Tempest_2084 wrote:
I recently had my Colecovision modded for RGB. It uses a standard Genesis 2 style SCART cable now and everything works, but the audio is weak when I'm using the 5X Pro. I hooked it up to a Sync Strike on my RGB monitor and the volume level is normal, it's just when I use it through the 5X that I get diminished sound. I can turn up the volume and hear it, but that introduces distortion, especially on screens that normally have no sound such as the skill select screen before each game.
My other systems seem to work just fine so it must be something to do with the RGB mod and the way it interacts with the 5X Pro.
The guy who did my mod mentioned that when he does the audio he wires it to both the mono pin and both stereo pins so no matter what you'll get sound (the CV is normally mono). Could this be confusing the 5X Pro somehow? That's the only thing we can think of.
Is this the same as with the 2X? My friend has the Retrotink 2X and he didn't have this issue.
The cable is a standard Insurrection Industries Genesis 2 cable.
Look at Tim W's diagram of Genesis 1 and 2 SCART setup in the first two pictures:
http://members.optusnet.com.au/eviltim/ ... escart.htm
Let's call the left sound L and the right sound R. Mono sound means only one speaker and Stereo sound means having a left speaker and a right speaker.
Genesis 1 supports Mono sound like Colecovision. Genesis 1 outputs L + R from its one audio pin that goes to both pins 2 and 6.
Genesis 2 supports Mono and Stereo sound. It outputs L + R from its left audio pin that goes to pin 6 and L - R on its right audio pin that goes to pin 2. That is a minus sign. We'll come back to that.
SyncStrike doesn't encode audio. It just sends pin 2 to white jack and pin 6 to red jack.
RetroTINK products probably work like CRTs that are backwards compatible with Mono and Stereo at the same time.
They assume white jack carries L + R. They assume red jack, which is optional, carries L - R.
Either Tim's diagram is wrong for Genesis 1 SCART cable or:
a) SCART TV doesn't support Mono and outputs pin 6 to left speaker and pin 2 to right.
b) SCART TV is super smart and detect pin 2 = pin 6 and goes into Mono mode.
c) SCART TV is Mono with just one speaker like all PVMs.
What CRTs with Mono AND Stereo support do internally is send (white + red) / 2 to the left speaker. Mathematically, this is L + R in Genesis 1 and your case and just L in Genesis 2 case.
They send (white - red) / 2 to the right speaker. Mathematically, this is no audio except the electromagnetic interference that got encoded in normal TV. Just R in Genesis 2 case.
RetroTINK must be supporting Mono AND Stereo and encodes HDMI audio the normal CRT way.
Correct Mono audio wiring would output (1/2) (L + R) to both left and right speakers.
You get low volume, soft and distorted sound because only left speaker has real audio and right has interference that becomes worse when you increase the volume.
Turning off right speaker if possible would essentially fix.
The guy wired audio incorrectly, except you fix by plugging white jack only into TV or TV auto detects Mono for analog sound input. You can't fix this sending everything through SCART where HDMI TV port assumes Stereo.
RetroTINK doing nothing wrong - your mod person has to remove sending any audio to pin 2. Or maybe it could detect for people doing audio wrong and ignore pin 2 if pin 2 = pin 6.
tl;dr This is all SCART's fault.