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RE: Certainly of the 4 30-to-60-Watt SETs I tried...

30 W is 14.7 dB more than 86 dB SPL/1W/1m.
In a normal listening room (15-30 square meters, medium wall absorbption) this means than you can easily get more than 95 dB SPL.
The comfort zone for 90% of listeners is 70-75dB SPL average, 85 dB SPL peak.
Above 80 dB SPL hearing is temporarily impaired.
You may desire more than 15 W just to boost bass in case your speaker cuts 6-10 dB below 80 Hz (which is a common problem).
After many years of listening I use a bass-high loudness circuit of my design or an equalizer to compensate for the ambient bass-high loss and I do not need more than 10-15 W.
I use both OTL and standard PP.




Omnes feriunt, ultima necat.


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