Why the extra AV out on the SuperCD ROM?

[CatBoy]

I currently have a Super CD-ROM2 attached to a CoreGrafx II. My AV cable has always been attached to the Super CD-ROM2 av out.
I was looking at a way to optimize the video quality and a local guy offered me a PC Engine modded with RGB output. I was under the impression that plugging the PC Engine into the Super CD-ROM2 would never allow me to play CD games with RGB, only HuCards...
This morning I plugged the AV cable into my CoreGrafx II to test my theory and the CD game played just fine...
Why is there an AV outlet on the Super CD-ROM if the one on the CoreGrafx is sufficient? Am I missing something obvious? 

[LostFlunky]

PC Engine has no A/V out.  Well, no RCA jacks anyway.

[mickcris]

i always thought you have to get audio out of the cd rom side.  you may be missing some of the sound by hooking it up how you did.  try playing a music cd and see if it comes out of the console to test.

[LostFlunky]

i always thought you have to get audio out of the cd rom side.  you may be missing some of the sound by hooking it up how you did.  try playing a music cd and see if it comes out of the console to test.

I have a TG with A/V out on the side - I will try this. I thought I already did, but don't remember now.

[Nazi NecroPhile]

The audio passed back to the system is mono.  Use the one on the IFU for stereo.

[Bloufo]

When the sound no longer works out of your Super CD-ROM² unit, you'll be glad you have that other option. 

[TurboXray]

PC Engine has no A/V out.  Well, no RCA jacks anyway.

The PC-Engine CoreGrafx has A/V out via A/V cable port on the side. The original PCE and TG16 do not (instead need adapters/boosters/or DIY cables).

Why is there an AV outlet on the Super CD-ROM if the one on the CoreGrafx is sufficient? Am I missing something obvious?

The on on the CG only has mono CD sound mixed with stereo chiptunes. The SCD output is the one you normally want because it's the A/V of the original system, plus stereo mix of CD audio (and ADPCM).

 As someone else pointed out, if the audio amp circuit goes out on the SCD unit - you can always run it with mono CD sound mix via the other route until you can get it fixed.

[Joe Redifer]

I remember listening to CD tunes on my TurboGrafx-CD from the Turbo's RF output. It's all in mono of course since no RF jack on any console ever has been in stereo (though technically they could).