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-   -   "Movie Nights" in Rock River (http://www.diyaudio.com/forums/multi-way/92800-movie-nights-rock-river.html)

theNoid 24th December 2006 03:02 PM

"Movie Nights" in Rock River
 
As many of you know I am no longer living in FL. Instead, we have moved my family to a very small town in Wyoming called Rock River. There is about 235 peeps here total, and I think that number actually includes several of the surrounding ranches...lol. They have a very nice school here which covers K-12 grades.

Anyhow, at the school they have an auditorium where the hold "movie night" every other week for free for the townsfolk. This is sponsored and put on by non-school related people and their personal equipment. Their equipment list consists of an el' cheapo DVD player, DLP projector, an amp and one pro/DJ style speaker. Their screen is several large white posterboards taped together. Overall, not a terrible picture, but as you can imagine, the sound leaves one wanting for more.

So, I have decided to put together a pair of speakers and an amp to power them with. I may even go as far as putting together a real, mo' betta screen as well. Oh yeah, of course no movie on the big screen would be complete without prodigious amounts of bass...agreed?

Here is where you come in folks, I need your help with ideas, parts, funds, or whatever you can throw in the basket here.

Vendors, if you can help/sponsor...please feel free to drop an email if you can help with parts and such.

I will get the details on the room as far as dimensions and such later today.

Until then, let me know your thoughts and ideas here please. Remembering of course that this project needs to stay on the cheap as much as possible.

Noidster

LightwaveDude 24th December 2006 03:26 PM

Look at the Mach5 Audio MJ-18 subwoofer for covering the bottom end. Should displace a ton of air on the cheap.

http://www.mach5audio.com/index-2.html

theNoid 24th December 2006 03:53 PM

Hey thanks for the reply. I will indeed contact them about shipping and such overall price for a pair of these bad boyz.

However, I do think we will need more output overall though since the auditorium seats about 150 people total. It is very theater-like in that it has movie-type seating that is on an incline from back to front. Each row of seats has between 10-12 seats across and there is about 15 rows of seats if I am recalling correctly. Overall a very nice room for such a thing but the complete lack of good sound on movie night disturbs me.

At first my thoughts are going with some largish arrays of some sort.

As for the subs, I was thinking along the lines of 4 Q15's or the likes in a large ported enclosure powered by 1000 watts or so. But now that I have looked at the Mach5 18"ers I will be contacting them about it all, thanks.

For the arrays, I was contemplating using the Dayton DC130BS-4 5-1/4" due to it's relatively cheap price and higher sensitivity rating. Maybe 8 per side...maybe more?

In the tweeter category, I am just not sure as of yet.

I'll be honest with you, if we can get a vendor or two or three to pitch in here and help sponsor the project, that'll be the deciding factor of what drivers get used. If not, then it will be up to my wallet and we will shoot for cheap and easy here...lol.

Noidster

jbush 25th December 2006 01:49 AM

Why are you in Rock River? If it is for the oil/gas/cbm boom, hit up those companies. A lot of them contibute generously to local community events. Personally I would look for used PA gear out of the Denver area. Good Luck, keep us informed.

theNoid 25th December 2006 11:58 AM

We are in Rock River because this is where my wife was born and raised. Anyhow, I am not wanting to just go used pro route because I think it would be greater gift with more heartfelt if done DIY with my hands. I am also including two of the seniors in this project as they will be assisting me with parts and pieces in their woodshop hopefully.

Noidster

theNoid 25th December 2006 01:30 PM

Welps, AJ from the PE board has generously donated an older Pioneer receiver for the project. This receiver will support us with a solid 200 watts RMS per channel.

As for now we are going to try some arrays using 16 of the Onkyo buyout 4"x6" drivers coupled with 32 of the Onkyo buyout 3/8" tweets per side. Will prolly just run a simple textbook cap and coil on the drivers at first and see what happens.

The subwoofer category is still up in the air but we will get that nailed down on the cheap soon as well I hope.

Your thoughts on all of this...???

Noidster

clearwaterms 25th December 2006 06:26 PM

Quote:

Originally posted by theNoid
Welps, AJ from the PE board has generously donated an older Pioneer receiver for the project. This receiver will support us with a solid 200 watts RMS per channel.

As for now we are going to try some arrays using 16 of the Onkyo buyout 4"x6" drivers coupled with 32 of the Onkyo buyout 3/8" tweets per side. Will prolly just run a simple textbook cap and coil on the drivers at first and see what happens.

The subwoofer category is still up in the air but we will get that nailed down on the cheap soon as well I hope.

Your thoughts on all of this...???

Noidster

Are you planning on powering the entire line array simply on that power assy? only 200W per channel? Are you considering the DIY amp setup as well?

johninCR 25th December 2006 10:27 PM

To reach 15 rows back you'll probably want to go much taller. Maybe double up and make it a foldable unit. Personally, I would go OB for more natural dialogue. For the bass, use a number of cheap drivers, say 8, each in separate cabs. Spread them out in a horizontal array on 4-6ft centers depending on the room width and XO frequency.

Keep an eye on www.MusicSupplyCenter.com for their scratch-n-dent stuff. I picked up 6 of their Warrior 15's for $20 ea that would have been perfect for what you need. If you got a deal like that you could even go OB for the woofers. No use trying to go much below 30hz in a school auditorium as you'll likely just stimulate a ton of room rattles. An OB array would really help reduce rattles by focusing the output in the listening area.

As long as those Onkyo's are decent sounding with arrays you should be able to create better sound for that size audience than the vast majority of theatres. It sounds like a fun project, and don't worry that 200W is more than enough for the mains. Also, line arrays is definitely the way to go because they spread the SPL so much more evenly across a room which would enable the screen to be closer to the audience and improve the size ratio.

Talk to one of the screen manufacturers and try to pick up a large piece of glass beaded material for a proper screen. The extra gain will enable a larger screen size with the same projector. Projectors are becoming so powerful that they sell very little of their glass beaded screens. As long as the audience isn't more than 20 degrees or so off axis, glass beaded is ideal for your use, despite being an older technology. A larger screen is warranted with the larger sound you are soon to provide.

Cameron Glendin 26th December 2006 09:26 AM

OK my background is in cinema sound, and I know a bit about screens.

Firstly I would forget about arrays, cinema sound works better and is mixed for horn loaded mid and high sound. This allows clearer dialogue in average to poor accoustic sounding rooms by preventing early reflections.

P. Audio has several speakers drivers at affordable prices, A simple 12 inch or 15 inch E series 200w RMS woofer and a small compression driver with a one inch horn (60x40 or 90x40 pattern) plus crossover in the 1.5k range, in a solid ported box would do. perhahs 2 to start with, less than $500. at 97db per watt, your 200w reciever would be extremly loud when needed, films have quite a dynamic range.

Ultimatley, you could add a centre channel, and several wide/ midrange speakers around the room 4-8 as the surround channel.
and a subwoofer. P. audio e 18 is cheap and loud 97 db@1w 1 metre.

As for a big 16/9 screen, one of the cheapest ways is to get a large sheet of calico (cheap) and staple it on a timber frame then paint with a flat plastic paint, as the paint dries the fabric shrinks, giving a very flat surface. Black gaffa tape around the edges gives a real cinema feel, and a reference for black.

Next thing you know the shed or small hall will be just like a real cinema

:D

Ps cheap dlp projectors tends to rainbow on gain style screens, glass beaded style ect. the flat paint style on calico, if rainbow is an issue, gray shade of paint can minimise this, but is usually required only if the screen is small.

Cameron Glendin 27th December 2006 09:02 AM

These links will show you how a good sounding small cinema should be set up. obviously JBL is expensive but atypical of a quality cinema sound systems




cinema speaker setting up / JBL

JBL small systems

Note
THX style of speakers need a well thought accoustic's, standard range works better in reverberant or normal enviroments.


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