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Looking for a passive way to combine the outputs of 4 synth modules.

My old Samson MPL1204 Mixers are getting old and cranky (http://www.samsontech.com/samson/products/mixers/mpl-mixers/mpl1204/).

I have spares, and repairing them is a bother. I pull one out, send it to the repair shop, put a spare in. It doesn't happen that often, but it's getting more frequent, and I don't want it to fail on the gig. I lost one channel, and I have one unused channel. That was a close call.

So something new is in order.

There is no small 12 compact mixer that I can find that has 12 true channels. Both the "Alesis MultiMix 12R Rackmount Mixer" and the "Behringer Eurorack Pro RX1202FX Rackmount Mixer with Effects" are really 10 channel mixers with the last two channels stereo. The Behringer looks better because it has balanced outs, but I'll be short one channel with no spare.

So I thought of this solution. I have 4 synth modules that take up 4 channels in my mixer.

I'd like a passive way to mix the outputs of 4 mono synths (1/4" phone jacks/plugs) to one channel. I don't need volume, eq or anything like that. Just a way to mix them together without creating an impedance mismatch or anything else I may not know about.

Someone must make one. I'm searching sites but am having any luck. Perhaps I don't know what it's called.

Thanks.
Notes


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What you're looking for is called a line mixer. Whether one is your best choice will be determined by your total input needs at a gig. There are likely better solutions. what are your total inputs and outputs through your entire PA set up for a gig? Mics, line in's, Synths, Keyboards, etc.

But if you're sold on the 4 mono input to single output


Behringer Micromix MX400 Line Mixer

Last edited by Charlie Fogle; 03/17/19 10:39 AM.

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Thanks Charlie. It looks like it'll do the job.

Notes


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If you’re not summing to mono, and you keep everything at line level by using a small mixer, I can’t think of any other issue.


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I have this.
It has 8 inputs (which can be used as 4 stereos),
and it can be used with 9v battery.

https://www.musiciansfriend.com/pro-audio/nady-mm-242-4-channel-mini-mixer/630434000000000?cntry=us&source=3WWRWXGP&gclid=EAIaIQobChMIwonm54-O4QIVBozICh10oQDyEAQYAiABEgJbGPD_BwE

Obviously, not top of the line, but does the job.

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Thank you all for your help.

I found the schematics to build one with a project box, phone jacks, and 4.7k resistors. It took a couple of hours to build, and it works!

Notes


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Originally Posted By: Notes Norton
Thank you all for your help.

I found the schematics to build one with a project box, phone jacks, and 4.7k resistors. It took a couple of hours to build, and it works!

Notes


Glad you found one.

Short story.... in an earlier band..... we used a passive radio shack 4 ch mixer. It cost like $12 brand new and we plugged in several high impedance vocal mics to use in a very basic PA. It worked pretty well.... we finally got the money to get a real mixer.


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Originally Posted By: Notes Norton
Thank you all for your help.

I found the schematics to build one with a project box, phone jacks, and 4.7k resistors. It took a couple of hours to build, and it works!

Notes



If you take time to watch my BIAB Testimonial video, you'll see a slide of a Lafayette kit that was schematically the same mixer you constructed. That kit launched my lifelong home recording hobby.


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Originally Posted By: Notes Norton
I found the schematics to build one with a project box, phone jacks, and 4.7k resistors. It took a couple of hours to build, and it works!

That's cool Notes! I bought a 4 channel headphone amplifier kit about 10 years ago and soldered/wired that together. Was a fun project.




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Originally Posted By: Charlie Fogle
<...snip...>

If you take time to watch my BIAB Testimonial video, you'll see a slide of a Lafayette kit that was schematically the same mixer you constructed. That kit launched my lifelong home recording hobby.

Unfortunately watching anything is out of the question now. I live too far away from the end of the fiber optics, so when the weather is good, the best I can get is DSL lite, and when it is rainy and windy I can't watch anything because I don't have the patience to wait for the endless buffering.

March has been windy and rainy, which is unusual, it's usually the dry season. But nothing is like it used to be - climate change is definitely real around here.

It's the price for living in almost paradise.

There is a 15 mile stretch of road with a 2 mile wide lagoon to the east, a slim barrier island separates the lagoon from the Atlantic Ocean. To the west is a protected wetland/wildlife preserve. Most of the lots are more than 50 and up to 200 acres. The only side streets are fewer than a half dozen short dead-end spurs that owners subdivided before zoning in the 1940s. I live on a half acre lot on one of those spurs.

Because the lagoon is salt water there is a lot of corrosion on the cable. Because neither the telephone nor CATV cable passes many homes per mile, there isn't a return on their investment to upgrade or even maintain.

I have wired ATT Internet which is terribly slow. My neighbor has Comcast CATV and to him it seems it's out almost as much as it's on. I chose more reliability with slower speed.

I could go with satellite but with all the salt spray, and no guarantee of connection by the dish people, I decided to stay with the wired connection.

The good part...

I'm 32' above sea level, with a micro-climate, warmer in the winter and cooler in the summer. I get an occasional bobcat, sand-hill crane, gopher tortoise, fox, and other wildlife in my half acre, and because of the prevailing trade winds, the air is the cleanest in the lower 48. Plus, there is never frost on the ground, it never gets that cold.

Our little dead end street is very friendly, we all know each other, and we all watch out for each other. There is a true sense of community on our hill. And being 32' above sea level, we are the only spot in the county that doesn't need flood insurance. We're only about 10 minutes away from the rest of the town so everything we need is close by. When we come back, and pass the wetlands preserve, we know we are in the paradise zone.

So when the weather is either very windy or very rainy I don't do videos on the Internet. A small price to pay for a great place to live.

Notes


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I still can't get cable where I live. I'm 23 miles from the nearest Walmart. I've lived within a mile of where I stay now since 1968. I've lived in the same house located on the family farm since 1978 and in a mobile home on the same spot for three years prior to building my home. I bought the family farm that surrounds me years ago and I'm the fourth generation of our family to live here on the farm. In the surrounding woods (and oft times in my yard) are deer, turkey, bobcats, squirrels, rabbits, quail, mourning doves, ducks, red fox, grey fox, coyotes, opossums, raccoons wild pigs and on very rare occasion, bear. I've never actually seen one but one was killed here on the farm in 1954 and one was spotted out on the highway about two years ago. And the year before that a friend hit one on the highway.

The farm grows cotton, rye, wheat, soybeans, corn and tobacco. There are four different varieties of grape vines, pear trees, an apple tree, a peach tree, fig trees and pecan trees.


I had one of the first satellite systems in the area back in the 1980's and tried Hughes net years ago. Now I have DirecTV and Netflix on my iPhone.


We're far enough inland to avoid the salt spray and the tourist traffic.

There are two ponds within walking distance of the house stocked with fish by the neighbors that own them. I live just a few miles from two rivers that are marvelous for fishing and boating and canoeing.


And generators, I have generators. I have generators because we are always the last road in the county to get lights back on after a storm or hurricane. We don't have gas lines out this way so I have a large farm/industrial propane tank that's just about 400 gallons for my tankless gas water heater, gas logs and gas stove/oven. I'm on deep well water and have a dedicated generator to run the water pump and other ones tied into the house wiring.


For entertainment, we set on our large front porch and watch traffic not go by....


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Originally Posted By: Charlie Fogle

For entertainment, we set on our large front porch and watch traffic not go by....
I enjoyed that line, Charlie. Lucky you.


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Originally Posted By: Charlie Fogle
<...snip...>And generators, I have generators. I have generators because we are always the last road in the county to get lights back on after a storm or hurricane. <...>

We need generators as well (I have two).

When hurricanes visit our state they take down the power grid. The electric company restores the power to the greatest number of people in the shortest amount of time. It's the right thing to do for two reasons (1) it gets the most people back in service and (2) for the power company it gets the most meters spinning - they don't make money if the meters aren't spinning.

Because we live in a low density area, along the coast where the power lines get the brunt of the storm, and with big lots and almost no side streets the power company passes the fewest homes per mile of cable, we are the last to get restored. After a 'cane we are typically without power for 10 days.

In 2004 we had 2 'canes and a tropical storm. We bought a lot of gasoline that year wink

But I prepare for the storms. The good thing about hurricanes is that you know they are coming. Stock non-perishable food, draw and store plenty of drinking water from the well, fill garbage cans with water for flushing, put the storm shutters up, pick up loose debris in the yard, and fill plenty of gas cans to feed the generators.

I've been through quite a few of these storms, and thankfully never had to rely on a government hand out.

Your farm sounds great for people who like that kind of thing. The idea of lots of land around me sounds good, but being away from the ocean does not.

Notes


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Originally Posted By: Notes Norton
In 2004 we had 2 'canes and a tropical storm. We bought a lot of gasoline that year wink

I've been through quite a few of these storms, and thankfully never had to rely on a government hand out.

Your farm sounds great for people who like that kind of thing. The idea of lots of land around me sounds good, but being away from the ocean does not.

Notes



My local area has been completely devastated by 3 floods since 2015. Both nearby towns have less than 50 residents unaffected, less than 5 churches remain and less than 10 businesses have reopened. My place was slightly affected in 2016 due to the huge quantity of rain and the farm ditching couldn't handle the runoff quickly enough for a few hours but we are far enough from the rivers the actual flooding hasn't been a factor. No government assistance needed here or insurance either. I've given some thought to converting the generators over to LP and run them off the big tank or more likely draw off the tank to fill 20 lb tanks as needed.


On a sad note, two people were in a vehicle that was swept away by rushing water that had washed out the roadway and drowned just a few miles from my home back in October. In that same storm, a friend of more than 30 years and his wife were killed by fumes from a generator placed too close to the interior of their home. I know several families that lost their entire homes and belongings in both the floods of 2016 and 2018.


Regarding being close to the ocean, it's all perspective. I'm as close to the ocean as I am to Walmart...




Last edited by Charlie Fogle; 03/22/19 02:01 AM.

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Yes, unfortunately nature can be deadly.

Living in Florida for most of my life, when I decided to buy a house, I chose high ground (for Florida). The Eastern Sand Ridge. This minimizes the danger of a storm. I also would never live in one of those 2x4 frame houses that the developers bribed commissioners to let them build here. The pre-1970 building codes were the best.

The wind is a problem in hurricanes but the water is a bigger problem, and these people from 'up north' who were conned by unscrupulous developers to buy homes in what was formerly a swamp have the most problems. Folks on the barrier island have a problem with storm surge, as much as I'd love to live on the island, I know better.

And yes, being either close to the ocean or far from 'civilization' is a matter of perspective. I like the ocean. I lived near Lake Huron and Lake Superior for a while, but it wasn't the same.

I like getting out to the country, where population is sparse or even the closest thing we have left we could call wilderness, but I always want to live by mother ocean. This year I spent some time in the Australian Outback in a camper van and really enjoyed it.

In Florida we have both, they are a few miles apart in distance but worlds apart in lifestyle. In the east it's a boating culture, in the west, ranching. I like visiting my ranch friends, but I like living where I can smell the salt water.

The selection of music changes as to where we play too. Out west it's more country, near the beach more Caribbean. It's nice to be able to put on different musical 'hats' and express myself in different ways.

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Well as a follow up, I decided to keep repairing the Samsons, and pack my 4 channel passive mixer in the spare parts case. That way if a couple of channels fail, I'll be able to combine for synths into one, and save the gig.

I put 3 in the shop. Mostly bad solder joints. I suppose it's from doing one-nighters; extreme temperature changes and vibrating in the rack almost daily. One had a worn fader (I bought that one used so who knows how it was treated).

I talked to the repairman, and he said they are basically very good units, and with no computer components, would be serviceable for years to come. Most of the parts can be replaced with common off-the-shelf parts, and they would probably give me more life than a newer unit with custom components.

So now I have 4 up and running and another in my studio that I can use in an emergency. They don't fail often, the last time I had one in the shop was 2003. I've had three fail since then and it worked out to less than $20/year to keep them running.

Not a bad deal, I spend much more than that on reeds and guitar strings.

Insights and incites by Notes


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