Can you get sound if you are missing the central speaker?

Hello Ranasinghe, you must connect a JBL satellite for each Main L and R output (2 speakers in total)
Connect one JBL for each Surround L and R output (2 speakers in total)
The middle speaker, to the output of the Central channel and the subwoofer, if active or powered, to the RCA subwoofer output on the amplifier
This way you would have all the speakers connected in the Harman Kardon 130

Hola Ranasinghe, debes conectar un JBL sat?lite por cada salida Main L y R ( 2 parlantes en total)
Conectar un JBL por cada salida Surround L y R ( 2 parlantes en total)
El parlante medio, a la salida del canal Central y el subwoofer, si es activo o potenciado, a la salida RCA de subwoofer en el amplificador
De esta manera tendr?as conectados todos los parlantes en el Harman Kardon 130

You need to install a updated Sound Driver or you will need a new sound card

if the speaker is actually receiving signal and has sound, the next question is if the sub is self amplified or not. if it is check the amp in it. if not then check your unit to make sure the bass is not turned down and that the correct surround setting are there. there is also possibility that the show or item your listening too isn't outputting correct channels.

If a speaker goes "bad" it usually can not be fixed. Speaker systems use different speakers for different tones. This sounds like the speaker used for bass is not working. Check if there is a fuse in the speaker cabinet somewhere. Also, is there bass gone on both speakers?

Hook a graphic equalizer between the piano and speakers, and turn down all sliders above 8 kHz. Since the highest note of a piano is 4186 Hz (4.186 kHz), you'll still hear all the notes but cut the hiss. If the hiss is coming from the speaker's power amplifier (in which case the equalizer won't help), turn down the speaker volume and turn up the piano volume. Live instruments generally need some doctoring to sound good through high-quality stereo equipment, as they only produce a limited range of frequencies whereas good speakers reproduce a lot more - including hiss.

1st, if you want a new speaker(just the sub, not the cabinet), ask Mackie for the nearest dealer.
2nd, If you want to have the speaker reconed, I can recommend :

Central Florida Speaker
714 W. Smith
Orlando,FL 32804
407.423.6566

They do good work.

i have the subwoofer but not the speakers and sound touch control center, wires or guides due to fact that they are stolen. could you help me fix this problem? i love the old one as i do not want to buy another system.

CHECK FOR THR DRIVER'S IF ARE OK. IN DEVICE MANAGEMENT,

the only way is o replace the wires from end to end.. you may have to do some soldering inside the subwoofer and the satellite speakers