I am looking for a backup to my RH450 and may consider another RH450 after reading the following in its manual but I'm not sure exactly what it means by "even more power"...how would this work to provice more power? RH450 Manual: Linking Two Amps The break point may also be used to link two RH450 units together to achieve even more power. Use a standard ¼" jack instrument cable to connect the first RH450 PRE-AMP OUT (the upper) to the second RH450s POWER-AMP IN (the lower jack). Plug your bass into the INPUT jack on the first RH450 and adjust your sound using the controls on this RH450. Set the volume using the MASTER volume knobs of both amps. You now have tons of amplification power at your fingertips!