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Measurements - what to do next
- Thread starter brk
- Start date
ernestcarl
Major Contributor
Depending on distance, it may have been better to compare with a PIR or estimated in-room response curve — of course, the link you gave did not have them anyway.
BTW, there’s a really handy tool in VituixCAD to trace SPL from plot images. Same one I use most of the time… Not a lot of effort is required to learn how to use that specific tool.
ernestcarl
Major Contributor
No, the Q is not particularly high there, but the negative and positive gain may be a bit more than I would use myself.
I was correcting for the speaker’s anechoic response honestly.
ernestcarl
Major Contributor
There is quite a bit of a difference between the measurements and the average that was attached.
- Thread Starter
- #27
Thanks everyone. Ppataki - I cannot find the right measurements so will have to re-do. If you send me the correction for the left I should be able to easily adapt. You can see the current EQ strategy I chose on that first graph - with sharp reductions around 44 and 62. Will try a broad filter from 100-300 hz to see how it sounds.
Hi @brk
Please see below the link the mdat file - you will see two filters there + the convolution of those that results in the final filter that if you convolve (A*B operation in Trace arithmetic) with the original measurement you will see the same response that I posted above
I hope this helps, please let me know once you tried it how it sounds
Please see below the link the mdat file - you will see two filters there + the convolution of those that results in the final filter that if you convolve (A*B operation in Trace arithmetic) with the original measurement you will see the same response that I posted above
I hope this helps, please let me know once you tried it how it sounds
holbob
Senior Member
have you tried pointing the speakers straight ahead rather than just at your ears? May bring some of the high frequencies down a bit.
- Thread Starter
- #30
Thank you for the file. I see that you use multiple high Q filters to get the response- are the "rules" about avoiding steep filters beyond the bass region and staying away from areas of high phase shift just recommendations? Also, you EQ to a flat frequency response - as this is at the listening position should I be creating some slope in the response?
ernestcarl
Major Contributor
Just keep in mind: Although you can linearize the FR with convolution, this really does not change the speaker’s directivity and the room’s reflection decay characteristic. The former is baked in the design while the latter can be improved by physical adjustments like acoustic room treatment. Non-flat or relatively even reflection decay pattern will add its own coloration the sound that you hear despite achieving a “flat” looking FR curve.
Well, there are 'rules' and there is your ears - I suggest listening to it and then you can judge for yourself
Yes, forgot to mention that you shall apply a high shelf to tame the highs and a low shelf to increase the lows on top of the filters that I sent
Also you can consider a high-pass filter if needed to get rid of frequencies that would overload the drivers
Hipper
Addicted to Fun and Learning
Unless there's some major fault with your speakers or input you should be able to make quite big alterations by positioning.
Can I just make sure I understand how your speakers are positioned.
In your first post you say that they are set up on the long wall. I take that to mean that the wall behind the speakers (normally called the front wall) is 22'. They are 2' forward of the front wall and also 10' from your listening position (LP). They are therefore 12' from the back wall. In a later post you say that they are 6 feet apart. which means they are 8' from each side wall. Is this correct? Let's assume it is. Your LP is therefore about 2.5' from the back wall (using Pythagoras!).
One positioning idea is The Thirds. This would locate the inner front edge of your speakers 7'4" from the side walls and 4'8" from the front wall with your LP (specifically your ears) 4'8" from the rear wall. That makes the speakers about 7'4" apart and your distance from ear to one speaker just under 6' (more Pythagoras). It might look silly but it's worth a try. If it's too silly or impractical for you, you could try The Fifths.
http://www.barrydiamentaudio.com/monitoring.htm
The coffee table is probably not good - it will reflect sound upwards. Test that by removing it. Generally you should have no obstructions between you and the speaker. Leather chairs may also reflect more than fabric ones. Also I found that having equipment on the front wall - amp etc, or a screen - will also impact what you hear at the LP. I don't have a screen but put my gear on the side wall (it needs longer speaker cables but this also reduces irritations from LED lights).
- Thread Starter
- #34
Thanks! I rechecked the numbers and found a mistake. Here are the true dimensions:
The room is 19 x 13 feet with the speakers set up on the long (19 foot) wall. Their outside edges are 70 inches from the side walls. Their backs are 22-24 inches from the back wall - 22 for the outside edge and 24 for the inside edge due to toe in. They are 6 feet apart tweeter to tweeter. I sit 9 feet from the mid-point - the back wall is 18 inches behind my head.
I tried measuring just the left speaker at a range of distances from 12-40 inches from the back wall. At about 36 inches out, the dip gets a little smaller but that is too far out into the room. Have not tried varying the side wall distance mostly because a tweeter-tweeter distance of 6 feet apart seems to provide optimal imaging. Gear is on side wall as you mention.
The rule of thirds will not be practical. Will see about fifths. Thanks,
The room is 19 x 13 feet with the speakers set up on the long (19 foot) wall. Their outside edges are 70 inches from the side walls. Their backs are 22-24 inches from the back wall - 22 for the outside edge and 24 for the inside edge due to toe in. They are 6 feet apart tweeter to tweeter. I sit 9 feet from the mid-point - the back wall is 18 inches behind my head.
I tried measuring just the left speaker at a range of distances from 12-40 inches from the back wall. At about 36 inches out, the dip gets a little smaller but that is too far out into the room. Have not tried varying the side wall distance mostly because a tweeter-tweeter distance of 6 feet apart seems to provide optimal imaging. Gear is on side wall as you mention.
The rule of thirds will not be practical. Will see about fifths. Thanks,
I used 2 of those thick heavy office divider panels behind my head. @ 6 feet high and 6 feet wide with 2 of the panels they are a bit obvious but you could put tapestry over them or a large picture. They can be expensive as new but they do work and come in varying sizes and shapes. If you are on a budget and don't mind buying them used then scope out auctions where they sell for way less than a new price.
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