(Topic ID: 24704)

Data East speaker noise - ideas for a cure

By roc-noc

11 years ago


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  • 961 posts
  • 218 Pinsiders participating
  • Latest reply 20 days ago by 2x286ps
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#225 7 years ago
Quoted from Pintopia:

DMD Hum trough speakers SOLVED! Had the hum throughput my speakers in the display panel.
Removed the grounding straps from the two display speakers. No more noise. Problem solved.

Would you be able to take a pic and point out which components were moved or removed. If not, no problem at all. I'm going to try and experiment with it sometime this weekend.

Recently, I floated the sound board with nylon screws and washers, and I feel it made a slight difference for the better, but not enough to consider it a victory. Hoping the solution mentioned above is my golden ticket as well.

Thanks!

#227 7 years ago
Quoted from 0geist0:

I would imagine this is what he means.

Thank you, that's what I was thinking when I read it. I guess my question wasn't phrased thoroughly enough, as I was more curious to know where the straps could be moved to, or if they were simply removed altogether.

I definitely appreciate the pic and clarification.

#229 7 years ago
Quoted from 0geist0:

I would think that the strap would just be disconnected and left that way.
Speakers already have a +and a -
I don't think it would hurt anything

Great. Thank you for clarifying here. I'm going to try and get this done in the coming days. Fingers crossed!

#232 7 years ago
Quoted from davebart5:

Great. Thank you for clarifying here. I'm going to try and get this done in the coming days. Fingers crossed!

Ok, I tried disconnecting the ground braids from the speaker screws and unfortunately for me, the hum stayed. It did not decrease or increase in volume.

Last step for me is to replace the speakers in the backbox, as I have heard that does the trick for a lot of people. I'll eventually get to that since I've been meaning to enhance the sound quality of my TFTC to match the sub I have on it.

3 months later
#239 7 years ago

I forgot to update here in the past month or two. My TFTC had a loud hum with through the stock speakers. I reduced that by about 80% to a point where I stopped noticing it by floating the sound board with nylon screws and washers. I was cool with the results, case closed.

At the York show, I purchased a set of Data East Replacement speakers off the vendor who sells boards and parts in the Mayfair booth to see if I can enhance the quality of the TFTC music and speech. The speakers sound a little better than the originals, but the hum is now back full force and I'm not sure what to do from here since the sound board is still floated with those nylon screws.

I guess I'm back to the drawing board.

#241 7 years ago
Quoted from ThePinballCo-op:

See this is why I'm confused. If floating took care of the hum in the first place, why would replacing the speakers INCREASE the hum?
Something's not right.

Agreed, it doesn't make any sense. Now, the original speakers weren't completely cured of the hum, but I definitely got it to be lower than it is now. Maybe I'll mess with the speakers and associated screws some more.

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