Rob, That is exactly the same thing we did, good old Western Elec coils on to a switcher board that is right before the card. I've since put a DBX stereo compressor in between but it's still clean and we're still showing balanced to the rest of the studios.
On Wed, 2011-09-28 at 10:51 -0400, Rob Landry wrote: > > On Wed, 28 Sep 2011, [email protected] wrote: > > > I've run into similar issues with the M-Audio Delta cards - a need to > > put isolation transformers in the audio lines to get a clean sound. > > A client of mine is using those cards in two studios. In the air studio, > where he is only playing audio, they are fine, but when he installed the > cards in his production room he had hum on his record inputs at -45 dB or > so. When we looked at the cards closely, we found that the "balanced" > inputs were single opamps with (if I remember right) 10K ohms in series > with the inverting input and 10K ohms going to ground on the other side to > create something that measures balanced but has no common-mode rejection > at all. So, we added Western Electric 111C coils. > > What's amazing is that a piece of technology made by the phone company in > the 1930's still sounds as good as anything that's ever been developed > since. > > > Rob > _______________________________________________ > Rivendell-dev mailing list > [email protected] > http://lists.rivendellaudio.org/mailman/listinfo/rivendell-dev -- Matthew A. Chambers, CBT Assist. Broadcast Engineer KWIX - KRES - KIRK - KTCM 300 West Reed Street Moberly, MO 65270 660-263-1500 FAX: 660-269-8811 Cell: 660-676-3219 www.centralmoinfo.com Super Station KRES 104.7 FM Information Radio KWIX 1230 AM The Captain KIRK 99.9 FM Glory KTCM 97.3 FM FlatCertLogoGradient_000.jpg This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited. _______________________________________________ Rivendell-dev mailing list [email protected] http://lists.rivendellaudio.org/mailman/listinfo/rivendell-dev
