Audio Pro Addon T14 Spinorama measurements

[Ageve]

Would you mind to try these to confirm they are OK?

Yes, now it works.

I did a quick multitone test today:

~3% distortion at 730 Hz - 1.7 kHz.

It matches the problem areas in the 1m on-axis and near-field measurements:

 

[pseudoid]

Thank you, @Ageve,
It would have interesting to see a poll at the top of your great post.

The walls are made of 8 mm MDF (0.3 inches), and the bottom wall for the port looks like it's masonite or something. Very thin.

As for the added bracing - it sure looks like it killed some resonances. Goes to show why all the DIY folk are so hot on them.

I guess if the design was based on 8mm MDF to begin with, results show that bracing is not doing much where this enclosure really needs it.

 

[Crosstalk]

Here's a teardown.

The walls are made of 8 mm MDF (0.3 inches), and the bottom wall for the port looks like it's masonite or something. Very thin.

The crossover would make Danny Richie happy though. No sand cast resistors. In fact, no resistors at all. Even better, I guess?


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I did a quick bodge-job, and added some bracing + replaced the damping material just to see if it would make any difference. It's obviously not a permanent solution, and it wouldn't even fit in the powered speaker.


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It smoothed out the peaks, and the highest one is reduced by almost 3 dB, but the overall level is about the same.

The woofer response is almost identical (maybe a little smoother):

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Finally, I plugged the port. It didn't do anything to the woofer response > 200 Hz:


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edit: I'm listening to it now, and it actually made a noticable difference.

The bass is less muddy and "resonant". Maybe it's just my imagination, but still.

That tweeter is really cheaply made. But I am surprised to see good parts in the crossover. Is there a cap in series to the tweeter ? Or just an inductor in parallel? Both caps seems to be of very high values for tweeters. Also try knocking on the walls of the speaker, and see where you hear the most “ringing”. The braces attached to the other sides of those points makes the most difference. There will be always some “hot spots” on the cabin, where the resonance is more than the other.