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Author Topic: Sound Devices MixPre-3 and 6, Part 6  (Read 77676 times)

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Offline jerryfreak

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #285 on: October 05, 2019, 08:00:17 PM »
stereo mix is what it says.... a mixdown of the available inputs/ISOs

there are 3 and 6 inputs available on those units, respectively
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Offline justme

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #286 on: October 06, 2019, 02:58:38 AM »
Shijan
As Jerry writes they do only record 3 and 6 individual channels (ISO).
The two addition 2 stereo mix down channels can be seen as a finished mixed result done on location of those individual recorded channels. Instead of doing the mixing of the three or six channels back home in post.

When in advanced mode the ISO tracks are recorded prefade so the level of large channel knobs only affects the mix down tracks.
The ISO channels recording level is defined from the set Gain in the gain stage.
But you can remix/ReRecord the stereo mix down tracks based on the ISO tracks in field as well.

Offline shijan

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #287 on: October 06, 2019, 04:30:21 AM »
This is very odd artificial limitation of MixPre-3.
My idea was to keep classic MixPre, and use ultra compact MixPre-3II for everyday stereo field recording. And in some rare situations when i need more mic inputs i was thinking to plug MixPre to MixPre-3II line in and have 5 mic inputs total. But seems it will not work like this with MixPre-3II.
« Last Edit: October 06, 2019, 04:43:59 AM by shijan »
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Offline shijan

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #288 on: October 06, 2019, 05:39:43 AM »
I also preferred MixPre-3 because more free space around rotary headphones button.

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Offline justme

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #289 on: October 06, 2019, 06:13:33 AM »
The mixpre-3 only have three preamps. The additional two mix down channels are summed internally and written as mix tracks into the wave.

But you could route timecode out from the mixpre-3 II into the mixpre-3 line/TC in and that way get them running time code synced with three channels of microphone or line input on each mixpre.
And that way creating a 6 channel recording package.

This is very odd artificial limitation of MixPre-3.
My idea was to keep classic MixPre, and use ultra compact MixPre-3II for everyday stereo field recording. And in some rare situations when i need more mic inputs i was thinking to plug MixPre to MixPre-3II line in and have 5 mic inputs total. But seems it will not work like this with MixPre-3II.

Offline shijan

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #290 on: October 06, 2019, 06:18:03 AM »
Interesting idea, but i don't have MixPre-3.
I told about original MixPre conencted to MixPre-3II 3.5mm aux line-in.

« Last Edit: October 06, 2019, 06:22:11 AM by shijan »
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Online Ronmac

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #291 on: October 06, 2019, 08:51:40 AM »
All versions of MixPre3 are limited to recording 3 channels, no matter what source (mic input or Aux input) you choose.

Offline justme

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #292 on: October 06, 2019, 08:53:18 AM »
Ahh.
I misunderstood you.

With the original mixpre connected to an input of the mixpre-3 you would still get three channels in the mixpre-3 out of which one is a mix down of the two from the original mixpre.
That’s really not any real superior solution.
A mixpre-6 II would give with four microphone inputs and two line inputs and separate timecode.
The mixpre-6 first gen would give you the same amount of inputs as long as you don’t want or need timecode. That complicates it a bit.
You need to sacrifice the 5/6 channels I believe. At least one of them.

Interesting idea, but i don't have MixPre-3.
I told about original MixPre conencted to MixPre-3II 3.5mm aux line-in.



Offline morst

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #293 on: October 06, 2019, 02:07:14 PM »
I also preferred MixPre-3 because more free space around rotary headphones button.
I like having more than three inputs.
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Offline noahbickart

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #294 on: October 06, 2019, 04:13:11 PM »
It’s the mixpre3 not the mixpre5.

If you want more than 3 channels, you’ll need to buy the 6.
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Offline shijan

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #295 on: October 06, 2019, 04:29:50 PM »
I understand that they try to protect higher models (3 channels vs 6 difefrence sounds more epic than 5 channels vs 6), but maybe send feedback to Paul or other developers somehow and with future firmware update mixpre3 may became mixpre3+2? It is really very odd artificial limit for this powerful device. It can record 5 chanenls when conencted to PC as sound card (i guess), it support fastest SD cards, so why it not allowed to record same 5 channels internally?
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Offline justme

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #296 on: October 06, 2019, 05:16:21 PM »
It might look that way.
But the MixPre-3 only have three preamps and one single AK5576 6 channel ADC configured in a 6 to 3 channel summation so it can only manage 3 analog inputs.
The 5 inputs over usb are digital data streams. Already converted from an analog stage to digital domain by some other ADC, perhaps in the computer or before it entered the computer.

But if you would find an external 5 channel pre amp with host usb interface, then you might be able to use the mixpre-3 as a 5 channel bit bucket.

I understand that they try to protect higher models (3 channels vs 6 difefrence sounds more epic than 5 channels vs 6), but maybe send feedback to Paul or other developers somehow and with future firmware update mixpre3 may became mixpre3+2? It is really very odd artificial limit for this powerful device. It can record 5 chanenls when conencted to PC as sound card (i guess), it support fastest SD cards, so why it not allowed to record same 5 channels internally?

Offline rippleish20

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #297 on: October 06, 2019, 05:49:44 PM »
 
Mixpre-3 : 3 Preamp | 3 Channel | 5 Track Audio Recorder
Mixpre-6:  4 Preamp | 6 Channel | 8 Track Audio Recorder


MixPre-6 can send eight channels (1-6, L, R) to the computer and receive four channels from the computer via USB, while the MixPre-3 can send five in (1-3, L, R) and receive two out


It seems to me that they could enable five channel recording. The aux inputs don't the kashmir pre-amps. While it's artifical, that they way they designed the 3, presumably to not compete with the 6.
« Last Edit: October 06, 2019, 06:31:03 PM by rippleish20 »
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Offline justme

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #298 on: October 06, 2019, 10:26:15 PM »
The only way the mixpre-3 could manage six channels in its ADC would be:

1. Not use the 6 to 3 channel summation and set the ODP, PW0, PW1 & PW2 accordingly for 6 channel use.
2. Have hardwired switchable support to accept six separate AINn.
3. Accepting a drop in DR with 3dB.

1. Is possible as they are logical settings, L or H.
2. This is down to the hardwired paths on pcb and supporting components.
3. This is down to SD accepting lesser signal to noise ratio.


So unless Paul et al have designed the pcb to support six individual inputs to the six AINn inputs, it’s not physically possible to offer more than 3 channels into and out of a single ADC AK5576.

Offline shijan

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Re: Sound Devices MixPre-3 and 6, Part 6
« Reply #299 on: October 07, 2019, 07:57:11 AM »
Thanks for explanation, now it is more clear for me.
So MixPre3 and 6 use dual ADC for each input to combine high and low gain. Each ADC is separate phisycal chip soldered to pcb. MixPre10 use the same? What about triple ADC explained in Sound Devices patent application? Is it possible that they use it in high end Scorpio line? Or it is technology yet reserved for future?
« Last Edit: October 07, 2019, 07:59:11 AM by shijan »
2x Oktava MK-012+Rycote BBG -> MixPre -> Edirol R-09HR

 

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