Numark TTX1's Grounding Problem

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dj sleeper

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An extremely experienced DJ told me about how easily the ground connections wore out on the TTX1.... I didn't listen to it and bought one anyway.

So my setup currently is ttx1.1200.pmc06.jbl eon's

after doing two parties with this setup, that DJ appears to be correct.

the ttx1 is perfect for practice sessions and even small house parties, but the last two big parties i did, where i had to really crank it, after an hour or two of mixing, the humming starts on the ttx channel, and only when the fader is moving over into that channel or fully opening that channel. it gets progressively worse and worse as time goes by, making it impossible to make a clean mix, and pissing me off extremely....

the channel connected to the 1200 is fine....

for the last party i did, i borrowed a friends technics, used that instead of the ttx, and everything was fine....

i have the ttx plugged into the line in.... yes i did switch it to the line option on the bottom of the table. could it be that numark didn't design the ttx's line capabilities for party-like situations? i highly doubt it.... i think it's a defect in all ttx's......

anyone have a similar experience? ideas and help is appreciated
 
An extremely experienced DJ told me about how easily the ground connections wore out on the TTX1.... I didn't listen to it and bought one anyway.
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I don't know what your talking about.
The TTX1's are self grounding...It even tells you on the bottom of the deck that they don't need a ground wire
 
Pase said:

I don't know what your talking about.
The TTX1's are self grounding...It even tells you on the bottom of the deck that they don't need a ground wire
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Word... i read this and was like... uhh what is the guy talkn bout?

And his assumption that its a defect in all ttx1s is wrong since i have 2 that have no problems...
 
sounds more like your needle/cart if ballsd, or else a short somwhere else.

oku
 
Are you using Shure m35x carts? And are your TTs plugged into the same surge protector or circuit as a computer or something?
-Peasant Nikon
 
I know the table's self grounded....

...... but i'm still getting this humming sound.... it's not the cartrige or stylus because the next night, i used the same exact cartridge and headshell with a technics and i had no problems

alright, i guess my main question is has anyone used the ttx with the line option plugged into the line ins, for a 4-5 hour party, playing music to a 200+ crowd, and had no humming problems?

becaues yea, the ttx works fine when i practice with them. i only have the humming problem when i'm doing huge parties and i'm running the mixer through jbl eons....

and no it's not my speakers... because there's only humming when the fader opens up the ttx channel, and ive used two different sets of speakers.... and the same problem comes up
 
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Peasant Nikon said:
Are you using Shure m35x carts? And are your TTs plugged into the same surge protector or circuit as a computer or something?
-Peasant Nikon
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i'm using stanton 680EL cartridges and the TTX might have been plugged into the same surge protector as my laptop
 
anyone?????

dj sleeper said:
alright, i guess my main question is has anyone used the ttx with the line option plugged into the line ins, for a 4-5 hour party, playing music to a 200+ crowd, and had no humming problems?

becaues yea, the ttx works fine when i practice with them. i only have the humming problem when i'm doing huge parties and i'm running the mixer through jbl eons....

and no it's not my speakers... because there's only humming when the fader opens up the ttx channel, and ive used two different sets of speakers.... and the same problem comes up
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Yes. I have. No. There were no humming problems or any other problems.
 
I think the number of people that have used ttx1s for over 5 hours to crowds of people over 200 is probably somewhere in the in thousands.

Laptops connected to sound systems will cause strange issues, especially since most of them come with un-grounded power supplies.
 
any other ideas, other than isolating the ttx and the laptop?

and if it's the laptop causing the problem, how come my technics channel isn't acting up?
 
could be something to do with u running the ttx thru the line rather than phono, id assume any interference would be multiplied by the linein.

oku
 
Might be RF interference from the laptop affecting the TTX's A/D converters when you're using the line out. Cell phones and many other electronic items will also be issues. Move the laptop physically away from it and use an isolated line. You could also try getting a plug adaptor without a grounding plug (third pin) and try it on the TTX's AC cord. Just don't let yourself get electrocuted if somethings spills on the deck. If none of this works, call up Numark, talk to the support people and explain the situation to them.

By the way, why would you think this was a problem on all units if you just own one?
 
thanks for the tip

i thought it might be a defect because this dj i really respect told me about it a long time ago...

but i guess other people don't have problems, so that's good.

i'm glad there's no defect.
 
Consider that a decent phono to line level preamp costs $150 to manufacture! and that one comes built into a $400 turntable...

Does the hum exist when using the phono option?
 
i don't know

i only have used the ttx as a line table

but the next party i do

i will isolate the ttx, use it as a phono table and isolate my laptop....the thing is, the onlyyyyy reason i bought a ttx was cuz it had a pitch lock.... if i can only use it as a phono table than i'm definitely gonna sell it.
 
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The TTX1 one really doesn't have a phono preamp built in. What it has is a A/D converter that outputs at pro line level.
 
The TTX1 one really doesn't have a phono preamp built in. What it has is a A/D converter that outputs at pro line level.
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it's got to have some amplifier circuitry. you can't simply convert the low analog signal from the cartridge to digital and have it be at standard line levels. i don't own a TTX1, but looking at the schematic of the outputs, the digital is separate from the analog outputs altogether. the analog outputs have a line/phono output switch suggesting a built in phono preamp. - jeff h
 
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