DIY lspkr measurement mic

[Owen Y]

Gidday mark,

 

I got my Panasonic WM-61As from Mad About Sound a couple of yrs ago.... & I see they've still got them at similar price. At the time, I thought that their prices were easily the most attractive.

 

They've also still got PCBs for the Wallins Mic Preamp designed for lspkr measurements...

http://www.madaboutsound.com/prod_cat.asp?ctid=4&sa=cf

You'll see there also... Build Instructions & a 'Calibration File' for the DIY mic!

 

On this site you'll see a build guide for the 'Measurement Microphone' using the Panasonic capsules... (plus a bit of other interesting DIY lspkr stuff). Follow the link/s to Wallins' comments on other forums.

 

Keep us advised on progress!

[markc1553552739]

thanks for those links, i'll order a few of those mics and some of their fasteners - that's when they get back from holiday on the 31st

[valvemaniac]

I have a Behringer measurement mic and an M-Audio 2496 sound card at home. Can some-one recommend a good freeware or shareware software package for speaker analysis. (I'd be happy to also pay a reasonable amount for a good programme)

 

I'd love to be able to use the Clio system, but can't really justify spending that sort of money on something I would only use occasionally.

 

Thanks,

 

Steve.

[markc1553552739]

I've been playing with holmimpulse http://www.holmacoustics.com/holmimpulse.php it's free and seems good so... Kinda limited to frequency response / phase and distortion (how does it figure this out ?)

 

I was using the 15 day demo version of fuzzmeasure on my mac for impedance measurement, i'd love a free tool to do this if anyone knows of one.

 

I like my software to be easy to setup and use tho, I spend way too much time on the computer as it is

[Antipodes1553552706]

 

valvemaniac;101049 wrote:

I have a Behringer measurement mic and an M-Audio 2496 sound card at home. Can some-one recommend a good freeware or shareware software package for speaker analysis. (I'd be happy to also pay a reasonable amount for a good programme)

 

 

 

I'd love to be able to use the Clio system, but can't really justify spending that sort of money on something I would only use occasionally.

 

 

 

Thanks,

 

 

 

Steve.

 

I found TrueRTA worked fine for me www.trueaudio.com.

[valvemaniac]

 

Antipodes;101186 wrote:

I found TrueRTA worked fine for me

www.trueaudio.com

.

 

Hi Antipodes,

 

Yes, I have just downloaded the programme and paid for the upgrade to the 1/24th Octave setup. Seems to be very good so far, and has been a great help today in fiddling with the crossovers in the H6 clones

 

I tried the Holm Acoustics programme but for some strange reason it caused all sorts of problems with the soundcard and computer. Everytime I tried to run it the whole thing just crashed. Ended up having to un-install everything, go back to a restore point and start again. According to the trouble shooting guide in the sound card manual, the symptoms were indicative of an IRQ conflict, so I am sure it could have been resolved, but unfortunately I don't have the relevant skills to do dig that far into the computer workings.

 

The True Audio programme seems to do everything I need at the moment, so I'll stick with that while I save up for MLSSA

 

Cheers,

 

Steve.

[Nigel Beale]

Just bare in mind the top end can vary from unit to unit with cheap mics by a reasonable margion, in the region of +/-1.5~3db so you can chase your tail a little if hey don't agree with your ears. Remembering that amount of range can be a halving or doubling of of perceived volume.

They usually are reasonable down in the lower hz compared to calibrated reference mics.

 

That aside you can still measure and look for problems like holes and lumps in the freq response. We also have trouble hearing some room sound as we suppress alot of the extra reflective sounds in a room.