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Can I Hook Up 2 Subwoofers To My Receiver Need Help?

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Old 03-13-2006, 07:25 AM   #1
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Default Can I Hook Up 2 Subwoofers To My Receiver Need Help?

i need some help i was wondering if i could hook up 2 subwoofers to my kenwood 7.1 receiver i think the model # is 60rs.i have one powered subwoofer hooked up right now and my brother just gave me a powered subwoofer.right now i have my system set up for 6.1 if any one knows how i can hook up another subwoofer. please let me know how to hook it up. on the back of my receiver i do not see another input that says subwoofer. right now my subwoofer is pluged in to the receiver with a subwoofer cord i plug the other end of the into the sub but the cord i am using has 2 plugs on the end that goes to the sub i only needed to use 1 to my sub sub can i just plug the sub to the other 1.THANK YOU
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Old 03-13-2006, 08:12 AM   #2
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forgot to ask is there a adapter i can buy to plit my subwoofer input on my receiver ?i know this is not the best thing to do i am saving right now for a 12 inch klipsch sub but for the time being i want good bass.THANK YOU
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Old 03-13-2006, 12:10 PM   #3
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Should be no problem splitting them. But it does not always mean you get double the bass. Works best with the same subs, and in a good position if one sub is on top of the other.
But sometimes subs are used in different locations to even out room responses. But in most situations, one good sub properly located is all you need.
I would say experiment with it. Just remember, when good bass is present you should hear it, and it should not sound mushy or boomy.
Bass is something that is easliy overdone.
www.partsexperss.com is a good place to find sub cables at reasonable prices including splitters.
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Old 03-13-2006, 12:11 PM   #4
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You can do that by just getting a Y cable to feed each subwoofer. There could be some problems though.

In order to get an increase in sound output the two subwoofers sound waves need to reach your ears in phase. Sound waves cause a slight air pressure increase followed by a slight air pressure decrease alternating up and down at the frequency of the bass sound. With that in mind visuallize what happens if sub A is pushing the cone outward to increase the air pressure and sub is pulling the cone in to reduce the air pressure. The result will be a canceling of the sound with only the difference between the two volumes displaced reaching your ears. This will result in less bass than if you only used one subwoofer! This is easy enough fixed by making sure the two subwoofers are operating in phase. Since you may have different manufacturers of the two subs, you can't rely on one of them not reversing the phase due to their internal amplifier.

To phase the two simply operate them with a deep bass source material while facing each other. Using the phase swith (hopefully one of them has one) try both positions on one of the subwoofers. Use the setting that gives you the most bass.

Now the next issue is placement of the subwoofers. Ideally a single bass sound source is the best, but with two subwoofers obviously we have broke that rule. That is also true of large main speakers where the woofers are in the pair, so it is not hopeless. Bass sounds operate in a wavelength of about 37 feet down to say 10 foot or so. That means if you visualize a wave with a high point to the low point and then back to the high point, the physical distance between the two high points will be the wavelength. That's right is can be as long as 37 feet and as short as 11.3 feet for the bass range of 30-100Hz. What we would worry about is subwoofer placement that is different from one to the other. Bass will be degraded based on the difference of the distance to your ears at the half wavelength giving the most reduction. For example, assuming two subwoofers that output the exact same SPL, at 100Hz, the most SPL would be lost if one subwoofer was 5.65 feet further away or closer to your ears than the other subwoofer. So if you are trying to cover the entire room with the two, then placing them side by side would be the best bet.

What complicates this also is the reflected sound waves that bounce off of walls, floor and ceiling. Since these sound wave travel further than the direct waves they will arrive somewhat out of phase. That is why the trick of putting your sub in the chair where you normally sit and go to each place where you might want the subwoofer to be placed and compare the bass response is effictive for determining the best placement. Corners tend to act like a big horn and generally will reinforce the bass. Stacking two subs in a corner may work better than putting each sub in a separate corner.

Lastly, (well not really as there are a lot more issues with audio, but lastly as far as this post is concerned) there is the fact of SPL reduction as the sound travels away from the speaker. Simply stated the sound level will reduce the further you get away from the speaker. Taking advantage of this fact combined with the fact that subwoofer sound is truly non-directional, another tact to reinforce the bass with multiple subwoofers is to locate subwoofers near the seating areas with a subwoofer within 3-5 feet of each seating point. The nearest subwoofer will provide the bulk of the bass for that seating position. Often this will be behind couches and chairs. The best theater room I ever had was equipped with 12 subwoofers placed around the room. I built some of them into the walls, so they stayed with the house.

Another trick, which you didn't ask about, but will throw in for some completeness, is the use of tactile transducers on your seating areas. I find they work best with a very low crossover of less than 80Hz run at very low level through a dynamic expander. Basically I have mine set up to where it takes an explosion or other dynamic bass source, like thunder, in the soundtract to set them off. Music has a very minimum effect on them.
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Old 03-21-2006, 04:47 PM   #5
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The phase issues mentioned above will only be a problem in the upper bass frequencies. At 40 Hz, the wavelength is 28' 3". To be completely out of phase the difference in distance from your head to each speaker would need to be 14' 1.5". 9' 5" at 60 Hz. . . . Trial and error with speaker placement is required for every speaker in the system.

A Y-cable will work fine.
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Old 03-21-2006, 07:20 PM   #6
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Default Tactile transducers, yeah...

Here's a link to a site I found regarding Tactile Transducers. A kick to read, the author has a quiet sense of humor and I have to admit after reading it, I'm thinking what if I...
The site:
http://www.baudline.com/erik/bass/tactile_faq.html

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Old 03-22-2006, 12:29 AM   #7
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Tactile transducers are fun. And they range from affordable to whatever you wanna move. But they are a subject best left in another thread.
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