ARC says that both their amps and preamps sound better with the top removed or with a acrylic cover. I just don't like the acrylic covers. I have the standard steel tops and just run both my amp and preamp without the tops. They run a little cooler with better air flow. When turned off I put black towels over them to keep the dust out. Though I am thinking of having custom covers made from a ham radio cover place to replace the towels.
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