REW + Home Theater Setup Mic
Printed From: Speakerplans.com
Category: General
Forum Name: Electro Frying Forum
Forum Description: Talk about drivers, processors and mixers
URL: https://forum.speakerplans.com/forum_posts.asp?TID=101433
Printed Date: 26 March 2026 at 11:31pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: REW + Home Theater Setup Mic
Posted By: 120hz
Subject: REW + Home Theater Setup Mic
Date Posted: 04 March 2018 at 9:16pm
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Anyone know if a HT mic would be suitable for taking measurements with you know like the one you get with a Yamaha AV receiver?, I have been using the laptops built in mic but I get the impression it might be a little bit dodgy... Also would anyone be interested in the graphs if the HT mic is more accurate, I have 2 Cubo 18 loaded with 18lw24000, 2 Cubo 18 loaded with QTX 450w rms drivers (not actually too bad) and 2 Cubo 15 kick loaded with some eminence beta I think? Wonder how much of a difference spending £200.00 extra per driver can make at low to medium levels... |
Replies:
Posted By: Conanski
Date Posted: 04 March 2018 at 9:51pm
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120hz wrote:Posted By: bitSmasher
Date Posted: 05 March 2018 at 11:47am
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MiniDSP UMik - REW can upload the calibration file, runs on USB and is affordable. I've also plugged that mic in to an iPad and Samsung phone (via specific cables) and they both worked. ------------- https://www.instagram.com/batteryacidsoundsystem/ |
Posted By: bitSmasher
Date Posted: 05 March 2018 at 11:49am
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Also just re-read the question and I have used a similar mic with a laptop - they will put a few volts phantom on the mic input ------------- https://www.instagram.com/batteryacidsoundsystem/ |
Posted By: 120hz
Date Posted: 05 March 2018 at 1:04pm
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Regarding the phantom volts will this skew the measurements, is there anything I can do to help with the accuracy, perform sweeps at a higher spl for example? I just don't really want to buy a measurement microphone when I could put the money towards another amplifier  Edit: the mic only has a mono 3.5mm jack on it anyway so if it did need power how would I provide it? |
Posted By: MattStolton
Date Posted: 05 March 2018 at 4:09pm
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The danger is that the mic doesn't have a flat response. Your AV amp will have the mics response built in as a correction to any measurement (at least I hope it would!), so any rise or fall in the mics pick-up, will be offset by some corrective EQ in the amp mic input. They may well have engineereed it to have a drop in response at certain frequencies, so when the AV amp "corrects" the speaker output, it may add some form of designed "smiley face" type EQ, to "sweeten" the sound. Very expensive mics will either be flat (ish) or include a measured response, so you can tell your measuring system what the mic does, so the system subtracts that to give a flat pickup response. A mic that comes for free with a £400 AV amp will not be flat? Still worth a try, as better than nothing, but will not be flat out of the box. Perhaps a scour of the internet may reveal a generic response plot for that mic, but yours may be at the extreme of tolerance of manufacture. Without testing cert, which is money, you will not know. Most laptop "mic" sockets will provide some small VDC to phantom power electret pickups in headsets, usually around 5V DC across Tip or Ring, relative to screen. ------------- Matt Stolton - Technical Director (!!!) - http://www.wildingsound.co.uk" rel="nofollow - Wilding Sound Ltd "Sparkius metiretur vestra" - "Meter Your Mains" |
Posted By: 120hz
Date Posted: 07 March 2018 at 10:08pm
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Ok I think I understand, I will try to do some proper testing tomorrow, just from messing about the mic does seem to be very quiet and does not pick up the sweeps quite how it should. So far this has just been fixed by doing the sweeps a little louder much to my neighbors annoyance. There are no markings at all on the mic, all I know is that it came with a Denon receiver I bought a couple of years ago which isn't much help. PS what's everyone's opinions on Bi-amping, I have some completely unbranded debadged speakers that seem to sound pretty good, the crossover however looks like it's the weak point, just worried it might go bang. The tops are driven off a 4 channel 250w p/ch amp bridged into 2 channels. Thanks |