But if you want to make your own try this chip and get a design and sample from TI
TPA3144D2PWPR
6-W Inductor Free Stereo (BTL) Class-D Audio Amplifier with Ultra Low EMI and AGL
TPA3144D2 is not only fully protected against shorts and overload, the SpeakerGuard speaker protection circuitry includes an adjustable Automatic Gain Limit (AGL), an adjustable power limiter and a DC detection circuit for protection of the connected speakers. The AGL allows adjustment of the maximum output voltage without signal clipping for enhanced speaker protection and audio quality. The DC detect and Pin-to-Pin, Pin-to-Ground and Pin-to-Power Short Circuit protection circuit protect the speakers from output DC and pin shorts caused in production. The outputs are also fully protected against shorts to GND, PVCC, and output-to-output. The short-circuit protection and thermal protection includes an auto recovery feature.
The TPA3144D2 can drive stereo speakers with as low as 4-Ω impedance. The high efficiency of the TPA3144D2, 90% with 8-Ω load, eliminates the need for an external heat sink, and TPA3144D2 will be able to output full power on a 2-layer PCB.
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<0.05% THD+N at 1 W/4 Ω/1 kHz
• <65-µV A-wgt Output Noise
• Wide Supply Voltage Range Allows Operation
protection of the connected speakers. The AGL an adjustable Automatic Gain Limit (AGL),
- SpeakerGuard™ speaker protection circuitry allows adjustment of the maximum output voltage - adjustable power limiter and a DC detection circuit without signal clipping for enhanced speaker includes from 4.5 V to 14.4 V
I think the soft SpeakerGuard looks like it should sound like a Vacuum Tube Amp when limiting. TONY.