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How to place 2 subs in a 7.2 system

post #1 of 21
Thread Starter 
This is my first post and I am thankful your forum exists. I am confident you guys/gals can answer my question.

I have 2 Polk Audio PSW505 12-Inch Powered Subwoofers. I have an Onkyo TX-NR808 7.2 receiver. I have a 17x20 room for the home theater. The screen will be on the 17 wide wall. I have the option of placing both subs at the back of the room and building them into the wall so they kinda blow your doors off from behind...or I can put them in opposite corners. Or anywhere you all tell me is best.

Thanks in advance for the help!
post #2 of 21
Well...

"Blowing you away from behind" is not what is going to happen. But sub placement has as much to do with the other 7 speakers, as it will with these two subs.

What crossover are you going to use?
Yes they can sit in opposite corners. It won't matter(if ran at 80hz or under) if they are behind, next, in front or even in the next room.
post #3 of 21
The best thing you can do is trying placing one in different locations throughout your room to see where you get the best frequency response. Every room will be different so it's trial and error. Usually corner loading it will give good results but finding a good spot for the second sub will take some experimenting to find the sweet spot.

If you find one works great in the front corner you can also stack them to gain output but you might prefer to spread them out and get better FR.

You can put a sub in your seat and then crawl throughout the room and listen for the sweet spot and then just put a sub there.

Hope that helps.
post #4 of 21
Quote:
Originally Posted by Seminole94 View Post

This is my first post and I am thankful your forum exists. I am confident you guys/gals can answer my question.

I have 2 Polk Audio PSW505 12-Inch Powered Subwoofers. I have an Onkyo TX-NR808 7.2 receiver. I have a 17x20 room for the home theater. The screen will be on the 17 wide wall. I have the option of placing both subs at the back of the room and building them into the wall so they kinda blow your doors off from behind...or I can put them in opposite corners. Or anywhere you all tell me is best.

Thanks in advance for the help!

http://www.audioholics.com/tweaks/ge...nnection-guide

I would not build them into the walls. I would consider figure 4 from above and you can try putting them in opposite corners in the front and back of the room as well. Try experimenting to determine what works best in your room.
post #5 of 21
Quote:
Originally Posted by schan1269 View Post

Well... "Blowing you away from behind" is not what is going to happen.

Especially with PSW505's
post #6 of 21
Thread Starter 
[QUOTE

I would not build them into the walls. I would consider figure 4 from above and you can try putting them in opposite corners in the front and back of the room as well. Try experimenting to determine what works best in your room.[/quote]

Thanks for the quick response. My room is EXACTLY laid out like figure 3. I can place them exactly like that.
post #7 of 21
I was trying to be diplomatic about the PSW505. Why you would use two of those is beyond everybody here on AVS...
post #8 of 21
I think Polk designated the PSW line to be...


Positively Sucky & Wimpy
post #9 of 21
Quote:
Originally Posted by schan1269 View Post

I was trying to be diplomatic about the PSW505. Why you would use two of those is beyond everybody here on AVS...

Alot of people don't know about ID companies, they just see what's in their local stores and buy what they can afford. Not everyone is as intuitive as yourself to just skip that step and buy ID subs their first time out.

Anyway, it's not 'beyond' me why someone would use 2 of those...it's just the reality of it. We all start somewhere.
post #10 of 21
Thread Starter 
Thanks Schan for reminding me why I didn't come here sooner. If your life revolves around trashing others then it is a sad life indeed. I have a family and a career and my life simply doesn't revolve around my home theater. I am sorry your does.
post #11 of 21
Quote:
Originally Posted by Seminole94 View Post

Thanks Schan for reminding me why I didn't come here sooner. If your life revolves around trashing others then it is a sad life indeed. I have a family and a career and my life simply doesn't revolve around my home theater. I am sorry your does.

Just ignore the worthless comments, it happens. There's alot of people on these forums who are genuinely here to help. It's the best site for A/V in the world
post #12 of 21
Quote:
Originally Posted by schan1269 View Post

I was trying to be diplomatic about the PSW505. Why you would use two of those is beyond everybody here on AVS...

Just stop. Polk does make some bad subs (I know because I owned 2 of them) but the 505 is actually a decent sub, especially if you got one (or two) at a good price. The OP owns two of these and with room gain, the 505 will actually extend into the lower 20hz range. For most people 2 of these subs will fill a room very nicely with bass. The OP is looking for guidance on something he already owns, the least you could do was try to be helpful.
post #13 of 21
Thread Starter 
Thanks Danielson. We won't be hosting any film festivals in out room. Just playing some Toy Story 3 and watching football on Saturdays. With that said I still want to make good decisions in placement. Even it my equipment is crap (sounds pretty dang good to my untrained ears). I appreciate the support.
post #14 of 21
Quote:
Originally Posted by Seminole94 View Post


Thanks for the quick response. My room is EXACTLY laid out like figure 3. I can place them exactly like that.

I found that Audioholics article quite useful. I have had good luck with one in the front and one in the back towards the corners (will give you more room gain), but option 3 is highly recommend.

Please share your findings. I heard that Tron Legacy on Blu-Ray is a good test of your bass (hint, hint)
post #15 of 21
Quote:
Originally Posted by schan1269 View Post

I think Polk designated the PSW line to be...


Positively Sucky & Wimpy

http://www.hometheaterhifi.com/volum...er-4-2005.html

I trust Ed Mullen anyday over you.
post #16 of 21
Thread Starter 
This is true ack_bk! They were the mere $199 delivered with no tax I planned to spend less that $2,800 for all the equipment including an Optoma HD20, Polk CS20 center, and 8" Polk in wall speakers for my front, rear and sides. With all the cables I have succeeded. With a 12' diagonal screen my family is excited to get this thing done. Me and a friend are installing all the cables tomorrow so this info was important. It sounds like I should run an additional sub cable in case I want to move one of them.
post #17 of 21
I'm not here to trash "others products".

Does the OP already have two PSW505 or just one and thinking of another one?

There is another thread about a guy with 2 Epik subs and a Velodyne. I just gave an option on how to run three subs there.

Yes, we all start somewhere. I started back in the day Quadraphonic was "the new thing", with 4 Panasonic sphere speakers hanging from the ceiling via chain...

And your article proves the PSW point...

A 12" sub that pulls a groin trying to do 35hz...???
post #18 of 21
We have what we have. The goal is to get the best performance out of it. As for dual subs do the crawl test to find 2 good locations that are eqidistant to the listening posistion. Some people get lucky and have a decent room, others dont. Your room is similar to mine. I got lucky and was able to place mine up front next to each main. Good luck to you, and dont worry about what others say about your equipment. I have nice equipment in a nice treated room and i havent listened to my system in months.
post #19 of 21
Quote:
Originally Posted by Seminole94 View Post
This is true ack_bk! They were the mere $199 delivered with no tax I planned to spend less that $2,800 for all the equipment including an Optoma HD20, Polk CS20 center, and 8" Polk in wall speakers for my front, rear and sides. With all the cables I have succeeded. With a 12' diagonal screen my family is excited to get this thing done. Me and a friend are installing all the cables tomorrow so this info was important. It sounds like I should run an additional sub cable in case I want to move one of them.
Sounds like a room your family will really enjoy. Is this new construction? If you have the opportunity to run some conduit in the ceiling for the future, I definitely recommend it. And I do agree with running some extra cables.
post #20 of 21
Quote:
Originally Posted by schan1269 View Post

I think Polk designated the PSW line to be...

Positively Sucky & Wimpy

Quote:
Originally Posted by schan1269 View Post


A 12" sub that pulls a groin trying to do 35hz...???

The PSW505 has in room response down to 23 Hz -3db.... For $200 per subwoofer that's next to impossible to get.

And he already purchased the subwoofers so how about you read the post before mindlessly bash a product
post #21 of 21
Thread Starter 
It is sort of new construction. We have framed out several new rooms in our basement. I have some extra central vac pipe I will take your advice and use. The framing is all that is up now but the drywall goes up Monday. I will post some pics when we are done. I think I will start by wiring for figure 3 but will run the extra to the other spots to be safe. Chances are my kids, wife and buddies will be overwhelmed no matter what.
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