A year before, Google introduced an app named the Voice I of Google Assistant that featured a robotic voice similar to a female’s voice. But, from today, you have an option to choose among the two voices, i.e, the previous voice or a similar male robotic voice. Google dubbed this new feature Voice II.
You can access this new feature from Assistant on Google Home and on phones. It is very easy to set a male voice. You need to go to Settings >Preferences > Assistant Voice on your phone Assistant or Google Home app.
You will have only a single Assistant on all the devices as the settings are between the Home app and on-device Assistant.
The new voice will be made available for everyone, providing all your Google and Google Home apps are updated.