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>=
>
>To:
><naturerecordists%40yahoogroups.com>=
m
>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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