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Arc Audio

Why Does My Sub Amp Have Two Sets of Terminals?

June 3, 2020 By 1sixty8

Sub Amp

If you’re shopping for a subwoofer amplifier for your car stereo system, you may have noticed that some have two sets of speaker terminals. In most cases, it’s reasonable to assume that an amp with two positive and two negative speaker connections would be a stereo amp. As you’ll soon see, this isn’t always the case.

Sub Amp Design Process

When an engineer is designing a car audio amplifier, there are lots of criteria to keep in mind. First and foremost is the amount of power the amp will need to produce. Power production has the most significant impact on the cost of an amp, since it determines the size of the heat sink and the power supply, and the number of power supply and output switching devices.

Sub Amp
The Helix P-One is a monoblock amplifier designed to produce 1,500 watts into a 1-ohm-load.

Next, the features to be included in the amp have to be taken into account. All subwoofer amps have a sensitivity control and most have an adjustable low-pass crossover. Some will add an infrasonic filter, a remote level control knob and perhaps a bass boost circuit. The cost of the parts (switches, potentiometers, op-amps, capacitors and resistors) adds to the cost of the amplifier, but also its flexibility and value.

Sub Amp
The ARC Audio X2 2500.1 is a monoblock amplifier that will deliver 2,500-watts into a 1-ohm load.

Use What You Have in Stock

It should come as no surprise that a mono sub amp needs only a single positive and negative speaker terminal. If the company designing the sub amp already has a four-position terminal block in its inventory, then they can use that to eliminate the cost of adding another component they need to stock.

Sub Amp
The impressively compact Sony XM-GS100 monoblock amp will produce up to 600 watts of power into a 2-ohm load.

Inside the amp, the two positive terminals are connected together, as are the two negative terminals. The extra connections are added for convenience to make wiring multiple subwoofers easier. If you have a vehicle like a Jeep Wrangler that is commonly upgraded with two separate subwoofer enclosures, being able to connect two sets of wires is easier. Is there a performance benefit? Not really. If you need to run two sets of speaker wires, the extra connections make that easier, but that’s about it.

Sub Amp
The Audison Voce AV uno mono amplifier is rated to produce 1,700 watts into a 1-ohm load. The symmetrical speaker connections match the output design of the two-channel AV due amplifier.

Upgrade Your Car Stereo with a Subwoofer

If you want to dramatically improve the performance of your car stereo system, drop by your local specialty mobile enhancement retailer today and ask about adding a subwoofer system. They’ll be happy to demonstrate different sub, amp and enclosure options for your vehicle.

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Filed Under: ARTICLES, Car Audio, Resource Library Tagged With: Amplifiers, Jeep, Monoblock Amplifiers, Remote Level Control, Speakers, Subwoofers, Wrangler

About 1sixty8

1sixty8 media is a content marketing, website development, and business solutions provider specializing in the mobile enhancement industry. The 1sixty8 media team includes many household names in the industry, from store owners and industry writers to award-winning installers and fabricators. To learn more about 1sixty8 media, visit www.1sixty8.com.

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