Harold Pinter’s eerie tale of two assassins weary of their profession and Edward Albee’s case study in urban isolation have been staples on the classroom/storefront/loft/basement circuit long enough to have lost their immediacy even for young actors. But rather than rely on time-tested interpretations, Signal Ensemble Theatre builds its productions from scratch, and the discoveries the company makes are amplified by exacting, astonishingly expressive performances. Ultimately the process of unearthing the human vulnerability and despair in the texts revives the menacing urgency of the questions these playwrights posed nearly half a century ago. Through 9/3: Thu-Sat 8 PM, Sun 3 PM, Chopin Theatre, 1543 W. Division, 773-347-1350, $10-$15.