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Author Topic: V3 jumper levels with a Nuendo Multiset  (Read 4223 times)

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V3 jumper levels with a Nuendo Multiset
« on: November 24, 2003, 01:11:09 PM »
Hey all-
I just got forwarded an interesting email that some of you may find helpful or just something to stimulate the mind!

Original message to Grace:
Quote
I have a nuendo multiface that I usually runs analog from my V3.  The coax runs to my backup DAT,  which is usually the copy I have to use because the multiset overshoots when I run the V3 at -2 or -1 dBFS.  The V3 and the Multiset have jumpers to control level.  i'm thinking I should match the levels in the multiset to the V3 to keep the hottest level from your fine preamp(I'm not sure if it effects the bal/unbal nature when I change either jumpers.)  I attached the manual for the multi set, the jumper levels are on page 22:                                        
                         0 dBFS@       Headroom
       Lo Gain      +19dBu            15dB
        +4               +13dBu           9dB
       -10             +2 dBV             12dB
or should I change the output from the V3?  That would leave me flexable to use the analog outputs for a consumer DAT when needed. then match that level on the multiset.  If you know the pros and cons of setting each to match the other(cleanest signal path Vs. flexability/clean path, it would be very helpful.

It goes over at the factory setting of+4,  so i'm thinking  Lo Gain,  But if you think otherwise,  I would appreciate the advice.

The reply:
Quote
If I understand correctly, the issue you are describing is this-
The meters on your V3 and the meters in your workstation are off by
approximately 2dBFS?  Example, the multiset overs and the V3 meter shows
-2(ish) dBFS.

Let me start off by describing the V3's metering.  Obviously, the meter
corresponds directly to the dBFS level of the AD output.  A 0 on the V3
meter corresponds to 0dBFS out and a peak hold represents an occurrence
of an over in the AD conversion.  This meter also serves another very
useful function for monitoring the analog level in your preamp.  When
recording with an AD process, it is critical that you are monitoring
both your analog stage and your digital stage to assure proper operating
levels for each.  The clip points of both the digital and analog
portions of the signal path are aligned in the V3 such that when the
meter shows an over, this is also the onset of clipping in the analog
domain.  This equates to an analog level of +25dBu.  The V3 AD converter
sensitivity is set for +25dBu = 0dBFS.  So to illustrate this, a meter
reading of -3 equates to a digital level of -3dBFS and an analog level
of +22dBu (+25dbu - 3dBu).

Now in your Multiset, the AD sensitivity differs from that of the V3's
AD converter and you are on the right track for addressing the issue you
are experiencing.  For the closest matching between the meters, set the
Multiface to +19dBu = 0dBFS (Lo Gain Setting).  This will provide the
best performance.  Using the other settings will compromise your
signal-to-noise performance as you will not be utilizing the best gain
staging with your V3.

There are a few options that you have for changing V3 settings.  First I
believe that the previous change is your best option, and while the
meters may not align perfectly, it will probably give you the best
performance.  The V3's meters are calibratable, but this is not highly
recommended.  Changing their calibration results in loosing precise
monitoring of the actual levels in the V3.  You could also run
unbalanced out of the V3 to the multiset.  When the V3 runs unbalanced,
it's maximum output is +19dBu, which in theory would perfectly align
your meters.  For short cable runs, performance should not be
compromised by doing this.  If you choose to try this be sure to wire
the output as described on page 6 of your V3 owner's manual.  Leave pin
3 disconnected on the V3 output.

Anyone have similar results?

Phil
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