Need help with Homemade mic cable for B-chain alignment

[Frank Raia]

Need help with cable to hook up phantom powered mic to CP500.

The mic is a behringer ECM8000 (I know its not the best, but good enough for me)
The processor is a CP500

I made a cable and used pins 1 (+), 2 (-) and 6 (ground) from CP500 to xlr pin 1 (ground), 2 (+) and 3 (-). No power to any XLR pins
Changed it. Pin 6(ground), Pin 7 (Hot), pin 8(-) from CP500 to XLR pin 1 (ground), Pin 2 (Hot), pin 3 (-). Get 24v.

Is the second option correct at 24V? I thought it should be 48v?

Or am I wrong either way?

[Marco Giustini]

You cannot go wrong, follow the pinout (remember female and male are reversed) and it'll work. To confirm, buzz the pins once you've done, the plugs will have 1-2-3 printed on it so you cannot go wrong.

I really never checked the actual voltage, maybe it reads lower if nothing is connected to it?

ECM8000 might be fine sonically, mine physically failed after a while so in the end a good MM-1 is a small investment.

XLR+Connector+Pinout+Diagram+Rear+Pin+2+Hot+v2+green.webp

[Frank Raia]

Marco, I have the pin out okay. My question is more for the CP500 side. Why only 24v? And I forgot to mention I made sure the phantom power jumper is active.

[Tony Bandiera Jr]

Marco, I have the pin out okay. My question is more for the CP500 side. Why only 24v? And I forgot to mention I made sure the phantom power jumper is active.

Why not?

Seriously though, "Phantom power" for microphones has no real standard fixed voltage. It can range from as low as +9vdc all the way up to +52vdc. Most mics can operate within that range just fine, though some might lack dynamic range at the lower end (less than 24vdc.) +48 volt was used a lot in pro audio mixing consoles for decades when early condenser mics needed more power, but newer pro audio mixers are going to 24vdc.

The 24vdc from a CP 500 is no surprise as it is one of the common power supply rails used in that processor (and most other early Dolby cinema processors.)

In simple terms, it is a nothing burger as far as powering your mic with. It'll work just fine.

[Frank Raia]

Thanks Tony. Didn't know if it was not supplying the correct amount of voltage. Being an old unit.