Follow up: I did find a three-pack of remote receptacles for <$30 on eBay. Plugged one into my Isobar box and it works flawlessly with my STA-9. Seems that the problem is solved. One thing, the receptacle itself is rated for 10 amps only. With high-efficiency speakers, such as Zu's, this probably won't be a problem. But, what about less efficient speakers? Will the 10 amp speed limit ever be a problem?