Adding the word 'suddenly' doesn't give us much more idea of what you want to say. In what context was the sound heard?
The room was silent. Suddenly, a voice was heard [STRIKE]there was a voice[/STRIKE].
I can't off-hand think of a situation in which I'd feel the need to say There was a voice.
When the context calls for it.
I think suddenly doesn't go well with there was something.
A direct subject works better than a dummy subject following suddenly.
I just found this on Longman:
Suddenly, there was a loud bang.
Is this the same as 'Suddenly, a loud bang was heard no full stop here'?
No! Without wanting to get into the whole "If a tree falls in the forest and no one's there to hear it, does it still make a sound?" debate, saying that something happened and saying that someone heard it aren't the same thing.
If you have a question about the English language and would like to ask one of our many English teachers and language experts, please click the button below to let us know: