Spector didn’t produce The Temptations, Smokey Robinson & The Miracles, or any other of the Tamla/Motown artists or groups. He used The Ronettes, Bobby B Sox & The Blue Jeans, The Crystals, Darlene Love, The Righteous Brothers, Ike & Tina Turner, etc, on his recordings, released mostly on Phillies Records (which he co-owned with Lester Sills).
Take the echo out of his recordings? His sound was much more than mere echo (the two echo chambers located under the parking lot of the Gold Star Recording Studio he used are revered by engineers---the best there have ever been. Brian Wilson tried to duplicate Spector’s sound, Dave Edmunds did brilliantly on his Rockfield Studio recordings, notably his Subtle As A Flying Mallet album). His "Wall Of Sound" was also the result of having multiple instruments playing either the same parts doubled or even tripled, or having closely-related instruments playing in different positions (1st, 2nd, etc.). He often had three bass players: electric, upright acoustic, and 6-string.
Then there is the fact that those recordings were made on a 2-track recorder; the echo was mixed in as the vocalists and instruments were being recorded. It’s impossible to remove.