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Dirty-South Blues Harp forum: wail on! > Imp Matching Transformer?
Imp Matching Transformer?
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Luke Juke
103 posts
Feb 06, 2010
6:06 AM
I thought I'd better buy a new mic before Mr.Sparrow buys them all:) So anyways, I've just bought an EV RE10 and I'm going to need an impedance transformer. Are they all the same? Can anyone recommend one or recommend a particular one to stay away from? Anyone got any other advice? heers people
pharpo
139 posts
Feb 06, 2010
6:35 AM
I just got an EV664 on ebay for what I thought was a great price....It even has some history - being used by Mohammad Ali at one time. When it arrived it had a matching transformer included......Now I consider it a STEAL. Greg - on this forum has them at.

http://www.blowsmeaway.com/
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Music is your own experience, your own thoughts, your wisdom. If you don't live it, it won't come out of your horn. They teach you there's a boundary line to music. But, man, there's no boundary line to art. - Charlie Parker
Luke Juke
104 posts
Feb 06, 2010
7:46 AM
Should I plug the transformer into the input of my delay pedal or into the amp?
pharpo
140 posts
Feb 06, 2010
7:56 AM
good question....I have not used mine yet and did not think of it.....I'll test both ways and post back.
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Music is your own experience, your own thoughts, your wisdom. If you don't live it, it won't come out of your horn. They teach you there's a boundary line to music. But, man, there's no boundary line to art. - Charlie Parker
hvyj
130 posts
Feb 06, 2010
7:57 AM
I like the Peavey rat tail IMT. You can get them on the web from Green Fly Music at a good price. . Green Fly provides great customer service, too.

i don't use bullet mics, so I've been using IMTs for a long time. The Peavey IMTs are available with male or female XLR connectors The SKU is 0072010 for the one you want.

Connect the IMT to the end of the XLR cord for the mic and then plug it in to the input of whatever is first in chain.
Greg Heumann
276 posts
Feb 06, 2010
9:00 AM
"Connect the IMT to the end of the XLR cord for the mic and then plug it in to the input of whatever is first in chain."

YES! This is the correct way to go. Almost all pedals made for guitar or harp are high impedance, so you want to convert your signal before it gets to the pedals. Any time you see 1/4" mono plugs and jacks - you should assume that is a high impedance connection.


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/Greg

BlowsMeAway Productions
BlueState - my band
Bluestate on iTunes
tookatooka
1161 posts
Feb 06, 2010
9:12 AM
Is 600 ohm considered high impedance? Anyone know the figures regarding what is high and what is low please?
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Click to Blow Your Brains Out!
pharpo
141 posts
Feb 06, 2010
9:40 AM
Yep I should have waited and read Greg's post. I plugged it into the input of my delay and it was right. I also kinda did a mic comparison between my BB/CM mic and my new/old EV664. The 664 is nice but I still like the CM. Gotta send out my Shure to get Ultimized.... but going to Mississippi is eating all my "discretionary funding" LOL
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Music is your own experience, your own thoughts, your wisdom. If you don't live it, it won't come out of your horn. They teach you there's a boundary line to music. But, man, there's no boundary line to art. - Charlie Parker
congaron
508 posts
Feb 06, 2010
9:50 AM
600 would be considered low, but some amps like the valve junior sound pretty good with a 600 ohm mic and no transformer.
Shredder
138 posts
Feb 06, 2010
2:10 PM
Been using this one for 3 years with no problems.
Mike
http://accessories.musiciansfriend.com/product/Audix-T50K-Inline-Impedance-Matching-Transformer?sku=330710
Rick Davis
185 posts
Feb 06, 2010
2:15 PM
I like the Audix rat-tail transformer, same as Shredder.

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-Rick Davis
Blues Harp Amps Blog
Roadhouse Joe Blues Band
scottb
100 posts
Feb 06, 2010
4:21 PM
I recently got an Audix transformer and use it for my RE 10 and it is UNBELIEVABLE the difference. It's a totally different mic thought that thing.

Last Edited by on Feb 06, 2010 5:38 PM
Greg Heumann
279 posts
Feb 07, 2010
12:20 AM
"600 would be considered low, but some amps like the valve junior sound pretty good with a 600 ohm mic and no transformer."

To do this, I assume you're using an XLR<-->1/4" cable to hook the low impedance mic to an amp. This takes the signal from the mic's pin 2 or pin 3 (not both), relative to ground on pin 1. The mic's output, however, is on pins 2 and 3 - and NOT on pin 1. When you use this setup (as opposed to XLR<-->XLR cable and an IMT), you are literally throwing half of the mic's signal away. And because the signal is no longer allowed to "float" relative to ground, you're defeating the low impedance "balanced wiring" from doing its job of superior noise rejection.

This may well be a good way to cope with an amp that has way too much gain. It still is a big impedance mismatch though, so details like frequency response are going to vary from the mic's spec a good deal. (And that MAY be a good thing too.)

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/Greg

BlowsMeAway Productions
BlueState - my band
Bluestate on iTunes

Last Edited by on Feb 07, 2010 12:27 AM


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