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Thread: Alpine PXA-H701 Questions

  1. #311
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    Quote Originally Posted by bblitz View Post
    Having read posts about this exact issue, but without first-hand experience as of yet: it seems that you can use the HU as a master volume control for all auxiliary inputs.
    Do you mean the auxiliary inputs connected to the HU or some connected to the H701?
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  2. #312
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    I was thinking a cheap used Alpine AI-net HU connected to the H701 through the AI-net cable and a used CHA-S624 changer (has optical out) can be connected to the H701 with the AI-net cable but not the optical cable. Then I could set the HU input to changer and then connect whatever optical SPDIF device I wanted to into the H701. I think the H701 would just assume it was the CD changer hooked up optically and then allow the HU volume knob to act as a master volume control for the optical device.
    1999 Black Pontiac Trans Am
    CarPC's in F-bodies
    How To Relocate Climate Controls on the 97-02 F-body Cars
    (AMD Sempron 3000+, Opus 150)
    Car PC system is out, Alpine system is in.

  3. #313
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    Quote Originally Posted by JasonWW View Post
    I was thinking a cheap used Alpine AI-net HU connected to the H701 through the AI-net cable and a used CHA-S624 changer (has optical out) can be connected to the H701 with the AI-net cable but not the optical cable. Then I could set the HU input to changer and then connect whatever optical SPDIF device I wanted to into the H701. I think the H701 would just assume it was the CD changer hooked up optically and then allow the HU volume knob to act as a master volume control for the optical device.
    The wiring diagrams for the H701 show the head unit and changer connected with both AI-net and optical for each. Doesn't that mean the AI-net connection is for control only? If that is the case, perhaps you could have the CD changer connect to the H701 with an RCA.

    Also, I do not know of a cheap AI-net HU that has its own inputs. I am planning on using the DVA-9861, which does not have any inputs. In response to TurboCAD's suggestion I bought an optical switcher so that I can turn off the optical signal to the H701. There apparently have been pc freezing issues that others have had when turning off the soundcard so as to make the optical output blank.

  4. #314
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    you don't need to get a changer to fool the alpine, how the 700 works is, it'll play the signal through ai-net, then when it detects light through the fiber optic it auto switches to that, I can select dvd or cd, the dvd will play & the audio for the dvd will play thru ai-net, then when i connect the pc in through the optical for the dvd it takes over & all sound is the optical, unplg the optical it switches back... on some occasions it wont auto switch back to the ai-net, all I have to do is switch source & switch back to resume ai-net

    it's when you want to use the dvd optical & the pc optical for example that the issues can come up, if you manually unplg one & plug the other it'll switch no problem, I did that for a while but was working on an auto switcher, I found a huge manual optical switch that worked, but I want to build a motorized one

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    another strange thing, I think all the optical inputs are tied togeather, I can put it in any one of the 3 & it'll play...

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    Which has better sound quality: AI-net or optical?

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    technically optical, in practical use there real close, but you can hear the cleanliness of the optical a bit depending on what your listening too, it's close enough that I use the head ai net for now rather than switching until I build my switch... if there was a significant difference I would switch the opticals each time, but it's not bad ai-net at all...

  8. #318
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    Quote Originally Posted by turbocad6 View Post
    technically optical, in practical use there real close, but you can hear the cleanliness of the optical a bit depending on what your listening too, it's close enough that I use the head ai net for now rather than switching until I build my switch... if there was a significant difference I would switch the opticals each time, but it's not bad ai-net at all...
    The greatest benefit optical has is less RF interference. But balanced outputs can be very musical, and many prefer that analog signal to the jitter seen with optical. I was wondering if AI-net puts out a balanced signal.

    The ultra high end computer audio and head-fi guys don't use optical because of the jitter and clock issues, instead they use USB into a DAC. I would go that route, but I am running 5.1, and the only USB DACs I see are mono or stereo. It would cost too much to run multiple USB DACs. For those interested, here are some links:

    http://www.stereo-link.com/
    http://www.wavelengthaudio.com/usbdac.html
    http://www.empiricalaudio.com/

  9. #319
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    yeah, I'm doing my next install now that is not getting a 700 at all, I'm going to use the apogee mini dac, but the firewire version, which is much better choice than usb really btw.

    I have that going into a dbx driverack 480 that can interface & be programmed & controlled with the pc. it has balanced in/out's, I do realize the limitations of optical, but realisticly, for a street car, optical is fine, even in competition red's setup is optical into the 700 & shes got all kindsa world champ trophies & stuff from it, so don't dismiss it unless your really looking for the epitamy of car stereo for pro level competition, once you start driving the car down the road all this goes out the window, both literally & figuratively....

    everything is a tradeoff & a compramise & optical is good for even high end street systems. once you start talking digital vs analog, your then getting into the issues of the fact that the source itself is digital!! one reason to go to a usb dac will be to bypass the windows k mixer & eliminate the upsampling, but this is really going off topic, theres a few threads here that are for ultra sq from a pc. in the end, this is not usually the limiting factor at all for most systems, & this is not practical at all for a 5.1 setup either, optical will be the best choice for that by far, cost of the dac's is only the begining of the problems in trying to do a 5.1 system that way.

    the ai-net buss may or may not be balanced in the normal sense, but they must have some kind of noise control built in, weather twisted pairs or some other way of balancing, because the buss is dead quite as far as rf interferance from what I've seen. don't know for sure what they use though.

  10. #320
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    Quote Originally Posted by bblitz View Post
    The wiring diagrams for the H701 show the head unit and changer connected with both AI-net and optical for each. Doesn't that mean the AI-net connection is for control only? If that is the case, perhaps you could have the CD changer connect to the H701 with an RCA.
    Appearantly the AI-net sends commands digitally and 2 channel sound analog. I don't think it is balanced as I hear an Alpine rep said the AI-net cable can pick up noise just like an RCA cable. Now if you have the CHA-624 changer which has the optical out, you can hook it up 2 different ways. If you just use the AI-net cable you will transfer a analog music signal. If you plug in the optical cable the H701 (as confirmed by Turbo) will automatically switch to that.

    Now here is an important thing to remember between the 2 different cables.
    With the AI-net cable the music will go through the HU or CD changers DAC first and become analog, go through the AI-net cable to the H701 where the analog signal will be converted back to digital so the processor can do it's EQ, x-over, etc... and then the signal gets converted back to analog through the H701's DAC's. It's a lot of converting going on.

    If you use the optical cable (on either a HU or changer) the digital will bypass the source's DAC and stay digital to the H701, bypass it's ADC and go straight to the processing and then it will use the H701's DAC's to convert the signal to analog for the amps. So there is a lot less converting as well as no chance of picking up stray noise in the cable.

    Quote Originally Posted by bblitz View Post
    Also, I do not know of a cheap AI-net HU that has its own inputs. I am planning on using the DVA-9861, which does not have any inputs.
    No, I don't think they made any. I've looked and looked. Everything that has inputs uses RCA's.

    So Turbo, when you have the system on and only have the one optical PC source will the HU volume control act as the master volume control for the PC's sound level?
    If so, will it continue to work that way with only the AI-net cable connected from the HU to the H-701?
    1999 Black Pontiac Trans Am
    CarPC's in F-bodies
    How To Relocate Climate Controls on the 97-02 F-body Cars
    (AMD Sempron 3000+, Opus 150)
    Car PC system is out, Alpine system is in.

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