neumann v475 pimping ...

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[quote author="3phase"]isnet the MO12 just a highcut filter?[/quote]
yes
[quote author="3phase"]How you got rid of the low cut these broadcast modules usually have?[/quote]
look at the frequency response - no need to get rid of any low cut

difference between the b and c version:
since they are very "neutral" summing amps I don't think you will hear any difference
 
thanks for the info. maybe i mixed it up with the telefunken summing amps..they have a serious lowcut.

Do you know if all neuman summing amps leave the lows untouched?

What system do you use for your audio measurings?


regards
Sven
 
Thanks to Volker I'm just starting a very similar project with (hopefully) some minor differences.

First of all I'd like to make the first 2-3 input pairs mono-switchable. I thought of simply adding a 4dpt switch per pair, which sends the input signals to different resistors + both busses for the mono path. Secondly it would be nice to have a passive summing outlet as well - could I just split the summed signal before the V475? Do i need the same "shunt" resistor between the summing busses for the V475? If not that might be a problem when using the unit in "passive" mode with a simple signal split.

I will check the cards pinout + needed connections in the next few days in order to double check with the summing specialists at this board...

thanks in advance
Christoph
 
Congratulations ! Very nice rack !

I have a 475-2 on my shelves waiting for something like that ....

Looking at the schem I couldn't guess where you connected the main volume control ( I suppose the nice stepped attenuator switch is a master output level control ... BTW where did you get this beautiful baby? )

Generally on those modules gain control is a kind of feedback on the input xformer. But on this one I can't see anything like this :-(

What did I miss ?

Thank's
Phil
 
Phil,
the gain switch on my unit is ended the RG (Feedback patch)
it is an Elma 11 x 4 (thanks Viitalahde)

If this is possible on your unit, you have to look if you have an a, b or c version.
 
Mmm, don't know if I'm unlucky but mine seem to be a 475-2 .
No A,B or C model. Refering to the schems it's the only one that has no feedback loop ... but I can't guess the gain of this amp :-(
Is it full gain (around 40db I suppose) or is it unity gain ?
Can I make a summing amp with this one or was it just built for some other purpose ?

And maybe another dumb question but how do you calculate the Zshunt value for a 0 ohm input ? (using th classical formula you find Zs = 0 !!!!)

Thank's,
Phil
 
Thank's Volker,

475-2 = A ?

refering to the schems on kubi's website, I saw a 475-2 A with gain control (pin 12-13 & 18-19 or something ...)
and also a 475-2 (no letter mentionned) with no gain control ....

Did I misunderstud something ?


And on the other hand can you make a passive summer with a unity gain amp ?
How do you compensate the gain loss of the resistor summing network in this situation ?

Thank's
Phil
 
[quote author="philkerg"]And on the other hand can you make a passive summer with a unity gain amp ?[/quote]
when using a V475 it is not a passive summing mixer :grin:

and you are right, the 475-2 is the V475-2A without Rg - they have the same Datasheet.

if you want to add some Level control just put a passive attenuator at the output.
 
Thank's again Volker,

Ok I 'll sell this shit :grin:
A unity gain amp is for active summing only ... correct ?

I think I have some other dual 0 ohm amps such as TAB 372-1D. Is it in the same league than the neumann amp ?


And more basic : What are the positive points of a 0 ohm amp vs a regular mic amp for passiv summing ?
I saw somewhere a thread about this but I can't find it now ...

Cheers,
Phil
 
[quote author="philkerg"]Ok I 'll sell this shit :grin:
A unity gain amp is for active summing only ... correct ?
I think I have some other dual 0 ohm amps such as TAB 372-1D. Is it in the same league than the neumann amp ?[/quote]
for summing I would prefer the V475,
you can do other things with the 372 :green:
 
[quote author="crisotop"]I've to schematcis which state an "Rgk" for the V475-2[/quote]
both are V472 ? :green:
(did you receive your package yet ?)
 
yes, your A model has the Rg:
http://www.silentarts.de/lab/Studiotechnik/Neumann/V475-2A_Data.pdf

and it only needs 2 decks for a (stereo) switch, not 4 (like the B model)
 
I think 475-2 A,B & C models have Rg connections.
Only the basic 475-2 doesen't Grrr

Volker, what did you mean about "doing some other things" with the 372 ?
Was it making a fire for the barbecue :wink: or something more serious ?

I used a 372-1 (the faceplate mono model) for a mic pre, it was not bad at all .... different from a 672. But very interesting in a different way.

Any opinions about 0 ohm amp vs "classical" mic/line preamp for a passiv summer ?
 
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