You may want to perform a final refinement, particularly when applying manual parametric EQ, by using software measurement tools to verify what's happening at the listening location.
Bass peaks are easiest to equalize out, but dips can sometimes be audio black holes that are impossible to fix with any amount of frequency boost. Two Subs Are Better Than One A key takeaway from the book Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms referenced above is that at least two subs are needed to optimize bass response for more than one listening seat.
Also, the point of using multiple subs is not to produce greater bass output, but to create more uniform bass response in the room. The measurements described in Toole's book are applicable mainly to enclosed, acoustically symmetrical, rectangular rooms with flat ceilings. For the testing carried out at Harman, the main front speakers were positioned near the short wall and fired down the room's long dimension the opposite arrangement—front speakers on the long wall—was found to be inferior , with the seating area located roughly in the center of the room.
The optimum location for two subwoofers in such a room and seating arrangement was found to be on directly opposite walls either side-to-side or front-and-back, at the mid-wall positions in both arrangements. In four-sub installations, both opposite-wall locations could be used, though the research also suggests that corner placement might work better in some rooms—assuming four corners are available. Floyd E. Toole's book Sound Reproduction: The Acoustics and Psychoacosutics of Loudspeakers and Rooms is a must-have reference for anyone interested in the technical aspects of audio reproduction.
If you do use two or more subwoofers, it's not recommended that you set them up as a stereo pair—a popular audiophile choice. As noted above, bass, particularly below the typical subwoofer crossover frequency of Hz, is non-directional. Yes, it's true you'll often hear an instrument such as a bass drum or double bass appear to come from a specific location. But what you're actually hearing are the instrument's overtones, most of them well above the sub's crossover point.
These overtones blend together with the non-directional low frequencies to provide the illusion of stereo bass. Furthermore, setting dual subs up as a stereo pair eliminates their ability to improve overall bass uniformity in the room.
For that to work properly, each of the two or more subs must be set up to reproduce the same bass information. Conclusion Don't be surprised if perfection is elusive when attempting your own set of measurements to optimize subwoofer positioning. I certainly didn't achieve it, though the bass in my room ended up being more uniform from seat to seat than before, both with and without Audyssey room correction.
And while Audyssey worked well for music listening, I sometimes preferred the added warmth that was present without it for movies. Further experimentation using Audyssey's MultEQ Editor app, which can be used to adjust the target curve, would help here, but MultEQ Editor isn't available for all components that feature Audyssey room correction.
Reading Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms , the book's charts make it clear that the complexity of small room acoustics is only slightly less than infinite and filled with variables that can't be fully accounted for in any practical sense. But one thing about bass is certain: In rooms where there's more than one listener, two or four!
I run three 10" sealed subs used two run two 12" in my family room set up 5. Similar to your room, it's open to the kitchen and then formal living room.
It's 18'x 17' with 12' cathedral ceiling. The two 12" subs ported had great low bass extension, but due to their large size due to being port design the ideal placement was nixed by the wife. For my space, three 10" sealed subs at 60hz cross over was the perfect solution I have large three way full range towers. You can do this in two different ways: auto setup if your receiver has this feature or manual calibration.
If you prefer to not manually calibrate and instead wish to rely on your receiver's auto calibration process, follow the manufacturer's instructions on how to perform this task. Most auto setup programs are pretty accurate at setting distance and levels for each channel. But, we usually recommend going into the setup menus afterwards and adjusting crossover points to 80Hz and all speakers that were set to "Large" back to "Small" to ensure the best possible integration in your system.
Make sure you have a tape measure handy to measure the distance of each speaker relative to the primary listening position. Do this before level matching as the output levels when playing the main channels in conjunction with the sub s can vary if you don't have the proper distances set since the sub s and main speakers may not properly sum at the crossover point if they aren't properly time aligned.
It's important to level match your sub relative to rest of the speakers in your system. The proper way to level match your sub is to use the internal pink noise generator of your processor aka. Position the SPL meter with a tripod or other device to ensure the microphone is in the upright position firing at the ceiling about seated ear level at the primary listening position. Using the internal test tones, calibrate each speaker to roughly the same level use 75dB as a reference.
It's ok to boost the sub level a couple of dB if you want a bit more bass impact. So if you set all of your speakers to 75dB, don't sweat setting your sub to say dB. It's a good idea to measure the SPL at least two locations and calibrate your main channels with respect to your sub to within few dB of each other to ensure they are more closely level matched for your listening area.
In fact THX suggests that you shouldn't rush your measurements. THX recommends each measurement take at least 20 seconds for example.
If the level goes down in the deg position, flip it back to 0 degrees. You can also confirm via listening tests which setting sounds better by having your friend flip the switch back and forth while you listen to bass heavy content.
After you have everything setup and configured, it's time to listen. Play some bass heavy music content you are familiar with. Does the system sound well balanced? If you can't hear a good seamless blend between the subwoofer and speakers, you need to experiment some more.
Achieving good bass can make or break the overall fidelity of your home theater. It's important to invest the time both in setup and critical listening evaluation to ensure you get the most out of your system by getting the bass right. We hope this basic guide helps you in achieving sonic nirvana both heard and felt.
If you run into a snag during setup, peruse the Audioholics forums and post questions for our staff and or other forum readers to help you. Don't be afraid to ask for help. Gene manages this organization, establishes relations with manufacturers and keeps Audioholics a well oiled machine.
His goal is to educate about home theater and develop more standards in the industry to eliminate consumer confusion clouded by industry snake oil. Now, this is why we came all the way. Because some subwoofers do not have that output jack also called Low-Frequency Effects port. For subwoofers, you may find spring clips that look like those of a regular loudspeaker.
Either those or stereo RCA connectors i. R and L stereo connectors. If you are using a single RCA, just run the cable from any of the RCA ports on your sub into the subwoofer port in your amplifier. If you are using a Y connector then connect both ports to your subwoofer output.
If you have a receiver with double ports for SUB OUT, just like the sub, then use two single RCA cables to run the left port into the left port and the right port into the right port.
There are two ways to run this connection. This depends on if the spring clips on the sub are single or double. In that case, connect the speaker to the subwoofer in one clip and run the sub into the receiver.
If the clip set is single, then you have to connect both the speaker and the amp in the same clip. With this process, you can set the sound on your speakers to suit the need of your room. Without an automatic calibration system, you can manually set up your speakers the way it satisfies you.
Even auto calibrations can be adjusted manually. Below are a few tips that you can employ to manually set up your sound. The best way to run this arrangement is to place them from the smallest to the largest. The setting of the speakers should be based on the output power of the speakers. Use a crossover setting of 80 Hz. Large patterns with main speakers are usually not friendly.
On the Settings menu of your receiver, identify where the speaker setup is located. The setting will indicate sizes that you can choose for the speakers on the front left and right. This setting indicates bass management and not the size your speaker has physically. In some receivers, the bass out feature will let you set up your audio for two channels. Here the crossover settings do not feed off each other amongst other benefits.
With this, you can set up your subwoofer to accept audio from two channels if that works for you. Without the subwoofer output in your subwoofer, connect with the preamp output.
This jack is usually on the connection board behind the amplifier or receiver. If the RCA jack of your subwoofer has only one receiving port, then a Y connector will do a good job of connecting the two devices.
You already know that you can use speaker wires to run the receiver to the subwoofer so that the sub acts like a speaker. Use the front left and right speaker terminals on your receiver for this connection.
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