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Marantz PMD706

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Re: Marantz PMD706

Postby ConcertinaChap » Mon Dec 03, 2018 11:14 am

Yes, a couple of this sort of thing is what you need for channels 5 and 6. You can solder them yourself if you're handy with a soldering iron. As you're buying second hand you might find it will come with suitable adapters. Of course, channels 1 - 4 need no adapters.

I didn't hit the problem Mike had with the default file format, mine was set to separate files on arrival. Nevertheless it's worth looking out for. As separate files, everything is nicely aligned and when you import the files into your DAW everything sounds as it should. I do my recording at 44.1kHz 24 bit which always worked well for me. When setting the levels there is a line on the meters display. If you aim to get your levels at around that line and only peaking over it occasionally then you'll find that when you transfer them to your DAW the levels are just where you want them to be.

Cheers,

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DR680 power

Postby ConcertinaChap » Mon Dec 03, 2018 6:35 pm

On the mains-free front, I've got a powerbank rated at 23000mAh which I use to power my wife's electric piano on gigs. I think I might try as an experiment using it to power the DR680 and see how long it will run for with 4 mics on phantom power. Probably next week, we're insanely busy this week and the powerbank is needed on Friday for its proper use.

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Re: Marantz PMD706

Postby Wonks » Mon Dec 03, 2018 6:44 pm

Say 6mA per mic @ 48v = 1.15W. So add that to the power consumption of the DR680 and you should get a rough idea. Voltage conversion will be lossy, so you could probably add 40% and say 1.5W.
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Re: Marantz PMD706

Postby Sam Spoons » Mon Dec 03, 2018 6:51 pm

The website specs say :-

"Via (4) AA batteries (Alkaline or NI-MH), USB bus power, or a USB adapter
Consumption: 2 W (with phantom power off), 4 W (with 6 channels and phantom power on)"
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Re: Marantz PMD706

Postby Wonks » Mon Dec 03, 2018 7:11 pm

Sounds about right for 6 max spec phantom power mics, though some only take a couple of mA, so reality will be a bit less.

So 4W @5v = 800mA. 23000/800 = 28 hours.

You should be good for recording a long gig, even if the battery pack doesn't quite perform as well it states.
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Re: Marantz PMD706

Postby ef37a » Mon Dec 03, 2018 7:32 pm

Wonks wrote:Sounds about right for 6 max spec phantom power mics, though some only take a couple of mA, so reality will be a bit less.

So 4W @5v = 800mA. 23000/800 = 28 hours.

You should be good for recording a long gig, even if the battery pack doesn't quite perform as well it states.

I would expect better than 30 hrs for a 23Ah battery? The Ah spec depends upon the drain current. Pull 100A off a 70Ah car battery and it won't go nearly 1.4hrs. Pull 7 amps and it will probably hit spec'. Pull 700mA and it could last 2 months!

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Re: Marantz PMD706

Postby Wonks » Mon Dec 03, 2018 8:01 pm

The main issue with powerbanks is that they are normally set up for charging phone batteries etc. and often cut off once they think the battery is charged. You'd certainly need to test whether it is happy constantly powering a recorder.
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Re: Marantz PMD706

Postby ConcertinaChap » Mon Dec 03, 2018 8:16 pm

I would not expect that to be a problem. This particular power bank is capable of delivering a range of voltages. So our piano requires 12 volts (as does the DR680) and it will deliver such into a variety of plugs as well as USB for phones. It will cheerfully power the piano for several hours and show a capacity drop of 10-15%. So I have high hopes for the DR680. It's rated at 85Wh and the DR680 at 9.5W with phantom which suggests I might get the best part of 10 hours. We shall see.

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Re: Marantz PMD706

Postby Wonks » Mon Dec 03, 2018 8:21 pm

ConcertinaChap wrote: So I have high hopes

Oops, there goes another rubber tree plant!
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Re: Marantz PMD706

Postby Sam Spoons » Mon Dec 03, 2018 10:55 pm

Oh dear :D
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Re: Marantz PMD706

Postby ConcertinaChap » Tue Dec 04, 2018 1:16 am

{sigh}

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Re: Marantz PMD706

Postby forumuser915213 » Sun Dec 09, 2018 6:26 pm

Having fun with it so far. I've learned to place it where I can see the screen.

It's certainly lovely and quiet, and I think my various mics all sound a little better than I've heard them before when I plug them into the DR-680.

With no sessions or sings to record this week, I've been experimenting with recording acoustic guitar sounds, and have found that even in my very unsuitable living room crossed (cheap) ldcs produce a /huge/ and shimmering sound in figure of eight centred on my 12th fret. I never thought I'd find a use for Blumlein outside of a proper studio.

That'll come in handy...

Thanks for the tips.

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