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12" mids noise

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_Natty_ View Drop Down
Young Croc
Young Croc


Joined: 01 April 2007
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Post Options Post Options   Thanks (0) Thanks(0)   Quote _Natty_ Quote  Post ReplyReply Direct Link To This Post Topic: 12" mids noise
    Posted: 30 July 2019 at 11:34am
my rack configuration:
line in ---> mostec preamp ---> xta lms -->each amps
my electrical configuration:
a 32A to 6 16A cee,
r1: k10
r2: fx, mostec, cdj
l1: crest 9001
l2: turntable, fx, lights
t1: 12 "mids amp (AB class amp)
t2: one amp for 1 "and 2" mosfet ab class.

I have a big problem of background noise especially on the 12 "(180hz 1khz), and I can't understand where the noise comes from! When the signal is turned off just by switching on the amps you can hear this noise, I tried to change the amplifier but the problem remains , it seems to me a current noise, but how can I manage to "filter it"? I tried both to set the amps with lift and ground, but not much has changed, I also changed the signal cables from xta to amp but without results.
tips?
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dj jammin View Drop Down
Young Croc
Young Croc
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Joined: 10 April 2010
Location: southampton
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dj jammin Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2019 at 12:09pm
Is the noise there when you connect just amp to speakers (nothing going into the amp)? If not then work backwards, ie plug in the lms and try, then the preamp etc..
Reverence Sound system


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_Natty_ View Drop Down
Young Croc
Young Croc


Joined: 01 April 2007
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Post Options Post Options   Thanks (0) Thanks(0)   Quote _Natty_ Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2019 at 12:33pm
the noise is present when all is connected but no signal goin in... 
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monkeypuzzle View Drop Down
Young Croc
Young Croc


Joined: 25 January 2005
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Post Options Post Options   Thanks (0) Thanks(0)   Quote monkeypuzzle Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2019 at 1:49pm
When it’s all set up and making the noise take the cables out of mostec, does it still make noise? No? Mostec at fault, yes fault further down, now unplug other end of cables from mostec to LMS does it still make noise? No - cables at fault, yes, fault further down. Unplug rest of cables out of LMS. Does it still make noise? No- LMS at fault, yes faults further down the chain. Unplug signal cables from amps. Does it still make noise? No, cable fault , yes - amp fault.
blah blah blah blah blah......
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_Natty_ View Drop Down
Young Croc
Young Croc


Joined: 01 April 2007
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Points: 663
Post Options Post Options   Thanks (0) Thanks(0)   Quote _Natty_ Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2019 at 2:56pm
I will troubleshoot as u suggest at the first occasion...many thanks
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