Instruction: Answer the given question using the supporting document.

Input:
Question: Do I need construction brackets for Polk Audio RC85i speakers?? Please let me know someone before I place the order?
Document: I'm using this as the center channel speaker for a 5.1 sound system. I used all polk audio vanishing series speakers (65-RT front speakers and 620-RT for the surrounds) with a Yamaha RX-671 receiver. I appreciated the swivel tweeter feature since I wasn't able to place my speaker in the ideal position. I had a stud near the center of the wall were I have my TV and couldn't place the center channel exactly in the middle.
Polk Audio Dual 5.25" Two-Way Center Channel In-Wall Speaker is the way to go when not having enough space for floor speakers. nevertheless, the sound that these speakers generate makes the in wall installation worthwhile. I installed these speakers myself but, like others I had to install them into the ceiling and, after insulating and installing them into the ceiling they complement my Polk Audio RC85i in wall speakers and, my Polk Audio RC80i in ceiling speakers magnificently...
Initially, I wasn't sure if the Polk sound would please me. Let me reassure you that not only am I pleased but really satisfied with my new in-wall surround sound. It's really like sitting in the movie theater with a bag of popcorn.
Background: First off I am writing this based on my experience with many Polk Audio products, including: other Vanishing/RT series speakers, TSi 400 floor standers, CS20 center, OWM 3'S and 5'S, and finally several subs such as the DSW Micro PRO 1000, DSW Pro 550wi, and PW125. In the past i have also owned several products by "high end" brands such as B&O;, Martin Logan, etc...
I use the 255c-RT as the center speaker for six other RC Polk speakers. I am no audiophile, but it sounds great to me. Outside running the cable - man I hate attics - the install was easy and they fit great in standard 2x4 spaced drywall.
I am running 2-265s for front, 80 F/Xs for rears and a 255 for a center channel. They sound great, especially the midrange. I have another setup in my house using the Polk RC series and there is a vast difference. I am using a Polk PSW-550 sub to round out the system and they all sound great. I am driving them with an Onkyo 509 receiver. They are well built, the mounts are visibly more robust than the RC series speakers.
Installed this with the matching surrounds and stereo speakers. These are easy to install (unless you hit a stud) and they sound great. Careful when you paint though. The first sprayer I got blew gunk and it was irritating and didnt leave it smooth. I may order a new cover and respray with a sprayer I later bought for the others.
Each speaker is wired with 14/4 CL3 in wall/ceiling.Use: I installed this center channel to replace a 620RT which had been improperly installed by an audio/video tech in my dads basement home theater/multipurpose room.
This was a breeze to install. Polk provides a template and easy to follow instructions. Sounds great and is a nice addition to any home theater system.
Like many other in-wall speakers the base is not that great but for me it doesn't matter since I have a subwoofer as well.
Answer: Not needed from my experience. The included bracket hangs firmly from the drywall.