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8338923 01-27-2015 02:44 PM

Bi-amped System Crossover Tweaking with TrueRTA
 
I’m a newbie to software like TrueRTA. The manual for my two-way active crossover says that though crossovers can and should be adjusted by ear, by also using a mic, preamp and software, one can generate graphics that will help get the task done a lot faster.

I can't upload what I want in a permissible format/size, so please see the summed FR and phase responses for the 3 pole filters on p. 8 here http://www.firstwatt.com/pdf/prod_b4_man.pdf . I refer to the 3 pole filters are for clarity. I’ll be hoping to get away with using 2 pole filters at most.

I need to learn how to measure and display the frequency response and phase response of the HP and LP filters-and their summed responses-of the chosen type, slope and Fc of the two crossovers.

Would someone here care to describe their own step by step procedure for doing this-presumably using TrueRTA’s dual trace oscilloscope and an omnidirectional mic and preamp?

bsnelson 03-14-2015 11:57 AM

Since this thread began 10 years ago (!), I'm seeking some "current state of the art" opinions.

What I want to do is spectrum analysis of my car audio system. I'm not wanting to do SPL. Looking over the the thread and other info, it seems like the Beringer ECM8000 mic is still a good choice, but I need the connection between it and the laptop that I'm going to use for TrueRTA. I look at some of the options on Amazon and I worry about the negative comments regarding sound quality, but I don't know how much these will affect what I'm trying to do.

This gear will be single purpose for me; I'm not looking to use it for anything else, so mixing, additional inputs and the like are not a factor. I'm not wanting to spend over $100 for the gear (assume that the mic, laptop and TrueRTA software are givens, not included in the spend total).

Thanks in advance for any and all advice.

Brad

Garidy 03-16-2015 06:14 PM

Quote:

Originally Posted by Brucemck2 (Post 6109148)
Ikka ... Thanks!!! Your user guide was very helpful.

To answer your mic question: I'm using a five year old calibrated mic that came with my GoldLine 1/12th (low) 1/3rd (elsewhere) RTA

Had to replace the M-Audio FastTrack with a MobilePre. Salesman that pitched the FastTrack said they were "identical, except FastTrack was single channel rather than two channel". He was right, IF you ignore the phantom power differences!

Oops!

Garidy 03-16-2015 06:15 PM

Excellent Investment made by the OP!

Thank you, very informative and useful...:)

Garidy 03-16-2015 06:22 PM

Quote:

Originally Posted by bsnelson (Post 32613681)
Since this thread began 10 years ago (!), I'm seeking some "current state of the art" opinions.

What I want to do is spectrum analysis of my car audio system. I'm not wanting to do SPL. Looking over the the thread and other info, it seems like the Beringer ECM8000 mic is still a good choice, but I need the connection between it and the laptop that I'm going to use for TrueRTA. I look at some of the options on Amazon and I worry about the negative comments regarding sound quality, but I don't know how much these will affect what I'm trying to do.

This gear will be single purpose for me; I'm not looking to use it for anything else, so mixing, additional inputs and the like are not a factor. I'm not wanting to spend over $100 for the gear (assume that the mic, laptop and TrueRTA software are givens, not included in the spend total).

Thanks in advance for any and all advice.

Brad

Hi Brad,

Check this out - I have used this with True RTA and the ECM8000... worked great!

http://www.emu.com/index.php/product-0404-usb-2-0-white

Very high quality!:) Lab grade in fact...

bsnelson 03-16-2015 08:06 PM

Hi Garity, not to sound ungrateful, but I believe this item runs afoul of the "not wanting to spend over $100" and "current state of the art" clauses of my post. :) The cheapest I can find is an eBay auction that's over $250, and it looks like a 8 year old device.

Brad

Garidy 03-18-2015 05:43 PM

Quote:

Originally Posted by bsnelson (Post 32679233)
Hi Garity, not to sound ungrateful, but I believe this item runs afoul of the "not wanting to spend over $100" and "current state of the art" clauses of my post. :) The cheapest I can find is an eBay auction that's over $250, and it looks like a 8 year old device.

Brad

My bad - sorry. When I bought mine about 8-years ago, it was $149.00, so I assumed it be under $100.00 used. Sorry to have wasted your time. If I still had mine i would sell it to you for $100.00 to make up for my misdirection.:o

BK104 11-30-2016 06:32 PM

Is this forum still alive?

Last post was in March of 2015 !

I want to find out what I need to set up True Audio's TrueRTA.
I understand I can use the
BEHRINGER ECM8000 mic and a PC with Windows XP.

Will a Lexicon Lambda USB interface be usable?

I am looking to start with the 1/6th octave
TrueRTA.

BK104 11-30-2016 06:51 PM

Quote:

Originally Posted by bsnelson (Post 32613681)
Since this thread began 10 years ago (!), I'm seeking some "current state of the art" opinions.

What I want to do is spectrum analysis...

...Thanks in advance for any and all advice.

Brad

Hi Brad,
Did you find something that works for you?
Bruce

BK104 12-01-2016 06:17 PM

Is this forum still alive?

A9X-308 12-01-2016 06:30 PM

Quote:

Originally Posted by BK104 (Post 48624721)
Is this forum still alive?

The forum is, but the thread is a zombie. You probably won't get much response as everyone uses REW. It's free and does a lot and there are a couple of help guides here too.


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