In Wall LC265i mounting question.

vinnyfl

Hi

I have just purchased 3pcs- LC265i & 2pcs- LC80i for my home theatre/music room. I do have a lot of flexibility in mounting because I am building a 'dummy wall' 4"-5" from the cement house wall for my plasma and wall speakers. (so the dummy wall will have a solid concrete back because it is the main wall of the house is solid concrete) My question is: should I build some type of boxes in the wall with some drop ceiling tiles or insulation? Or are the speakers made to breath in the open wall? Also the same with the ceiling, I have a concrete ceiling 4" above the sheetrock. (No I don't live in Bedrock!)

So I am not working with a 'hollow' framed house.

Any input would be appreciated!

Thanks in advance.

Vinnyfl

cewolcott

Hopefully you have already held the LC80i into the ceiling cavity. They are 5" deep, but your message says you have 4" + 1/2" sheet rock. Make sure to look at this. You have the exact same setup that I am building. I have built and equipment closet behind the TV wall. I designed the wall and the framers built it perfect. I had them put in a brick (6 rows of horizontal studs 24" wide) (so that I could mount to LCD bracket with several inches of play). I also bought the LC265i enclosers and have them current mounted in the wall. Haven't bought the actual equipment yet because the basement still has two months to go. The electrician starts tomorrow.

vinnyfl

Sounds like you did a nice job. Thanks for the heads up on the ceiling and I actually have around 8"+ up there. Wheww.

I see you used the enclosures. Where did you get them and how much$$. I have a feeling they are costly for a MDF box. Is there somewhere I can find the dimentions to make my own enclosures?

What system do you have driving the speakers? And what Sub?

okiepolkie

Depending on your dealer, the prebuilt boxes really aren't that expensive. They seem to be pretty solid and it just completes one more step in the process for you.

Enjoy your new setup, it sounds like you are on the right track.

Zach

BTW, welcome to the forum-both you since I haven't posted for either one of you yet.

Larry Chanin

vinnyfl wrote:

Hi

I have just purchased 3pcs- LC265i & 2pcs- LC80i for my home theatre/music room. I do have a lot of flexibility in mounting because I am building a 'dummy wall' 4"-5" from the cement house wall for my plasma and wall speakers. (so the dummy wall will have a solid concrete back because it is the main wall of the house is solid concrete) My question is: should I build some type of boxes in the wall with some drop ceiling tiles or insulation? Or are the speakers made to breath in the open wall? Also the same with the ceiling, I have a concrete ceiling 4" above the sheetrock. (No I don't live in Bedrock!)

So I am not working with a 'hollow' framed house.

Any input would be appreciated!

Thanks in advance.

Vinnyfl

Hi Vinny,

If you don't want to purchase Polk's performance enclosures you can frame out the appropriate amount of volume for each speaker. Refer to page four of the LCi Technical Information document.

If you build a 4"-5" cavity between a concrete wall and a false wall it will start to resonate, especially if you place speakers in the false wall. Regardless of whether you install speaker enclosures, I would recommend filling the cavity with fibergass batt insulation to avoid these resonances.

I'm using a pair of LC265i in Polk's performance enclosures for my surround back speakers. I'm powering them with a Parasound HCA-1500A amplifier which delivers 315 watts RMS to each of the 4 ohms speakers. Here's a photo of one of them. The photo shows the speaker with furring strips and polyester batting around it. This is part of the acoustic treatments placed on the walls. Acoustically transparent fabric is then stapled over the speakers to conceal them without affecting the sound. The wall in which these speakers are installed is 6" deep and it is filled with fiberglass insulation.



Larry