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Author Topic: levels on d8 question?  (Read 7215 times)

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Offline halleyscomet8

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levels on d8 question?
« on: December 27, 2005, 12:51:43 PM »
so i was running some test with my new rig last night and noticed something. my levels would peek, but the over indicater never came on. when listening to the tape you can hear the capping, but it still does not show. i am running studio projects c4's>aerco mp2>ad20>d8. is there something i might be doing wrong or do i not have over indicaters? thanks in advance.
dave
« Last Edit: December 28, 2005, 12:52:30 AM by halleyscomet8 »
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Offline halleyscomet8

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Re: levels on d8 question?
« Reply #1 on: December 28, 2005, 09:41:15 AM »
anyone?
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spreadheadtom

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Re: levels on d8 question?
« Reply #2 on: December 28, 2005, 09:45:44 AM »
if you run the levels all the way up on a test does the "over" come on?

Offline Lil Kim Jong-Il

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Re: levels on d8 question?
« Reply #3 on: December 28, 2005, 10:01:59 AM »
Are you running digtal in?

iirc, the D8/D7 doesn't show OVR when the external ADC clips.  The D8 just sees a bit stream that it puts to tape.  You need to monitor the OVR indication on the ADC.  I don't recall seeing OVR on the D7 when running the SBM1 or V3 ahead of it, only when running analog in.

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Offline halleyscomet8

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Re: levels on d8 question?
« Reply #4 on: December 28, 2005, 11:06:37 AM »
if you run the levels all the way up on a test does the "over" come on?

no they do not :-\
Are you running digtal in?

iirc, the D8/D7 doesn't show OVR when the external ADC clips.  The D8 just sees a bit stream that it puts to tape.  You need to monitor the OVR indication on the ADC.  I don't recall seeing OVR on the D7 when running the SBM1 or V3 ahead of it, only when running analog in.



yes i am running digital in. the mp2 is an aerco, and has no level meters. neither does the ad20. so i guess i just need to keep an eye to not let them get to high on the d8 :-\
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spreadheadtom

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Re: levels on d8 question?
« Reply #5 on: December 28, 2005, 11:23:30 AM »
so i guess i just need to keep an eye to not let them get to high on the d8 :-\


just run low......you can always boost it up later  ;D

Offline halleyscomet8

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Re: levels on d8 question?
« Reply #6 on: December 28, 2005, 11:26:22 AM »
so i guess i just need to keep an eye to not let them get to high on the d8 :-\


just run low......you can always boost it up later  ;D


that's my plan :) thanks for the advice and +t all around
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stirinthesauce

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Re: levels on d8 question?
« Reply #7 on: December 28, 2005, 01:23:38 PM »
yeah, Dave, I never get that over message when I know I'm clipping.  Usually try to run mine at around -6db.  Gives me a little room to avoid clipping when it gets really loud.

Offline ethan

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Re: levels on d8 question?
« Reply #8 on: December 28, 2005, 02:33:39 PM »
yeah, Dave, I never get that over message when I know I'm clipping.  Usually try to run mine at around -6db.  Gives me a little room to avoid clipping when it gets really loud.

ugh...at -6db you're losing *half* your resolution
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Offline Kush

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Re: levels on d8 question?
« Reply #9 on: December 28, 2005, 04:25:31 PM »
yeah, Dave, I never get that over message when I know I'm clipping.  Usually try to run mine at around -6db.  Gives me a little room to avoid clipping when it gets really loud.

ugh...at -6db you're losing *half* your resolution


What if you record the levels low and then add gain during post? Will that help with the resolution loss? If not, kindly explain.
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Offline Lil Kim Jong-Il

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Re: levels on d8 question?
« Reply #10 on: December 28, 2005, 04:47:13 PM »
[What if you record the levels low and then add gain during post? Will that help with the resolution loss? If not, kindly explain.

No it won't recover any resolution you didn't have in the original recording.  If you record a really low signal and then add gain in post, your will also add gain to the noise in your recording.  You get some noise from the analog stages and some quanization noise at the ADC.  So you really want to maximize the signal to noise ratio at the time of capture.

Can't you mod that little ADC box to add an OVR lamp?
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Offline admkrk

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Re: levels on d8 question?
« Reply #11 on: December 28, 2005, 07:08:56 PM »
if you run the levels all the way up on a test does the "over" come on?

 ???

i've never noticed any kind of "over" signal on mine. just the meter hitting 0 and that doesn't always mean it's clipping unless it stays there for awhile.
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Offline Kush

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Re: levels on d8 question?
« Reply #12 on: December 29, 2005, 09:18:23 AM »
[What if you record the levels low and then add gain during post? Will that help with the resolution loss? If not, kindly explain.

No it won't recover any resolution you didn't have in the original recording.  If you record a really low signal and then add gain in post, your will also add gain to the noise in your recording.  You get some noise from the analog stages and some quanization noise at the ADC.  So you really want to maximize the signal to noise ratio at the time of capture.

Can't you mod that little ADC box to add an OVR lamp?

Excellent lesson learned, thanks. Pretty soon I will be running an Oade digi-modded UA-5 for my ADC box. I will make sure to get a SVU-1 or a SVU-2 for metering. Aren't these (SVU-1/2) pretty much the standard for metering when using a UA-5? Anyone have additional preferences?
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Offline SparkE!

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Re: levels on d8 question?
« Reply #13 on: December 29, 2005, 02:41:32 PM »
yeah, Dave, I never get that over message when I know I'm clipping.  Usually try to run mine at around -6db.  Gives me a little room to avoid clipping when it gets really loud.

ugh...at -6db you're losing *half* your resolution
You're only losing 1 bit of resolution, leaving 15 bits.  You can still approach 90 dB S/N with that.
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Offline ethan

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Re: levels on d8 question?
« Reply #14 on: December 29, 2005, 03:23:27 PM »
yeah, Dave, I never get that over message when I know I'm clipping.  Usually try to run mine at around -6db.  Gives me a little room to avoid clipping when it gets really loud.

ugh...at -6db you're losing *half* your resolution
You're only losing 1 bit of resolution, leaving 15 bits.  You can still approach 90 dB S/N with that.

1 Bit == 32768 possible values...still think it's insignificant?

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