Wiring 2 Subs To A Mono Amp
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Wiring a subwoofer to a mono amp is easy and can be done either in series or parallel. However, you must take caution to match the impedance ratings of the subwoofer and amplifier. This article shares the details on connecting two subwoofers to a mono amp. 

You can wire 2 subs to a mono amp in parallel or by way of bridging. In some cases, you can wire 2 subs to a mono amp if the mono amp has 2 terminals. Below are two illustrations showing how you can do this:

1. Parallel Connection:

conect monoblock ampifier witgh 2 terminals to 2 subwoofers

Connecting 2 subwoofers to a mono amp parallel connection

2. Series Bridged Connection

Wiring 2 Subs To A Mono Amp Bridged

Wiring 2 Subs To A Mono Amp (Step By Step)

Mono or monoblock amplifiers perform perfectly well when it comes to bass production. This is why they are well-suited to wiring to two subwoofers. Read our guide on monoblock amplifiers or mono amps vs 2 channel amps to learn more.

It is, therefore, easier to wire two subwoofers to a mono amplifier as long as you have cut your wires appropriately, understand the use of the simple tools required, and follow the basic instructions properly. 

However, it is important to note that the wiring depends on the impedance specs of the subwoofers and the state range of load of the mono amp. 

You can still comfortably use an amplifier that is much larger than the ratings of your subwoofers in terms of power demands. However, do not operate them in noticeable distortion as that can easily cause destruction to the subs. 

You can wire two subwoofers in series or parallel. When wired in series, the load is twice that of a single sub impedance, while the parallel connection gives it half the load of a single subwoofer.

Note that if you are using speakers, you can check out our guide on how to wire 2 speakers to a mono amp having 2 terminals.

Parallel Connection 

As we mentioned, the parallel connection of subwoofers to the amplifier delivers half the total impedance. For instance, if the subwoofers have individual impedance ratings of 8 ohms, the resulting impedance in a parallel connection is 4 ohms. 

Follow the step-by-step process below to wire two subwoofers to the mono amp in parallel. 

Step 1: Cut The Wires

Cut two lengths of wire. Ensure the cables are long enough to cover the distance between the amplifier and the subwoofers. The length of the first and the second wires will depend on the distance of the first and the second subwoofers from the amplifier. 

Step 2: Strip The Wires 

Strip off the insulation from the ends of the wires to expose about ½ inch of bare wire on each lead to make the connection easier. You can use a sharp knife or wire stripper to strip the cables easily without destroying them. 

Step 3: Connect The Speaker Wires To The Amp

Now connect one end of the first wire to the speaker output terminals of the amp. Loosen the screw and slip the bare wire underneath to complete the connection. Tighten the screw and make sure the connection is secure. 

You should connect the positive lead of the speaker wire to the positive terminal and the negative lead to the negative terminal. 

Step 4: Connect The Speaker Wire To The Subwoofer

Now connect the other end of the first speaker wire to the subwoofer terminal and the second wire to the same set of terminals. Tighten the terminals and ensure both wires are securely attached. 

Wire the other end of the second piece of speaker wire to the terminals of the second subwoofer. Tighten the screws and ensure the connection is secure. 

Series Connection 

This kind of connection doubles the total impedance of individual subwoofers in correspondence to the number of subs in that connection. If you wire two subwoofers of 8 ohms each, for instance, the total impedance is 16 ohms. Follow the steps below to complete the link. 

Step 1: Cut The Wires

Cut two lengths of wire. Ensure the cables are long enough to cover the distance between the amplifier and the subwoofers. The length of the first and the second wires will depend on the distance of the first and the second subwoofers from the amplifier. 

Step 2: Strip The Wires 

Strip off the insulation from the ends of the wires to expose about ½ inch of bare wire on each lead to make the connection easier. You can use a sharp knife or wire stripper to strip the wires easily without destroying them. 

Step 3: Connect The Speaker Wires To The Amp

Now connect one end of the first wire to the speaker output terminals of the amp. Tighten the screw and make sure the connection is secure. 

The positive lead of the speaker wire should be connected to the positive terminal and the negative lead to the negative terminal. 

Step 4: Connect The Speaker Wire To The Subwoofer

Now connect the other end of the first speaker wire to the positive terminal of the first subwoofer and the second wire to the negative terminal of the second subwoofer. Tighten the terminals and ensure both wires are securely attached. 

Take another wire and connect one end to the positive terminal of the first subwoofer. Connect the other end of the wire to the positive terminal of the subwoofer. Tighten the screws and ensure the connection is secure. 

FAQs

What does a monoblock amp do?

Monoblock amps boost a single input signal through a single output channel.

Can you hook up 2 subs to a mono amp?

Monoblock amplifiers have 1 channel only and cannot be bridged. It is, however, possible to wire multiple subwoofers on the 2 outputs. 

Do two subwoofers make a difference? 

Dual subwoofers provide a greater dynamic range, reduced output compression, lower distortion, and less potential for overdrive artifacts for cleaner and more accurate bass. 

Wiring 2 SVC 4 Ohm Subs To Mono Amp

Wiring two single voice coil 4 ohm subwoofers to a mono amp is pretty simple. However, parallel connection is preferred as it delivers the greatest bass output. 

Connect a speaker wire to the two positive terminals of the two subwoofers and wire it to the positive terminal of the amp. Repeat the same procedure with the negative terminal connections. 

This way, the 4 ohm subwoofers yield a total impedance of 2 ohms. On the other hand, the two SVC 4 ohm subs can be wired to a mono amp in series. In this case, they yield a total impedance of 16 ohms, as described above. 

Wiring 2 Dual 2 Ohm Subs To 1 Ohm 

Wiring two single voice coil 2 ohm subwoofers to 1 ohm impedance can be achieved through parallel connection. 

Connect a speaker wire to the two positive terminals of the two subwoofers and wire it to the positive terminal of the amp. Repeat the same procedure with the negative terminal connections. This way, the 2 ohm subwoofers yield a total impedance of 1 ohm.

Monoblock Amp Wiring Diagram 

For best monoblock amp wiring, see the diagram below.

How To Wire 2 Dual Ohm Subs Down To 2 Ohms 

1.      2 dual 2 ohms to 2 ohms

Step 1: Parallel the two subwoofers by wiring the positive of the first sub to the negative of the first sub and repeating the same with the second subwoofer.  

Step 2: Now connect the two subs in series by wiring a positive jumper to the positive terminal of the first sub and the positive terminal of the second subwoofer. Then connect a negative jumper from the first subwoofer’s negative terminal to the second subwoofer’s negative terminal. 

The two subwoofers are now reduced to a total impedance of 2 ohms. This kind of connection begins by raising the impedance of the subwoofers to 4 ohms before finally reducing them to 2 ohms. 

2.      2 dual 4 ohms to 2 ohms 

This wiring can be achieved with two dual ohm subwoofers of 4 ohms each. Follow the steps below: 

Step 1: Wire the first subwoofer’s positive terminal to the first subwoofer’s negative terminal. Repeat the same procedure with the second subwoofer. 

Step 2: Now wire the remaining negative terminal of the first subwoofer to the remaining negative terminal of the second subwoofer. 

Step 3: Wire the remaining positive terminal on the first subwoofer to the free positive terminal of the second subwoofer. 

Step 4: Connect the positive jumper to the positive terminal of the amp and the negative jumper wire to the negative terminal of the amp.

2 Amps 2 Subs Wiring Diagram

Here are some of the 2 Amps 2 subwoofers wiring diagrams you can use to help you do a DIY wiring in a short time. 

How To Wire A Single 4 Ohm Sub To 2 Ohm

You may not successfully wire a single 4 ohm sub to 2 ohms unless you have two or more. To wire two single 4 ohm subwoofers to a 2 ohm final impedance, follow the steps below: 

Step 1: Connect a positive jumper wire to the positive terminal of the first subwoofer. 

Step 2: Connect the other end of the wire to the positive terminal of the second subwoofer. 

Step 3: Connect another wire to the positive and negative terminal of the first or second subs. The two subwoofers have been joined to a total impedance of 2 ohms. 

How To Bridge A 4 Channel Amp To 2 Subs 

Step 1: Begin by stripping the wire to remove about ½ inch of insulation to expose the ends of the wire.

Step 2: Unscrew the screw on terminal 1 of channel 1 of the amp and fix the positive wire to it. 

Step 3: Fix the black wire to the fourth terminal on the second channel’s negative option to complete the first subwoofer’s connection. 

Step 4: Repeat the first and second steps to wire the second sub through terminal five and terminal eight of the third and fourth channels. Ensure the connection is secure.