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Post subject: Use a mic in a guitar amp and miking a guitar Amp
Posted: Tue Oct 19, 2010 2:49 pm
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Ok, I am not sure where to post this... so...
I have a question that follows details:
I have two dynamic microphones and three condenser microphones
I want to focus on the dynamic type
The two dynamic mics are a Labtec AM 222 and an Shure SM57LC

Mic Impedance Specs
AM 222 Rated Impedance: 2 kOhm.

SM57 Rated impedance is 150Ω (310Ω actual)

Tests
Amp instrument input
I can plug the SM57 into my BDRI and it works
I can plug the SM57 into my Frontman 25R and it works

The AM 222 does not work at all on either amp.

Computer soundcard mic input
I can plug the AM 222 into my computer's soundcard and signal is good in normal and with 20 dB gain selected

I can plug the SM57 into my computer's soundcard but signal is woefully weak and I am seeking to correct this issue.


NOTES:
The AM 222 has a mid-range impedance whereas the SM57 has a low impedance.

I've read about Impedance Transformers and High Z v. Low Z.

I've been planning on purchasing a Yamaha MG series live mixerboard that provides options but will it correct this low signal
(vol) issue with this Dynamic Mic?
Would I be wasting my money on an inline Impedance Transformer if I am planning on a mixer board anyway?


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Post subject: Re: Use a mic in a guitar amp and miking a guitar Amp
Posted: Tue Oct 19, 2010 3:32 pm
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Twinhit wrote:
Would I be wasting my money on an inline Impedance Transformer if I am planning on a mixer board anyway?


Possibly. Most mixers have both high-Z and low-Z inputs (at least on a couple of channels), but I would check the specifics for the board you're interested in.

All of my mics -- Shure SM57, Shure SM58, AKG D-1000E -- are low-Z devices. High impedance mics don't seem to be too common any more.

HTH

Arjay

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Posted: Tue Oct 19, 2010 3:37 pm
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OK it is not the right forum. However, you have an impedance balance matching issue.

The impedance of the mic has to adapted to input in order to deliver the right signal.

Usually dynamic mic have 100 to 600 Ohms impedance, then the input impedance is arround 2-10KOhms. These mics are very popular due to the fact they are less sensitive to parasits;

For other microphones a line matching impedance transformer will adapt to Line Input. I'm sure you can check on web for a solution.

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Posted: Tue Oct 19, 2010 8:27 pm
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Twinhit, I've used a couple of those Yamaha MG boards, when running sound for the school district musicals. They will accept the hi-Z and low-Z mics. Those boards are very user friendly and versatile. Although, I haven't run sound up at the schools for a couple of years, I'm sure they're still using them. If I can remember, I'll ask the keyboardist about their reliability, tomorrow night. She's the music director/ teacher for the district. Art

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Post subject:
Posted: Tue Oct 19, 2010 8:33 pm
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+1 on the Yamaha PA gear -- it's some pretty solidly-built stuff.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject:
Posted: Tue Oct 19, 2010 11:48 pm
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aclempoppi wrote:
Twinhit, I've used a couple of those Yamaha MG boards, when running sound for the school district musicals. They will accept the hi-Z and low-Z mics. Those boards are very user friendly and versatile. Although, I haven't run sound up at the schools for a couple of years, I'm sure they're still using them. If I can remember, I'll ask the keyboardist about their reliability, tomorrow night. She's the music director/ teacher for the district. Art


Thanks but.... looks like I've already landed a new mixer for pretty fair price.
It cured my mismatched impedance issue with the SM57
I'll be testing my two MXL condenser microphones next.
I got a Mackie 802-VLZ3. They didn't have the compact size I was looking for in Yamaha MG series.

I would call it a very nice utility mixer that can accomplish a little more than what I would have expected.

Some day, I would like to have something bigger provided the need is there. Allen & Heath, Yamaha, Mackie (Would love a Solid State Logic)

Here are some links to the MACKIE 802VL3 I picked up.

Where I bought it (Some good close-ups) - http://www.guitarcenter.com/Mackie-802- ... 1391874.gc

Mackie's product page - http://www.mackie.com/products/802vlz3/
You'll see links to owner's manual and hook-up suggestions. Not too bad IMHO.


Discussion comparing VLZ3 specs with an older version VLZ series
http://forums.mackie.com/scripts/forum/ ... 4;t=002703


When you google the model and reviews, it seems this mixer is in direct competition with the MG series mixers so... maybe I'll be ok.
It seems there's a trade-off between Mackie's VLZ series and the Yamaha MG series. VLZ seems to have a quieter pre while the MG has more in the EQ and an Allen and Heath seem to have the best of both.

When I bought it, I was suggested an Art Tube Mic Pre or Presonus Blue Tube mic pre . The trouble is, I needed 2 independent channels which they didn't stock and also, I am considering something that can handle more equipment as my soundcard is very limited on inputs (Mic, Aux Line In, Speaker out, Aux Speaker out) Hey... this is an old Soundblaster Live Value card from way back 1998. - just upgraded to XP from 98SE this year.

Anyway, back to the unit. It does seem well built but time will tell. Knobs and buttons feel very sure.
It's my very first mixer, I may have been able to better or worse but this is it for now - I hope to have fun and enjoy it.
Now... my next dynamic if not a second SM57 someday an Electro-Voice RE20 with a whoppin' broadcast boom and and and....
After that.... it's AKG B414 if possible otherwise a new 414 model may be in the cards.
After that, it's Neumann country: U47, U67 and U87
Coutant's has a nice collection of mic samples and info
Informative and fun learnin and listenin
http://www.coutant.org/contents.html


Gee, if I had everybody else's money, I'd burn mine.
:wink:


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Post subject:
Posted: Wed Oct 20, 2010 2:37 am
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Retroverbial wrote:
+1 on the Yamaha PA gear -- it's some pretty solidly-built stuff.

Arjay


Sorry I missed your response Arjay
Might have a read of my last reply above.

Durabilty should always be a consideration. I agree 100%
While solidly-built stuff doesn't necessarily mean indestructable
it definitely gives a product a fighting chance.

Kinda funny I just watched this video before seeing your reply.
http://www.youtube.com/watch?v=EVxOm3lh1rw
Please give that vid a watchin'.
While I dont' expect to be abusive, accidents can and do happen.
Last test should be a toss in the ocean. (I understand humidity, let alone water, is a terror to electronics.)


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Post subject:
Posted: Wed Oct 20, 2010 7:49 am
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The blonde poindexter needs eyeglasses AND a set of opto-visors?!?!?

(good thing he isn't a watchmaker)

:mrgreen:

At my age I now need glasses to read and I use my opto-visors when building models -- but I never wear both simultaneously.

At least not yet.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject:
Posted: Wed Oct 20, 2010 11:13 am
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Retroverbial wrote:
The blonde poindexter needs eyeglasses AND a set of opto-visors?!?!?

(good thing he isn't a watchmaker)

:mrgreen:

At my age I now need glasses to read and I use my opto-visors when building models -- but I never wear both simultaneously.

At least not yet.

Arjay


Noticed the opto-visors too, did ya?
And at my age, I just close my eyes and expect the worst.
If it ain't broke, fix it 'til it is.
8)


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Post subject:
Posted: Wed Oct 20, 2010 11:18 am
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Twinhit wrote:
If it ain't broke, fix it 'til it is.
8)


LMAO!

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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