dipole stereo bass?

[AJinFLA]

AJ,
You may want to go back and look at the frequency response graph again. The outputs are pretty much equal down to 20Hz. The first vertical black line is the cursor in the steps mesaurment program set at 14.3Hz, not the 20Hz graticule line.

Gary, there is no need for me to. What you mean to say is the frequency response, as measured at a finite mic position is pretty much equal down to 20Hz. I don't see where you have posted the measured power response of both systems - these are very low frequencies, which will be "felt" as much as "heard", and can easily influence subjective results. The total acoustic power radiated is what I need to see. How you are determining "equal outputs", I do not know.

Yes, you can feel the difference between the 2 sub systems at the very bottom of the frequency range but it is a subtle difference at best.

That must be eliminated before any valid comparison.

My preference for the damped u baffle over the un-damped u baffle and h baffle has more to do with the perceived improvement in control and detail in the presentation of the music. This effect is much greater than the small increase in very low frequency output the damped u baffle has.

I don't doubt the first part for a second. What you did was make one subwoofer system sound better than another - in your room.
I would probably have prefered it too under those circumstances.
But that's as far a conclusion as you can make. And I only focused on radiated power. There are many more variables. No generalizations can be made (not that you were making any, just for the thread viewers). Just those particular, unequal systems, in that room.
I could do a similar "listening test" in my room where everyone prefers the undamped H-frame. It would prove very little also.
If you don't believe me, just read John K's response again. He's saying the same thing.
I don't know where JohninCR is getting "dismissed" from. I'm simply pointing out what I see. Your methods are vastly superior to anyone who takes no measurements. That is the domain of the dreamer.
I glad you took the time and effort to do all of this and if you are happy with the sound that resulted, enjoy some music! 😉

Cheers,

AJ

 

[johninCR]

Your methods are vastly superior to anyone who takes no measurements. That is the domain of the dreamer.

AJ,

That's an absurd statement. Gary couldn't have gotten to where he is without the same primary tools I use (ears and brain), yet he could have easily gotten there without pulling out the mic. In my book, the superior method is the one that produces results in the most efficient manner. Gary went the extra mile only to be critiqued by you.

If you haven't figured out yet that all OB's need to be tuned, in some form, to the room and placement for optimum placement, then you didn't understand the gist of JohnK's comment. That's the beauty of OB...they're so easily tuneable.

My speculation is that the damping reduced panel vibration, resulting in better sound. I am, however, intrigued by the reduced phase shift with damping. I've been planning a pair of U-subs and will start with an extremely solid heavy cab, then play around with damping.

 

[chops]

You guys are waisting your time arguing with AJ.

He is a "know-it-all", (at least he thinks so) and will always try to get the last word in. With AJ, nobody can ever be right about anything except for him.

Save your time and energy and do what I do... Just look right past his posts and completely ignore him.

 

[Kensai]

Thanks, John. I hadn't really considered any of these configurations would effect the directivity of my FRs. I was just thinking of them in conventional terms where a bicone driver has a pretty decent off-axis response, generally. I can see now how there would be a few problems just with that. I don't think I want to get involved trying to engineer out issues with resonances and whatnot.

Kensai