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Plugging a soundcard line-out directly into a JPAC
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ArtMAME:
I did a JAMMA-based MAME cab for a friend.  I ended up just putting an extra set of powered PC speakers in there along side the original speakers.  So his MAME setup uses the powered PC speakers, and if he wants to test or use JAMMA boards, he can just disconnect the harness from the JPAC and connect his JAMMA board which will use the original cab speakers.
TPB:

--- Quote from: CheffoJeffo on July 15, 2008, 08:20:16 am ---
When I put a PC-based rig into a JAMMA cabinet, I put an amplifier in-line between the sound card and my JPac.


--- End quote ---

CheffoJeffo,

And your JPac is then connected to the Cabinet speakers (as opposed to PC speakers) ?

Diewrecked:

--- Quote from: CheffoJeffo on July 15, 2008, 08:20:16 am ---I picked up a number of amplifier kits. They run off of 12V, which I grab from the PC power supply.

Here is a pic of the kit installed in a rig that I am about to (well, intend to is more accurate) recycle into a new project.

--- End quote ---

CheffoJeffo this looks like it's exactly what I need. Would you be willing to sell one to me? If so, whereabouts are you based please? (I'm in London)

Many thanks mate
Zebidee:
You do need an amplifier.  Cheap PC speakers should do the trick.

I do suggest that you change the original cab speakers though.  In my experience (and I have seen a lot of cabs), the original speakers are pretty crappy and
NOT MAGNETICALLY SHIELDED!!.

This means that they may damage the monitor over time, especially if positioned close to the monitor.  I think that the original manufacturers didn't really care about this, as they are only concerned about $$ in their pockets and the next year or so of operation.  On the other hand, most PC speakers ARE magnetically shielded, as they often are placed on either side of a PC monitor.

This means REPLACE THOSE DODGY ORIGINAL SPEAKERS.

Look here to find out how to wire a volume pot in while you are at it:

Volume Control Mounting and Wiring

CheffoJeffo:

--- Quote from: TPB on July 16, 2008, 11:06:17 pm ---And your JPac is then connected to the Cabinet speakers (as opposed to PC speakers) ?

--- End quote ---

Yep.

EDIT: I should say that one big reason why I do this is so that I can yank out the PC rig and drop in a JAMMA board at will. Mostly this is so that I can retask a cabinet, either to keep (I did this recently on my vertical MAME cab ... yanked the PC, which you saw in the picture and will be reused, and dropped in a 48-in-1) or to sell (it's easier to sell a JAMMA cab than a MAME cab). If you have no desire to do either of those things, then the solution is perhaps less compelling.
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