For over 25 years, Sound Projections has been combining powered speakers to create a "Wireless Companion Speakers".   Our philosophy is not to require you to spend upwards of a $1,000 to purchase a product that, when not in use, becomes a very expensive paper weight.  We recommend to simply purchase a second powered systems.  This is a larger investment initially, but when not using the unit as a Companion Speaker, it can be used as an independent system.