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Gear / Technical Help => Battery Boxes, Preamps, Mixers, ADCs, and Processors => Topic started by: nedstruzz on November 22, 2008, 10:03:33 AM
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So I am seeing a show tonight (Saturday) and a good friend wants a SPIDF patch for his DAT. I will be running 140's>Portico>744 @24/48. I've given a DAT patch off the 744 via SPIDF before but am fairly certain the last 8 bits are just getting dropped by the DAT deck so I have come up with a solution and am wondering everyone's thoughts.
Here's what I am thinking to run and I have just set the V3 internal jumpers to -20db.
140's>Portico>744@24/48> out of 744 via analog XLR>V3 W/ANSR>SPIDF to DAT.
Is there a better way to give a 16bit patch from my 24/48 744??
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Sounds like a good way of accomplishing that to me...am I safe to assume the portico doesn't have a 2nd set of outs to send to the V3? Also (assuming again :-\) the 744 analog outs are a true passthrough correct?...meaning it won't be going 744 a/d > d/a > v3?
If those assumptions are correct I'd say you have about the perfect solution. Just run that V3 hot for the 16bit ;).
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Yeah the Portico has no additional outputs and I think the signal would go A/D>D/A>XLR outs. It would be nice if the 744's XLR outputs could simply be a pass through but I don't think thats possible.
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a couple of thoughts. while it's true that a 24/48 signal would get truncated to 16/48 by a DAT deck, it's really not too bad. certainly not ideal, but it still is a pretty good option.
of course, another alternative would be to just run the V3 for the show instead of the portico. analog out of the V3 to your 744, and digital out to his DAT deck. while the V3 won't give you the same sound as the portico, its certainly no slouch of a pre-amp either.
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of course, another alternative would be to just run the V3 for the show instead of the portico. analog out of the V3 to your 744, and digital out to his DAT deck. while the V3 won't give you the same sound as the portico, its certainly no slouch of a pre-amp either.
I thought of that but have yet to really try the 140's with the Portico so I wanted to give it a shot.
Seems like I have a few options here.
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Yeah the Portico has no additional outputs and I think the signal would go A/D>D/A>XLR outs. It would be nice if the 744's XLR outputs could simply be a pass through but I don't think thats possible.
I might be wrong, but on the portico if you press the "To A Buss" and the "To B Buss" buttons on the portico, dosn't it give you an additional line level signal to the 1/4" jacks on the back?
I have never used mine that way, but always thought that was how it worked.
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Then again maybe not......
From the portico web site....
Buss Output
The To Buss output is unbalanced and has a high impedance output. It is intended for use with the Portico Buss Amp/Monitoring modules. A TRS patch cord is used to connect the 5012 Buss output to one of these bussing modules. The Monitor connection is derived pre mute on the 5012 and will produce a signal at the output of the buss modules that is equal in level to that at the 5012 output. The Monitor output cannot be used for any other purpose.
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I have taken digital 24/48 patch to my 16 bit iriver, I fail to see it being a major issue
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I think 24 > 16 bit truncation sounds horrible.
The 7xx almost immediately sends the incoming analog to the A/D, so any output is post A/D > D/A. It'd be interesting to know how much of the 7xx gain is done in analog vs. digitially. SD have been rather tightlipped when I have asked in the past.
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I mean its a patch, if that want a "perfect" copy they can get the files latter.
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So I ran 140's>portico>744 @24/48>Analog out>V3 ANSR>DAT Saturday night and it seemed to work well. I have not heard the results of the DAT tape yet but I enjoyed having independent level control on what was being sent to his DAT. I was able to have my peaks on the 744 at -6 and his around -2.
Only issue I could see was that the V3 chassie got very hot. Seems strange as I was not really using the pre and only the AD. Odd.
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Once upon a time I didn't think the v3 gave off much heat. Recent experiences suggest otherwise.
With a lithium battery, the v3 with a/d disabled gives off almost as much heat as a 722 recording to hard drive. Don't ask me how I know, I just know ;)
On paper, I think the 722 is about 1000 ma/hour and the v3 is probably around 700-800.
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On paper, I think the 722 is about 1000 ma/hour and the v3 is probably around 700-800.
the V3 with phantom on and A/D on draws around 1000ma. obviously, this varies a bit depending on the mics and the required current draw to power the mics. with the A/D converter off, the V3 draws about 700ma (pretty much the same as what the V2 draws).
Only issue I could see was that the V3 chassie got very hot. Seems strange as I was not really using the pre and only the AD. Odd.
there is no way to bypass the pre-amp in the V3. you said in the first post that you've got the internal jumpers set for -20dB. you are essentially attenuating the signal and then using the pre-amp to bump it back up.
and in regards to heat generation, a large part of the story is the type of battery that you use. a V3 can run on anything from 6V-12V. but if you feed it 12V, it first drops the voltage down, and a large part of that energy is gets lost as heat. If you feed it 6V, the V3 remains much cooler during operation.
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there is no way to bypass the pre-amp in the V3. you said in the first post that you've got the internal jumpers set for -20dB. you are essentially attenuating the signal and then using the pre-amp to bump it back up.
and in regards to heat generation, a large part of the story is the type of battery that you use. a V3 can run on anything from 6V-12V. but if you feed it 12V, it first drops the voltage down, and a large part of that energy is gets lost as heat. If you feed it 6V, the V3 remains much cooler during operation.
Correct and in hind sight I probibly could of left the -20db jumpers in there normal position and been just fine. I was using a 6volt battery so the extra heat was most likely caused by the -20db attenuation and then me boosting that level up to feed the DAT deck decent levels.