NatP inroom measured

[bbcmp1979]

Ok, so I finally got my measurement up and here's my inroom FR for the NatP w/ 1/6smoothing.


I forgot to mentioned that this is measured with the rs28f vs the original design which called for a rs28a. The rs28f does have a rising response on the top end.

I turned it up pretty loud and even with the rising response of the rs28f, it wasn't fatiguing at all (atleast to my ear anyway.) :-)

So I remeasured it with a pillow under the mic and here it is.

[bbcmp1979]

reserve

[---k---]

Can you tell us more about your measurement setup? Are you using a calibrated mic? Is this one speaker or both? Is this 1m on axis or at your seat? Is this a gated measurement?

Other than the big rise in the top, it looks pretty good. But, that rise seems a bit much. It is more than just the difference between the a and f.

[bbcmp1979]

---k---
The mic used is an emm6 mic with a cal file loaded but my soundcard isn't calibrated, and I measured it at 2ft last night on axis. What happened is i brought out an old aiwa stereo as my amp and the treb is turned on. I remeasured it this morning w/ the treb off at 3ft and 3ft away from walls/windows.

[wkhanna]

Now that looks like the NatP I know & love!

[bbcmp1979]

SInce the mic was set up already, I went ahead and measured the 2cc from JED.



2cc vs natp

[fbov]

Did you measure in the same room, same location? It's curious that the bass response is so different, given it's dominated by the room, and is covered by the same driver in both cases... Perhaps it's orientation; the 2CC is a horizontal design while NatP's are vertical?

HAve fun,
Frank

[bbcmp1979]

They are both measured in the same room, but not the same location. The Natp is sitting right next to the window, and the 2cc sitting on the top shelf underneath the tv. Basically, I measured them where they are sitting in my room. I rather see what I'm hearing at the current location and figured that the dips/peaks are due to room mode. Eventually I'll try and move them to a location where room mode won't effect them as much.

the dips at 150hz for the natp is definitely room mode
here's an earlier measurement where i had it out in the middle of the living room
but the 1khz peak is due to the mic being sitting on a chair vs sitting on a pillow

[JonP]

Yep... Everything below 200-300hz is going to be strongly affected by room, with a far field measurement. Moving things around as you're doing can help to see what is room mode effects and what's basic response of the box. Of course, a near field measurement kinda does that too...

But you can learn a bit about positioning vs flatness at the listening position, and maybe thereby choose a better final spot in the room for the speakers. Especially with that nice, compare multiple graph feature in REW...

Reflective things near (both in front and behind) the mic can do things to the higher end as well, might be an idea to look around for a basic mic stand to keep that part cleaner.