[DTB300]

Audiotools is calibrated to use internal mikes for ipads/pods. 

Rising bass below 65Hz was confirmed as an "issue/problem" with the internal mic with Studio Six Digital.  They stated when IOS6 comes out, it should help address this issue.

[MaxCast]

I have read the 3GS had the best mic for audiotools.  The mic in the 4 was even more optimized for the voice range and not as accurate with audiotools.  When I get comfy with REW I will be comparing it to audiotools FFT app.  Nice to hear ios6 may help the situation.

[KeithR]

ok, folks- Here is the iPhone and iPad 2 graphs, respectively.  Not much difference:

[DTB300]

ok, folks- Here is the iPod and iPad graphs, respectively.

Which iPad version - 1, 2, 3?  Here is my initial graph.   The 250Hz NULL is a room mode.  As you can see I get a RISE from around 80 on down.  Other than the 250 Null, I am happy with the response and of course the sound.

Soon I will attempt to address the 250 Null with some room placement.  Trouble is I have VERY little room to move things around (speakers, seat, etc.).  Might be time to talk to Bryan and Glenn about the possibility of a Scopus Tuned Trap.  (Working with Bryan now....will post update later)

[*Scotty*]

KeithR and DBT300, StudioSix recommends that test signals should above 70dB to maximize the signal to noise ratio with an iPod/iPhone etc..
 DBT 300 the suckout you are measuring at 250Hz is most likely induced by floor bounce cancellation and will not yield to changing the speaker's location.
Scotty

[*Scotty*]

Deleted, stupid iPhone.

[DTB300]

DBT 300 the suckout you are measuring at 250Hz is most likely induced by floor bounce cancellation and will not yield to changing the speaker's location.

It is more room length/width modes along with seating position.  Height changes do not affect this null.

I will try a higher test signal to see if things change