Film-Tech Forum ARCHIVE: The Ultimate Budget 35mm Stereo Setup

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Posted by Don Furr (Member # 1469) on 01-04-2003, 10:40 PM:

For those who want a great 35mm stereo home screening room and don't want to spend a ton of money I offer the following specs from my home system.
A pair of DeVry 12000 projectors with standard 1000W (updated) lamphouses....Kelmar stereo pickup chips straight to a Smart SR-300 dual projector processor.....out to a Pro Logic home theatre receiver...out to left, center, right, surround and a powered subwoofer speaker. The receiver is much cheaper than buying the amps. The picture is great and the sound will blow you away! Trust me..it's a great system.

Posted by Gordon McLeod (Member # 33) on 01-04-2003, 11:12 PM:

It works been done before but the SR300 is only single band NR

Posted by Steve Kraus (Member # 476) on 01-05-2003, 10:15 AM:

With CP-50's going for as low as $100 it's difficult to get too excited about anything involving an SR-300. A hundred bucks doesn't get you SR (although those were offered at $300) but even A is better than nothing. A home system's Pro Logic decoding might be decent enough but with no slit loss correction and 1/3 octave EQ I think I'd take the CP-50. Better yet spring for one with SR.

Posted by Richard Fowler (Member # 893) on 01-05-2003, 10:26 AM:

Wait a couple of months and the new processor from Smart will be ready for delivery with a street price of $1000 - 1100.00 with SR like capability....USA design, China construction like other manufacturers are doing like the QSC RMX / ISA series of amplifiers.

Posted by Mark Gulbrandsen (Member # 72) on 01-05-2003, 10:49 AM:

I'd still put in a used CP-50 as long as the system didn't call for 5.1 in it. CP-50's still sound really good if they have all the upgrades in them. Adding an off the shelf large switching power supply in place of the original power supply is probably the best mod you can do to them. Tightly regulated supplies always comtribute to better sound in just about any audio type item, and less overall noise in the system. I have about 400.00 in my fully upgraded CP-50 with SR and type A! Lets see someone beat that deal with a new "equivelent".
Mark @ CLACO

Posted by Tom Wienholt (Member # 1510) on 01-05-2003, 12:51 PM:

Mark
What are the specifics on the power supply that you used to upgrade the CP50? What is the make and model, etc.?

Posted by Tom Wienholt (Member # 1510) on 01-05-2003, 12:53 PM:

Also
Where did you get the cards to upgrade your CP50?

Posted by Mark Gulbrandsen (Member # 72) on 01-05-2003, 01:13 PM:

Tom,
I will have a look see inside and see what the manufaturer of the PS card was and the model number. It is an off the shelf piece.
Got some of the cards form a guy that used to work at Premiere Seating but he is no longer there.......donno where he went to.
Mark

Posted by Dan Lyons (Member # 1454) on 01-05-2003, 01:33 PM:

Steve, who has CP-50's for $100??? I've seen that model sell for several hundred up on Ebay. I'm going to need one pretty soon, any leads?

Danny

Posted by Steve Kraus (Member # 476) on 01-05-2003, 01:48 PM:

That was based simply on perusing the offerings right here in the F-T equipment wanted and for-sale forum.

Posted by Gordon McLeod (Member # 33) on 01-05-2003, 02:52 PM:

Regularly they go on ebay for under 300.00 as well as CP100's

Posted by Steve Guttag (Member # 268) on 01-05-2003, 03:57 PM:

I think if you do a search on the threads here, Mark listed the power supply with a link to it's spec page and everything.

Steve

PS....I believe the thread is here CP-50 power supply thread

Posted by Mark Gulbrandsen (Member # 72) on 01-05-2003, 09:18 PM:

Thanks Steve for finding that. Tried the link and its dead. I have to pull out some modules and look at the Manufacturer and model....will try to yet tonight....for now its back to the Barbecue Grill!
Mark

Posted by Mark Gulbrandsen (Member # 72) on 01-05-2003, 10:04 PM:

K dudes, here's the info on the switcher. Its a Power One model MAP110-4001. The specs are +5 Volts @ 12 Amps, +24 Volts @ 3 Amps, +12 Volts @ 1 Amp, and -12 volts @ 1 Amp. The nice thing is that AC in can be 85 to 264 volts! The 5 volt section of the supply is not used in the CP-50. So if yuo are going to go out and buy one of these go for a triple output supply with the same ratings, instead of the quad output. I got the supply as new surplus for 20 bucks. New ones are ALOT more than that but there are alot of places that sell surplus switchers, so check around. I am also posted a better photo of it with the cards removed from the main frame. An IEC cord input filter assy should also be installed at the time of Power Supply replacement. I've run this for hundreds of hours without so much as a burp from it. The other nice feature of these supplies is that they shut doen in an overload condition!!
Here is a good link to the spec page.........

http://www.power-one.com/resources/products/datasheet/map110.pdf

Posted by Tom Wienholt (Member # 1510) on 01-05-2003, 10:11 PM:

What exactly does the IEC cord input filter do? Also, why is it needed? Does the new power supply plug in just like the old one?

Posted by Gordon McLeod (Member # 33) on 01-05-2003, 10:20 PM:

Supresses noise coming in and out of the powersupply
small switching supplies can still superimposse massive amounts of harmonics on the power lines

Posted by Mark Gulbrandsen (Member # 72) on 01-05-2003, 10:30 PM:

Sorry for leaving that explanation out. The IEC input filter is needed because the original power supply casing has this built in to it. The assembly also provides alot of extra line filtering(comming in and going out!) if you buy a decent one. Although switchers have higher noise immunity than brute force DC supplies, and it could probably be left out my personal feeling is that you can never have ENOUGH filtering of the AC line in a booth.
To mount it you have to remove the right hand end panel, and drill mounting holes for the supply. Use 1/2" standoffs to mount it This is a standard, industry wide PCB style, so if the replacement supply ever fails then any equivelent power supply will also bolt right in place. The original DC connection cable was utilized. I soldered it to the output of the supply and left the original Molex to plug it into the backplane. Ya can Molex it at both ends if ya want to....but personally I stay away from as many DC plugs as possible....there's been way too many falures of the in line Molex connectors in the last 20 years...mainly from them not being able to handle the current flow. Anyone wanting to do this mod let me know and I can supply more info such as bolt hole layout, and the proper IEC input filter.
PLEASE NOTE THAT THIS MODIFICATION IS NOT UL RATED(Although the supplys are). DO THIS AT YOUR OWN RISK!!
Mark @ CLACO

Posted by Tom Wienholt (Member # 1510) on 01-06-2003, 06:46 PM:

I am interested in doing this modification. Let me know the specifics on the IEC filter.

Posted by Mark Gulbrandsen (Member # 72) on 01-06-2003, 11:29 PM:

Tom,
Here is the IEC filter/connector that I use, good for 6 amps....mainly cause they are available in quantity, locally and cheap! This type of unit is VERY common in electronic items produced today. The make is Schaffner and the model is FN-323-10 05. I think I only pay 3 bucks for these.
Mark