The phrase "a perfect echo" is correct and usable in written English.
It can be used to describe a sound that is reflected back with complete fidelity or to indicate a situation where something is mirrored exactly.
Example: "The sound of the singer's voice created a perfect echo in the empty hall, enhancing the beauty of the performance."
Alternatives: "a flawless reflection" or "an exact replica".
"It's a perfect echo chamber," Sergeant Hayes said.
He was full of cherub loveliness, barely talking, almost walking, a perfect echo of my husband's soul.
But Hankes said his comments were a perfect echo of the ideology espoused on neo-Nazi websites.
And what about that church, a perfect echo of Boyd Crowder's fundamentalist fever back in Season 1? I'm eager to hear these stories, absolutely.
The e-mail was a perfect echo of the type that Mr. Obama routinely sends out as he searches for cash.
I envisioned rattling up Route 7 trailed by a black cloud — and then running out of fuel at the 10th gas station without a diesel pump — as a perfect echo of those halcyon days.
The H transverse relaxation time, T2, was measured using a modified (perfect echo) CPMG pulse sequence (PROJECT - Periodic Refocusing of J Evolution by Coherence Transfer) that resulted in spectra without J modulation [ 39].
Mr. Bernal and Ms. Gainsbourg resemble a pair of fine-boned, exotic birds, exchanging tentative mating calls in their differently accented English (his tinged with Spanish, hers an eerily perfect echo of her mother, the British actress Jane Birkin).
Though at home he has created the sort of perfect echo of other places -- the Marais or a farmhouse in the south of France -- that only exile can produce, he denied recreating anything he had left behind.
In order to assign T2 values of different protons along the chains of OA and MO, the perfect echo sequence [ 39] was applied on a Bruker AVANCE III 600 MHz NMR spectrometer, at 298, 318, and 338 K. Peaks were assigned according to [ 40].
Garbarek and classical music's Hilliard Ensemble are winding up a 20-year partnership, and Temple Church's unusual circular nave was the perfect echo chamber for this quintet's ethereal sounds.
