You can use adapters to connect headphones and it will probably be "loud enough". The problem is that you'd need more than 1 adapter because all the RCA to minijack adapters I've seen are either male-female or female-male. So you'd need gender changers too.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>
Sure, you could pick up a <A HREF="http://www.radioshack.com/product.asp?catalog_name=CTLG&category_name=CTLG_007_002_001_002&product_id=274-883" target="_new">Stereo RCA female (2-jacks) to Stereo 1/8" headphone (male) adapter</A> to do the cable conversion, then a <A HREF="http://www.radioshack.com/product.asp?catalog_name=CTLG&category_name=CTLG_007_002_001_003&product_id=274-1555" target="_new">Coupler</A> to change the headphone plug (male) to a headphone jack (female).
Oh, and if you want all gold, you'd just get a <A HREF="http://www.radioshack.com/product.asp?catalog_name=CTLG&category_name=CTLG_007_002_001_003&product_id=274-886" target="_new">Different Coupler</A>
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>
The PS/2 isn't SUPPOSED to have audio IN, it's SUPPOSED to have audio OUT, to a TV! The adapter changes it from RCA audio out to 1/8" stereo minijack out. The coupler allows you to connect your headphones by making it a female connector.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>
Oh, BTW, sound level should be similar to many sound cards at full volume on the "line out" jack. The reason is that most soundcards these days don't have an amplified headphone jack, just a line level jack. Headphones are line level too.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>
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