maybe you are referring to the +1khz response and not the bass? In my previous smallish untreated room I had annoying results in the highs. That's where the distance from the walls really play a role I feel..
@Markus, thanks for clarifying, I am not that big! 🙂
@markus76
I am trying to do the same measurements as you did.... but I have nothing but bad luck here. First I had to replace the power supply on my CLIO computer...it was dead. Good thing I have spares, this computer is 20 years old. And now it seems like the harddrive is defective... again. I can do the measurements, and they confirm my claims, but I can't save them. This is embarrassing, I know
I am trying to do the same measurements as you did.... but I have nothing but bad luck here. First I had to replace the power supply on my CLIO computer...it was dead. Good thing I have spares, this computer is 20 years old. And now it seems like the harddrive is defective... again. I can do the measurements, and they confirm my claims, but I can't save them. This is embarrassing, I know
And even more embarrassing is this: Turned out that the harddrive was full.... how on earth did I manage to fill that drive? I mean, it large... it's 100 MB !!
😱😱😱😱😱😱😱😱😱😱😱
😱😱😱😱😱😱😱😱😱😱😱
USB on a 20 year old ISA-bus 486-machine running MS-DOS 6.0? That would be cool.... 😎
haha thats nothing. we (me at work) still test and measure sub transient reactance current waveforms using a VHS 386 at up to 128khz! Great machines. We had the same battle trying to switch from floppy to USB.
Last edited:
The only problem with that old stuff is to get spare parts. And why change it if it works and gets the job done?
OK, have the measurements. First a little about the room, speakers and measurement points.
Here is the room layout. I have four H-baffle woofers, placed as shown below. The listening distance is very short, only 1,5 meters. At the rear end of the room there is a diffractal diffusor.
The nine measurement points are all done 1 meter above the floor, spread out in a 100 by 50 cm square around the main listening position.
There is no room EQ on the measurements.
All are done with MLS in Clio, 160 ms time window, and there is no smoothing at all.
Here is the room layout. I have four H-baffle woofers, placed as shown below. The listening distance is very short, only 1,5 meters. At the rear end of the room there is a diffractal diffusor.
An externally hosted image should be here but it was not working when we last tested it.
The nine measurement points are all done 1 meter above the floor, spread out in a 100 by 50 cm square around the main listening position.
There is no room EQ on the measurements.
All are done with MLS in Clio, 160 ms time window, and there is no smoothing at all.
Here are all nine measurement together.
What happens at the positions that are farthest from the center, is that the Left and Right woofers starts to cancel each other because of the phase difference. This is seen above 100 Hz.
Also note that this is the woofers only, with crossover at 200 Hz.
What happens at the positions that are farthest from the center, is that the Left and Right woofers starts to cancel each other because of the phase difference. This is seen above 100 Hz.
Also note that this is the woofers only, with crossover at 200 Hz.
An externally hosted image should be here but it was not working when we last tested it.
And here's a comparison between left and right channel, taken in the main listening position.
As you can see, there are small deviations above 100 Hz, probably caused by the fact that the room is not entirely symmetrical, and I was also present in the room when it was measured, which do affect the result.
As you can see, there are small deviations above 100 Hz, probably caused by the fact that the room is not entirely symmetrical, and I was also present in the room when it was measured, which do affect the result.
An externally hosted image should be here but it was not working when we last tested it.
thanks, but I feel Markus won't be happy.. 🙄
1hz precision he asked for!😉
I realize we actually have a very similar speaker placement, I thought your subs were much closer to the corners, and far away from the mains, hence my question a few days ago about the audibility of the localization at 200hz..
1hz precision he asked for!😉
I realize we actually have a very similar speaker placement, I thought your subs were much closer to the corners, and far away from the mains, hence my question a few days ago about the audibility of the localization at 200hz..
Thanks fir these but could you use a larger window to increase resolution? Such a short window works basically like smoothing 😉 I've used 1000ms in my graphs.
Could you also please use the same zoom I did (60dB range, 15-200Hz)?
I did have monopole subwoofers a few years ago. It was impossible to find a position where the response was anywhere near how the dipoles measure. I don't have those subwoofers anymore, but I replaced one with my bass guitar cabinet, a Seas L26ROY in large vented box, and placed in the same locations as the old subwoofers I had. And this is how it measures. No crossover or EQ here.
An externally hosted image should be here but it was not working when we last tested it.
CLIO does not support that. Sorry.
But I did do one sinewave measurement with 1/48 octave resolution. It looked smoother in fact, so the MLS reveals more detail.
Last edited:
Its also interesting to look at the decay. First the monopole, where the room decay is long and high in level. Next the dipole, where the decay is lower in level.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
