What you are asking for is simply not possible. if you want 100W into 8 ohms at 0.1% THD or less, you need higher voltages, and this means an SMPS
Hi
I had a car amp way back in the day that used a 12V powered high current output stage to drive an output step up transformer to match the impedence to the speaker. No SMPS. It was something like 60W + 60W and could be bridged easily. The name was Fourum or something like that. I suspect there are few chip amps that can handle a sub to any substantial power because of the high reactance of that kind of speaker. I've noticed that large currents and chip amps do not seem to mix well.
I had a car amp way back in the day that used a 12V powered high current output stage to drive an output step up transformer to match the impedence to the speaker. No SMPS. It was something like 60W + 60W and could be bridged easily. The name was Fourum or something like that. I suspect there are few chip amps that can handle a sub to any substantial power because of the high reactance of that kind of speaker. I've noticed that large currents and chip amps do not seem to mix well.
You could also just buy a surplus dc-dc converter and some extra filtering to open up higher power possibilities. At least you wouldn't have to build it from scratch.
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