Epworthslim
21 posts
Oct 01, 2011
7:22 PM
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so i have some nice mics now a d4t salt shaker a 545F and a 585sa But what I dont understand is the difference between hi impedence and low impedance and what are line match transformers and when do you use them? what is the setup for amplified and what is the setup for a PA. I know the 585 SA is a high impedence mic and the d4t is a low impedence mic and the 545F i have'nt got a clue as there is no data out there in cyber space on that model.
So if any of you technically minded people want to fill me in on the secret to successfully making these mics sound good that would be great
Slim.
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WinslowYerxa
67 posts
Oct 01, 2011
10:43 PM
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Impedance is just an electrical value measured in ohms. Some devices work with high impedance (hi-z) and some with low impedance (lo-z). If the mic doesn't match what it's connected to you won't get optimal signal level or sound quality.
Guitar amps are high impedance and so are most bullet mics. Most PAs and most dynamic mics (including vocal mics) are low impedance.
To plug your hi-z device (guitar, guitar preamp, bullet mic, etc.) into the low-impedance PA you're going to need a matching device called either a DI (means direct input) or a direct box. Some PAs may have high-impedance inputs but you can't count on it.
To plug your lo-z vocal mic (this includes the Fireball) into a guitar amp or similar amp tricked out for harp, you need an inline low-to-high impedance transformer. This may take the form of a hard tube or a short cable connecting two connectors, with a 3-prong XLR socket on one end (for the mic cable) and a guitar plug on the other (to go into the amp), and maybe a switch to switch the impedance matching on and off.
Last Edited by on Oct 03, 2011 2:38 PM
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Greg Heumann
1287 posts
Oct 02, 2011
1:16 AM
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Winslow's answer is correct, clear and concise. If you want to know more about harp mics, impedance, and a bunch of related topics, you can download All About Harmonica Microphones, and then some..." which is also available on my web site.
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/Greg
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shbamac
168 posts
Oct 02, 2011
3:15 AM
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Your D4T should be a hi-z mic. D4T (hi-z), D4TL (low-z, 200 or 500 ohms) and D4 (low-z, 20-50 ohms).
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Epworthslim
22 posts
Oct 02, 2011
2:36 PM
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I tried the 545F with the PA today and it has a great tone sounded magical. did not need any gizmo's just straight in no problems but man did my hand hurt after 4 hours practice with the band. Soon as i got some money saved up i am def getting a ultimate from greg. But dont think i could bear to send this one as it is so rare.
Thanks for all the info guys, may have to invest in a DI box for the other 2.
Slim.
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