ArcadeVGA issue with multisync monitor

[esaelectrionics]

I am using ultimarc arcadevga 2 ,i am using the a microvitec myltisync monitor (1701) for testing prior to installing in my cab, one  thing i have noticed is the output at 15hz is not great in the amount of contrast it kicks out.The card just seems to be a bit dull compared to my other ati 9700 in 30khz but when at 15 khz it just seems even less colourfull as if the output needs more power or something.
I also have a jpac for boosting the signal when i get it installed in my cab will this fix the problem ?,has anyone noticed this problem?.Is this just a side effect of running at a reduced refresh speed.
people never seem to talk about the quality of the colours when they talk about gfx cards!

[ahofle]

Hmm I've never heard of that monitor.  Maybe check with Andy at ultimarc -- I know he sells a video amplifier which is needed for some monitors.  I have no contrast issues at all in 15khz modes with the AVGA2 and Betson multisync FWIW.

[AndyWarne]

The on-board amp on the J-PAC should cure this problem.
Andy