the solution is at
www.davidnavone.com
look for line drivers, they have some that are adjustable up to 10v output, used by the sound quality and sound pressure wizards, about 165 or 145 usd a pair, if going for 5.1 sound you will need 3
Once my screen is installed and i can test the install I may have the same prob as you and need to get these, email david at the site, he will help you out 100%
Cheers