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 Post subject: Re: My room measurements
PostPosted: Mon Sep 11, 2017 12:15 pm 
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Joined: Wed Jun 18, 2014 11:04 am
Posts: 202
Location: Chicoutimi, QC, CA
Today I wanted to see if the flexi rack between my speakers was doing good or bad thing, so I removed it and filled it back, taking measurements between major changes.

Attachment:
setup.jpg
setup.jpg [ 70.52 KiB | Viewed 179 times ]


1/6 smoothing
Purple - before removing everything, so my measurement from the last week
Gold - without rack - amplifier and dac on the floor
Green - Everything back

Attachment:
Sept - Comp rack.jpg
Sept - Comp rack.jpg [ 51.57 KiB | Viewed 179 times ]


Here's the details

1/6 smoothing
Purple - old
Gold - no rack
Light green - Empty rack
Red - Rack with amp, CD player
Black - all LP added
Pink - CD added
Blue - Everythoing back to normal with TT on top

Attachment:
Sept comp rack filling.jpg
Sept comp rack filling.jpg [ 40.72 KiB | Viewed 179 times ]


Here's the impule response

Blue - With rack
Gold - Without rack

Attachment:
Sept - comp rack impulse.jpg
Sept - comp rack impulse.jpg [ 54.01 KiB | Viewed 179 times ]


There's a reflexion at 1,12ms just a little bit over 20 db (22,1db), I won't sacrifice the frequency response for a small relflexion like this. Maybe I can just move the rack a little bit but, filled It won't move, I'll need help. The spike spike at 13 ms is a rear reflexion, I removed some bean bags and cushions behind the sweet spot, but It can be easily corrected with wall treatment. A simple cotton towel can do it, but I'll try to find something with a high WAF, because it can be seen when we enter the house. Maybe I'll install drap and remove them when not listening to music.

In conclusion I'll keep the big rack between the speakers. Maybe If I moved the speakers again I would have manage to correct things a little bit, but my setup is tune and I also need a place to store all my CD and LP and keep it convinient.

I think that the rack, lp, and CD act as a ''baffle extention'', what's your thought about this?

There's still a small dip at 70 hz I'll try to get some rigid mineral wool panels to see what can be done.


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 Post subject: Re: My room measurements
PostPosted: Wed Sep 13, 2017 11:28 am 
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Joined: Wed Jun 18, 2014 11:04 am
Posts: 202
Location: Chicoutimi, QC, CA
Fixing the rear reflexion.

I installed a curtain rod I put a blanket on it. It's removable so wife will stays happy.

Impulse - both speakers - before
You can see the nasty peak/reflexion at 13,8 ms?
Attachment:
Sept - comp rack impulse.jpg
Sept - comp rack impulse.jpg [ 54.01 KiB | Viewed 157 times ]


Impulse both speakers with blanket on wall
No more peaks/reflexions
Note that I placed the microphone differently on that one, the peak is still below 20 db though with the previons setting. I placed the microphone the reproduce if I just sit more comfortably.
Attachment:
Sept 13 Impulse deux porte fermée.jpg
Sept 13 Impulse deux porte fermée.jpg [ 56.09 KiB | Viewed 157 times ]


Impulse left speaker - No nasty peaks
Attachment:
Sept 13 Impulse gauche.jpg
Sept 13 Impulse gauche.jpg [ 56.43 KiB | Viewed 157 times ]


Impulse right - still looks good
Attachment:
Sept 13 impulse droit.jpg
Sept 13 impulse droit.jpg [ 56.68 KiB | Viewed 157 times ]


Let's look at the freqency response - again it takes only few inches to modify your measurements and what you hear.

1/6 smoothing
Green = Sitting perfectly square
Pink = Sitting more comfortably a couple of inches below
Gold = Tried to close the door to the right again - the response looks good now!
Blue = just for fun - I placed the micro where my head is when I lie down on the couch (and fall asleep)
Attachment:
sept 13 1-6 smooth.jpg
sept 13 1-6 smooth.jpg [ 55.65 KiB | Viewed 157 times ]


Bass - no smoothing
Attachment:
Sept 13 no smooth.jpg
Sept 13 no smooth.jpg [ 53.25 KiB | Viewed 157 times ]


So no more reflexions here, I did add convoluted foam matress top (1 inch) at first reflexion points on left and right walls, there were no big reflexions, below 20db, but now it's almost perfect. The next step will be to make this look pretty, but since I don't have money to invest it will wait.

The next thing that still bother me is the dip between 63,8 hz to 71 hz, - 5 db. I need to think about a solution I know it's coming from the right speaker.


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 Post subject: Re: My room measurements
PostPosted: Fri Sep 22, 2017 10:29 am 
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Joined: Wed Jun 18, 2014 11:04 am
Posts: 202
Location: Chicoutimi, QC, CA
Investigating my 1khz to 2khz dip.

I placed the microphone as deep as my setup allowed me in the horn, as well as just outside.

The dip seems to be present here too. I guess I'll have to investigate with the crossover (800hz), but I don't have an active crossover so I'll live with it for now!

Purple : left speaker
Green : right speaker
Gold : right speaker outside horn
Attachment:
600hz up close up.jpg
600hz up close up.jpg [ 49.96 KiB | Viewed 125 times ]

Attachment:
600 - 20khz.jpg
600 - 20khz.jpg [ 56.82 KiB | Viewed 125 times ]

Attachment:
600 ooutside horn.jpg
600 ooutside horn.jpg [ 56.58 KiB | Viewed 125 times ]


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 Post subject: Re: My room measurements
PostPosted: Fri Sep 22, 2017 11:27 am 
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Joined: Mon Apr 26, 2004 2:33 pm
Posts: 3095
Location: Toronto, ON, CA
I'm wondering how you're using TAD TN-4 crossovers with single bass drivers, since the TN-4 is explicitly designed to use dual woofers
(not entirely idle curiosity, since I've got TL-1601b, TD-4002, TN-4 and the Arai 290 Hz horns).


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 Post subject: Re: My room measurements
PostPosted: Fri Sep 22, 2017 11:33 am 
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Joined: Wed Jun 18, 2014 11:04 am
Posts: 202
Location: Chicoutimi, QC, CA
It's supposed to work good with both configuration

Attachment:
DSC04289 (1).jpg
DSC04289 (1).jpg [ 93.24 KiB | Viewed 112 times ]


I did not have any issue so far

-- 22 Sep 2017 15:42 --

I choose this crossover because of it's dual purpose. I want to upgrade to dual woofer if it's room necessary in the futur.


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