While this is very good mixer for vocals recording on DAW then models before 2009 package update "Now with Phantom Power" lack phantom power for condenser mics on XLR connector. DISCLAIMER: - If you don't know how to open the mixer or know how to solder then STOP and find a new hobby. I am not responsible if you get electric shock or burn your house etc. MODDING 502 FOR 24V PHANTOM POWER: Only some condenser mics like Shure stage vocal mics works with 11-52V phantom. Some true condenser mics don't work and they require 48V ±something. Look your mic datasheet if it supports less than 48V. I am looking to mod my 502 with full 48V phantom also with integrated 60hz filter so this is not fully complete mod yet but provides 24V for some mics as it when singing karaoke or recording to DAW. You can filter 60HZ in DAW if you like but I am still trying to filter 60hz noise off so stay tuned. There are 2 DC input pins which both have 24v DC. My Shure SM86 condenser mic specs said that it can use 11-56V phantom power so 24V is sufficient for my needs and I believe for most on stage vocal condenser mics while some expensive true condenser studio mics won't. 1. Pick up about 5-10 3k3 resistors. You need the match 2 resistors with multimeter that they are exactly same values for 0.01 accuracy. 2. Solder matched resistors into 24v pin. 3. Wire second ends to XLR pin2 and pin3 Here is photo of how to solder resistors: View attachment 4865 4. Add some electric tape under the soldering legs and wrap them all with second layer of electric tape on top. Voila! Your 502 is now modified with 24V phantom power. Current on 2 and 3 pin are from 3k1 to 6k8 from 7.9mA to 3,4mA where Behringer specs say that phantom with 48V uses 6k8 and current 7.9mA on resistors. I used on this photo couple matched 6k8 resistors and current is 3,4mA on the pins. My mic sm68 mic works fine. Note: Your phantom power is always on so if you need option to disable phantom power, you need to make hole to backside of the case and insert switch between 24v pin and resistor legs. Also you need 400uF to 1000uF 50V elco on switch output leg to resistors to smooth out the voltage spike and cradually start upping the voltage to 24V in 5 time scales. This wil filter the voltage spike as elco wil need to streghten the voltage in 5 time cycles and cannot output voltage spikes at all. WHat happens is when you switch your phantom on you will have smooth open. While you turn your phantom off the condenser will provide some voltage until it drains off so you will get smooth delayed voltage drop also. Note2: It is better to use 3K3 resistors to have 7.6mA current because atleast my SM68 manual says current drain is about 5,4mA so I am changing in some day if I need or not the resistors to provide more current. Don't know tho if I need to replace as the mic sounds nice and my current speakers cannot handle any greater loudness that the mic + mixer is providing.