Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

Interface for Room EQ Wizard
Interface for Room EQ Wizard
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th June 2018, 07:07 PM   #1
CharlieM is offline CharlieM  United States
diyAudio Member
 
CharlieM's Avatar
 
Join Date: Feb 2008
Location: Savannah, GA
Default Interface for Room EQ Wizard

Hi all,
I want to start using Room EQ Wizard for speaker tuning and room compensation. I already have a Behringer ECM800 microphone, 50 mic cable, and a DEQ2496 EQ. What I need is an interface (phantom power supply for the mic) and a cable to connect it to my Mackbook. Can anyone recommend an inexpensive solution?
  Reply With Quote
Old 13th June 2018, 07:11 PM   #2
lisoformio is offline lisoformio  Italy
diyAudio Member
 
lisoformio's Avatar
 
Join Date: May 2008
Location: near Florence
BEHRINGER PS400 MicroPower
  Reply With Quote
Old 13th June 2018, 09:17 PM   #3
WrineX is offline WrineX  Netherlands
diyAudio Member
 
WrineX's Avatar
 
Join Date: Mar 2004
Location: Den Haag
digidesign Mbox 2 or mbox2 mini, both can be had second hand for next to nothing
  Reply With Quote
Old 14th June 2018, 11:41 AM   #4
Mike Beck is offline Mike Beck  United States
diyAudio Member
 
Join Date: Aug 2005
Location: North Carolina
I use a Rolls MP13. It has phantom power, a preamp, and xlr + unbalanced line outputs.
  Reply With Quote
Old 14th June 2018, 01:41 PM   #5
CharlieM is offline CharlieM  United States
diyAudio Member
 
CharlieM's Avatar
 
Join Date: Feb 2008
Location: Savannah, GA
I ordered a Beheinger PS 400 and an xlr to USB cable from Sweetwater last night-- that should do it
  Reply With Quote
Old 14th June 2018, 07:48 PM   #6
bentoronto is offline bentoronto  Canada
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Interface for Room EQ Wizard
When it comes to gadgets I couldn't live without.....

Behringer second-hand mic mixer, with of few channels, of course, when I faced the same question.

Yes, has power supply but also lets you control volumes (with LED display of course) or at least see the levels in and out.

A lot more flexible and with a lot more controls and benefits than a USB mic just plugged into a USB port or the PS400. All measurements I make of this unit are as clean as could be.

Well, at least other readers might benefit from this late post.*

B.
*big storm in Toronto yesterday, trees breaking power lines
__________________
HiFi aspirations since 1957. Currently working on motional feedback again... the final frontier in audio (also, see recent post with data on a 17-foot labyrinth sub)
  Reply With Quote
Old 14th June 2018, 07:55 PM   #7
bentoronto is offline bentoronto  Canada
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Interface for Room EQ Wizard
Tuning, a large part of my life. Mostly fun but always immensely informative.

Some hints:

get a mic tripod

any one spot will look terrible, so learn to use the REW FR averaging tool for say three runs and stick to 1/12 smoothing consistently

256 speed is as slow as you need to go

if you are running both L and R speakers together, you will find freq when they subtract (you do this by using a fixed mic location and comparing L, R, and both) - if major holes appear, move speakers to equal ear distance (with big panels to set, I use a safety pin holding the end of a long string to my listening chair and then measure to the four front corners of each of the panels.... this is important even if you have to make a stand for the panels to tilt them)


I'm sure others will have hints to add.

B.
__________________
HiFi aspirations since 1957. Currently working on motional feedback again... the final frontier in audio (also, see recent post with data on a 17-foot labyrinth sub)

Last edited by bentoronto; 14th June 2018 at 07:59 PM.
  Reply With Quote
Old 20th June 2018, 06:51 PM   #8
CharlieM is offline CharlieM  United States
diyAudio Member
 
CharlieM's Avatar
 
Join Date: Feb 2008
Location: Savannah, GA
Now I'm confused:

So I purchased a PS400 phantom power supply and an XLR-to-USB cable with the intent to use my ECM800 mic for REW measurements.

However, I've been reading the REW setup guide (on the Nirvana Forum) and it states that using an ECM8000 with REW requires a preamp/power supply (whereas, the PS400 is only a power supply). The setup guide also states that any USB mic can be just plugged in to a USB port on MacBook with no preamp required, and that would eliminate the need to calibrate [an external] sound card.

So my question is: Why is a Beheringher ECM800 with a PS400 power supply and USB adapter cable is NOT equivalent to a "USB mic" in the REW setup guide? What's the difference? Can I use the ECM8000/PS400/MacBook setup for REW
or not?
  Reply With Quote
Old 20th June 2018, 08:45 PM   #9
krivium is offline krivium  France
diyAudio Member
 
Join Date: Oct 2009
An analog condenser or electret microphone (ecm8000) do need phantom power supply to polarize the capsule(in case of condenser microphone, electret is already polarized) and feeding the internal headamplifier/"preamplifier" ( which is an impedance converter sometimes with a bit of gain, but it main purpose is to convert the megohms impedance of the capsule to hundred(s) of ohms or so as most of theconnections in pro world are of the bridge type -low out z to high input z, in microphone this is usually a ratio of 1 to 5, sometimes much higher at 1 to 100).
The headamplifier output a tiny signal which need to be amplified by a preamplifier (which give mainly voltage gain this time) to work at reference level of the next stage (e.g.: in a console it can be an eq or fader, for external standalone preamplifier it could be a converter a/d).

So without a preamplifier you ll have signal but it ll be to low to be usable (it will be "corrupted" by noisefloor).

In an usb mic, the converter is placed just after the headamp/preamp of the mic (in the mic body itself)and his reference level is adapted to the tiny signal the headamp produce so you shouldnt be bothered with noise issues.

An inexpensive solution could be to diy a simple battery powered preamplifier to feed the analog input (pro line level, +4dbu) of your deq2496 and then use digital out to enter in your computer ( if you have a digital input in your macpro).
This can cost you maybe 10$ in components and a perfboard.
This one will work well:
The famous $5 preamp - everything you need to know
You just skip the phantom related parts and insert your ps400 between the mic and the preamp xlr input.

If you don t have a digital input in your computer Wrinex solution (mbox2) is the cheapest solution... but your ps400 will have zero use as redundant.

Last edited by krivium; 20th June 2018 at 09:06 PM.
  Reply With Quote
Old 21st June 2018, 02:05 AM   #10
CharlieM is offline CharlieM  United States
diyAudio Member
 
CharlieM's Avatar
 
Join Date: Feb 2008
Location: Savannah, GA
Thanks Krivium,
I didn't quite follow everything you said (electronically challenged) but I got the gist of it.

I think I'll just by a mic preamp and be done with it.
  Reply With Quote

Reply


Interface for Room EQ WizardHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Room EQ Wizard on Ubuntu Deafuser Software Tools 6 22nd June 2017 04:20 PM
Room EQ Wizard software btntx Room Acoustics & Mods 1 7th September 2014 12:19 AM
Determine F and Q through with Room EQ Wizard charliecola Subwoofers 11 4th May 2014 10:44 PM
room eq wizard for minidsp with 2x8 board parb miniDSP 4 5th April 2012 03:27 PM
Room EQ Wizard download not working ashok Everything Else 0 9th June 2008 07:31 AM


New To Site? Need Help?

All times are GMT. The time now is 01:08 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki