Report Abuse. First of all - RCA's, Pre-amps, Pre-outs, or just Outputs are all common terms referring to a head units low/line level rca style outputs used to drive an amplifiers input.The most basic HU's just offer a single pair (left and right) of pre-amp outputs.eport Abuse. First of all - RCA's, Pre-amps, Pre-outs, or just Outputs are all common terms referring to a head units low/line level rca style outputs used to drive an amplifiers input.
An ideal cardio session should be around 45 minutes. If you lift weights before aerobic training, youâll only need 15-20 minutes of cardio. Youâll get the same benefits as you would do in 45 minutes without weight training.
Scenario 1 - Cardio after Weights. You walk into the gym and do a warm up on the treadmill for 10 minutes, but you don't want to do too much cardio because you reckon you need the energy to max out your weights session. Anyway, you heard that you'll burn more fat if you do it after the weights. Saves energy for weight lifting.