FastFourier
23 posts
Jan 29, 2018
1:54 PM
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I have a Schure 575s mic and a PA speaker - what's the simplest thing I can put between to amplify the sound? A pre amp? Recommendations? Thanks.
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rogonzab
1043 posts
Jan 29, 2018
2:07 PM
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A powered speaker?
A joyo american sound would be great for that kind of setup
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Sorry for any misspell, english is not my first language.
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dougharps
1690 posts
Jan 30, 2018
8:08 AM
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If it is a passive speaker you need an amp or PA amp to amplify your mic signal to the speaker.
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Doug S.
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1847
4672 posts
Jan 30, 2018
8:32 AM
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i would think a quilter micro block would work. they are only $150.00
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FastFourier
25 posts
Jan 30, 2018
11:25 AM
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I have two powered speakers that I normally use to play music directly from a laptop via an mp3 jack (sorry, I said "PA speaker" by mistake in my original post). All I want do is try out the mic before spending money an another amplifier for the harmonica. I don't care about effects. I believe all I need is something to bring the mic output up to line level (and have an mp3 output) - isn't that called a pre-amp? I'm looking for a cheap temporary solution.
In the old days, I would have plugged the microphone into the back of my stereo amplifier and played through my JBL 100 watt speakers until the neighbors complained, but I gave that equipment away when I got the amplified speakers.
Last Edited by FastFourier on Jan 30, 2018 11:25 AM
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dougharps
1691 posts
Jan 30, 2018
12:13 PM
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Most of the powered speakers I see have XLR inputs for mics with volume adjustments. If so, an impedance matching transformer could do the job.
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Doug S.
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rogonzab
1044 posts
Jan 30, 2018
2:04 PM
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An Art Tube Mp would work for testing mics (1/4 and XLR inputs)
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Sorry for any misspell, english is not my first language.
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FastFourier
26 posts
Jan 30, 2018
7:09 PM
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Thanks to all for your suggestions.
@rogonzab - That looks like a reasonably priced solution - I may get one of those.
@dougharps - Alas, my speakers have no XLR inputs. They're good speakers (made by audioengine), but aren't intended for playing from a mic. But your comment about an impedance matching transformer has motivated me to go back and review basic circuits to see why a transformer would be necessary in this case.
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dougharps
1692 posts
Jan 30, 2018
8:00 PM
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The purpose of the IMT would be (if you had XLR inputs) to go from a 1/4" unbalanced to XLR balanced to plug into the speaker.
The high to low-z issue is not as significant an issue with PA or powered speakers unless the signal is from a super high-z crystal or ceramic mic element, or a piezo guitar pickup. In those cases you would lose low frequencies.
At least this is my current understanding, subject to revision by others on the forum who may be more knowledgeable.
But since you have 1/4" unbalanced line inputs and a mic with unbalance 1/4" output, I believe that the suggestion of Rogonzab to use an Art Tube preamp is a good one.
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Doug S.
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indigo
458 posts
Jan 30, 2018
8:09 PM
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I used to have one of those Art tube preamps.It is one of those things that i actually regret selling. It was an excellent product that did what it said on the tin.
I bet most of us have regretted selling something...
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FastFourier
34 posts
Feb 09, 2018
9:34 PM
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@rogozab I got an Art Tube MP for about $40 and it works great! Thanks for the suggestion. With the Schur microphone, which cost something like $70, and the amplified speakers that I already had, I got a cheap system which works fine (at home) until I save up enough for a tube amp.
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