...

            Real EQ vs BS... i dont understand, a software EQ of any type is still an EQ.

            You are really talking about stuff that really, IMO, has a place in Home Theatre design. While it is cool to try this in the carputer situation, you really wont find that your sound experience has gotten any better. How could it... your are in an airtight volume that is smaller than most closets....and what about when the windows are down, what about just the back left window halfway down, that ruins your soundscape....

            Im sure there is a piece of mac software that will give you control over your audio not just thru iTunes. But again, the mac audio out is NOT multi channel. Unless we are talking about the optical out on the G5s...

            Anyway, whatever you use to get multi channel audio out of your Mac will come with its own software to do what you are looking for. I think.
            (All done)
            iPad Mini 128GB, RF 600.5 amp, JL12W0V2, 8 Infinity Components

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            • #7
              It really need only be set once with profiles for when there are two passengers. I think it has more of a role in car audio where you have no real control over speaker placement or room dynamics. There is software available to do so on the PC side, but since I would never use a PC if I didn't have to, I am merely trying to find out if there is anything on the Mac side.

              Obviously car audio people generally agree as it is built in on many head units. The JVC SHX850 has a microphone you put in your car where it will automatically set the EQ and time settings.

              Basically I am trying to maximize the sound quality that my future car computer will have. Better to evaluate in the planning stages my option.

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              • #8
                Gotcha. Well, it doesn't come built in to the Mac, or with the Mac software. It would be an add-on if it exists.
                Originally posted by ghettocruzer
                I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
                Want to:
                -Find out about the new iBug iPad install?
                -Find out about carPC's in just 5 minutes? View the Car PC 101 video

                Comment


                • #9
                  if you are that serious about this stuff then perhaps its best you look at recievers like the alpine one red is using
                  Signature: [==||========] 20% complete

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                  • #10
                    Man u didnt even read my post.

                    If you have 4 speakers in your car thats cool.

                    your mac was built to see 2 speakers, with a line out.

                    So how the hell are you getting the rest of your channels? Ill tell you: you will buy a 3rd party item to make your mac output 4 channels or more. AND WITH that piece of equipment will come software to do yer speaker distance stuff.

                    You say there is a PC program to do this, but in the end ummm how can that work when a computer only comes with line out, and maybe sub out. Your program is letting you set distance and stuff for speakers that arent even connected to the computer.

                    Buy something to give you more outs for speakrs and it will have what you are looking for.

                    DONT keep your head unit if you dont have to.
                    (All done)
                    iPad Mini 128GB, RF 600.5 amp, JL12W0V2, 8 Infinity Components

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                    • #11
                      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.

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                      • #12
                        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

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                        • #13
                          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.

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                          • #14
                            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.

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                            • #15
                              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.

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