The phrase "audible murmur" is correct and usable in written English.
It can be used to describe a sound that is faintly heard, often in contexts related to speech or background noise.
Example: "In the quiet room, an audible murmur of conversation could be heard from the adjacent hall."
Alternatives: "soft murmur" or "faint murmur".
There was an audible murmur of satisfaction when the telegram from Pretoria was read by the Bishop of Stepney".
Voices are often kept to a just audible murmur, and the Hollywood sheen of the show's big-name stars, Liev Schreiber and Scarlett Johansson, has been dimmed to a matte finish.
And then, his mien grave and gaunt, Clark said something that produced an audible murmur in the room: "There is no way this administration can walk away from its responsibility for 9/11.
After Democrats produced the needed votes, some Republicans then cast their votes for the Pentagon measure, drawing an audible murmur of disapproval from Democrats who considered that bad form.
Examination showed an oral temperature of 40°C, blood pressure 95/55 mm Hg, and no audible murmur.
Indeed, 10 years ago it seemed to me thronged with voices like a beehive, but this time only one speaker was audible – murmuring everywhere, yet also talking more directly whichever speaker I approached, as if vouchsafing something secret just to me, rather like the interplanetary message the speaker claimed to have received.
The cardiovascular exam demonstrated a regular rate and rhythm with no audible murmurs, gallops, or rubs.
Although none of the animals in this study had audible murmurs, a small number of sheep and goats had evidence of physiological pulmonary, aortic and tricuspid regurgitation.
Two goats had mild tricuspid regurgitation and two sheep mild mitral regurgitation diagnosed using CFD; these were not associated with audible murmurs or any notable structural valvular abnormalities and thus the animals were not excluded from the study.
A typical heart murmur for chronic valve disease was noted in most dogs with a positive diagnosis, however there were 20 affected dogs with no audible murmurs present, all were dogs with mild disease belonging to ISACHC class 1 (Table 6).
Twenty one critically ill patients with pneumonia (17.1%) had active cardiovascular disease on ICU admission, 7 had atrial arrhythmias, 5 congestive heart failure, 4 ischemic changes on electrocardiograms, and 5 had symptomatic valvular heart disease identified via audible murmurs in the emergency triage areas and confirmed through echocardiograms performed in ICU.
