Home theater bypass or HT bypass is a line-level feature on high-end preamps or integrated amps that allow users to combine a surround sound with a 2-channel stereo set up. The receiver’s volume/gain controls are bypassed and the power amp is used as a stereo amp for the 2-channel setup.
Simply put, a home theater bypass allows you to use your home theater as both a movie and a music room. When listening to music, you do not have to worry about the audio compression on your integrated amp.
This is a very helpful feature if you are a music nut that also enjoys movies. But here is how it actually works.
Contents and Quick Navigation
How home theater bypass works
If your integrated amp has the HT bypass feature you can use your front left and right speakers for stereo music and still use them for your surround setup, be it a 5.1 or a 7.1 surround sound.
This is handy if you listen to music from a CD player, turntable, and other uncompressed sources without having to worry about encoding and decoding on the integrated amp (audio processing).
Surround audio processing is great for watching movies but the same cannot be said for music.
Also, when you use the bypass feature, you do not have to tweak the volume level for the front left and right speakers every time you switch between listening to music and watching movies.
The volume can be set by using your pre/pro controls and prevent you from finding yourself in situations where the volume is too high as you turn on your home theater surround.
It also saves you from having to reset your gain or EQ when switching between stereo and surround sound.
Not all integrated amps will have this feature though. To know if your integrated amplifier has the bypass feature you can simply check the manual or check online specs. You can also check the ports on the integrated for the RCA “Home Theater Bypass” input ports that may also be labeled as “Direct” “TAPE” or “Processor input” on a preamp.
How to use the HT bypass feature
To use the bypass feature on your integrated amplifier or preamp, you will need an RCA cable.
This allows you to bypass the gain control on the preamp which lets you use the integrated power amp or separate power amp purely as a stereo amplifier.
If you do this, you can adjust the volume normally on your AV receiver (processor) when you are watching movies with your surround speakers. The second preamp will not process audio for the stereo channels.
When listening to music from your stereo sources, you can simply adjust the volume using the volume control on the stereo source or from your stereo power amp.
What does this mean?
If you use your receiver as your sole processor for the surround sound and stereo, you will need an extra integrated amp or separate preamp and a power amp.
Run the center and surround speakers through your receiver and the front left and right through the respective preouts on the receiver. Connect the preout cables to the bypass inputs on the preamp or integrated amp. The stereo signal then goes to the power amp without being processed which then powers the front left and right speakers.
Volume control on the second preamp stage will be bypassed which means you cannot use it to control the volume for the stereo speakers. When in surround mode, your receiver controls the volume for all the speakers, the surround speakers, the center channel speaker, and the front left and right speakers.
This will also mean that you will not have to spend more on better high-fidelity sound. But you will conveniently switch over to and from a 2-channel set up in your surround system with one button press. Essentially, you will not have to change your wire or use an external switching every time you want to change between 2-channel and surround.
However, if you are not too keen on this, you can purely use your receiver for all the channels and process all the audio using the receiver’s listening modes.
Audio nuts understand that a receiver alone cannot put out high-quality uncompressed sound when listening to music and this where the extra bypass components come in.
What if my preamp/integrated amp does not have an HT bypass input? (alternative)
In this case, you can plug in the front left and right speakers to the stereo integrated amp or preamp and all the other speakers to the relevant terminals on the AV receiver (center, surround, height).
You will also need an analog interconnect to connect the front left and right preouts on the receiver to the corresponding inputs on the integrated amp/preamp.
Use your receiver to calibrate the speakers. Some receivers may need you to assign the preouts (amp assign) which lets the receiver know that you are using the preouts. The receiver’s user manual should have instructions on what to do in case you are using the preouts.
You can now test all your speakers to make sure that the sound is coming out of all the speakers as it should. This will ensure that your volume is balanced when you are in surround mode.
Then connect all 2-channel music sources to the integrated amp or preamp and the other movie, video, and gaming sources to the receiver.
If you are connecting to a preamp you will also need a power amp for the frontstage speakers (front left and right)
The pros and cons of this alternative
- Pure and uncompressed high-fidelity stereo sound plus a surround set up when you need it.
- Reduced strain on your receiver and hence more power for the speakers.
- In some cases, you can have sonic inconsistencies from the speakers running through the AVR and the ones running through the separate amp. (may also happen in a bypass set up)
- Expensive. (a bypass set up is also expensive)
- You may sometimes need to switch up your sources manually something that you would not need to do for a bypass system.
Cost is one of the biggest drawbacks to both of these set-ups but with a bypass set up, you only get to switch things up with one button press.
My final thoughts
If you are not an audiophile or are not too keen on high fidelity stereo sound, a bypass preamp or integrated amp will be of no use to you.
But for a true audiophile that does not have the luxury of having a separate music and movie room, this is a great option. Although it is an expensive option, you get to enjoy high-quality uncompressed music.
However, for this to work effectively, the integrated amp or preamp needs to have a true bypass circuit.
Also, if a bypass integrated amp or preamp is a very expensive option, you can invest in a switch or physically switch the surround and 2-channel set up. However, if you take this route, you will need to turn the volume down every time you are done watching a movie.