Audio for the loft has been sorted out! I added a Realistic STA-150 Reciever (along with a pair of matching Realistic speakers) to drive my refreshed Zenith Circle of Sound speakers. The receiver sits behind a Chromecast audio and drives all four speakers beautifully! The gear looks great and souds even better. I picked up an inexpensive but useful media cabinet until something better becomes available. I need to tweak the doors a bit to declare the project complete but I'm quite happy with this as it sits.