Thanks for the info Greg. It's just temporary. I'll be getting a Lynx pretty soon. Matt Boynton Vacation Island Recording 90 Walton Street Brooklyn, NY 11206 Tel: 347 225 3201 www.vacationislandrecording.com
On Fri, Dec 2, 2011 at 2:11 PM, Greg Norman <[email protected]>wrote: > I posted something about the problem with using the DD 192 HD converters > with unbalanced inputs. Like you said, if you connect those outputs to an > unbalanced input, the signal will drop 6dB and the ground of the input will > be driven with audio. Unless you have a pretty amazingly earthed ground > plane, you will get some crosstalk. > ...and > For the 192s, we can't just lift "pin 3" (-) to solve the problem > unfortunately. On the 192s the shield isn't the same, or connected to the > audio ground. This means neither polarity can work by themselves using the > shield as the ground reference, as normal unbalanced signals work. There > is no audio output ground reference available. > > If you want to keep the HD192s, the only solutions are to balance every > input in your studio, or unbalance the outputs of your converters... > > Greg Norman > Electrical Audio Recording > 773.539.2555 > *www.electricalaudio.com* > > *My email address has changed to [email protected]* > *Please update your address book.* > > On Dec 2, 2011, at 11:58 AM, Matt Syson wrote: > > Hi > If the 192 instructions tell you to lift the negative it suggests that the > outputs are not 'transformer like' but a simple amplifier out on the hot > and another amplifier out with phase polarity reversed for the negative. > With this scenario 'grounding' it will drive signal current into the ground > causing possible crosstalk, distortion and maybe even damage to the > converter outputs. > A 'simple' test for this type of output is to measure a continuous tone > signal at a convenient level, say 2 Volts on a multimeter, connected to > measure BALANCED (between pins 2 and 3 of an XLR or hot to cold). Now, > while monitoring the output level, short one side to ground. With a > transformer or 'electronically compensating' output the signal level will > not change, or only by a tiny fraction. Shorting EITHER hot OR cold should > produce no significant level drop. I suspect that with the 192 outputs you > would see a fall of 6dB (Half the original level). In this case you must > connect the signal into a balanced input or if you have no choice with an > unbalanced input, cut the 'negative' and accept the inevitable signal level > loss. With the negative cut you will not damage anything. > Matt S > > On 02/12/2011 17:12, Matt Boynton wrote: > > That's what my issue was. Sometimes lifting the shield isn't the answer > though. For example, a digi192 suggests on the rear panel to lift the > negative wire instead of the shield. Which is different than any other > converter I've encountered. I have the studio wired with the shields lifted > on the converters so whenever I plug into an unbalanced input on the neotek > the signal is 6 db or so lower. To remedy this I'm getting a new converter. > > Matt Boynton > Vacation Island Recording > 90 Walton Street > Brooklyn, NY 11206 > tel: 347 225 3201 > www.vacationislandrecording.com > > > On Dec 2, 2011, at 9:43 AM, Tom G <[email protected]> wrote: > > Hello Matt, > > Interesting. I do have some noise in my left master channel/monitor > however it is only the monitoring section. When I mix down to tape or > digital the signal is fine. I'll check into this too...I am guessing its > more of a power amp and may not be related to my preamp issue. > > Thanks! > Tom > > --- On *Wed, 11/30/11, Matt Boynton <[email protected]>*wrote: > > > From: Matt Boynton <[email protected]> > Subject: Re: NEOTEK: Series 1 Noise Problem > To: [email protected] > Date: Wednesday, November 30, 2011, 3:51 PM > > I had a problem where my speakers had a fairly high frequency buzz in > them regardless of the position of the control room volume pot. I > isolated it to the convertors. I ended up lifting the shield wire on > the ins and outs of the convertors and the buzz was gone. Maybe its > something similar. > Matt Boynton > Vacation Island Recording > 90 Walton Street > Brooklyn, NY 11206 > Tel: 347 225 3201 > www.vacationislandrecording.com > > > > On Wed, Nov 30, 2011 at 3:39 PM, Ike Zimbel <[email protected]> > wrote: > > > > Hi Tom, > > Do the channels have to be side by side, or any two at random? Does > this > > mean that you are using two and only two pre-amps when this happens, or > do > > you mean when it's a pair, like overheads, while using other channels for > > other inputs (IOW, can you only use ONE mic-pre on the Neotek at the > > moment?)? If that's the case, does the problem steadily get worse if you > use > > more channels? > > I very much doubt this is a grounding issue (in the 60hz hum sense, > anyway), > > but it MIGHT be an interface issue between the direct outs of the Neotek > and > > the input of the converters. > > Best, > > Ike > > > > > > On 11-11-30 3:27 PM, Tom G wrote: > >> > >> Hello All, > >> > >> I have been battling an issue with my Neotek Series 1 console on and off > >> now for about six months. When I use any two preamps (of the console) > at the > >> same time, I get a noise on one channel. According to my frequency > analyzer, > >> it is approx. 4k and is high enough in gain to make the track unusable. > When > >> I use outboard pre's there is no problem whatsoever. > >> > >> I thought it may be a ground loop or something similar, but floating the > >> grounds did not help. I'm using SSL converters and it doesn't seem to > matter > >> what inputs of the SSL I'm using nor what channels on the Neotek I > >> use...still the same noise. But only when using two channels together. > >> > >> Any thoughts? I have not tried completely floating all grounds except > for > >> the console. Once I get my tape machine back home and hooked up, I am > >> curious if I get the same result. Although as stated, floating the two > >> channels in question was no help. > >> > >> Thanks! > >> Tom > >> > >> > > > > -- > > Ike Zimbel, > > Zimbel Audio Productions Ltd. > > Toronto > > 416-720-0887 > > > > "Studio House Calls". Repairs and upgrades to analog audio equipment > > including: AMEK, dbx, Neve, Neotek, MCI, Soundcraft and more. Authorized > > Warranty service for Allen& Heath, Clear-Com, Drawmer, Soundcraft, SPL > and > > Yamaha. Ask about our RF frequency co-ordination services! > > www.zimbelaudio.com > > > > ------ > > > > View the list online at: > http://www.mail-archive.com/[email protected] > > > > You can unsubscribe at anytime by sending an email to > > mailto:[email protected] with "unsubscribe neotek" in the message > > body. If you have any difficulties, or questions --please send an email > to > > mailto:[email protected]. > > > > The Neotek list is lovingly hosted by Catapult Web. Remember that any > > message or reply sent to the list will be automatically forwarded to all > > subscribers. > > > > Vive Le Neotek! > > > > Thanks. > > > ------ > > View the list online at: http://www.mail-archive.com/[email protected] > > You can unsubscribe at anytime by sending an email to mailto: > [email protected] with "unsubscribe neotek" in the message body. If > you have any difficulties, or questions --please send an email to mailto: > [email protected]. > > The Neotek list is lovingly hosted by Catapult Web. Remember that any > message or reply sent to the list will be automatically forwarded to all > subscribers. > > Vive Le Neotek! > > Thanks. > > >
