I've dealt with the guy in Austraila and he's a good guy...

The boxes I built had nothing in side of them, just the BnC bolted to one side and the banana jacks on the other and looked on the outside very similar. (I always put about 3 - 4 ounces of LEAD WEIGHT inside the box so it didn't move around.

I used the RG8 coax cable and NEVER had an issue with the old AMB20 and AMB8800 conversion systems, and when I got my NEW AMBrc system a few years ago, I continued to use the OLD Coax deal instead of the pretty NEW YELLOW Wired AMB w/ the deal on the end of it. (Over a year and a half)

When I sold off my old systems, I sold the old style boxes that I made with them...and started using the actual AMB decoder loop coax. (Which I still connect SPEAKER WIRE to for the actual loop.)

RUBEN! Did you sell off the old AMBrc decoder?

The guys in LINDSAY bought a new AMBrc3 system and I tried to use it once with the ALLEYCAT software I believe..and had NO LUCK (Thankfully I brought MY computer and decoder with me and just used mine)