I recently changed my DA5ES for a Lex, and sold the DA5ES to a friend. He uses the "3rd room" for his patio speakers....I never did. I noticed last night that there was no sound coming from the center speaker while the 3rd room was on and the main room was playing a PCM source with Dolby PL II. I looked on the receivers front panel and the center was not present. When I turned the 3rd room to off, the center speaker started working again and reappeared on the front panel. Is this normal for this receiver? I thought the DA5ES has 6 amps. If there are only five, then the manual is misleading and must be talking about pre-amps. Thanks.