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Clipping Unterspannung BassBoost - Gefährlich für Verstärker?
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Ich sage Nein!
(german voice, english translation)
Is an amplifier dying from undervoltage, clipping or bass boost?
I say no! - as long as it is properly constructed.
1. undervoltage.
Every amplifier has a power supply, otherwise power greater than 18W/4 Ohm would not be possible.
The power supply switches the battery voltage to a square wave voltage, this is transformed and the higher voltage is rectified again.
This works almost loss-free, at low input voltage the output voltage drops, the amplifier makes less power. Nothing more happens.
The critical point is the gate voltage at the mosfets. The lower, the less cleanly the mosfets switch. More losses and heat are the result, up to the destruction of the MosFets.
This only happens with power amplifiers without a stable voltage for the gate control - they shouldn't even exist today.
Clipping.
If an amplifier clips, this means that the signal is greater than the power supply voltage and the peaks of the signal cannot be reproduced.
The peak current in a sine wave signal is identical to that in a square wave signal. However, the rms current increases. The consequence: With the same peak current through the mosfets, the RMS power is higher, up to max. factor 2.
The thermal load for the mosfets is lower because there are fewer signal components with loss (digital behaviour).
Loudspeakers are usually already deflected very far in this range, the coil leaves the magnetic field, the impedance drops. Impedance goes towards Re, the loudspeaker draws the maximum power from the power amplifier.
Well-designed power amplifiers have taken this into account in the dimensioning of the components.
3. bass boost
This is simply an EQ in the preamplifier. If set incorrectly, it can drive the amplifier into clipping, nothing more.
4. matching power / load capacity.
If the system is only operated in the clean range, the factor 1:1 can be used here. (Real power values that are also achieved in practice. Not just any numbers in the brochure).
If you are sometimes overconfident and the system has to withstand this, the power handling of the loudspeaker must be higher by a factor of up to 2.
Even a 100% clipping power amplifier can't produce more, whether music, sine or square wave, the loudspeaker doesn't care. It sounds bad, but nothing is destroyed.
Summary:
Well-designed components do not die due to undervoltage, clipping, bass boost or similar. This costs a few dollars more, and is unfortunately not apparent in any brochure.
(german voice, english translation)
Is an amplifier dying from undervoltage, clipping or bass boost?
I say no! - as long as it is properly constructed.
1. undervoltage.
Every amplifier has a power supply, otherwise power greater than 18W/4 Ohm would not be possible.
The power supply switches the battery voltage to a square wave voltage, this is transformed and the higher voltage is rectified again.
This works almost loss-free, at low input voltage the output voltage drops, the amplifier makes less power. Nothing more happens.
The critical point is the gate voltage at the mosfets. The lower, the less cleanly the mosfets switch. More losses and heat are the result, up to the destruction of the MosFets.
This only happens with power amplifiers without a stable voltage for the gate control - they shouldn't even exist today.
Clipping.
If an amplifier clips, this means that the signal is greater than the power supply voltage and the peaks of the signal cannot be reproduced.
The peak current in a sine wave signal is identical to that in a square wave signal. However, the rms current increases. The consequence: With the same peak current through the mosfets, the RMS power is higher, up to max. factor 2.
The thermal load for the mosfets is lower because there are fewer signal components with loss (digital behaviour).
Loudspeakers are usually already deflected very far in this range, the coil leaves the magnetic field, the impedance drops. Impedance goes towards Re, the loudspeaker draws the maximum power from the power amplifier.
Well-designed power amplifiers have taken this into account in the dimensioning of the components.
3. bass boost
This is simply an EQ in the preamplifier. If set incorrectly, it can drive the amplifier into clipping, nothing more.
4. matching power / load capacity.
If the system is only operated in the clean range, the factor 1:1 can be used here. (Real power values that are also achieved in practice. Not just any numbers in the brochure).
If you are sometimes overconfident and the system has to withstand this, the power handling of the loudspeaker must be higher by a factor of up to 2.
Even a 100% clipping power amplifier can't produce more, whether music, sine or square wave, the loudspeaker doesn't care. It sounds bad, but nothing is destroyed.
Summary:
Well-designed components do not die due to undervoltage, clipping, bass boost or similar. This costs a few dollars more, and is unfortunately not apparent in any brochure.
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