r2d2 said:Hi ,
any info posted about :
classic (voltage summing) and modern (current summing)
as available in the Neve 75 series desk
is welcome ,
thanks in advance
w
JohnRoberts said:r2d2 said:Hi ,
any info posted about :
classic (voltage summing) and modern (current summing)
as available in the Neve 75 series desk
is welcome ,
thanks in advance
w
I am always willing to pontificate about summing technology.
I was not aware of that particular nomenclature-distinction.
I googled the neve 75 and it appears two use two different summing technologies "virtual earth" (what some call current***), and transformer windings (stacked I ASSume) that some call voltage summing.
Virtual earth summing is widely used and well understood. Using individual transformers is quite expensive for the task and I guess in theory does not suffer from the insertion loss associated with virtual earth.
I stopped using transformers for mic preamps in the 70's so I am not going to use one per bus stem inside a large console (I'm cheap). I guess if you have too much money you could use them.
FWIW modern digital domain combining is cheap and loss-less (in fact you end up with extra signal, or extra resolution if summed signal gets scaled down.)
JR
**** "current summing"... I had an interesting dance with the patent office back in the 1980's when I tried to patent my (lossless) current source summing bus structure. By summing together the output from synthesized current sources I avoided the insertion loss/noise gain inherent in typical virtual earth summers. Unfortunately for me the wet behind the ears patent examiner didn't understand the difference between "current sources", and "currents" flowing in typical VE summer. I couldn't afford to pay an expensive patent lawyer to educate him about basic electronics from my slender personal bank account back then. :'(
Possibly they have not replied because your question is inscrutable. What exactly do you want to know?r2d2 said:i asked to the actual neve 75 series desk manufacturer
some audio sample about the 2 summ option of the console
unfortunately no reply at now........
(.... a little bit no serious i.m.h.o. from a company that manage that pro type of "product"....)
JohnRoberts said:It may be a way offer two different "sound" choices, but if both are well executed the sonic differences should be subtle, if at all..
I suspect the actual differences could be characterized with good high resolution bench test equipment.
JR
PS: Being asked for sound samples is not a common request. Perhaps they could tell you studios or recording that used that desk.
I can measure things that I can't hear, and can't hear things I can't measure..r2d2 said:JohnRoberts said:It may be a way offer two different "sound" choices, but if both are well executed the sonic differences should be subtle, if at all..
I suspect the actual differences could be characterized with good high resolution bench test equipment.
JR
PS: Being asked for sound samples is not a common request. Perhaps they could tell you studios or recording that used that desk.
Measure Instruments are very good and help thing ,
but ears are the last "test" ,
R.
Sometimes, ears ear things that do not exist, though...r2d2 said:Measure Instruments are very good and help thing ,
but ears are the last "test" ,
R.
I know you're not kidding, having had to troubleshoot the (in)famous Barclay Studios custom board; it took me one and a half days to find an interrupted mix bus, for a broken joint. I don't know who at Neve designed this arrangement, but I think it's unworthy of a major manufacturer.ruffrecords said:At Neve, back in the 70s, the passive mixing bus bars were contained in a custom aluminium extrusion which consisted of a number of U shaped channels. Holes were drilled in the bottom of the U and bus feed resistors were fitted through these holes. Inside the U channel, the bus resistor was soldered to a length of one hole wide Vero strip (I kid you not) that ran the length of the channel. When this assembly was complete a flat aluminium cover was fitted over the top of the Us so each signal bus was completely and separately screened. The bus bar was fitted right underneath the routing modules that fed it and connected to it by short single unscreened wires.
Cheers
Ian
The "classic" summing hardly qualifies for voltage summing. It's current summing, albeit a different one than VE; I certainly wouldn't want to use the term "voltage summing" for it. Only an editor of advertising department can have the audacity to do so.r2d2 said:Hi ,
any info posted about :
classic (voltage summing) and modern (current summing)
as available in the Neve 75 series desk
is welcome ,
thanks in advance
w
JohnRoberts said:It may be a way offer two different "sound" choices, but if both are well executed the sonic differences should be subtle, if at all..
I suspect the actual differences could be characterized with good high resolution bench test equipment.
JR
PS: Being asked for sound samples is not a common request. Perhaps they could tell you studios or recording that used that desk.
Hi all,r2d2 said:Hi ,
any info posted about :
classic (voltage summing) and modern (current summing)
as available in the Neve 75 series desk
is welcome ,
thanks in advance
w
Enter your email address to join: