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Dirty-South Blues Harp forum: wail on! >
don't be afraid of a $12 impedance matching transf
don't be afraid of a $12 impedance matching transf
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Udderkuz03
47 posts
Mar 18, 2014
12:06 PM
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After over a year of blowing hard to get the harp to sound like what I thought was the right way to play, I finally got brave and tried to match up the impedance...well the microphone amazingly didn't feedback and"woke up" so to speak..someone said you don't need a lot of breath and using the device accomplished just that..I had a problem with feedback in my line6 spider 4 75watt amp and was suggested to use a di box to step down the output impedance to 600 ohms..then I bought a $199 bugera v5 tube combo and had no need for the di box because it didn't feedback, at any level ..so I said to myself what if I did what everyone has been saying and match the impedance with an impedance matching transformer and now the microphone don't use hardly any breath to get the harp sounding good...Point is try the transformer just to see if it'll make things better....
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Greg Heumann
2650 posts
Mar 18, 2014
7:35 PM
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Using an impedance matching transformer isn't about feedback or not feedback. It is about presenting the proper electrical load to the microphone for it to perform the way it was designed, and presenting the proper input signal to the amp for it to perform the way it was designed. If you don't care whether it performs the way it is supposed to - then anything goes.
If you do care then:
- If you have a high impedance mic and a high impedance input, you don't need an impedance matching transformer.
- If you have a low impedance mic and a low impedance input, you don't need an impedance matching transformer.
- If you have a high impedance mic and a low impedance input (or vice versa) then you do need an impedance matching transformer. "DI" boxes are just impedance matching transformers with connector sex set up for high to low.
Note that impedance is not the only difference between high and low impedance mics. Low impedance mics have XLR jacks that are wired in "balanced" mode. High impedance mics with XLR jacks are wired "unbalanced". For this reason, using a low impedance (XLR to XLR) cable with a high impedance mic, or a high impedance cable (XLR to 1/4" mono) with a low impedance mic - will result in low signal level.
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/Greg
BlowsMeAway Productions
See my Customer Mics album on Facebook
BlueState - my band
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Last Edited by Greg Heumann on Mar 18, 2014 7:38 PM
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