Speaker Wiring Question

[Angry Ninja]

Hey guys,


I'm trying to splice in a third party sound source to play on the S2000 speakers, with a standard "red wire, black wire" output.  I've tried two methods...


1)  Tapped directly into the white wire and green wires leading to the top speakers.  Result:  VERY muffled and garbled  sound, can barely hear it.


2)  Tapped into the 2 inputs on the bottom speaker in the coin tray.  Result:  Very muffled if the machine is powered on, sounds perfect if machine is powered off, or if the existing leads are taken off of the bottom speaker, leaving only my newly installed ones.


I'm open to getting the sounds spliced in through either the top speakers or bottom speaker, whichever is easier.  Anyone have any ideas what I'm doing wrong?  Thanks

[DF777]

You didn't mention your additional sound source but it may not be compatible to your speakers.
You could damage the existing speakers and/or the sound card.

To be safe I would add independent speakers.

[Angry Ninja]

Sound source is just a 4.5v recordable speaker module.  Very small output.  Sounds fine when hooked up any of the speakers by themselves, if no power is running through them.  I think I'm tapping the wrong wires... simply tried tapping the red/black on my output module to the white/green wires of the slot speakers.  I think I need to wire in before the sound board (pre-amp) instead of after it, but have no idea which wires those would be.

[Merlin]

Hey guys,
1)  Tapped directly into the white wire and green wires leading to the top speakers.  Result:  VERY muffled and garbled  sound, can barely hear it.
2)  Tapped into the 2 inputs on the bottom speaker in the coin tray.  Result:  Very muffled if the machine is powered on, sounds perfect if machine is powered off, or if the existing leads are taken off of the bottom speaker, leaving only my newly installed ones.

It sounds like you're trying to connect your device directly to the speaker terminals on the S2K,
rather than mixing the pre-amp input signal. I'm not an electrical engineer but I don't think
bridging unmatched amplifiers is going to work very well. On my S2K the speaker in the coin tray
is a subwoofer and the dog ear speakers are for mids/highs, which are driven from separate amplifiers.

If you want to do it right I'd trace the signal and find it before it hits a bandpass filter. Break it out,
mix it with your line level signal (something like a 1v peak to peak amplitude, not 4.5v), and feed to the
built in amps.

If you want to do it dirty you could try some 1w diodes to prevent the other amp's circuit protection
from clipping your signal.

[foster]

The speakers in the S2k are not 8 ohn speakers
Ears are 3 ohm bass speaker is also 3 or 4 ohm
The final Amp IC is designed for automotive sound systems

 

[CommTech]

You would need an external mixer/amp to combine the two sound sources to one speaker output. 
You would also need to ...

• Match the output impedance of the amp to the impedance of the speaker you are using
• Make sure you do not exceed the power rating of the speaker you are using
• Pad down both input sources (from S2000 amp and your sound module) so they do not exceed the input of the mixer amp

The S2000 top speakers are both connected separately to the output of the S2000 audio amp module (Stereo), so if you want both speaker to work, you would need separate amp/mixers for each.
 

[Angry Ninja]

Hmmm... the sounds don't play at the same time, so I assumed I could splice it in, and either source could play through the speaker.  I guess not. 

[Merlin]

Hmmm... the sounds don't play at the same time, so I assumed I could splice it in, and either source could play through the speaker.  I guess not. 

You'll have bias even when there is no audible sound being generated by 1 input.. the good
news is that audio signals are DC. Try some diodes? Anyone have input on that strategy?

[CommTech]

... the good
news is that audio signals are DC. Try some diodes? Anyone have input on that strategy?

Audio Signals are AC not DC. Diodes will not work.