Far down the price range from where Joefama is looking, both Welborne Labs and Wright Sound Company desing amps and preamps to work with 100-108dB horn speakers. They are extremely quiet with those ultra-sensitive horns and dead quiet with anything less. They are also extremely revealing and neutral.
There are quite a few amp companies targeting the high efficiency horn market specifically, they would be the best bet if absolute quiet is your highest priority. Gordon Rankin's Wavelength Audio comes to mind in the $12.5k-$19k(Silver wired transformers) range new.
There are quite a few amp companies targeting the high efficiency horn market specifically, they would be the best bet if absolute quiet is your highest priority. Gordon Rankin's Wavelength Audio comes to mind in the $12.5k-$19k(Silver wired transformers) range new.