[CrazyElecE]

It depends how you wire it, where it gets it's power from and when it can be switched on, etc.

Pulse bar has 3 wires: 12V ignition, 12V battery, and ground

How much power does the sound bar use?

Also IME, it's best practice to wire audio sources (both positive and negative) directly to the battery to avoid ground loop and other noise issues related to wiring.

 

[CrazyElecE]

400W is probably the measure of the "sound" of the system and not a true energy power rating, otherwise it uses over 30A. Does it come with an inline fuse on the power wire, that usually gives you an idea of how much draw it will have?

 

[CrazyElecE]

25A would be way too much for the ignition source so the only options are battery source direct, or through relay controlled by ignition - just to clear that part up.

As for connecting to the lines on the bus bar, that's no different than using a pulse plug. I'd personally not hook it up that way, but you can always change it later if it does end up with a noise issue.

 

[CrazyElecE]

Could using a relay controlled by the ignition work? Then the radio would still be hooked directly to the battery.

Yes, hence

25A would be way too much for the ignition source so the only options are battery source direct, or through relay controlled by ignition - just to clear that part up..