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Question: can you mount the speakers on the ceiling if you buy the mounts or are they wall mount only speakers
Document: I'm giving this a 5 because I feel like for the price I got a very good system with all the right features. It is true like others say the satellite speakers aren't that great, and the satellite speaker mounts I bought didn't fit them at all. But then these speakers seem to be designed to hang from the wall and not from a mount on the ceiling.
It works quite well.Update 5/8/12:I've now moved into my new house and have this system set up and wall mounted.A few things:-Attaching these speakers using mounts is a pain. They only have a keyhole mounting option, and the mount set I bought which said it was compatible with keyhole speakers did not work. I had to buy some additional nuts and washers to get it to attach.
The center speaker takes two mounts.Videosecu 6 Black Universal Satellite Studio Speaker Mounts / Brackets for Walls and Ceilings 1UPI would like to echo complaints about the key hole mount system - it is flimsy and does not inspire confidence.Buy better speaker wire. The included wire is cheap and also short.It does not "upconvert" video. This means that it doesn't change multiple video sources (like HDMI, component, composite) into one HDMI out.
I solved the mounting issue by buying videosecu (from amazom) mounts that allow mounting of keyhole mount speakers.
Everything is color coded per speaker and easy to install. The product was packed securely. Unforunately, the speakers do not have a spot to attach mounts to tilt them on the wall. Unless you don't mind sliding it down over a screw (like a clock hangs up), that'd be a nice feature to add; however, I'm sure there are many ways to customize that to work.
Talk about Bang for your Buck!Paid $250.00 at Amazon.Hook up was a breeeze (HDMI). Easy to set up the audio manually.Played "Lord of the Rings 2"..........amazing sound quality.This is my first Home Theater and Im very impressed.Cons: Cheap speaker wire, will upgrade.No brackets to mount wall speakers or adjust angle's.
The positives: HDMI connections and the speakers work great (considering their power rating). The speakers are light so they were easy to install on the wall (you have to buy the hardware separately). The choices for sound presets are a plus. It provides a lot of customization through its software.
Trust me,it's a really nice piece.it looks really nice too. In order to wall mount them you will need a bracket that fits a key hole . Basically it's designed to apply a screw or flat head screw on the wall and lock the speaker down on to it. There is many ways to adjust the audio in each speaker etc.
Also purchased Videosecu universal speaker mounts, but had to modify (drill) the satellite speaker boxes to mount them. The key-hole is not large enough for the stud in the Videosecu package. Other than that, the system sets up easily. One other issue I have  is the on-screen interface for USB-connected components, specifically for the iPad and iPhone. Rather cumbersome. Would prefer to use the touch-screen interfaces on the iPad/iPhone.
The Onkyo HT-S3500 5.1 Home Theater Speaker/Receiver package is great value for the money. You get everything you need for HD sound, except a HDMI cable and speaker wall mounts. But make no exceptions, this package is for someone who wants an affordable entry level. For under $300 its a 5-star product, but this AVR (audio video receiver) can't compete with the higher end models.
Answer: I used these mounts VideoSecu 4 Black Universal Satellite Speaker Mounts / Brackets for Walls and Ceilings 1VE (Black, 4 Pack) and mounted them on the ceiling.