Picture of an old tape recorder

Humming:

      Humming Sound

Reasons: Ground loops caused by different parts of your audio system powered by mains with different earth potentials, noisy electrical equipment close to the audio cables connecting the PC to the Amplifier.
How to Check: Are all parts of the audio system and PC on the same power circuit? Is there any electrical equipment near the audio cables emitting any audible noise?  Are you using cheap domestic RCA cables?
How to Solve: Stop the player so the hum can be heard clearly. Then power off on any nearby equipment emitting noise. If the hum disappears move the emitting equipment, if possible, to another location. If there is no emitting equipment; power off the amplifier unplug the audio inputs re-power if the hum is still persisted, the cause of the problem is likely to be the amplifier. Try replacing audio cable with higher quality shielded cables (and replace the amplifier?).

HISSING:

      Hissing Sound

Reasons: Cable is too Long. Over long distances the audio level will drop and the signal will pick up noise. On the receiving end staff may turn up the volume if it sounds low which will also amplify the noise and be heard as hiss.
How to Check: Are you are using domestic RCA cables ? (the kind of cable you use to connect your CD to your music center which usually have white and red connectors on the end). Are they longer than a few metres?
How to Solve: Change the cable for higher quality one or use a shorter cable. Can the PC be moved closer to the amplifier? If so, move it and use a shorter cable.

Overlapping Music:

      Overlapping Music

Reasons: Sound-card/ sound-card driver fault, incorrect equaliser setting on amplifier or other equipment.
How to Check: Look at the equaliser settings on all of the equipment the music is passing through. See if low frequencies (or Bass controls) have been turned down.
How to Solve: Turn up low frequency settings on any equalisers and/or turn up Bass control on amplifier.
If this makes little difference try reinstalling sound-card drivers; for this part it’s best to contact BMAsia to assist you.

Audio Sounds Thin and Lacks Bass:

      No Bass

Reasons: Sound-card/Sound-card driver fault, Incorrect equalizer setting on amplifier or other equipment.
How to Check: Look at the equalizer settings on all of the equipment the music is passing through. See if low frequencies (or Bass controls) have been turn down.
How to Solve: Turn up low frequency settings on any equalisers, turn up Bass control on amplifier.
If this make little difference try reinstalling sound-card drivers, for this part it’s best to contact BMAsia to assist you.

Variable Level Audio:

      Variable Level

Reasons: Problems can come from any part of the system: settings on amplifiers, graphic equalisers, pre-amps, faulty cables or sound-card / sound-card driver faults.
How to Check: Are cables worn or old? Are audio connectors loose in the sockets? Is there an Audio Equaliser present?
How to Solve: This is difficult as most things in the signal chain can contribute the problem. In the first instance ensure settings on Audio equipment are correct, replace connecting cables that link the PC to the audio system. If this does not clear the problems call BMAsia for advice and assistance.

Note: When you contact support, please state if the variations are when the song is playing or between songs ie one song is louder or softer than the next.