The phrase "audible speed" is correct and usable in written English.
It can be used in contexts related to sound, audio, or speech, particularly when discussing the clarity or pace at which something is heard.
Example: "The narrator's audible speed made it easy for the audience to follow the story without missing any details."
Alternatives: "perceptible pace" or "hearable rate".
And I can't recall a convertible at any price whose audio system is this, well, audible at highway speeds with the top down: The crystalline eight-speaker Bosystemtem is, unfortunately, available only on the deluxe Touring model.
The original was made on a 78 r.p.m. recording marred by fluctuations in speed and audible clicks and pops.
In that instance, the board recommended that the Federal Aviation Administration consider requiring that planes give audible warning of deteriorating speed before the stick shaker goes off.
A separate 2008 study from Western Michigan University found that hybrids and conventional vehicles are equally safe when travelling more than about 20 mph, because tire and wind noise generate most of the audible cues at those speeds.
There must have been at least prominent visual warnings to reduce speed, if not audible warnings and an electronic speed supervision system," he said.
At 100 mph the V-12 isn't even breaking a sweat, and because the cabin noise is so dampened, a conversation at this speed is easily audible.
Critical reception of the album was mixed, Dawn wrote the album has "a raw sound" calling it "an audible treat for thrash and speed metal fans".
The newspaper Dawn called the DVD "an audible treat for thrash and speed metal fans", he went on to compliment drummer Joey Jordison, stating that he "structures his beats and percussions in a very traditional thrash set-up, almost as well as (dare I say it) the great Dave Lombardo of Slayer fame".
There was much celebration this morning when T-mobile fired up their 4G network in a further 6 US cities. Residents of Chicago, Ill.; Colorado Springs, Colo.; Ft. Wayne, Ind.; Louisville, Ky.; and Raleigh-Durham and Wilmington, N.C were heard to let out audible cries of joy when the download speeds on their HSPA+ handsets reached peak speeds of nearly 12mbps and average speeds of 5mbps.
My TrafficMaster Smart Nav system also has an audible bleep system that advises me of speed limits when cameras are around.
