Flex Your PCD Mettle:

[jzagaja]

Re: Flex Your PCD Mettle:

New player in the game - dipolar snap-in waveguide for AMT. Watch Joachim Gerhard work on G-poles.

[Starkiller4299]

Re: Flex Your PCD Mettle:

Ok, sorry to get a teensy bit off topic, but now that I've installed a new W7 compatible DVD drive, and then Windows Office, which has allowed me to run PCD...

I'm having a wee bit of trouble generating a .zma with the response modeler portion. Attached is a screenshot of the spreadsheet 'in action'. I would appreciate it if anyone could give me a bonk on the head and let me know what I'm screwing up. Thanks!

In the meantime I'll just need to play with the tweeter :p.

[bruson]

Re: Flex Your PCD Mettle:

OT: I'm flexing my HolmIpulse mettle (or lack thereof) below.

My son is going to help me get PCD up and going sometime soon.

Speaker: SUB (2-15" Clamshell design), MID (B&C 10PS26) and TWEET (B&C DE250)

All together @ 2M:



SUB alone @ 2M:


MID alone @ 2M:


TWEET alone @2M:


MID and TWEET @ 2M:


I have lots of reflections and comb filtering going on in my echo chamber of a room.

Taking measurements at 1M and 1 foot look better with many fewer suck outs and peaks.

Subjectively it sounds really good with all the many imperfections.
When I listen up close at about 2 feet the sound is very smooth.

Lots of work to do to improve it.

Any comments?

[Skywave-Rider]

Re: Flex Your PCD Mettle:

bruson,
Have you tried inverting the polarity on the sub and measured?

I think that would be useful to A/B but at or near the listening position. Don't know if that is 2m.

I think it looks pretty good so far for a real world listening room.

[bruson]

Re: Flex Your PCD Mettle:

bruson,
Have you tried inverting the polarity on the sub and measured?

I think that would be useful to A/B but at or near the listening position. Don't know if that is 2m.

I think it looks pretty good so far for a real world listening room.

Sub reverse polarity:


Normal Polarity:


All from my sitting position about 9 feet away.

With a simple polarity change, without touching the mic a lot of things changed.
I'm using the Dayton EMM6 mic and a Behringer Xenyx 502 pre.
Are they that sensitive?
I noticed when I move the mc 1/2 inch to an 1 inch lots of big changes happen. It can make my measurements lot OK or terrible.

Is there a better way?

[Zilch]

Re: Flex Your PCD Mettle:

ONE speaker at a time, unless the mic is precisely (within 1/8") on the acoustic center between them.

Are you doing that?

[bruson]

Re: Flex Your PCD Mettle:

ONE speaker at a time, unless the mic is precisely (within 1/8") on the acoustic center between them.

Are you doing that?

I am using only one speaker at a time. And the sub. No change except for the polarity on the sub.

Wild disparities happened multiple times at different measurements. Sometimes a huge midrange suck out, sometimes the tweeter rolled off steeply at 5K. Wacky. Or my inexperience is showing. Maybe something is intermittent and I haven't tracked it down yet. So I show the good readings not the great readings, too unbelievable. I also don't show the really fantasy crappy readings. I hope I figure it out soon.

My sub FR may look a little goosed because with 2 main speakers playing I think they add about 3db to all frequencies above 100hz. I may end up with reversed polarity when I go back to 2 main speakers so it adds a bit more bass for taste.

[KLR]

Re: Flex Your PCD Mettle:

Hey Zilch,

Has anyone used the Eminence Beta 12LTA?

Thanks.

[Skywave-Rider]

Re: Flex Your PCD Mettle:

If you can't replicate the results, excepting maybe for very LF when a truck rumbles by, then you have issues. I had that problem measuring in SoundEasy. So I gave up on that and went with different measuring software. If you don't change anything, and you're getting variable results, you might have some software problems as I did, or maybe intermittent switching in your system.
PS, get behind the mic and don't move around when measuring. : )

I am using only one speaker at a time. And the sub. No change except for the polarity on the sub.

Wild disparities happened multiple times at different measurements. Sometimes a huge midrange suck out, sometimes the tweeter rolled off steeply at 5K. Wacky. Or my inexperience is showing. Maybe something is intermittent and I haven't tracked it down yet. So I show the good readings not the great readings, too unbelievable. I also don't show the really fantasy crappy readings. I hope I figure it out soon.



My sub FR may look a little goosed because with 2 main speakers playing I think they add about 3db to all frequencies above 100hz. I may end up with reversed polarity when I go back to 2 main speakers so it adds a bit more bass for taste.

[bwaslo]

Re: Flex Your PCD Mettle:

Particularly if you're using a laptop, try disabling the Wifi and Bluetooth adaptors in it. The drivers in some of them can cause all sorts of interference and stuttering in audio streams.

[LouC]

Re: Flex Your PCD Mettle:

Will this thread never die? The horse is dead, it's bones are fossilized...

[rudyjakubin]

Re: Flex Your PCD Mettle:

Will this thread never die? The horse is dead, it's bones are fossilized...

Not Yet! I wanna see how the views column handles 100,00...:p

[Skywave-Rider]

Re: Flex Your PCD Mettle:

Great thread.

[bruson]

Re: Flex Your PCD Mettle:

Skywave-Rider:

If you can't replicate the results, excepting maybe for very LF when a truck rumbles by, then you have issues. I had that problem measuring in SoundEasy. So I gave up on that and went with different measuring software. If you don't change anything, and you're getting variable results, you might have some software problems as I did, or maybe intermittent switching in your system.
PS, get behind the mic and don't move around when measuring. : )

bwaslo:
Particularly if you're using a laptop, try disabling the Wifi and Bluetooth adaptors in it. The drivers in some of them can cause all sorts of interference and stuttering in audio streams.
::::::::::::::::::::::::::::::::::::::::::::::::

I learned not to move around except to move my finger to click the mouse!
Still got highly variable readings.

So I think the software idea and bwaslo's idea of disabling things will be tried next.

I think I had too many other programs running at the same time. I'll try just Holmimpulse alone and see if I get better results.

Thanks!

Also played around with one third octave smoothing and my FR looks good enough for marketing purposes! What a joke.

[Zilch]

Re: Flex Your PCD Mettle:

Not Yet! I wanna see how the views column handles 100,000...:p

We are pikers here; the main thread on AK is pushing a million views for its third anniversary. :D

Will this thread never die? The horse is dead, it's bones are fossilized....

Congratulations!! You scored Post #1001 -- thank you for your contribution. ;)

This thread is alive and well; hundreds of DIYers all over the world are designing and building EconoWaves according to the precepts documented here. Its role as a reference resource is reflected in the view count.

[There are at least three Mini-Ewaves that'll be migrating into "prime time" here shortly.... ]