I replaced this about 10 years ago and it's been sitting in the warehouse. Whether it's the built-in amplifier or not, the sound from the speaker outputs on the back cuts out and is also quiet. I connected powered speakers to the main outputs on the front and checked each channel, but only 2 channels produced no sound. Also, the red and white inputs are suspect, with low volume and sound cutting out. In addition, the return of each button is slow, and there are many places that seem to have poor contact. Since it's an old item, I think there may be other oversights, but I'm listing it in the hopes that someone who wants to repair or maintain it will be interested. Please understand that it is being sold as junk.