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Search: Posts Made By: Okv
Forum: Subwoofers, Bass, and Transducers   07-22-2015, 11:51 AM
Replies: 3,636
Views: 119,832
Posted By Okv
Using accelerometers to measure cabinet vibration...

Using accelerometers to measure cabinet vibration is not new, we have been using various methods to analyze cabinets for decades.
Atkinson has published accelerometer vibration measurements in...
Forum: Subwoofers, Bass, and Transducers   07-21-2015, 01:07 PM
Replies: 3,636
Views: 119,832
Posted By Okv
No need to make it more difficult than necessary....

No need to make it more difficult than necessary.
The data presented here now shows something that is useful, you can compare the measurements and get an idea how it performs.

Yes, it will only...
Forum: Speakers   07-09-2015, 03:54 PM
Replies: 2,363
Views: 99,300
Posted By Okv
2K is quite high for a 15", and it is likely that...

2K is quite high for a 15", and it is likely that it does not behave like a piston source so high up.
But now it looks like they are going to measure it, so then you will find out.
Forum: Speakers   07-09-2015, 02:02 PM
Replies: 2,363
Views: 99,300
Posted By Okv
It is a completely new design, not released yet,...

It is a completely new design, not released yet, but you can find a presentation for it on my web-site with frequency response charts.

A flat on-axis is just one of the design criteria, and only...
Forum: Speakers   07-08-2015, 09:34 PM
Replies: 2,363
Views: 99,300
Posted By Okv
That is quite impressive, it is very close to...

That is quite impressive, it is very close to being just as flat as my new center!

Try this - i.e. measure in-room at 1m - with any speaker that does not have controlled directivity, it will not...
Forum: Subwoofers, Bass, and Transducers   07-07-2015, 12:18 PM
Replies: 3,636
Views: 119,832
Posted By Okv
I don't have any knowledge on this app, but I...

I don't have any knowledge on this app, but I assume it presents vibration level in the frequency domain, similar to what REW does in the RTA.
Forum: Subwoofers, Bass, and Transducers   07-06-2015, 02:01 PM
Replies: 3,636
Views: 119,832
Posted By Okv
This is the important part. Try listening...

This is the important part.

Try listening to a 20Hz sine on headphones.
Can you hear it - yes, may be, but it doesn't necessarily give a pleasant experience, it is just pressure on the ears,...
Forum: Subwoofers, Bass, and Transducers   07-06-2015, 01:52 PM
Replies: 3,636
Views: 119,832
Posted By Okv
Assume you mean PSD-charts presented for the...

Assume you mean PSD-charts presented for the vibration measurements.

It is always nice to have a presentation that shows response as a function of frequency.
But to make sense they must compare...
Forum: Subwoofers, Bass, and Transducers   07-05-2015, 11:05 AM
Replies: 3,636
Views: 119,832
Posted By Okv
Interesting that you find the lower 15hz more...

Interesting that you find the lower 15hz more powerful than higher frequencies.
Forum: Subwoofers, Bass, and Transducers   07-05-2015, 11:01 AM
Replies: 3,636
Views: 119,832
Posted By Okv
Exactly. But you do not need a sound...

Exactly.

But you do not need a sound intensity meter, if you measure particle velocity that will give most of the information needed, and practical experiments show good correlation between...
Forum: Subwoofers, Bass, and Transducers   07-04-2015, 10:04 AM
Replies: 3,636
Views: 119,832
Posted By Okv
Sometimes it is necessary to experience something...

Sometimes it is necessary to experience something to realize that established theories have been simplified too much to explain the whole picture.

Changing the delay on rear or front will affect...
Forum: Subwoofers, Bass, and Transducers   07-03-2015, 06:18 PM
Replies: 3,636
Views: 119,832
Posted By Okv
If you place an accelerometer on furniture or on...

If you place an accelerometer on furniture or on the floor, you do not measure sound intensity, you measure mechanical vibration.
This mechanical vibration is a result of the sound waves acting on...
Forum: AVS Forum Podcasts   06-29-2015, 03:00 PM
Replies: 184
Views: 4,779
Posted By Okv
From this review I read that I would prefer the...

From this review I read that I would prefer the theatrical.

But this single example of a theatrical - near-field is not typical of what they do on a near-field, according to the mixers who have...
Forum: AVS Forum Podcasts   06-29-2015, 01:23 PM
Replies: 184
Views: 4,779
Posted By Okv
Just wanted to point out that the number I gave...

Just wanted to point out that the number I gave for dialogue spl is valid only for comparison to the other movie I measured using the exact same measurement procedure, as the spl reading depend on...
Forum: AVS Forum Podcasts   06-29-2015, 01:16 PM
Replies: 184
Views: 4,779
Posted By Okv
Very interesting. This is quite contrary to...

Very interesting.
This is quite contrary to what FilmMixer says.
Is it possible that different producers and studios have different approaches for making a near-field?
Forum: AVS Forum Podcasts   06-29-2015, 01:12 PM
Replies: 184
Views: 4,779
Posted By Okv
I said earlier "I suspect the problem is not...

I said earlier "I suspect the problem is not limited to the near-field mix", and from what you are saying here, you confirm that the problems I pointed out for those movies are indeed not caused by...
Forum: AVS Forum Podcasts   06-28-2015, 01:43 PM
Replies: 184
Views: 4,779
Posted By Okv
I have noticed you participate in conversations...

I have noticed you participate in conversations on avs, I appreciate your comments coming from the production side and thank you for that, and also noticed that some of your movies - nearfield or not...
Forum: AVS Forum Podcasts   06-27-2015, 02:53 PM
Replies: 184
Views: 4,779
Posted By Okv
Today I measured spl during playback from an old...

Today I measured spl during playback from an old movie (1999) compared to a new one.
Turns out peak levels are the same, but rms is much louder on the new one.
Subjectively, and confirmed by the...
Forum: Speakers   06-26-2015, 01:35 PM
Replies: 24
Views: 481
Posted By Okv
And this is why different brands and models sound...

And this is why different brands and models sound different - they are made according to different criteria.

Some brands are more laid-back with a nice and smooth sound, others are made to sound...
Forum: Speakers   06-25-2015, 05:38 PM
Replies: 24
Views: 481
Posted By Okv
If they measure identical they sound identical. ...

If they measure identical they sound identical.

The problem is that it is very complex to measure all aspects of the sound, and it is also a complex process to analyze and quantify all the...
Forum: AVS Forum Podcasts   06-24-2015, 05:41 PM
Replies: 184
Views: 4,779
Posted By Okv
Indeed my memory was very wrong, Brian Vessa...

Indeed my memory was very wrong, Brian Vessa talks about why they use -10dB listening level for near-field, the -20dB number comes from where he talks about how -20dB was supposed to be 85dB...
Forum: AVS Forum Podcasts   06-24-2015, 02:56 PM
Replies: 184
Views: 4,779
Posted By Okv
Early in the video, I don't remember the exact...

Early in the video, I don't remember the exact wording, but he (Brian Vessa) started out with stating that something like -10dB would be a "better" playback volume level, and then goes on about the...
Forum: AVS Forum Podcasts   06-24-2015, 01:13 PM
Replies: 184
Views: 4,779
Posted By Okv
You lost me..

You lost me at the "..with todays LOUD movies we use -20dB" on this one.

This is a big fail, and I don't mean the technical details in the mix process, the fail is you do not recognize your...
Forum: Audio Theory, Setup, and Chat   06-20-2015, 09:04 PM
Replies: 43
Views: 902
Posted By Okv
I am an engineer and ronny31 is right.

I am an engineer and ronny31 is right.
Forum: DIY Speakers and Subs   04-03-2015, 05:45 PM
Replies: 362
  HzHorn
Views: 11,410
Posted By Okv
I find this interesting. It matches up with...

I find this interesting.

It matches up with my own experiences with bass horns, more or less.
They do sound different, also at lower volume.
More life-like, more punchy without being bloated,...
Showing results 1 to 25 of 237

 
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