ConcertHall.php

class ConcertHall
{
  public function convert(Human $human)
  {
    $audience = new Xxxv($human);
    echo $audience->say()->toString(); // 'Xxxv!!!!!'
  }
}

Xxxv.php

class Xxxv implements Audience
{
  /**
   * @var Human
   */
  private $human;
  
  /**
   * @param Container $container
   */
  public function __construct(Human $human)
  {
    $this->human = $human;
  }

  /**
   * @return Voice
   */
  public function say()
  {
    return $this->human->say('Xxxv!!!!!');
  }
}