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Thread: Crystal Clear Audio Mod for Sega Mega Drive 2 & Genesis 2, version 1.0

  1. #16
    Creator of the Mega Amp Raging in the Streets Ace's Avatar
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    Well, that explains everything. But I'd like to know how you can amplify the PSG sound channel more on your circuit. What part(s) need to be changed in order to amplify the PSG sound channel more?
    HATES ATGAMES WITH A PASSION


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  2. #17
    Mastering your Systems Shining Hero TmEE's Avatar
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    You will have to decrease the 1.5Kohm resistors on the PSG transistor outputs... why do you need louder PSG ? The level is more or less exact same as what a no TMSS MD1 does.
    Death To MP3, :3
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  3. #18
    Creator of the Mega Amp Raging in the Streets Ace's Avatar
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    For the MegaDrive clones that have horrid sound output. I was going to try out your new Audio Mod circuit on the GN Twin, since the prototype circuit caused some straining, even though it was less than the straining from the stock sound circuit.
    HATES ATGAMES WITH A PASSION


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  4. #19
    Contra HC super fan! Wildside Expert Afcs46's Avatar
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    One question. The chip MC4558 can be used instead the 4558d?


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  5. #20
    Mastering your Systems Shining Hero TmEE's Avatar
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    Last edited by TmEE; 07-09-2009 at 09:42 AM.
    Death To MP3, :3
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  6. #21
    Bite my shiny, metal ***! Hero of Algol retrospiel's Avatar
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    Awesome.

    Quote Originally Posted by Ace View Post
    A little TOO clear for my tastes. Metal Squad doesn't really sound all that great with all the bass removed.
    Like TmEE said, it's really just the high frequencies restored. That means that on the same stereo setup with the same volume and same EQ settings it will give you the impression that it would sound cleaner but with the bass gone. However, the bass is actually still there so you could just use your amp's EQ to shift the balance more towards a deeper, more bass driven sound. - "Restoring" high frequencies on the other hand doesn't work like that, they're either there or they are filtered out (like in a stock MD1 or even worse: a stock MD2), so TmEE's mod is the much better choice for everyone that got a decent audio setup at home.
    Last edited by retrospiel; 07-15-2009 at 06:05 AM.
    The Mega Drive was far inferior to the NES in terms of diffusion rate and sales in the Japanese market, though there were ardent Sega users. But in the US and Europe, we knew Sega could challenge Nintendo. We aimed at dominating those markets, hiring experienced staff for our overseas department in Japan, and revitalising Sega of America and the ailing Virgin group in Europe.

    Then we set about developing killer games.

    - Hayao Nakayama, Mega Drive Collected Works (p. 17)

  7. #22
    Creator of the Mega Amp Raging in the Streets Ace's Avatar
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    Wow... I completely forgot about just how clear Audio Modded MegaDrive IIs sound compared to pre-VA7 MegaDrive Is. Still, I'm going to adjust the circuit to try and get it to MegaDrive I bass levels.

    @Christuserloeser: I don't have an amp; the sound is run straight into my TV's Stereo speakers, and my TV's sound setup is just dumb(you can't adjust the amount of bass/treble).

    By the way, TmEE, I should soon be able to send you a VA7 MegaDrive. They're everywhere here; practically every Genesis Model 1 I find here is a VA7.
    HATES ATGAMES WITH A PASSION


    Mega Amp: An all-new audio circuit for your Sega Genesis/MegaDrive and clones.

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  8. #23
    Mastering your Systems Shining Hero TmEE's Avatar
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    Quote Originally Posted by Ace View Post
    Wow... I completely forgot about just how clear Audio Modded MegaDrive IIs sound compared to pre-VA7 MegaDrive Is. Still, I'm going to adjust the circuit to try and get it to MegaDrive I bass levels.

    @Christuserloeser: I don't have an amp; the sound is run straight into my TV's Stereo speakers, and my TV's sound setup is just dumb(you can't adjust the amount of bass/treble).
    Take a 0.1F ceramic cap and ~20Kohm potentiometer, put them in series and use it insead of the 0.022F cap, you can easily adjust filtering level that way

    Quote Originally Posted by Ace View Post
    By the way, TmEE, I should soon be able to send you a VA7 MegaDrive. They're everywhere here; practically every Genesis Model 1 I find here is a VA7.
    That sounds lovely
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  9. #24
    Contra HC super fan! Wildside Expert Afcs46's Avatar
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    Quote Originally Posted by TmEE View Post
    OMG, this sounds so cool... I will see if I can do this thing.


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  10. #25
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    If you rip music off the Sega CD, will it sound better with your crystal audio mod?

  11. #26
    Mastering your Systems Shining Hero TmEE's Avatar
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    There's no meaningful difference between recording of a CDDA track through the mod and direct lossless CD rip. You cannot get better sound than original unless I add some equalizer or something to the mod itself, but that would increase component count well over 100, perhaps even 200 when I want multiple bands and HiFi quality stuff. That's a bit of an overkill :P
    Death To MP3, :3
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  12. #27
    Shining Hero Joe Redifer's Avatar
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    Your Thunder Force 4 for MD1 sounds worse and more muffled than Thunder Force 4 recorded from my Genesis 1 (non-TMSS).

  13. #28
    Bite my shiny, metal ***! Hero of Algol retrospiel's Avatar
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    I'd love to hear some recordings of your non-TMSS Genesis 1. I have a TMSS Genesis 1 that I currently use for recording.

    Can't wait until I get CCAM'd hw from Tiido.
    The Mega Drive was far inferior to the NES in terms of diffusion rate and sales in the Japanese market, though there were ardent Sega users. But in the US and Europe, we knew Sega could challenge Nintendo. We aimed at dominating those markets, hiring experienced staff for our overseas department in Japan, and revitalising Sega of America and the ailing Virgin group in Europe.

    Then we set about developing killer games.

    - Hayao Nakayama, Mega Drive Collected Works (p. 17)

  14. #29
    Mastering your Systems Shining Hero TmEE's Avatar
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    That MD1 I used is my primary use VA4 PAL no TMSS MD1... I guess there's quite some part variation going on, thus differences in sound quality.....
    Death To MP3, :3
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  15. #30
    Creator of the Mega Amp Raging in the Streets Ace's Avatar
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    It's funny: my VA3 pre-TMSS Genesis 1s both have MORE bass than TmEE's VA4 MegaDrive 1. But my Japanese VA5 MegaDrive also has more bass than that. TmEE, did you use your computer's Line In to record your sound clips?

    I also have a question: how would I go about making the decaying from the YM2612 more audible using the CCAM? On the prototype circuit I built, the decaying of the YM2612 is inaudible, and I would like one of my Genesis 2s to sound exactly like the Genesis 1 using your circuit, and I will also get myself a second VA7 Genesis 1 to apply the circuit to so that I can make it sound like all other Genesis 1s with superb clarity and high bass.
    HATES ATGAMES WITH A PASSION


    Mega Amp: An all-new audio circuit for your Sega Genesis/MegaDrive and clones.

    Note: If you want to contact me on Skype, identify yourself or your contact request will be rejected.

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