Preamps for 7D

[Stephanie Joan]

And BTW, I’ve requested more info from JuicedLink about the Riggies and their response was “subscribe to the blog feed and wait for more info. Not very helpful.

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Stephanie
https://www.theculinarylife.com

[John Young]

What would this Pre-amp do that your H4N can’t do?

When I am on a shoot with my 7D and have to do video and audio all by myself. I attach my H4N to the hot shoe (a very inexperience accessory)and turn it 90 degrees so the H4N is facing me. I then take the mini-phono out from the Zoom to the mic in on the 7D. I record on the SD card on the Zoom and also sync in camera. If the AGC in the 7D screws up the in-camera sound, I can always use the separate-system sound on the Zoom.

John

[Jay Windland]

I just picked up an ART USB Dual Pre and am so far really happy with the preamp quality. Low output wired lavs and dynamic mics get a nice big boost of quiet gain, it runs on 9V and it was only $69. I haven’t fed my DSLR or audio recorder with it yet (I literally just got it) but the preamps sound great through my studio headphones. There are no mounting options like on the Juicedlink units, so I was thinking of mounting it with a super clamp and friction arm. More testing to be done first though.

[Stephanie Joan]

Huh – I’ve never even heard of this. Makes me wonder what other preamp models I’ve missed.

Thanks for the details!

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Stephanie
https://www.theculinarylife.com

[Jay Windland]

Yeah, I’ve been scouring the web and audio catalogs, and there are tons of preamp models. Battery powered portable preamps are pretty few though. There is another cheap one by Nady that got some bad reviews, there is this one, then there is the Juicedlink models, and up from there to Sound Devices. Honestly though, I’ve just been testing this unit with different mics for the last few hours and it is so-so. There is an exact spec for preamp self-noise called Equivalent Input Noise, or EIN, but to be less precise, I would say this: DSLR preamps completely suck, my Tascam DR-40 is a lot better than DSLR preamps, but still not good enough, and this ART preamp is better than the DR-40, but still not amazing. It may work as an irreducible minimum, but I’m still looking at Juicedlink…and maybe even Sound Devices. I just really hate preamp hiss.

[Brent Dunn]

You don’t need a pre-amp. Just connect the H4n via 1/8″ audio cable and a hot shoe mount.

Or, there are many microphones you can connect to the hot shoe and camera.

Brent Dunn
Owner / Director / Editor
DunnRight Films
DunnRight Video.com
Video Marketing Toolbox.net

Sony EX-1,
Canon 5D Mark II
Canon 7D
Mac Pro Tower, Quad Core,
with Final Cut Studio

HP i7 Quad laptop
Adobe CS-5 Production Suite

[Stephanie Joan]

But if I plug my h4n into my 7D and record audio that way, I’ll still have to deal with the AGC hiss since the h4n doesn’t provide an AGC disabling tone, right?

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Stephanie
https://www.theculinarylife.com

[Phil Balsdon]

With the Canon 7D it is very important to choose a model with “AGC Disable” because internally the camera Auto Gain cannot be disabled. This means whatever audio you feed in the 7D will try to lift levels whenever the feed in becomes lower in volume.

The Beachtek DXA-SLR does this by feeding in a constant but inaudible low frequency tone on one of the channels. It doesn’t actually disable the the camera AGC it just gives it a constant reference level of audio to stabilise it’s normally dramatic fluctuations in level.

There is no after market hack (a la Magic Lantern) available for the 7D to over ride it’s AGC and allow you to set in camera audio levels manually.

Cinematographer, Steadicam Operator, Final Cut Pro Post Production.
https://philming.com.au
https://www.steadi-onfilms.com.au/

[John Young]

[Phil Balsdon] “With the Canon 7D it is very important to choose a model with “AGC Disable” because internally the camera Auto Gain cannot be disabled”

You are right. But is it worth $399, just for AGC disable if you already have the H4N? Wouldn’t it just be a better option to record on the H4N and then get Dual Eyes for $149?

Although if that $69 option has AGC Disable, that might be a good option.

John Young

[Phil Balsdon]

Having both the H4n or a similar external recorder and a pre-amp with AGC gives you the option of not having to use the external recorder and still get usable audio (although not quite as good). This might be when the pace of a shoot is so hectic it becomes difficult to remain organised and keep up, particularly when working solo.

It also means that if you loop your master audio out of the H4n to the camera (you should use a padded cable to do this to convert line level to mic level) you will have a usable back up audio track on the camera in the event of a problem.

I’ve had both these situations happen, (it’s not a case of if it will but when it will happen). The last thing you want is to go back to the client without coverage or an unfixable problem, it’s financially likely to be a bigger expense than not having all the kit in the first place.

I also use PluralEyes in post.

Cinematographer, Steadicam Operator, Final Cut Pro Post Production.
https://philming.com.au
https://www.steadi-onfilms.com.au/