Originally Posted by rslaback
The church my wife serves has grown in our A/V needs. When we got here it was pretty much a single mic setup with a tape deck and cd player added in. The Clavinova electric piano was also run through the PA system. Right now it involves disconnecting items based on what we want to use each service.
A previous pastor was a tad more of an audiophile than I am and had set up the system. It is a small country church so this task falls to me. There isn't money in the budget to really do anything so the project will most likely be funded by my wife and myself.
The system as it is set up right now has 2 wired mics running through a 1/4" jack into a Realistic 32-1200C 7 channel mixer console. One channel of a Shure T88 Wireless is plugged in as well. The console has 3 mic inputs and 2 either/or channels that run RCA type inputs.
The Clavinova is plugged into an RCA input as is the tape player, cd player/recorder and the computer we use for worship powerpoints. Because the input channels are either or we cannot use the Clavinova and the tape deck together, nor the cd changer and the computer together.
The mixer has a stereo output via rca cable to a Radio Shack MPA-250 Amp.
The amp feeds (via banana plug) twin stacks (2 each) of Optimus 15" 40-0115 8 ohms speakers which are currently wired in series.
We also have on hand (but not hooked up), a working Soundtech QuickMix6 (QM6). This is a 6 channel mixer, amp combination. It has 6 channels (4 XLR/Line and 2 Line/Line) as well as a single RCA Pair input.
Here is what we would like to have when I get done:
2 wired microphones
2 wireless microphones
1 Clavinova (the headphone out appears to be a mic level input)
Tape Deck (RCA input)
CD Player/Recorder (RCA input)
Computer (RCA input)
DVD Player (RCA input)
Monitor speaker in the nursery of our church (with a localized to the speaker volume control)
Output to Tape Deck for recording purposes
Output to CD Recorder for recording purposes
Some questions that I already have:
1. With a PA system like this is there any reason we need both channels of the RCA inputs?
BTW, what Greg said.
Depends on the source. If the source is stereo, then there is a good chance that the channels are different, and disconnecting one will cause you to lose some of the music some or all of the time.
2. If the answer to the above question is yes, each input requires two channels (each with a RCA to 1/4" line connector), correct?
Yes. BTW, most live sound systems, are mono. If they are multichannel, the channel separation is often very low, like 6 dB. There may be two or more channels someplace in the system, but by the time the signal reaches the speakers, its mono. This solves a lot of problems like stereo sources with one musician on one channel and another on the other channel and people on the sides of the room hearing only one of them.
4. I can't seem to find a mixer with a lot of rca inputs (based on my figures, keeping both channels of the RCA inputs we need a 13 channel mixer). Is there any reason I couldn't use a home receiver to connect all the RCA channels to the mixer? Possibly even the QM6 we already have?
You are working with toy junk. I just had to say that. Even among very low cost mixers, you don't have anything like professional tools. They aren't all that extendable.
Here is an example of what many people call cheap junk, but it is a far better grade of cheap junk: http://www.musiciansfriend.com/mixer...FUio4Aodnz04zA
Notice all of the differences between it and what you have. I hope you can see that it is better and far easier to use than what you are now using. BTW, I have bought and used a number of the items shown in the link, and it can be made to work very well, thank you.
For example, at church I have a roll-around general purpose AV cart, which is centerpieced by a Behringer mixer that cost under $100. It has been hauling the mail
for years, and plumbers and grandmothers happily use it after a moment's familiarization.
5. If I use the QM6 do the speakers need to be wired in series or parallel?
Probably parallel. Unfortunately the Soundtech QM6 is obsolete and not even the vendor's web site seems to have anything with any detail about it. One of the symptoms of dealing with junk, junk, junk!
The QM6 only has 1/4" outputs, is it even possible to wire the speakers in series with this amp?
Yes, but it would help to know how to solder. 1/4 jacks are a legacy form of speaker connection for PA systems. You can get the connectors at Radio Shack and you can find rafts of cables and connectors online at sites like Amazon and Musician's Friend. BTW the PA equivalent of Radio Shack is called Guitar center. Other than plugs and jacks, staying away from Radio Shack is probably a good career move.
6. The QM6 has an EFX and EFX return jack. What are these?
EFX stands for effects, which means tone controls and reverb and sound effects like that.
7. Does the QM6 even have a monitor port? If not how can I get the nursery speaker and the to Tape and to CD outputs?
I don't know about the CD output (no documentation, remember?) but the tape output could probably be routed to another mixer or amplifier with volume controls.
8. I realize my wife and I will most likely be buying something to make this all work. My guess is a larger mixer. Can you give me a ballpark cost on any equipment we need to buy.
Real live sound mixers start around $50 and up, depending on how many inputs. If all you have is line level inputs or just a lot of them, there is a device called a Line Mixer, whose outputs you plug into a regular mixer. Real mixers have inputs that can handle either line level inputs or mics.
Real live sound amplifiers start around $200 and go up. Real live sound speakers start around there and go up. Depends on what you need and what you want to spend.
One of the things that most live sound speakers have is a socket in their bottom so that you can easily elevate the speaker so that it shoots sound down on the audience.
BTW, there are many live sound conferences on the web, but PSW really isn't one of them. This one is a good one:http://forums.prosoundweb.com/index.php#c5
Thank you so much for reading through all of this. I have setup my home theater no problem and I know my way around electronics but PA type setup is all new to me. I hope to learn. Any thoughts/comments/donations/cookies and offers to help are appreciated.
As Greg suggested, church AV is like the Rodney Dangerfield position in any church. It is a great opportunity to grow spiritually due to intentional abuse by other (probably in some sense well-meaning) Christians in your church. They generally have even a lesser technical clue than you, but a few of them will a priori always think they know your job far better now than you will ever know it, even after you have a decade or two of experience and training.
You will also be blamed, perhaps vociferously and rudely in public and even during services for everything that sounds bad or is too loud, even if it is an acoustic instrument that you have no control over. If the HVAC makes funny noises, your sound system and your apparent incompetence will be the first to be blamed. You will be flamed without recourse by the most influential members of your church.
I only say this because this has been my life for the past 12 years. ;-)