I purchased a top-rated multi-channel home theatre receiver manufactured by Anthem. The product is simply great. The only downside is configuring it for the best possible soundscape in one's home theatre viewing room. While the receiver comes with a microphone, it does not come with the adapter to plug it into the receiver. This must be ordered and purchased directly from the manufacturer. Also the configuration is done by laptop computer which must me attached to the receiver. Configuration requires a special software computer program. Again, this must be purchased from the manufacturer. Then one must install the program and learn how to use it.
Obviously all this is beyond most consumers.
As a service to their customers, Audio Video Unlimited, for a fee no higher than merely the cost of the adapter and and software (should one order them from the manufacturer), will come to one's house with all the necessary equipment and spend an hour or so configuring the receiver to give the best possible sound in one's home. That counts as truly good customer service. My thanks to Audio Video Unlimited for doing this.