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 91 
 on: November 18, 2017, 08:27:53 pm 
Started by Justin McInvale - Last post by Ben Mehlman
The skating rink/bowling alley I DJ at has a computer feeding the rink sound system and both bowling alley systems.

The A/V guy wants to add a box that will permit easy connection to all three systems.

The skating rink system is easy to add the input to as it uses a regular mixer and had a free input channel.

The other two are fed from a Samson S-zone 4 channel 4 zone mixer which has one output going into one input of an amp which feeds two speakers in one bowling area and the other channel is set up the same.

The idea is to have a separate input for the two bowling systems that when an input is plugged in will bypass the output from the S-zone and feed the input to its respective system with only a single control for the level.

I'm thinking that I need an active box with three stereo channels and three separate mono outputs with a level control for each.

How can I do that?

Is there a ready made solution for what I'm wanting to do?

Do you actually need to switch between inputs remotely, from your location?  Or is it good enough to be able to walk over to the location of the s-zone when you need to switch?  If it is, then the simple solution here is to put an input wall plate at your DJ location, run a cable from that to an input on the s-zone.. then run another cable from one of the zone outputs on the s-zone to the input on the mixer in the rink.   Now you can just select your input on the s-zone to feed all three areas, and control the volume from the input on the s-zone, or from your DJ mixer. 

In addition.. the s-zone has a ducker feature.. so if you were to use input #1 on the s-zone for your DJ feed, and set that up to duck the other inputs.. when you start DJing it would lower all the other inputs.  But I don't know if it would lower them all the way, or if the timing of that (how quickly it raises it back up again when your input stops) would be sufficient for your needs.  But you could try it....



 92 
 on: November 18, 2017, 08:03:37 pm 
Started by Justin McInvale - Last post by Justin McInvale
The skating rink/bowling alley I DJ at has a computer feeding the rink sound system and both bowling alley systems.

The A/V guy wants to add a box that will permit easy connection to all three systems.

The skating rink system is easy to add the input to as it uses a regular mixer and had a free input channel.

The other two are fed from a Samson S-zone 4 channel 4 zone mixer which has one output going into one input of an amp which feeds two speakers in one bowling area and the other channel is set up the same.

The idea is to have a separate input for the two bowling systems that when an input is plugged in will bypass the output from the S-zone and feed the input to its respective system with only a single control for the level.

I'm thinking that I need an active box with three stereo channels and three separate mono outputs with a level control for each.

How can I do that?

Is there a ready made solution for what I'm wanting to do?

 93 
 on: November 18, 2017, 08:02:30 pm 
Started by Alex Davis - Last post by Alex Davis
That diagram doesn't tell me much.  I assume?? one side of the relay coil goes to black?

It could be that the second radio is not referencing the same ground internally-depending on the actually amplifier circuit running the headphone jack.  Are you using 2 wires from the audio out or just one?

Hi Stephen- thanks for the reply. I think you're on to something. If the amplifier is different- potentially not using a true ground the way the first radio did, I cannot reference either speaker lead to the ground, or i risk ruining the amplifier right? (even if this was the case, i should get a reading as i pulled the signal to the ground, shouldn't I?)

Sorry for the junk diagram. In the initial setup i only had the (+) speaker wire connected to my trigger wire. the relay is grounded, so current on the audio out (+) wire would pass through the relay to the ground (relay is grounded through 12V power source).

Knowing this- any suggestions?
 * Connect both speaker leads (+) & (-) to the trigger wire?
 * Find another way to determine when radio is active because i cannot "Ground" either speaker wire in this case due to bridged amp?

Thanks again,
AD

 94 
 on: November 18, 2017, 07:55:08 pm 
Started by Alex Davis - Last post by Stephen Swaffer
That diagram doesn't tell me much.  I assume?? one side of the relay coil goes to black?

It could be that the second radio is not referencing the same ground internally-depending on the actually amplifier circuit running the headphone jack.  Are you using 2 wires from the audio out or just one?

 95 
 on: November 18, 2017, 07:03:37 pm 
Started by Alex Davis - Last post by Alex Davis
In case it helps, I am attaching a picture of the little circuit I have (Red is DC+, Black is DC-, Green is my Audio wire and specifically the positive conductor in the cable). The relay is looking for a change in voltage (from below .5V AC to above .8v AC) in the trigger wire.

With my first radio I go from  0V AC (when radio is silent) to 4V AC (when radio is active). With the second I get the goofy phenomenon described above.


Let me add one question. If the headphone jack on the second radio was a mono jack... would the phenomenon above make sense? One portion of the manual (specs) says it's stereo but another mentions it is mono. I tried a mono cable in the circuit and get no reading whatsoever (no 8v going to 0).

Thanks again for taking the time to read and consider a response!

Alex

 96 
 on: November 18, 2017, 06:32:00 pm 
Started by Alberto Escrina - Last post by Peter Morris
I find it interesting that most of us got into the sound business because of "the sound"  and listening to music.

And yet it seems that sound quality is not all that important to many.

"Good enough" or "sounds OK to me" is just fine these days.

Maybe one day accuracy and quality of sound will become important again.

Ivan I suspect I am every bit as passionate about sound quality as you, but to stay in business some times that does not matter.

For example in a couple of weeks I start the "mad" Christmas season; I have a Christmas carols event for about 3000 - 4000 people on Friday, Saturday another one in a different city for 5000 - 6000, and then another one on Sunday  ... in a different city for about 6000 people.  These are all free community events with almost no budget.

For me its all about logistics, the gear has to come out of one as quickly as possible and be set up the next morning in another location ... its about whats quick and easy, whats I can fly that weighs less than 220 kgs, and what  fits in the truck and will get the job done.  I could hire another truck and load a second system, but the truck hire costs will blow the budget out to the point where the show would not be worth doing.

The following week I have another one ... 3 x J3-94's would be perfect but the system has to be carried down steep hill on hand carts and the J3's are just too heavy, and the customer wants a line-array ... once again its all about logistics and meeting the customers expectations  :(


 97 
 on: November 18, 2017, 06:25:33 pm 
Started by Alex Davis - Last post by Alex Davis
Hi all,
     I'm new at this stuff so please forgive me where I seem ignorant! I created a small circuit with a relay and timer such that when audio output from my radio scanner is detected, a bell will ring and a light will come on (think waking people up at a fire station for a dispatched emergency).

    The relay is activated by the ~4v AC I get when the radio is active by taking a stereo 3.5mm jack out of the stereo headphone jack on the radio. It's 0v AC when radio is silent.  This plug terminates in a dual RCA connection with the right channel attached to a speaker and the left stripped down with the positive wire linked to my relay. It works great!

    Now the issue: I swapped this radio out for an older model capable of the same functions and- according to the manuals- the same headphone jack (3.5mm stereo 6mW at 32ohm).

    When I try to read voltage off of my audio out wire now this is what I see: when I power the unit on, I get 8vAC and then it slowly falls to zero. After that, I get no voltage reading even when the radio is active, but I do get the sound just fine (since I have the Right RCA jack plugged in to a speaker). I did try to read voltage off the male end of right channel rca that I know delivers sound to the speaker and I get the exact same result.

     I feel like the issue has to do with the grounding in this particular radio, but I'm not knowledgeable enough to figure it out (could also be totally wrong).

     Anyone have any ideas what could cause this phenomenon? As soon as I swap the radios back everything works fine with no changes (including any setting or config on the meter). Any tests you'd like me to run to help?

Thank you all so much in advance!
Alex

 98 
 on: November 18, 2017, 06:24:47 pm 
Started by Rodney Connelly - Last post by Jonathan Goodall
They even gift wrap...

 99 
 on: November 18, 2017, 05:48:36 pm 
Started by Zaharescu Mihai - Last post by Zaharescu Mihai
Thank you for the replies.
Unfortunately I removed the processors, leaving just the two amplifiers the mics and speakers and the problem persists. I am sure that they used to work in this simple configuration. We are in the process of adding the exterior monitors so I can test each amplifier individually like you said.
This problem also doesn't seam to be impedance related because we just split the output from the processors to enter in both power amplifiers, reducing the impedance by half and no gain in noise levels can be noticed. Also we added two monitor volume controllers between the processor and poweramps that can increase the impedance to infinity and still no difference in noise levels.
This looping hybrid system emerged because we used to have only the two amplifiers, but they were unusable in the church because there was so much echo that feedback emerged even at unusable low volumes. That is why we also bought the processors and 100 v monitor controllers. For about half a year everything worked perfectly, until someone decided to push buttons. For three months it worked at very low volume because of the bad configuration and when we tried to redo everything a few weeks back (including cables and adding external volume controllers in order to lock the devices) thus we noticed this problem trying to get back to normal volume level.
The loop is as follows: because we don't have a mixer, the amplifiers are used as mixers, we need to construct the final signal by connecting them together (because we have 11 mics and 6 channels per station). Than the complete signal is feed through the processors and the processed signal is sent to the amplifiers that have an input that connects directly to the power amplifier, disconnecting the internal signal (thus it actually doesn't create a loop, just splits the two devices in preamp and poweramp with no connection between them). Thus the TOA stations are split in half: two mixers connected together that output signal in the processors and the power amplifiers that are completely disconnected from the mixers and get their signal from the processors.
If I am not clear enough please tell me so I can try to explain better. I'll get back to you as soon as I test each TOA individually.
Somehow, temporarily, we managed to avoid the distortion by setting very low microphone sensitivity (about 9 'o clock) and very high volume, but I know that it used to work with sensitivity to the max without problems (except for the more noticeable mic noise) as the mics are ambient mics, above and rather far away from the singers.
About the speakers, they are 100v. The power amp is the high power amplifier and it is the last in the chain (before the monitor controllers that lower the volume for the closest monitors to the mics).
We also tried to keep everything balanced, the problem being that the outputs of the TOA are only simple RCA, I don't know why...
Thank you for your time :)

 100 
 on: November 18, 2017, 05:26:41 pm 
Started by Wes Garland - Last post by Lyle Williams
I have tiny 1sq inch mirrors held by a magnet that are used to direct the laser upward/outward while the derby effect falls on the floor.

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