"Charles H. Riggs, III" wrote in message
...
"Alan Rutlidge iinet.net.au" rutlidge@NO_SPAM wrote in message
...
The Shure A96F Line Matching Transformer
( http://www.shure.com/pdf/userguides/...ories/a96f.pdf )
should
work okay.
Setting the A96F to the 150 ohm option will give you the largest voltage
increase...Depending on the wiring of the microphone input socket on the
R1, you may
need to cut the wire in the tip / ring / sleeve jack plug as shown in
the
diagram on page 2 of the pdf guide in the link above.

I found a buddy handy with a soldering iron, and we made the change, as
per
http://www.shure.com/pdf/userguides/...ories/a96f.pdf over to an
output for 150 ohms (or is it OF 150 ohms; not sure of the correct
terminology).

AND IT WORKED!!!!!!! My mike level is perfectly fine now going into the
Edirol R-1, and just why the #$%^&* Shure Transformer comes out of the box
set to some exotic mid-impedance level like 600 rather than a normal low
impedance level of 150, and just why the #$%^&* so-and-sos at Shure didn't
add an external switch to effect the impedance change rather than burying
it
as a solder job I'll NEVER know.

But thank you, thank you, thank you. I was watching $1200 go down the
drain
in recent days and not feeling too happy about it. Really appreciated.

Cheers,

Charles



Hi Charles,

Glad to read it's finally working and to your satisfaction.

The reason why the Shure transformer probably came set to 600 ohms as the
default impedance, is that 600 ohms is a common impedance for professional
equipment using balanced circuits.
Fortunately Shure had the forethought to design the primary winding of the
transformer with a 150 ohm tap to accommodate lower impedance devices such
as your Sony mic

The method behind the madness of a solder joint over a switch is well
founded. In your case, a low level microphone (tens of millivolts) and
having no d.c. present on the circuit, a switch may become noisy over time
and lead to more annoying problems. Now all you should do is add a sticker
to the outside of the case saying "set to 150 ohms" so any other user does
not think it is still on the default of 600 ohms.

Cheers,
Alan