New Astro City audio problem

I get one New Astro City just yesterday and it is like new bytheway I get not good sound from the speakers, basically there is some there is a low buzz also when the game runs in demo without demo sound. Its more noticeable with some pcb in mono, example CPS1 and CPS2. Maybe the speakers are preamped.


Please help!

I cant get stereo sound from my MV-1 motherboard on New Astro, I have tested the pcb in my old cabinet and the sound come out very good in stereo from both speakers.
On new Astro City the sound come out from one speaker only, the strange thing is that I have wired the speakers directly to stereo output, may I know whats I have wrong?

If the cab is REALLY wired for MVS and if the board gives stereo on another cab, then it must be a faulty speaker. Try replacing it...

try switching the speaker+ wires off the harness.....

IF ONLY the same speaker works, you know that the other speaker is wired incorectly....

If ONLY the other speaker works, then you know that the board has a problem.

My guess is that the - terminal of the non working speaker is not wired to the ground.....

Finally I got stereo sound but overall quality isnt still good. Really dont think that I have foult speakers because I never found ones on a new cabinet. Maybe there is a problem with power supply and expecially in 12Vline.
On Sega Power supply there are labeled those value: imput AC:90V-132V
output
5V7A
12V1.5A
-5V1A
But I have tested it when the game running and I get 5.00V on 5V line , but 11,40V only on 12Vline. Basically I turned up the power and obtain 12.00V when 5v line its 5.45V. I have tested always with whyle game running.

Anyone have some advices?