Every now in a while, we get comments and e-mails from newbies who think about car audio particularly and like to rock out to loud music - really loud & screaming tunes! One individual recently asked us: “I want to rock out loud, but How can I use 2 amplifiers with 1 power wire as much as I need to? Well, how about hooking only one amplifier instead? It’s not that hard at all with a little bit of extra work, planning, and, more importantly, time. You can easily listen to hard-core bass beats in your car by using and wiring two or multiple amplifiers in just a single car audio system.

How you connect the cables is most crucial, and an important thing to consider when wiring in multiple amplifiers is how you are going to hide and organize power cords and how each amp is grounded with its own dedicated cable. You should rather use various coolers instead of the air conditioner because these are noise-free, but they need more power consumption than all, so keep an eye on its size and lot demand of power.

Yes, That is correct, and you can install as many amps in a car audio setup as you want, but Keep in mind that your electrical system must be according to the task. If you plan on adding more and more of these amps, they take out too much power. You have to upgrade your stock electrical system because it is being overloaded. One symptom of amplifier overloading a flicker or dimming headlight occurs because it’s not getting enough capacity from your alternator/battery/etc.

Whether it’s better for you to use many amps or one multi-channel amp to operate your speakers and its totally depends on a comprehensive variety of factors and also including what important thing you’re trying to achieve and Depending on the circumstances or preferences mostly important is like the total amount of vacant space in your car and your budget.

A subwoofer is an essential part of a modern sound system, and not only will it shake the floor, but it also brings balance to your other speakers because it gives you all-important low frequencies, which are particularly hard to reproduce on small drivers. In the case that you want to enjoy the best possible results from your bass, we recommend wiring multiple amps to get the maximum speaker output possible.

When determining your amp needs, you will likely need to consider the following questions: How many speakers do I need? How much wattage can each speaker handle without blowing it? What music genre or type of movie will be played most often through my system? The first question is especially important because this will ultimately determine how many channels you need. As you might imagine, larger speakers and/or ones with more robust power handling ability require larger amplifiers.

How to Hook up 2 Amps With 1 Power Wire

While Wiring One or more amplifiers, You have to deal with three essential elements that we have given below.

  • Power wire
  • Ground wire
  • Remote turn-on wire

How To Run The Power Wire:

When you’re going to install a second amplifier in your car, I explained in detail below how you should attach each of these wires. When it comes to planning power for your sound system, you have two options: either run separate cables for each speaker or run a single cable that feeds all of them. Whichever option you decide, do ensure that they’re thick enough and made out of the right kind of material to allow the amps to operate without putting too much strain on any given wire.

The other option is to have one long, thick speaker cable which will be used for both the low-frequency section and the high-frequency section: there are many different cables on the market nowadays that allow for this sort of setup, but not all of them can carry enough current -if you don’t know what you’re looking for by sight, ask an expert as you don’t want any risk of damaging your precious sound equipment!

Your amp’s total power draw needs to be accommodated by the size of your power cable. That means if you want to play your music at max volume, you want to make sure that the wire gauge is big enough that it can carry all of the power like a river carries water. Otherwise, it can get jammed up. For example, if your car’s amplifier wiring kit is 8 gauge, the power wire needs to be able to accommodate current from all of your amplifiers simultaneously. To do this, the wire must be larger than recommended for any one of your amplifiers.

For instance, if you have 2 amps and 3 gauge wire is a recommended size for both of them separately, it would be ideal to use 4 gauge wire when running both cables together since it’ll suffice for the combined draw at once. The same philosophy applies whether there are 1 or 14 amps in your system (as long as the total amp output adds up to the power that can be supplied by standard 12 gauge cable).

The best and neatest way to wire multiple amplifiers to a single power cable is with a distribution block. Distributing an electrical circuit from a single input source to several devices in the branch circuit, an economical and convenient way of distributing the current will allow for efficient usage of energy.

When wiring multiple amplifiers, it is important to know the danger of not having an adequate power source. And while heavy gauge wire is much preferred, the size may prove to be an issue because if all of your amplifiers are close together, they could drain electricity from one another if they all have a large current required by them. So what you can do when needing to connect multiple amps is to use a distribution block, which allows for a circuit’s power source to be sent out into separate fuses connected along with the rest of the ground and hotlines. ​

How To Run The Ground Wire:

To reduce interference in your system and avoid ground loops, connect the grounds for multiple amplifiers to one central grounding point. A special distribution block called a ground bus is used to achieve this. To do this, connect each of your amplifiers directly to the ground distribution block.

Each amplifier’s ground cable should be attached to the bus' 8-pin connector with a chassis ground strap connected from the bus to bare metal on the chassis of your vehicle or trailer. The common ground point should be cleaned before being grounded and not used for audio grounding purposes!

It must be noted that your amp’s ground wires should all be exactly the same size as the power wires they are attached to. Furthermore, the cable you are running between your ground distribution block and your grounding point should be of the same exact size as that which runs between your battery and power distribution block in order to ensure smooth, even current flow.

Run Remote To Turn-On Wire

The ‘Blue wire with a white stripe’ is called the remote turn-on wire (RTO) that plugs into the back of the head unit. It’s optional but recommended since it will tell your amp to power on when the head unit is turned on. However, there are certain circumstances when the signal might be too weak or strong and end up frying out your speaker because it sends too much voltage; this is why sometimes you’ll have an amp in your trunk even though your stereo system’s audio output is in the dashboard. But there’s a way around having both with these wall-warts! A great way to bypass this issue is to connect the “turn-on” leads from your amps to a relay, which is triggered by your head unit. You can also use a 12v relay to run and turn on multiple separate amps at once. When people think of a relay, the first thing that pops into their minds is an electromagnet. But it’s important to know that a relay has a lot more functions and uses than being used exclusively as part of an electromagnetic circuit. A relay is an electromechanical switch that uses electricity to trigger a larger electric current. You can say, in other words, that relay converts a small amount of electrical current into larger electric currents. It’s important to understand that relays aren’t polarized circuits because their control circuit doesn’t “ground” or “earth.” The technical name for a relay is normally given as simply an electromagnetic relay (or electromagnetic switch).

What To Do About Speaker Wires:

The last step of connecting multiple power amplifiers to one source is to attach the head unit to the amplifiers. When connecting multiple amplifiers to one source, a few different options are available to you. This should be done according to your head unit’s outputs. If you have a head unit with multiple preamplifier outputs, then you can connect each output directly to one of your amplifiers.

If you do not have multiple preamp outputs on your head unit, then you should check with the amplifier, as some amplifiers are equipped with RCA pass-through circuits that allow you to connect multiple amps together. But if that isn’t the case with your setup, it’s not a big deal - putting an RCA patch cable on each of your amplifiers' “output” or “line in” connections will allow the signal to travel through each amp without any alteration. If your stereo unit doesn’t have a preamp output, you can use an RCA splitter cable to split the signal between two amplifiers. Similarly, if your amplifiers don’t have a pass-through capability, you will require Y cables to split the signal. You can follow all the steps, and if you follow, you can reach out towards the end as per the diagram.