Why bi-amp your speakers?
How to get the best sound from compatible speakers
I started my Crutchfield career in 2007. I spent eight exciting years as a product advisor, fielding thousands of customer questions about A/V equipment while designing systems for homes, cars, and the occasional party bus. These days I specialize in home speakers and distributed audio systems, focusing on translating technical jargon into easy-to-understand language. My goal is to make shopping for speakers and amplifiers simple. After all, this stuff is supposed to be fun! Outside of work, I enjoy playing and teaching music. I'm always on the lookout for interesting left-handed guitars.
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I like getting the most out of my A/V gear. If there are features available that will improve my listening experience, I want to make sure I'm using them.
A few years ago I upgraded my 5.1-channel home theater receiver to a 7.1-channel model. This gave me a chance to engage one of its cooler features. I designated the two rear channels that weren’t being used with my five-speaker system to bi-amplify my front left and right floor-standing speakers. In other words, instead of just one channel of power going to each speaker, I now had two channels of power driving each speaker. The increase in performance was noticeable.
Why did bi-amping make a difference? Let's talk about the nuts and bolts of how it works first. Then we'll dive into what you need to bi-amp your speakers.
A bi-amp capable receiver uses two different pairs of amp channels for a single speaker. Here we show the connection points for the front right speaker in a home theater system.
How does bi-amping work?
On the speaker side
Bi-amping is a speaker connection method that uses two channels of amplification to power a single speaker. It's commonly used with the front left and right speakers of a home theater system.
Instead of a speaker's woofer and tweeter sections sharing one channel of power, they each get dedicated channels of amplification. This feature is found on select tower speakers and premium bookshelf speakers.
A bi-amp capable speaker has two sets of input terminals for connecting to two separate receiver channels.
On the amplifier side
Many of us have a 7.1-channel home theater receiver, but only use it to power a five-speaker surround sound system. Some 7.1-channel receivers let you reassign the sixth and seventh channel outputs for other applications.
You might use this extra pair of channels to power rear surround speakers, speakers in a second zone, or in this case, to bi-amp your front left and right speakers. Connecting these channels to a pair of bi-amp capable speakers increases the amount of power that each speaker gets.
Why is bi-amping effective?
Bi-amping provides more useable current to the speaker. Instead of a single channel’s worth of power divvied up between the woofer and tweeter sections, each speaker section gets a full channel’s worth of juice. Increasing the total amplifier power to each speaker provides more headroom and greater control, which can yield better sound.
Setting up a bi-amped system
Here's a short checklist of what you need to get started:
- A 7.1 (or greater) home theater receiver with an unused pair of assignable amp channels.
- A pair of speakers that each have two sets of input terminals.
- Four sets of speaker cables (two for each speaker).
Preparing your speakers
The first step to bi-amping your front speakers is removing the brass jumpers that link the top and bottom speaker terminals together.
Removing the jumpers lets you connect separate receiver channels to each set of terminals.
Dive into your receiver's settings
To bi-amp your speakers, you need to enable this feature in your receiver. This setting is usually located in the speaker setup section of your receiver's menu. Designate the unused assignable channels to bi-amp your front speakers.
On this Denon receiver, the surround back outputs are assignable as bi-amp channels. Each one pairs with a front channel to double power your speakers.
Connect each set of speaker terminals to the receiver
Once your receiver is set up to bi-amp, it's time to connect your speakers. One set of speaker cables connects to the front left and right outputs on your receiver. The second set connects to the assigned bi-amp channels.
Since each speaker cable is carrying a full-range signal it generally doesn't matter which channels plug into the top or bottom sets of speaker input terminals. But refer to your owner's manuals to see if there's a preferred connection point.
Make the right connection
There are a few different types of speaker cables that you can use to connect your bi-amped speakers. A popular choice is buying bulk wire, cutting it into four equal lengths for each speaker, and adding banana connectors on each end. This gives you a simple, secure way to connect your gear together. Pre-terminated speaker cables are also a good option for bi-amping.
Passive versus active bi-amping
The bi-amping method we describe in this article is sometimes called “passive” bi-amping. That means the speaker’s internal crossovers are still employed. Passive bi-amping doesn’t make any changes to the signal itself — only in the amount of available current being sent to each portion of the speaker.
This is different than “active” bi-amping, which removes the speaker’s crossovers from the signal path altogether. This method employs multiple amplifiers and external crossovers to achieve better sound. Active bi-amping can offer greater improvements in performance, but requires specialized gear to pull off.
How is bi-wiring different from bi-amping?
Bi-amping uses two channels of amplification to power a speaker that has two sets of input terminals. Bi-wiring uses just one channel of amplification to power the same type of speaker. Bi-wiring is useful when you have a single stereo amplifier or receiver as your power source.
A bi-wire cable has one pair of connections on the amplifier end, but two pairs of connections on the speaker end. This lets it take a full-range signal from the amp and send high and low frequencies down separate paths, which can improve treble and bass performance. Bi-wiring also removes the connective brass jumpers from the signal path, which are typically less conductive than bi-wire cables.
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