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#1 |
diyAudio Member
Join Date: Jan 2003
Location: Mumbai, India
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I have been struggling with a Behringer 302USB for speaker measurements, and I decided I badly need help from you guys.
(I have done speaker measurements, both impedance and SPL, in the past, using Speaker Workshop, an old Creative Soundblaster sound card, an impedance jig and a Panasonic mic capsule. So I know the basics, to the extent needed for that set of components.) I got myself a calibrated Dayton XLR mic through Cross Spectrum Labs, so I needed a USB audio interface with an XLR input, so I bought a Behringer 302USB. I now have doubts about whether it can be used at all. What I need (for impedance measurements) is the following:
I don't know whether the outbound signal and the inbound signal can be kept separate in the 302USB. It has something called a "Main Mix" which seems to mix all these signals internally. (Does it? Am I right? Is it controllable?)
Did I make an uncorrectable mistake by buying a mixer instead of a USB audio interface like a Creative Soundblaster or a Focusrite Scarlett? Do you recommend any USB audio interface instead of the Behringer which has an XLR mic input as well as unbalanced two-channel analog inputs and outputs, so that I can do both SPL measurement as well as hook up an impedance jig? Can any of you please help? Last edited by tcpip; 9th March 2014 at 05:44 PM. |
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#2 |
diyAudio Member
Join Date: Jun 2002
Location: USA, MN
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Does the 302USB have phantom power, because you need phantom power with that microphone? IS the 302USB also an external sound card, or just a preamp?
To make measurements you connect the left output of your sound card to the left input of the sound card - this is your reference channel. I use 1/8" male to male Left/right RCA jack adapters for output and input, and I use a female-female coupler to connect the left channels together.. You connect the right output of your soundcard to an amplifier, the amplifier to the speaker under test. You then connect the right input of your soundcard to the line out of your mixer (or whatever mic preamp you are using). Start making measurements with the gain all the way down on the mixer, and bring it up slowly until you get good signal to noise but no clipping.
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#3 |
diyAudio Member
Join Date: Jun 2002
Location: USA, MN
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I just looked and it seems to have phantom power. I think by its very nature (although I could be wrong) that thing is mainly an input device. and its input and outputs are not separable. You can still use it only on the input side for the right/left channels as I describe above, but you will need to use the soundcard and headphone/speaker out of your laptop to drive the amplifier that is used to drive the speaker under test.
__________________
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley |
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#4 | |
diyAudio Member
Join Date: May 2003
Location: Suomi
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Quote:
Hi, The divice is a mixer, that is what it does, mixes the input signals and puts them at the output. Everything you insert to the inputs will appear at the main mix output. So basically you cannot do a loop measuremt with that. If you loop output to the inputs you'll get feedback oscillation and that's bad. But have faith, you can make it work for loop measurement, but you'll propably have to modify the unit ![]() ![]() I did something similar for Alesis Multimix4 USB mixer. But it had plenty of other issues as well I needed to fix too http://dl.dropboxusercontent.com/u/2...AlesisMM4.html I believe Behringer is similar in functionality, so there should be hope. .
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#5 | ||
diyAudio Member
Join Date: Jan 2003
Location: Mumbai, India
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Quote:
In short, it is not advertised as a sound card, though I thought it can act as one. (Maybe it can.) It is a small mixer with USB connection (for power and audio), a mic input, and some line inputs and outputs. It has phantom power. There are extensive criticisms of its phantom power (or lack of it) on Amazon buyer reviews, but its phantom power is more than adequate for the Dayton measurement mic. Quote:
My questions are not really about how to do it -- my questions are "can it be done with a Behringer mixer like the 302USB?" ![]() |
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#6 | ||
diyAudio Member
Join Date: Jan 2003
Location: Mumbai, India
|
Quote:
![]() ![]() I will now have to (i) sell this mixer, and (ii) buy something else, probably much more expensive. I need something which will ideally do:
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#7 |
diyAudio Member
Join Date: Jan 2003
Location: Mumbai, India
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What USB audio interface would you recommend for speaker measurements?
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#8 |
diyAudio Member
Join Date: Aug 2007
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You may want to take a look at the Behringer UCA222 or UCA202. BEHRINGER: Computer Audio You might also want to give this a quick read about it as well. NwAvGuy: Behringer UCA202 Review
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#9 | |
diyAudio Member
Join Date: May 2003
Location: Suomi
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Quote:
This may be the key issue here. Does your measurement system software use one or two channels ? Why is it so, because I think one channel meaurement can be done with this Behringer without the internal mixer loop 'problem'. Say, for example, you output the measurement signal from main mix channel L, then insert mic and set the balance slider to R. This way main mix L output will not appear at R input, but the mic signal is available at channel R. It's worth to try at least ![]() .
__________________
Liberate yourself from the illusion of two speaker stereo triangle Dipole Bass vs Monopole Bass ![]() ![]() ![]() |
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#10 | ||
diyAudio Member
Join Date: Jan 2003
Location: Mumbai, India
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