Anybody have any experience with these products? They are supposed to boost the line signal to the amp to as much as 8 volts. I am asking this for i have noticed that in order to get the same volume out of my speakers for the Rio when compared to my old Sony HU I have to turn the gain on the amps almost to full.

Here is the link to the product.

http://www.sounddomain.com/sku/PHOTLD22

Thanks,

Ed