Wiring Mono Amps Having Two Terminals

Norvan Martin
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Monoblock amplifiers are single-channel amplifiers that are often used for subwoofers. Since subwoofers are single-channel, monoblock amplifiers often have a single channel for connecting the subwoofer. However,  many monoblocks come with two sets of speaker terminals (two positives and two negatives).

For this reason, many people believe these are two-channel amplifiers. However, that is not the case. Even if a monoblock amp has two sets of speaker terminals, they are not two-channel, they are still single-channel monoblocks with dual outputs for connecting two subwoofers. 

This means, that when you need to connect two subwoofers, each subwoofer can connect to its terminal. Here is the standard setup:

Wiring a monoblock amaplifier having two terminals

The reason some manufacturers build their monoblock amplifiers this way is that many people will try to cram the wires from two subwoofers into a single terminal. If the wire gauge is thick, the wires can easily become loose. The additional terminals give you some more flexibility. 

So, if you were asking why my subwoofer amp has two sets of speaker terminals, that is the answer so that you can connect multiple subwoofers.

Good examples of monoblock amplifiers with two speaker terminals are listed below:

Skar Audio SKv2-4500.1D Monoblock Class D MOSFET...
  • Competition Grade SPL Class D Mono black MOSFET Car Power Amplifier
  • Peak Power at 1 Ohm: 7, 400 Watts | RMS Power at 1 Ohm: 4, 500 Watts
  • Stable at 1 Ohm, Frequency Response: 15Hz - 270Hz
CT Sounds CT-700.1D Compact Class D Car Audio...
  • Car audio amplifier with 700 watts RMS power at 1-ohm load (14.4v); 380 watts RMS at 2-ohm load (14.4v); 200...
  • Small footprint and compact chassis makes this mono amplifier easy to install in any vehicle or car audio...
  • Engineered to be the most efficient car monoblock amplifier in its class so that you can get the most out of...
Skar Audio RP-1200.1D Monoblock Class D MOSFET...
  • Class D MOSFET Monoblock Power Amplifier
  • Peak Power at 1 Ohm: 1,600 Watts | RMS Power at 1 Ohm: 1,200 Watts
  • Frequency Response: 20Hz - 250Hz, On-board Bass EQ Switch with +6 or +12dB boost at 45Hz

In this case, each subwoofer gets its connection and it also allows you to easily connect additional subwoofers. 

monoblock amplifier with two speaker terminals

A mono amp with two speaker terminals and a full-range speaker is also a good option if you don’t have a subwoofer. 

Here are the steps you should follow to wire your woofers to your amplifier that has two sets:

Before we continue, if you are wiring a subwoofer, you can check out our guide on how to wire 2 subs to a mono amplifier

Wiring Mono Amps Having One Terminal

You can also wire monoblock amplifiers having one terminal to your multiple subwoofers by simply connecting the positive cables from each subwoofer to the positive terminal of the amplifier and the negative cables from the subwoofer to the negative terminals.

This is called a parallel connection and it lowers your impedance to half. 

Quick Overview

Here is a quick overview of how you can connect mono amps having two terminals in a series of parallel:

Parallel Connection:

Here is the easiest way to do it, just wire the two positive terminals of the speakers together and then to the mono amplifier.

In addition, wire the two negative terminals of the speakers together and to the mono amp. This is called a parallel connection and will account for half your impedance. 

conect monoblock ampifier witgh 2 terminals to 2 speakers or subwoofers

Parallel Bridged Connection:

Wiring Mono Amps Having Two Terminals - parallel bridged

Series Connection:

Wiring Mono Amps Having Two Terminals - series

Step 1: Compare the Impedance of your Audio Devices.

Before you start wiring your woofers to your mono amp, compare the impedance of your audio devices.

If the impedance doesn’t match, you might damage the entire audio system. To minimize this, you have to choose either a parallel or series connection depending on whether you want to increase the woofer’s impedance or decrease it.

Find the exact steps you should follow below. Remember to pay careful attention to step four, where we show you how to make parallel and series connections.

Step 2: Cut Your Wires.

Ensure the speaker wire is long enough to connect the first woofer to the amp. The second one needs to reach the first woofer from the first one. Once you have the right length of the speaker wire, cut the wires.

Step 3: Strip the Insulation Off.

Using a sharp knife or wire stripper, strip off the insulation of the speaker wire. Ensure ½ inch of bare wire on each lead is visible.

Step 4: Connect Your Wires to the Amplifier.

To connect the wires to the mono amp, do this:

  1. Pick the first wire and connect its end to the amp’s speaker output terminals.
  2. Tighten the screw and be sure your connection is secure.
  3. Connect the speaker’s positive lead to the positive terminal. Do the same with the negative terminal and the negative lead.

Step 5: Connect the Wires to the Woofers.

At this point, take care to avoid the risk of power mismatch.

If it is safe to reduce the impedance of your subwoofers by half, opt for a parallel connection. Here is what you should do to achieve this:

  1. Connect the remaining end of the first wire to the speaker’s terminals.
  2. Connect the free end of the second speaker wire to the same terminals.
  3. Ensure the terminals are tight and the cables are secure.
  4. Be sure the remaining end of the second wire is secured on the other woofer.
  5. Ensure your connections are safe and reliable.

If you want to double or increase your subwoofers’ impedance to protect your audio system and improve your experience, here are the steps you should follow:

  1. Connect the remaining end of the first speaker wire to the first woofer’s positive terminal.
  2. Connect the other wire to the second woofer’s negative terminal.
  3. Securely tighten the terminals.
  4. Connect another wire to the first woofer’s negative terminal.
  5. After that, connect the other end of the speaker wire to the subwoofer’s positive terminal.

Monoblock Amps with 2 Speaker Terminals

As the name suggests, a monoblock amp comes with a single-channel amp. Mono means one channel however some of these amps can have two speaker terminals. In most cases, these amps have two positive and two negative terminals.

Now please note that the positive terminals and connected inside the amp and the negative terminals are also connected inside the amp. So, the amp technically has a single channel. The second output makes your work of connecting multiple speakers or subwoofers to the amplifier easy.


Why do mono amps have 2 speaker outputs?

Most people want to connect at least two subwoofers to their monoblock amplifier. This is why monoblock amplifiers have two speaker outputs, so that two or more subwoofers may be connected to it. 

Overall, modern mono amps come with two speaker outs to make it easy for you to add two or more subwoofers to your audio system.

How do you use a mono amp with two speaker outputs?

To use a mono amp with two speaker outputs, simply connect one subwoofer to one terminal and the other subwoofer to the other terminal.

If you have more than two subwoofers, you can still connect the positive ends of those subs to either of the positive terminals and the name for the negative terminals. 

Can you hook up 2 speakers to a mono amp?

Yes, if you want to hook up two speakers in a mono amp, connect the amp’s negative terminal with the speaker’s negative terminal. After that, repeat the same process above as you perform a positive connection. You should do this for both speakers using the same speaker terminal if the amp only has one speaker terminal.

However, if the mono amp has two speaker terminals, then you can use each terminal for each speaker. 

Ensure the positive terminal wires are on one side and the negative terminal ones opposite.

If your two speakers have an impedance of at least 8 ohms, you connect them in parallel to reduce the overall load by half.  

You can connect the speakers in series if you establish a secure connection between the amp’s negative terminal and the first speaker’s out. Next, you connect the second speaker’s positive terminal with the amp’s positive terminal. Finally, connect the first speaker’s positive terminal with the second speaker’s negative terminal.

If the impedance is too low, you connect the speakers in series to double the impedance.

How many speakers can a monoblock amp run?

A monoblock amp can run as many speakers as you need as long as you ensure that the impedance does not go too low. Remember, a parallel connection will cut the impedance of the load by half. 

If you have two speakers, connect them in parallel. As we’ve said above, this is the best way to reduce the impedance by half. Before you opt for this connection option, ensure the total impedance of the speakers is double your targeted ohms rating.

If you want your mono amp to run more than two speakers, you can connect them in series. The impedance will be added in this case.

If you have two 16 ohms speakers and one 8-ohm speaker, you have 40 ohms in series. So, this is a great option if you have multiple speakers and the amp’s impedance is high enough.


With the information we’ve shared here, nothing stops you from reaping the most out of your mono amplifier. You have the skills needed to bring on the bass if you have got a mono amplifier. These amps are best suited for wiring two speakers, but you can add more if you use the simple tips above to match their impedance.

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Norvan Martin is the founder of BoomSpeaker.com. He is a professional Electronics Engineer and is passionate about home theater systems and AV electronics. BoomSpeaker was created as an online hub to share his knowledge and experiences as it relates to home theaters and home audio electronics. My email: [email protected]  Connect on Pinterest and Linkedin