Find out how to Join Two Amps Collectively: A Fast Step-By-Step Information

There are lots of causes you would possibly wish to join two amplifiers to your stereo or house theater system.

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Possibly you will have an outdated amplifier mendacity round and wish to make use of it, or you will have a separate subwoofer which you wish to energy with its personal amplifier.

You would possibly wish to improve your house theater system with outboard amplifiers, otherwise you simply need your house stereo system to play louder and sound higher.

This how-to information will run you thru a number of completely different eventualities, explaining in every case precisely hook two (or extra) amplifiers up.

We may also aid you keep away from some huge issues by describing methods NOT to attach amplifiers collectively – methods which is able to nearly actually injury one or each amplifiers, blow your audio system and even injury different parts in your audio system.

Lastly, we are going to go over some troubleshooting strategies – in case you will have completed the whole lot proper and it nonetheless doesn’t work.

If you’re a DJ, an MC otherwise you’re doing sound for a band, a membership, or different house, you would possibly wish to join two amplifiers to your mixing board – perhaps to energy further audio system and fill an area extra successfully, to run monitor audio system or for different causes.

In that case, please seek the advice of our tutorial “Find out how to Join Two Amplifiers to a Mixer” for detailed directions, useful hints, troubleshooting, and different info.

When connecting two amplifiers to your house stereo or house theater system, you will need to do not forget that there are secure, efficient methods to do that, and there are additionally strategies which might be harmful and can injury your audio gear.

If you wish to run two or extra amplifiers in your system, there are at the very least three secure methods to do that, specifically utilizing:

  • An Amplifier Change
  • A Encompass Sound Processor
  • An Energetic Crossover

The primary applies if you wish to join a number of amplifiers to a single speaker or pair of audio system, and use just one amp at a time.

The second and third apply whenever you wish to join two or extra amplifiers to your system and use them on the identical time, every amp powering a special set of audio system, with one in all them often used for a subwoofer.

Let’s go over every of those intimately:

Connecting Two Amplifiers to One Speaker Utilizing an Amplifier Change

An amplifier change is a straightforward field that allows you to change from one amplifier to a different.

This answer doesn’t allow you to play each amps on the identical time and doesn’t improve energy or make the system louder. It merely permits you to use completely different amplifiers together with your audio system at completely different instances.

Causes you might wish to do that:

  • To check the sound of two completely different amplifiers
  • To run a house theater encompass sound amplifier into all your audio system for films and a stereo amp into simply the entrance two audio system for music
  • Since you choose the sound of various amplifiers at completely different instances or with completely different music

We’ll use an excellent fundamental and reasonably priced amplifier and speaker switching unit for this tutorial, the Specialty-AV SP-22V.

No matter change you employ, be sure that it’s a “break earlier than make” change, that means that it fully disconnects one amplifier earlier than connecting the opposite. Some other sort of change is prone to trigger injury to your gear.

Wiring an amplifier change like that is very easy, however let’s go over the fundamentals step-by-step.

You possibly can see on the again panel that there are connectors for 2 amplifiers (marked “enter”) and connectors for 2 pairs of audio system (marked “output”). Connecting two amplifiers takes solely three fundamental steps:

  1. Run speaker wire from the again of 1 amplifier into enter A on the again of the change field, ensuring to attach proper to proper and left to left, and optimistic to optimistic and unfavorable to unfavorable.
  2. Run speaker wire in precisely the identical manner from the again of the second amplifier into enter B.
  3. Run speaker wire from the #1 output connectors on the again of the change field to your pair of audio system, once more ensuring to attach proper to proper and left to left, and optimistic to optimistic and unfavorable to unfavorable.

Now you need to use the entrance panel controls to simply and safely change from one amplifier to a different. In case you have additionally wired within the second pair of loudspeakers (following step 3, however this time for the #2 output connectors) you may as well change between audio system.

IMPORTANT to Think about when Connecting Two Amplifiers to One Speaker!

Many individuals wish to use a second amplifier to make their sound system louder, and suppose that they will successfully improve, even double, their energy by operating two amplifiers into the audio system on the identical time.

It’s attainable to “bridge” amplifiers on this manner in a automobile stereo system, however for house or skilled audio, it doesn’t work, and may by no means be completed! It can injury your amplifiers, audio system, and probably different parts in your sound system.

Particularly, it is best to NEVER:

  • Run speaker wire from two amplifiers to 1 set of audio system on the identical time with out utilizing the proper amplifier switching field – even in case you are solely utilizing one amp at a time.
  • Attempt to use a speaker switching field backwards.
  • Try any kind of particular wiring to run amplifiers bridged, in parallel or in sequence.

Actually, the one secure and efficient methods to make use of two amplifiers on the identical time on a pair of audio system are coated in our subsequent sections on join two amplifiers to your house theater or stereo system.

Connecting Two Amplifiers to a Dwelling Theater System Utilizing a Encompass Sound Processor

The encompass sound processor is likely one of the most necessary components of any house theater/audio-visual system.

It splits the audio sign (a film’s soundtrack or music) into varied channels.

There are often at the very least six channels – two for the entrance left and proper audio system, two for the rear left and proper (encompass) audio system, one for the entrance middle channel (dialogue) speaker, and one for the subwoofer, which performs deep bass.

Most audio/visible techniques have an all-in-one receiver, which already has the encompass sound processor, in addition to all of the amplifiers for the audio system and the subwoofer, constructed proper in – not in separate containers.

The output connectors for the audio system and subwoofer are on the again panel of the receiver and are clearly marked.

It’s then a easy matter of operating speaker cable from the speaker outputs to the proper audio system and from the subwoofer outputs to the subwoofer.

Some increased finish house theater techniques may also provide separate output connectors from the encompass processor, so to bypass the inner amplifiers and as a substitute join separate amplifiers – which can provide extra energy and higher sound high quality.

If that is so, wiring turns into a little bit bit extra sophisticated, however it’s nonetheless fairly simple in case you simply take it step-by-step.

The house theater receiver can have a clearly marked part on its again panel the place the “pre-out” outputs from the encompass processor are.

These are line stage outputs, which have a a lot decrease energy stage than the speaker outputs, and so they’re designed to be linked to amplifiers, which in flip are linked to the assorted audio system.

The steps under will precisely clarify join a number of amplifiers to the AV system.

For our instance we are going to reference the Yamaha RX-A3080 Dwelling Theater Receiver, an outstanding high-end Audio Video receiver with numerous energy, nice sound, and the entire flexibility and controls anyone might ever want, however the identical directions will work for any AV receiver or preamplifier.


Picture courtesy of Yamaha Corp.
  1. Find the part on the AV receiver’s again panel that has the “PRE OUT” connectors.
  2. Run RCA connector cables from the outputs for the entrance audio system to the enter jacks on the entrance speaker’s amplifier, ensuring to attach the optimistic (often pink) jack to optimistic and unfavorable to unfavorable.
  3. Do the identical for the encompass audio system, the middle channel (dialogue) audio system and the subwoofer(s).
  4. Now run speaker wires from every amplifier to its corresponding audio system, ensuring, when acceptable, to attach the left speaker to the amp’s left speaker output and the precise speaker to the precise speaker output.
  5. Seek the advice of your receiver’s homeowners handbook for info on regulate particular person channel ranges to acquire the very best steadiness between the audio system.

If you’re unsure do all of this, have questions or simply want some assist, the audio/visible seller the place you bought your gear ought to be capable of provide all of the help you want.

Connecting Two Amplifiers to a Dwelling Stereo System Utilizing an Energetic Crossover

An energetic crossover is a tool that can separate the music sign’s excessive frequencies from the low frequencies, sending the excessive frequencies to 1 amplifier which powers the high-frequency speaker drivers (just like the tweeter and midrange) and the low frequencies to a second amp to energy the woofer or subwoofer.

Crossovers are often already constructed into audio system, however an energetic crossover is available in its personal field and often sits between the stereo preamplifier and the amplifiers.

If you’d like extra particulars about speaker crossover, now we have a full article devoted to that.

On this case, you’ll in all probability have one amplifier for the tweeter and midrange audio system and one amplifier for the woofer/subwoofer.

Connecting a number of amps to your hi-fi system like this could provide many benefits – extra quantity and extra musical vitality, higher readability and sound high quality, deeper bass, and fewer distortion and coloration all throughout the musical spectrum – from the best notes to the bottom.

When utilizing an energetic crossover in a high-end audiophile stereo system, there are lots of completely different issues:

  • You must get a really prime quality crossover which matches effectively with the system, the audio system and your personal tastes.
  • The amplifiers themselves also needs to be prime quality, and every amplifier needs to be optimum for the speaker it’s driving, by way of frequency vary, energy output, impedance and different variables.
  • The audio system ought to have separate inputs for top and low frequencies, not only one pair of speaker wire connectors, or there needs to be a separate subwoofer in its personal field and with its personal connectors.

At this stage of kit and listening, most individuals take into account it clever, and even crucial, to hunt the recommendation of knowledgeable audiophile seller to pick out and arrange their amplifiers, crossover, and audio system – in addition to the remainder of their high-end audio gear.

Troubleshooting – I’ve adopted the directions, nevertheless it doesn’t work; now what?

What if in case you have adopted our directions precisely and it nonetheless isn’t working?

Even the only course of can go unsuitable, and discovering the rationale can typically take longer than the method itself.

To keep away from this, let’s run via some fundamental issues you would possibly encounter.

1. Make Certain All the Gear is Turned On

Be sure the entire gear is turned on, and that the quantity controls are turned up at the very least a little bit.

This consists of not simply the amplifiers, however the receiver or preamplifier they’re plugged into and any supply gear you might be utilizing – CD, DVD or MP3 participant, web supply, file participant, or the rest.

Don’t simply examine the ability change, however be sure that all of the gear is plugged in and energy or dial lights are lit up.


When turning gear on and off – particularly energy amplifiers – you will need to flip them on and off within the right order.

You must all the time flip your receiver or preamplifier on first, and solely then flip your energy amplifier on.

When powering down, accomplish that within the reverse order: all the time flip your energy amplifier off first, and solely then flip the preamplifier or receiver off.

This will help you keep away from sudden loud pops and noise and even attainable injury to your gear.

2. Make Certain You Have Appropriate Supply Chosen

Additionally just be sure you have the proper supply chosen.

For instance, in case you are taking part in a DVD, make it possible for the receiver’s enter selector is ready to DVD.

This may grow to be complicated with extra superior AV receivers, which can assist you to plug in lots of, many various sources – they might even have inputs for 3 or 4 completely different DVD gamers!

If unsure, examine which connector on the again panel the DVD participant (on this instance) is linked to – it needs to be clearly labeled DVD 1, DVD 2, and so on, and the receiver’s selector change ought to say the identical factor.

3. Test All the Cables

Test the entire cables – between the amplifiers and the audio system, between the amplifiers and the stereo or house theater system, between the supply gear and the stereo or house theater system.

Be sure they’re in the precise place and are actually securely linked.

4. Test the Fuses and Circuit Breakers

Typically a safety circuit will journey, reducing off energy or audio sign, and also you would possibly simply want to show the gear off for a second to let it reset.

If the safety circuitry screens extreme warmth, you will have to show the ability off after which anticipate a couple of minutes earlier than it resets.

5. Experiment

If attainable, join every separate piece to different gear to see if it really works, and exchange cables with spares if in case you have them.

Then you definitely would possibly be capable of work out which piece is inflicting the issue.


You must NEVER open up any digital gear to attempt to diagnose or repair it or for every other cause.

Doing so will void your guarantee, would possibly injury the gear and might trigger critical electrical shock and damage.

If you happen to can’t work out the issue, convey it to a professional – ideally manufacturing facility licensed – technician.

Watch The Movies On Find out how to Join Two Amps Collectively

Video on Find out how to Join Two Amplifiers to One Speaker Utilizing an Amplifier Change

Video on Find out how to Join Two Amplifiers to a Dwelling Theater System Utilizing a Encompass Sound Processor

Video on Find out how to Join Two Amplifiers to a Dwelling Stereo System Utilizing an Energetic Crossover

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