Many thanks for this not easily apparent insight Rob!
Max
Rob Danielson wrote:
> At 10:16 AM +0000 5/29/08, Philip Tyler wrote:
>
>> Hi
>>
>> I don't know about the performance of the Samson unit, but both the
>> Rolls and Art units seem to perform excellently judging by the tests
>> Rob has carried out.
>>
>> But it might be worth pointing out that both the Rolls and Art
>> phantom units can be powered from 'internal' batteries, looking at
>> the PDF for the Samson it looks like it can only be powered by an
>> external DC supply which plugs into it's DC in which you could do.
>> But as the Rolls and Art devices have space for internal
>> batteries it would make for a neater unit?
>>
>
> As Phil points out, the Samson seems to require 18volts DC through
> the external "coax" jack. If the unit matches noise performance with
> the Art and Rolls units (which iI cannot vouch for), the 18 volt DC
> requirement is not necessarily a bad thing because:
>
> 1) 2- 9 volt alkaline batteries internally installed on the Art and
> Rolls only last about 2 hours with moderate current mics (2-3ma).
>
> 2) Rechargeable 9 volt batteries are quite expensive and not very
> powerful. They will run the Art/Rolls units for only ~1.0 - 1.5 hours.
>
>
> Its great to be able to leave the phantom power supply and recorder
> "on" to enable instant monitoring and recording all the time you are
> hiking/recording. So, comparing coax/external powering on all three
> units: The Samson might run significantly longer on a sled/battery
> pack comprised of 15 - AA size rechargeable batteries (18 volts) than
> the Rolls/Art externally powered with a sled/battery pack of 10- AA
> size rechargeable batteries (12 volts). I get about 8-10 hours using
> a 12 volt (10 X 2500ma AA cells) battery pack on my Art Phantom.
> Rechargeable batteries are pretty much the only way to go for a
> number of reasons.
>
> A downside to 18 volts requirement is its harder to find a charger
> for packs over 16 volts DC. Rob D.
>
>
>> Phil
>>
>>
>> ----- Original Message ----
>> From: oatcruncher <<maxcatterwell%40o2.co.uk>=
uk>
>> To:
>> <naturerecordists%40yahoogroups.com>=
com
>> Sent: Thursday, 29 May, 2008 10:08:53 AM
>> Subject: [Nature Recordists] Re:External mic suggestions for Olympus LS-=
10
>>
>> In relation to this, does anyone on the group have experience
>> of/knowledge of S-phantom power supplies as per this link please?
>> <http://www.samsonte>http://www.samsonte ch.com/products/
>> productpage. cfm?prodID=3D 1747
>> Max
>>
>> --- In naturerecordists@ yahoogroups. com, Rob Danielson <>
>> wrote:
>>
>>> At 4:49 PM -0700 5/28/08, peter rhalter wrote:
>>> >The Denecke PS-2 - Portable Dual 48V Phantom Power Supply is
>>>
>> another
>>
>>> >option. You will also need a double XLR to 3.5mm cable. If the LS-
>>>
>> 10
>>
>>> >provides plug-in power, you may need to either turn it off or
>>>
>> block
>>
>>> >it to avoid added hum.
>>> >Peter
>>> >
>>> Hi Peter--
>>> Yes, I can confirm there is a possibility of hum. I found that the
>>> Denecke PS-2 unit can generate a hum when used with some recorders
>>> that have Power in Plug (PIP) mic inputs. I got a loud hum with all
>>> of the Sony and Sharp consumer products I tested and the capacitors
>>> needed to eliminate it (block the DC) affected LF response more
>>>
>> that
>>
>>> I would have wanted. The PS-2 may work with the LS-10, but it
>>>
>> might
>>
>>> be wise to make sure that you can return the unit in case it
>>>
>> doesn't.
>>
>>> I know it seems like using a $40-70 device between expensive mics
>>>
>> and
>>
>>> a recorder doesn't make sense monetarily, but Eric Benjamin bench
>>> tested the Rolls unit and found that it will not introduce noise
>>>
>> even
>>
>>> when used with the the lowest noise, low impedance mics and lowest
>>> noise recorders. I A/B'd the Rolls and Art and found there is no
>>> audible difference in the noise performance between the two. Both
>>> units produce 48 volts.
>>>
>>> Curt Olson reported that he removed the Art Phantom II's printed
>>> circuit board from the metal case (and also left behind the two XLR
>>> outputs) with no ill effects to make it a much smaller unit.
>>>
>> >
>>
>>> The phantom supplies do require considerable power so you might
>>>
>> want
>>
>>> to consider making a 10 X AA cell (NiMH rechargeable? ) sled if you
>>>
>> > want to record or monitor for long periods of time. Rob D.
>>
>>> --
>>>
>>>
>> __________________________________________________________
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>>
>>
>>
>>
>
>
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