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The Sound Devices MixPre runs on 2 AAs and sounds great.  It only  
gets a couple of hours with 48V running though.
http://www.sounddevices.com/products/mx2master.htm

Sonosax also has a very nice DC unit that uses 2 9Vs:
http://www.sonosax.com/SXM2/sxm2.html

/EL

On Oct 13, 2005, at 12:12 AM, Scott Phillips wrote:

> I shouldn't think so. More of an issue for line level, isn't it? DC-DC
> converters are fully integrated and cheap enough. Admittedly, 48 volt
> phantom at reasonable currents for use with standard mics would  
> present
> some battery life problems for AA batteries using DC-DC conversion I'd
> guess. Not exactly my area of expertise though...
>
> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:[log in to unmask]] On Behalf Of Tom Fine
> Sent: Wednesday, October 12, 2005 7:26 PM
> To: [log in to unmask]
> Subject: Re: [ARSCLIST] Seen at AES NYC
>
> Isn't it difficult to get the voltage swing needed for good opamp- 
> based
> preamps when your power source is 2 or 4 AA batteries?
>
> ----- Original Message -----
> From: "Scott Phillips" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, October 12, 2005 12:36 PM
> Subject: Re: [ARSCLIST] Seen at AES NYC
>
>
> One wonders why they are having so much trouble providing decent mic
> preamps on these devices. It isn't exactly rocket science, unless the
> analog design portion was turned over to digital design engineers...
>
> Designing really great preamps is a challenge, but these devices  
> aren't
> even hitting an ordinary 'good' level in an area that is  
> fundamental to
> their design use.
>
> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:[log in to unmask]] On Behalf Of Lou Judson
> Sent: Wednesday, October 12, 2005 10:49 AM
> To: [log in to unmask]
> Subject: Re: [ARSCLIST] Seen at AES NYC
>
> If you are taking a board feed only, then you aren't even using the
> preamps, are you? Thus your experience doesn't include the mic pres...
>
> <L>
>
> Lou Judson * Intuitive Audio
> 415-883-2689
>
> On Oct 12, 2005, at 4:26 AM, Prentice, Will wrote:
>
>
>> We use the Fostex FR2 for documentary recording of live music and
>> theatre performances, in each case simply taking a feed from the  
>> house
>>
>
>
>> mixing desk (which is the extent of our remit in that regard). The
>> noisefloor from lighting, heating etc is such that preamp performance
>> of the Fostex hasn't been an issue. That said, at the time we bought
>> them the only other contender in the price range was the Marantz
>> PMD670, which had a noticeably noisier preamp, and other features  
>> less
>>
>
>
>> appropriate to our needs.
>>
>> Will
>