Monday, February 11, 2013

Sescom Adapters Keep RF Out Of Audio - OR NOT!

Nothing hurts your location audio day more than cell phone warbles. You can tell clients and crew to turn them off, but more often than not, they don't until you hear THAT SOUND and have to tell the producer you can't use that take because someone's cell phone got polled from the mothership.

I have a client with an iPhone that used to cause interference. I wired a Neutrik EMC XLR on a cable and "Poof" RF-BE-Gone!

[Update: 8/31/2013 The RF was blocked going into a Millennia Media STT-1 and Greg Hanks BA-660. It was not blocked when going into my GML preamp. So soldered on EMC connectors help prevent RF from getting into your audio, but the front end of the preamp also needs to be designed to block RF.

Now Sescom has them as inline adapters; one with the filter on the male side, the SES-INLINE-EMCM, shown directly below. Before you buy, read on!

and one with the filter on the female side (SES-INLINE-EMCF). 

Two days after I got these my client came in and we tested them under the same conditions in which the XLR connectors were working. The Adapters were NOT able to block his cell phone's interference. I"m breaking away from our session right now to report this. It may be because the the shields are lifted on the adapters. I have contacted Sescom to see if they can find a solution. [Update: They seemed disinclined to take any action.]

So, RF blocking is apparently the result of soldered on EMC connectors and the design of the preamp they are plugged into.

Technique, Inc. © Copyright 2013 All Rights Reserved

Ty For may be reached at