Born to a Karliner family, R’ Avrohom Blesofsky escaped Russia on his own at age seventeen to avoid the draft. Arriving in America, he maintained his chassidishe dress and minhagim, despite pressure from relatives. 

R’ Avrohom would frequently daven in 770 and became close to the Rebbe. As a chazzan, he kept with the Karliner custom to sing the entire davening in his booming voice at the top of his lungs. 

Once, some chassidim complained to the Rebbe about his loud davening, which was different than the still and contemplative way Chabad chassidim were accustomed to daven.

“When he davens, you can hear every word,” the Rebbe replied.

(As told by his grandson R’ Avraham Ber Blesofsky – Lift Magazine, Issue 8, p. 27)