Davies explained how the reviews and press coverage made it clear the show was "causing much more of a stir than most things did".
"These were the days before 'binge watching' so episodes went out weekly so there was a sense of a big build up.
"More and more people were talking about it as the weeks went on," he added.
Speaking about the infamous lake scene, in which Firth as Mr Darcy emerges wet-shirted and dripping from the lake of his country estate after an impromptu swim, Davies said: "I never meant for that to be a sexy scene.
"My thinking was all about giving an insight into Mr Darcy as the novel is written entirely from Elizabeth's point of view.
"I meant for him to dive in naked originally but somehow we lost that but we gained the wet shirt.
"I thought the viewers would see the scene as sweet and comical," Davies added.
According to Davies, Firth never escaped the impact of the role, although initially being "quite uncomfortable playing a leading man and a romantic hero".
Despite this, Davies said he "took on the role so well" and called it an "extraordinary performance".
"I'm absolutely thrilled that people are still watching it," he added.