Amazon.com: Sennheiser RS 180 Digital Wireless Headphone System with Automatic Level Control and Adustable Balance Control: Electronics ttp://www.amazon.com/Sennheiser-RS-180-Headphone-Automatic/dp/B002TLT10S/ref=sr_1_1?ie=UTF8&s=electronics&qid=1259390411&sr=8-1 $349.95 Pre-Order 国産勢と比べると割高感は否めないが、オーテクのアレを思えば許容範囲ではあるか。