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Hi, mics inputs are not working,thought it was the mics themselves,bought new ones, but not working either, so must be the input. the 2.5 fuse,is in tact. Could it be the whole electrical board? .

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Posted on Jan 02, 2017

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SOURCE: Korg pa800 mic input makes funny noise

First turn the unit off then rotate the input level volume control. If it feels loose pull up lightly on it as you do this. Also rotate all your controls that you don't normally use a lot. Chances are the pots are dirty. If that doesn't help you might want to check all the connectors inside the unit if you feel confident enough to go poking around. Other wise I suggest that you find a shop that will fix the problem. If you do go poking around make sure the units unplugged and that you have grounded yourself against static discharges. 

Posted on Jan 07, 2009

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SOURCE: Roland MV 8800 No inputs, phono

Hi, post on mvnation.com, they will be able to help.

Posted on Feb 07, 2009

rockdiarylv
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SOURCE: plugging line level into my crate TX15. all inputs sound distort

guitar amps are all set to a low Z resistance configuration. wich are made for guitar only. make sure you are using the right cables.
you need sheilded guitar cable not unshielded speaker cable in many cases these cables look exactly the same. look at your cable look for the words speaker or instrument. you need the instrument cable. if you still have that problem. then you may just not be satisfied with the quality of the amp it self.

Posted on Feb 27, 2009

  • 1 Answer

SOURCE: Hi i have djx 750 and i have connect the master

i have djx750 mixer, and i want to connect speakers to it,but the cable for the speakers are guitar jack leads and back of mixer are scart can i get a cable with guitar jack and scart on same lead??cheers

Posted on Dec 27, 2009

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SOURCE: Roland AC-60 Amp input impedances ?

I will solve the mystery...

The impedance varies depending on how you connect. It would be too complicated to explain the impedance to the average person.

From the schematic we have the TRS 1/4 inch jack having basically 100K and parallel 220 pf cap to ground EACH signal line and 10K resistance between. (The TRS jack if used disconnects the XLR and its components)

If one uses the XLR jack, one has an ADDITIONAL 100K each side in parrallel to ground PLUS an ADDITIONAL 2.2K resistor shunting between.

In ADDITION to the above, there is effectively 160K ohms to ground each side that is the input resistance to the input OP-AMP.

The effective impedance will depend on how and where you measure it.

Not sure what peizo you are using... For one on wife's violin we go into a X2 wireless which has about 1.6 Megohm. The receiver of course is fairly low impedance drive to the amp.

For the violin (Autolycus) pickup and others, severe distortion of the waveform existed when run directely into most amps and of course long cables worsened it at the high frequencies.

Posted on May 20, 2010

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The measured impedance of My wife's violin is on the order of 2 megohms.

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Most of the Focusrite mic preamps I looked at had input impedance around 5K ohms which is unsuitable for the piezo pickups.

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