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By Pro-Logic Technologies
Audio distortion is one of the most frustrating and diagnostically challenging faults in audio systems. Unlike a dead channel (which presents as a simple binary — sound or no sound), distortion exists on a spectrum: from a barely perceptible harshness at the top end to severe crackling, buzzing, or clipping that makes music almost unlistenable. It can be caused by a fault in any component in the signal chain — the source, the preamplifier, the amplifier, the speaker, the cables, or the room. Pro-Logic Technologies provides expert audio distortion troubleshooting services across Nairobi, systematically identifying the cause and applying the correct repair.
Types of Audio Distortion
Understanding the type of distortion is the first step in identifying its cause.
Harmonic distortion — additional harmonics of the original signal are added by a non-linearity in the circuit. Odd-order harmonics (3rd, 5th, 7th) are particularly unpleasant to the ear and are characteristic of transistor output stages operating outside their linear region. Even-order harmonics (2nd, 4th) are less objectionable and are characteristic of valve (tube) amplifiers. Harmonic distortion can be caused by failing output transistors, incorrectly biased amplifier stages, failing capacitors, or overloaded circuits.
Intermodulation distortion — two or more frequencies in the signal mix in a non-linear circuit to produce sum and difference products not present in the original signal. This manifests as a harsh, grainy quality, particularly noticeable on complex musical passages. Causes are similar to harmonic distortion.
Clipping — when an amplifier is driven beyond its maximum output level, the waveform is clipped (the peaks are flattened). Clipping produces a harsh, buzzing sound and can rapidly damage tweeters and compression drivers. Clipping is often caused by amplifier gain settings being too high, volume being turned up beyond the amplifier's capability, or an amplifier that has lost output capacity due to a fault.
Mechanical distortion — rattling, buzzing, or intermittent distortion caused by a loose component within the speaker cabinet, a damaged driver surround, a voice coil rubbing in the gap, or a loose port tube. This type of distortion is often present only at specific frequencies or volume levels.
Ground loop distortion — a persistent hum or buzz caused by a ground potential difference between components in the system. Ground loops are common when audio systems are connected to multiple mains outlets on different circuits, or when a cable television connection is introduced into the system.
Our Diagnostic Process
Pro-Logic Technologies traces distortion faults using a systematic process of elimination. We substitute components, use signal injection at different points in the signal chain, measure harmonic distortion with an audio analyser, examine output waveforms with an oscilloscope, and listen carefully with reference recordings to characterise the distortion and identify its source.
Once the source is identified, we carry out the appropriate repair — whether component replacement in an amplifier, driver repair in a speaker, ground loop elimination, or cable replacement. All repaired equipment is tested with a distortion analyser before return to the client to confirm that the fault has been fully resolved.
For expert audio distortion troubleshooting in Nairobi, contact Pro-Logic Technologies today.