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Author Topic: Smaart 7 Hookup Question  (Read 5168 times)

Johnny Diaz

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Smaart 7 Hookup Question
« on: March 13, 2011, 01:31:47 pm »

Hello,

My name is Johnny and I'm been an avid lurker here on psw for sometime.  Have learned alot from reading threads and study hall.  I'm new to the sound reinforcement world.  I have downloaded and installed Smaart 7.  Im using a Mac along with the first USBPre and a Rane TTM57SL mixer.  The mixer has balanced xlr left + right outputs.  My question is on the hookup. 

I have two Mackie Powered speakers connected to the mixers xlr outputs.  From what I understand I'm supposed to use a y cable to split the signal on the mixers out to get a reference signal and connect that to the USBPre.  If I do this don't I lose the signal on that output by half?  The measurement signal goes from the USBPre to the USBPre.     

Thanks for your help
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Rob Spence

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Re: Smaart 7 Hookup Question
« Reply #1 on: March 13, 2011, 01:36:56 pm »

As a lurker you must have seen the mods require real names.
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Johnny Diaz

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Re: Smaart 7 Hookup Question
« Reply #2 on: March 13, 2011, 01:46:22 pm »

As a lurker you must have seen the mods require real names.

Sorry about that.
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Jay Barracato

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Re: Smaart 7 Hookup Question
« Reply #3 on: March 13, 2011, 01:54:07 pm »

Hello,

My name is Johnny and I'm been an avid lurker here on psw for sometime.  Have learned alot from reading threads and study hall.  I'm new to the sound reinforcement world.  I have downloaded and installed Smaart 7.  Im using a Mac along with the first USBPre and a Rane TTM57SL mixer.  The mixer has balanced xlr left + right outputs.  My question is on the hookup. 

I have two Mackie Powered speakers connected to the mixers xlr outputs.  From what I understand I'm supposed to use a y cable to split the signal on the mixers out to get a reference signal and connect that to the USBPre.  If I do this don't I lose the signal on that output by half?  The measurement signal goes from the USBPre to the USBPre.     

Thanks for your help

The powered speakers probably have a full range output on the back which is basically a split. you could pull your reference signal off of there.

Another option would be when you are measuring a single box use one side (L) for the reference and the other side R to drive the speaker.
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Jay Barracato

Johnny Diaz

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Re: Smaart 7 Hookup Question
« Reply #4 on: March 13, 2011, 02:01:24 pm »

The powered speakers probably have a full range output on the back which is basically a split. you could pull your reference signal off of there.

Another option would be when you are measuring a single box use one side (L) for the reference and the other side R to drive the speaker.

"Another option would be when you are measuring a single box use one side (L) for the reference and the other side R to drive the speaker."

If I were to do this wouldn't it affect the phase. From what I understand the Phase trace shows us how well 2 speakers sum up. If I use one output for reference I wouldn't get an accurate reading since only one speaker would be connected.  I'm using the system in stereo.
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Arthur Skudra

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Re: Smaart 7 Hookup Question
« Reply #5 on: March 13, 2011, 02:25:36 pm »

Hello,

My name is Johnny and I'm been an avid lurker here on psw for sometime.  Have learned alot from reading threads and study hall.  I'm new to the sound reinforcement world.  I have downloaded and installed Smaart 7.  Im using a Mac along with the first USBPre and a Rane TTM57SL mixer.  The mixer has balanced xlr left + right outputs.  My question is on the hookup. 

I have two Mackie Powered speakers connected to the mixers xlr outputs.  From what I understand I'm supposed to use a y cable to split the signal on the mixers out to get a reference signal and connect that to the USBPre.  If I do this don't I lose the signal on that output by half?  The measurement signal goes from the USBPre to the USBPre.     

Thanks for your help
I recommend you review the documentation that is available online at www.rationalacoustics.com, in particular, this multi page document:
http://www.rationalacoustics.com/pages/Measurement_Rigs

It really doesn't matter where you split the signal, whether at the output or input of the console, but you need to be careful in taking a mixing console output lest an eq is inserted somewhere in the path that influences your reference channel.  My preference is to use a simple RCA "Y" cable to take the RCA output from the USBPre, and feed that into input #2 on the USBPre.  Then plug a measurement mic into input #1 and measure away.

I highly recommend you attend a Smaart class.  Anyone can get a squiggly line to show up on your computer screen, but knowing how to interpret the data (or even knowing whether it's valid) is a completely different story.
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Johnny Diaz

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Re: Smaart 7 Hookup Question
« Reply #6 on: March 13, 2011, 02:40:16 pm »

I recommend you review the documentation that is available online at www.rationalacoustics.com, in particular, this multi page document:
http://www.rationalacoustics.com/pages/Measurement_Rigs

It really doesn't matter where you split the signal, whether at the output or input of the console, but you need to be careful in taking a mixing console output lest an eq is inserted somewhere in the path that influences your reference channel.  My preference is to use a simple RCA "Y" cable to take the RCA output from the USBPre, and feed that into input #2 on the USBPre.  Then plug a measurement mic into input #1 and measure away.

I highly recommend you attend a Smaart class.  Anyone can get a squiggly line to show up on your computer screen, but knowing how to interpret the data (or even knowing whether it's valid) is a completely different story.

"My preference is to use a simple RCA "Y" cable to take the RCA output from the USBPre, and feed that into input #2 on the USBPre.  Then plug a measurement mic into input #1 and measure away."

If I were to do this how would it compare the signal coming out of the mixer?

"I highly recommend you attend a Smaart class.  Anyone can get a squiggly line to show up on your computer screen, but knowing how to interpret the data (or even knowing whether it's valid) is a completely different story."

I would love to take a class but funds wont allow me.  I'm saving up to buy the smaart program.
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Arthur Skudra

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Re: Smaart 7 Hookup Question
« Reply #7 on: March 13, 2011, 02:46:57 pm »

"My preference is to use a simple RCA "Y" cable to take the RCA output from the USBPre, and feed that into input #2 on the USBPre.  Then plug a measurement mic into input #1 and measure away."

If I were to do this how would it compare the signal coming out of the mixer?

"I highly recommend you attend a Smaart class.  Anyone can get a squiggly line to show up on your computer screen, but knowing how to interpret the data (or even knowing whether it's valid) is a completely different story."

I would love to take a class but funds wont allow me.  I'm saving up to buy the smaart program.
You need a reference and a measurement channel.  Your reference channel is the un-eq'd signal.  In other words, it needs to the pure, unadulterated test signal you're using to measure the system with, hence the "Y" cable directly on the output of your signal generator.  Your measurement channel is whatever you're measuring the *change* happening to the system under test.  This could be the output of the mixer, eq, or a mic setup in a room.
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Johnny Diaz

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Re: Smaart 7 Hookup Question
« Reply #8 on: March 13, 2011, 02:51:51 pm »

You need a reference and a measurement channel.  Your reference channel is the un-eq'd signal.  In other words, it needs to the pure, unadulterated test signal you're using to measure the system with, hence the "Y" cable directly on the output of your signal generator.  Your measurement channel is whatever you're measuring the *change* happening to the system under test.  This could be the output of the mixer, eq, or a mic setup in a room.

Ok so I want to compare the signal coming out of mixer to the signal from the measurement mic.  Would I use a y cable from the output of the mixer? 
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Ben Malone

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Re: Smaart 7 Hookup Question
« Reply #9 on: March 13, 2011, 03:21:30 pm »

I have two Mackie Powered speakers connected to the mixers xlr outputs.  From what I understand I'm supposed to use a y cable to split the signal on the mixers out to get a reference signal and connect that to the USBPre.  If I do this don't I lose the signal on that output by half?  The measurement signal goes from the USBPre to the USBPre.     

Thanks for your help

The quick answer to your original question is no, you will not lose half the signal by splitting one of the mixer's outputs.
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ProSoundWeb Community

Re: Smaart 7 Hookup Question
« Reply #9 on: March 13, 2011, 03:21:30 pm »


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