Knowing it will take me a while to get into RePhase etc i decided to tinker with some room treatment experiments.
When I say tinker, I mean I have 4off 150mm High density Rockwool panels 1200mm x 600mm which I made for a different room and different set up.
So, I carried these across and did 3 series of experiments, which as I write about them I see could have been done more consistently!
Diffuser also in place
Series 1, No EQ add panels to the front wall.
Series 2, with my current EQ move some panels to the back wall.
Series 3 Look at the first right side reflection, NB the left side is about 2m of open space.
I looked at them with various smoothing applied and found heavy smoothing to be revealing about the trends.
I did some L+R, some L or R but the trends are similar.
Series 1
2 panels low on the wall didn’t do much really.
4 panels covering more of the wall higher up started to lower some peaks by a few Db after 80Hz and may be worthwhile and caused some dips at 600-800Hz. Don’t worry about the props, i didn’t want a catastrophe!
In both cases the effect at higher frequencies above 1000-1500 Hz seemed small.
Lower panels only above
4 panels results above
Series 2
Moving some panels behind the listening position reduced some peaks by a few DB from 150 Hz upwards.
Series 3
I put two panels on the Right side of the right speaker, in a position that wouldn’t be practical but I wanted to measure the effect, forgot to take that picture it seems but imagine the radiator and window and wall next to the speaker covered up by the panels used previously.
This took a bite out of peaks at 250Hz plus.
In review, nothing i did touches anything below 80Hz – i have elsewhere, used MLV in combination to some better effect lower down.
It may be practical, with the approval of management (!) to treat the front wall by building a shelf for the equipment below the TV and covering the whole wall to the depth of the TV (150mm) which would mahe the TV appear flush and tidy lots of things………..wiring behind the wall etc
The rear wall treatment would have to be very clever and good to gain approval
The RHS could combine with the front wall project, but would be thinner and less extensive than my experiment.
If i made some combination of this lot would it be worthwhile?????
I noted WesaySo saying room treatment might have taken some life out of things, we don’t want to do that!
M
When I say tinker, I mean I have 4off 150mm High density Rockwool panels 1200mm x 600mm which I made for a different room and different set up.
So, I carried these across and did 3 series of experiments, which as I write about them I see could have been done more consistently!
Diffuser also in place
Series 1, No EQ add panels to the front wall.
Series 2, with my current EQ move some panels to the back wall.
Series 3 Look at the first right side reflection, NB the left side is about 2m of open space.
I looked at them with various smoothing applied and found heavy smoothing to be revealing about the trends.
I did some L+R, some L or R but the trends are similar.
Series 1
2 panels low on the wall didn’t do much really.
4 panels covering more of the wall higher up started to lower some peaks by a few Db after 80Hz and may be worthwhile and caused some dips at 600-800Hz. Don’t worry about the props, i didn’t want a catastrophe!
In both cases the effect at higher frequencies above 1000-1500 Hz seemed small.
Lower panels only above
4 panels results above
Series 2
Moving some panels behind the listening position reduced some peaks by a few DB from 150 Hz upwards.
Series 3
I put two panels on the Right side of the right speaker, in a position that wouldn’t be practical but I wanted to measure the effect, forgot to take that picture it seems but imagine the radiator and window and wall next to the speaker covered up by the panels used previously.
This took a bite out of peaks at 250Hz plus.
In review, nothing i did touches anything below 80Hz – i have elsewhere, used MLV in combination to some better effect lower down.
It may be practical, with the approval of management (!) to treat the front wall by building a shelf for the equipment below the TV and covering the whole wall to the depth of the TV (150mm) which would mahe the TV appear flush and tidy lots of things………..wiring behind the wall etc
The rear wall treatment would have to be very clever and good to gain approval
The RHS could combine with the front wall project, but would be thinner and less extensive than my experiment.
If i made some combination of this lot would it be worthwhile?????
I noted WesaySo saying room treatment might have taken some life out of things, we don’t want to do that!
M
So question for the resident expert on arrays if you don't mind......i'm getting all sorts of negative feedback that appears to based off of simulations in that my plan of using 32 3/4 dome tweeters in a vertical array with a CTC spacing of 1.5" is going to have a poor vertical response?.......i can't see how this would be the case if i cross them at 3.5K or so, Your thoughts?
PS My original plan was to use the GRS 8" slim planar tweeter ( 8 of em) that can be crossed much lower using that many....likely 800hz.......and same thing........simulations show very poor vertical response. Thoughts?
PS My original plan was to use the GRS 8" slim planar tweeter ( 8 of em) that can be crossed much lower using that many....likely 800hz.......and same thing........simulations show very poor vertical response. Thoughts?
That loss of liveliness was when I put that panel up behind the listener. That changed a lot perception wise, while everything became more clear I also felt I lost that excitement arrays can bring. I had about the same basic situation like you, wall on one side, open on the other side. That's why I first treated the side with that wall, it seems less easy for you to do that?
I treated that wall to get it more in line with the open side. Easier to view on an impulse response viewing the first ~10 ms.
What stands out is that 2 of the 3 experiments have a broad frequency spectrum where it works according to the graphs posted. Treating he front wall where the speakers are doesn't show a similar broad improvement. I noticed something similar in my own room and decided against any treatment of that wall, it wouldn't have been practical anyway as there's a window on one side.
From those two scenario's (2 and 3) where there is a wide range of frequencies that show a change in SPL over a wide frequency range, that change should show in the IR too. Probably showing less high peaks after the main pulse. If you know what peak belongs to what wall you're beginning to learn/read your room. Knowing what does what can be beneficial.
I do recall @nc535 running several simulations with planar tweeters and separate tweeters too if I recall it correctly. Been browsing that thread and didn't find what I was looking for:
Here's a planar simulation: https://www.diyaudio.com/community/...-corner-placement.337956/page-38#post-6486878
What were the poor results? A very small/narrow vertical coverage window? As that is what it looks like in the linked post.
There isn't much that Jack didn't simulate I'd say. 😀 Hope he chimes in.
I have 16 of the ND20 FB's already.....i'm just gonna make a quick line and see how it actually behaves.......you managed to get 3.5" drivers to work together.......i can't see how .75" wouldn't ...........the horizontal off axis of these is pretty impressive to say the least
The 'narrow' vertical response is the thing we want in this case to git rid of floor/ceiling reflections.
The array basically does not have a narrow vertical angle , its more a parallel beam with height of the array so no problem at all.
These directivity plots are very misleading to give results in degrees in this case.
I agree......line array theory and concepts have been applied for decades now.........i absolutely questioned the sim showing a 20 degree vertical window........unless that window begins at the top and bottom of the line.....in this case around 50"
……..but not from the vertical center of the array?…….i didn’t think I misunderstood that part
Neh, just a render: https://www.vandermill-audio.nl/checking-simulation-vs-reality/ 😀
We replaced this with new plasterboard.
We replaced this with new plasterboard.
A free plugin to spice up a mix: https://philspeiser.com/product/the_spice/
No idea what it does yet (except make it louder when testing it with the basic settings). I don't need it but it might be fun to play with.
No idea what it does yet (except make it louder when testing it with the basic settings). I don't need it but it might be fun to play with.
Missed it too!
Sad news indeed. His presence in the audio world and in this forum will be missed.
Sad news indeed. His presence in the audio world and in this forum will be missed.
This came as a fun surprise yesterday:
In light of our King's birthday (which is today) Arjen Anthony Lucassen was granted the title of Knight, a perfect fit for him I'd say!
For those that never heard of him, he's the man behind Ayreon among other projects and was once the guitar player of the Dutch rock band Vengeance.
If you grew up on 80's rock, you'll have to try this album (if only once):
That album (among others) still is in heavy rotation here on my towers. I'll attend a live concert of Ayreon later this year together with my son.
https://www.arjenlucassen.com/live/
Arjen has a lot of albums up on Youtube, so check em out if you like the above.
In light of our King's birthday (which is today) Arjen Anthony Lucassen was granted the title of Knight, a perfect fit for him I'd say!
For those that never heard of him, he's the man behind Ayreon among other projects and was once the guitar player of the Dutch rock band Vengeance.
If you grew up on 80's rock, you'll have to try this album (if only once):
That album (among others) still is in heavy rotation here on my towers. I'll attend a live concert of Ayreon later this year together with my son.
https://www.arjenlucassen.com/live/
Arjen has a lot of albums up on Youtube, so check em out if you like the above.