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.
  Find out what is the most weight you can lift for 1 rep   calculate 70% - 80% of that weight and you should be able to use that amount of weight. If you can lift 20 - â¦ 25 reps at a time then you have found a good weight.Be sure to re-evaluate yourself every 2-3 weeks. 5 people found this useful. Find out what is the most weight you can lift for 1 rep   calculate 70% - 80% of that weight and you should be able to use that amount of weight. If you can lift 20 - â¦ 25 reps at a time then you have found a good weight. Be sure to re-evaluate yourself every 2-3 weeks. 5 people found this useful.