Become a Site Supporter and Never see Ads again!

Author Topic: ad2k+ input level for a V2  (Read 4276 times)

0 Members and 1 Guest are viewing this topic.

markrsmith

  • Guest
  • Trade Count: (0)
ad2k+ input level for a V2
« on: July 03, 2013, 06:12:18 PM »
Where would I set my input levels on my ad2k+ ( 14 - 24) for a V2?
The V2 outputs a maximum of +27 dB (balanced) and +21 dBu (unbalanced).
The ad2k+ says to set the input level 3 - 6 dB before the mic preamp clips.
Seems to me I would set the ad2k+ at the 22 or 24 dBu level. 
I get confused between dBu and dB.
Again thanx for the advice.
« Last Edit: July 03, 2013, 08:28:41 PM by markrsmith »

Offline page

  • Trade Count: (25)
  • Needs to get out more...
  • *****
  • Posts: 8388
  • Gender: Male
  • #TeamRetired
Re: ad2k+ input level for a V2
« Reply #1 on: July 03, 2013, 06:19:28 PM »
yeah, you're in the ballpark. If you're connecting the two with unbalanced cables (why, I don't know, but I guess you could), then that would make a difference, but otherwise somewhere in the 20-24 range
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

Offline hi and lo

  • Trade Count: (38)
  • Needs to get out more...
  • *****
  • Posts: 2294
Re: ad2k+ input level for a V2
« Reply #2 on: July 03, 2013, 06:35:17 PM »
+27 dB (or dBv) is ~+29dBu, so you should be able to run the AD2k+ at +24dBu w/o worries.

markrsmith

  • Guest
  • Trade Count: (0)
Re: ad2k+ input level for a V2
« Reply #3 on: July 03, 2013, 06:52:15 PM »
Thanx Guys!

Offline macdaddy

  • Trade Count: (10)
  • Needs to get out more...
  • *****
  • Posts: 7657
Re: ad2k+ input level for a V2
« Reply #4 on: July 04, 2013, 11:58:39 AM »
+27 dB (or dBv) is ~+29dBu, so you should be able to run the AD2k+ at +24dBu w/o worries.
this is how I run the combo.

turn that dial all the way over to the left...

-macdaddy ++

akg c422 > s42 > lunatec v2 > ad2k+ > roland r-44

stevetoney

  • Guest
  • Trade Count: (0)
Re: ad2k+ input level for a V2
« Reply #5 on: July 04, 2013, 12:17:06 PM »
OK, so taking this one step further, once determining the optimal point, is there any disadvantage to running the ad2k+ below that as long as you aren't distorting.

Offline macdaddy

  • Trade Count: (10)
  • Needs to get out more...
  • *****
  • Posts: 7657
Re: ad2k+ input level for a V2
« Reply #6 on: July 04, 2013, 02:00:06 PM »
I am pretty sure that the two devices are calibrated closest this way. That is to say that what reads as peak is on the v2 is a peak on the ad2k+. For instance, when red lights are solid on the v2, I get over on the ad2k at this setting. When the dial was turned down, I would not get overs on the ad2k+
-macdaddy ++

akg c422 > s42 > lunatec v2 > ad2k+ > roland r-44

Offline jerryfreak

  • No PZ
  • Trade Count: (31)
  • Needs to get out more...
  • *
  • Posts: 6205
  • The plural of anecdote is not data
Re: ad2k+ input level for a V2
« Reply #7 on: July 31, 2013, 05:07:07 PM »
you want +24 (least sensitive)

if it had +27 that would be 'matched', but it doesnt, so +24 is as good as it gets
Unable to post or PM due to arbitrary censorship of people the mod doesn't like. Please email me using the link in my profile if you need to connect

Offline JasonSobel

  • Trade Count: (8)
  • Needs to get out more...
  • *****
  • Posts: 3327
  • Gender: Male
    • My show list
Re: ad2k+ input level for a V2
« Reply #8 on: July 31, 2013, 08:51:12 PM »
you want +24 (least sensitive)

if it had +27 that would be 'matched', but it doesnt, so +24 is as good as it gets

Based on what I recall, even if the AD2K did have a +27 sensitivity setting, it would be better to have it set one or two dB's below that.  With the the AD2K set to +24, you'll get digital clipping at +24 dB, and because you know that the V2 won't overload until +27, as long as you're not getting any digital clipping, you will also know that you're not overloading the pre-amp.

Basically, you always want the A/D converter calibrated such that it clips digitally before your upstream pre-amp overloads.  otherwise, if the pre-amp can overload before the A/D clips, then you could get a crappy recording (because the pre-amp overloads) and not know it just from watching levels.

Offline hi and lo

  • Trade Count: (38)
  • Needs to get out more...
  • *****
  • Posts: 2294
Re: ad2k+ input level for a V2
« Reply #9 on: July 31, 2013, 09:30:29 PM »
you want +24 (least sensitive)

if it had +27 that would be 'matched', but it doesnt, so +24 is as good as it gets

Based on what I recall, even if the AD2K did have a +27 sensitivity setting, it would be better to have it set one or two dB's below that.  With the the AD2K set to +24, you'll get digital clipping at +24 dB, and because you know that the V2 won't overload until +27, as long as you're not getting any digital clipping, you will also know that you're not overloading the pre-amp.


Remember that you need to convert dBv to dBU.

+27 dB (or dBv) is ~+29dBu, so you should be able to run the AD2k+ at +24dBu w/o worries.

Offline JasonSobel

  • Trade Count: (8)
  • Needs to get out more...
  • *****
  • Posts: 3327
  • Gender: Male
    • My show list
Re: ad2k+ input level for a V2
« Reply #10 on: August 01, 2013, 05:42:49 AM »
I realize that the V2 manual (http://www.gracedesign.com/support/v2_manual_a.pdf) lists the max balanced output as +27 dB, and the max unbalanced output as +21 dBu.  However, I think that's a typo, and I think the max balanced output on the V2 is actually +27 dBu.  I think this is the case because balanced outputs, coming from the same amplifier circuit, are 6 dB higher than unbalanced outputs.  +21dBu + 6dB = +27dBu.  (this 6dB difference between the balanced and unbalanced outputs is also true with the V3, except that there's no typo in the V3 manual...  +25dBu vs +19dBu for the V3).

in any case, regardless of whether or not the max V2 output is +27 dBu or ~+29 dBu, with the AD2K on minimum sensitivity (set to clip at +24dBu input), the AD2K will digitally clip before the pre-amp overloads, so as long as your levels look good, you'll be good to go.
« Last Edit: August 02, 2013, 08:41:48 PM by JasonSobel »

Offline hi and lo

  • Trade Count: (38)
  • Needs to get out more...
  • *****
  • Posts: 2294
Re: ad2k+ input level for a V2
« Reply #11 on: August 01, 2013, 07:43:39 AM »
Ah, good catch. That could be a typo.

Offline macdaddy

  • Trade Count: (10)
  • Needs to get out more...
  • *****
  • Posts: 7657
Re: ad2k+ input level for a V2
« Reply #12 on: August 01, 2013, 02:12:40 PM »
Typos aside, I have found what Jason said to be absolutely true...
-macdaddy ++

akg c422 > s42 > lunatec v2 > ad2k+ > roland r-44

 

RSS | Mobile
Page created in 0.066 seconds with 38 queries.
© 2002-2024 Taperssection.com
Powered by SMF