Improving H4n SNR with juicedLink Low-noise Preamp at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > All Things Audio

All Things Audio
Everything Audio, from acquisition to postproduction.


Reply
 
Thread Tools Search this Thread
Old October 14th, 2010, 01:35 PM   #1
Sponsor: JuicedLink
 
Join Date: Jan 2008
Location: Palo Alto, CA
Posts: 47
Improving H4n SNR with juicedLink Low-noise Preamp

Many have been using juicedLink low-noise preamps to improve the signal-to-noise performance of their cameras. This principle works by throttling back noisy camera amps, and replacing the noisy gain with clean gain from the juicedLink low-noise preamp.

This benefits of this principle are diminished if your recorder already has decent preamps.

But, even with a H4n, juicedLink low-noise preamps provide a benefit of about 8dB over a broad frequency of interest.


Here is a recording using a Rode NTG2 going straight into a H4n:
http://www.juicedlink.com/downloaddata/H4n_NTG2.wav

In order to get my vocal peaks to hit -12dBFS, I need to run the H4n mic level at 100.


Now, feeding the NTG2 into a juicedLink CX231 at full gain, then going into the H4n minijack input, this allows me to throttle back the H4n mic level to 35 instead of 100. Here is the recording:
http://www.juicedlink.com/downloadda...NTG2_CX231.wav


To more precicely compare the noise performance, I powered off the microphone, and did recording of just the noise levels. Here is the H4n alone:
http://www.juicedlink.com/downloaddata/H4n_noise.wav
And, here is the juicedLink CX231 going into the H4n:
http://www.juicedlink.com/downloadda...X231_noise.wav

Using Audacity, I did an FFT plot to compare the 2 noise spectrums (attached).


Hey ... every little bit helps ...

-R
Attached Thumbnails
Improving H4n SNR with juicedLink Low-noise Preamp-plot_res1.jpg  
__________________
- Promotion: Win a Canon T3i !!! Drawing Oct 3, 2011
- President of juicedLink ... DVinfo sponsor
Robert Rozak is offline   Reply With Quote
Old October 14th, 2010, 02:43 PM   #2
Inner Circle
 
Join Date: Sep 2003
Location: Portland, Oregon
Posts: 3,259
Very interesting results, Robert. I've not done much benchmarking on this, myself.

Quote:
Originally Posted by Robert Rozak View Post
...Here is a recording using a Rode NTG2 going straight into a H4n:...
Straight into H4n via XLR?
__________________
30 years of pro media production. Vegas user since 1.0. Webcaster since 1997. Freelancer since 2000. College instructor since 2001.
Seth Bloombaum is offline   Reply With Quote
Old October 14th, 2010, 03:15 PM   #3
Sponsor: JuicedLink
 
Join Date: Jan 2008
Location: Palo Alto, CA
Posts: 47
Yes, for the H4n test, the Rode NTG2 was plugged directly into the XLR input of the H4n.

-R
__________________
- Promotion: Win a Canon T3i !!! Drawing Oct 3, 2011
- President of juicedLink ... DVinfo sponsor
Robert Rozak is offline   Reply With Quote
Old March 4th, 2011, 01:48 AM   #4
Trustee
 
Join Date: Jul 2007
Location: New Zealand
Posts: 1,104
Re: Improving H4n SNR with juicedLink Low-noise Preamp

So...I have a CX231 and have recently acquired an H4n...and have just tried out putting a Rode NT3 through the CX231into the H4n. What is the best setup to get minimum noise?
Renton Maclachlan is offline   Reply With Quote
Old March 4th, 2011, 08:19 PM   #5
Tourist
 
Join Date: Dec 2010
Location: Surrey Canada
Posts: 3
Re: Improving H4n SNR with juicedLink Low-noise Preamp

Ahhh, and I will add that using the Juiced Link into the 1/4 input instead of the on-board stereo mic, will give you a very portable 4 track recorder with independent control over each input ;)
Stephen Scheibel is offline   Reply With Quote
Old March 7th, 2011, 04:39 PM   #6
Regular Crew
 
Join Date: Sep 2007
Location: Monterey Bay area, CA
Posts: 82
Re: Improving H4n SNR with juicedLink Low-noise Preamp

Re: CX231 and Sony PCM-D50 - aside from phantom & XLR benefits:

- Are the JL pre-amps any better than the Sony?

- Can the JL output to Sony's line-in?
Tsu Terao is offline   Reply With Quote
Old March 8th, 2011, 11:45 PM   #7
Sponsor: JuicedLink
 
Join Date: Jan 2008
Location: Palo Alto, CA
Posts: 47
Re: Improving H4n SNR with juicedLink Low-noise Preamp

@ Renton: Crank the CX231 gain and trim up all of the way (make sure the trim is turned down all of the way on the unused xlr input) and let the CX231 do the heavy lifting of the gain, and then set the level in the H4n accordingly so your peaks splash just past -12dB

@ Stephen: YES!! Isn't that a cool little 4 track XLR setup!

@ Tsu: The CX231 drives an amplified mic level. So, you will use the mic in on the PCM-D50. I have many customers who use this setup who are really happy with their results. I don't have the D50, so I don't have personal experience to share ...
__________________
- Promotion: Win a Canon T3i !!! Drawing Oct 3, 2011
- President of juicedLink ... DVinfo sponsor
Robert Rozak is offline   Reply With Quote
Old March 9th, 2011, 02:48 AM   #8
Trustee
 
Join Date: Jul 2007
Location: New Zealand
Posts: 1,104
Re: Improving H4n SNR with juicedLink Low-noise Preamp

Thanks Robert.

When I plug NT3 > CX231 > H4n, the volume shown on the two tracks of the H4n are at different levels. Why so?
Renton Maclachlan is offline   Reply With Quote
Old July 18th, 2011, 05:55 PM   #9
Major Player
 
Join Date: Aug 2009
Location: Chattanooga, TN
Posts: 244
Re: Improving H4n SNR with juicedLink Low-noise Preamp

I'm shooting with a Canon T2i. I already have an NTG-2 and a Juicdelink CX231, and will be receiving a H4N in a couple days. Is the following setup possible? NTG-2 -> JuicedLink -> H4N -> T2i? If so, can I expect to see the same or similar benefits as the benchmark tests posted above? Or am I better off just sticking with NTG-2 -> JuicedLink -> T2i?
__________________
www.clarkvideoproductions.com
Michael Clark is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > All Things Audio

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 10:44 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network