Tom,
Thanks very much for your explanation and research -- that old thread was v=
ery helpful
I'm going to wire up my MX391's as soon as I get some free time.
Best,
John
--- In "tk7859" <> wrote:
>
> Hi John
>
> I've had a look through the MX391 boundary microphone guide but did not f=
ind an answer to your query.
>
> The preamplifier supplied as standard with the MX391and MX391W (W=3DWhite=
colour) is the Shure RP183PK. This is not supplied with the MX391LP/O - t=
he mics I bought on ebay. The guide says that the preamp cam provide 12dB =
gain or 0dB gain depending on how one positions jumpers inside the preamp b=
ody. However there is no more info as to why and when the pre amp is to be=
used.
>
> I therefore did a google search and as far as I can gather the preamp is =
really a means of powering the MX391 from a 48V phantom supply. It is not =
really a normal pre amp but more of a power supply accessory probably to be=
used when long cable runs are necessary. Because I am using a relatively =
short cable length (4 metres) and a healthy PIP supply from the LS-10 the R=
P183PK is unnecessary and probably would not work for me as the recorder I =
use it with does not have a phantom supply.
>
> The most useful info I got from the google search was a pointer to our ow=
n naturerecordists Group. There was a longish series of posts re. the WL18=
3 (MX391 is a WL183 with a boundary mounting arrangement) back on 4th Augus=
t 2006. Message number 23831 is the one to read if you don't want to read =
them all.
>
> Hope this answers your questions. The info certainly has made me feel ve=
ry comfortable with my deployment of the MX391.
>
> Cheers, TomR
>
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