Hi efficient speaker, bass problems

Hello Tim,

I'm sure that speaker was not 97 or 99 db 1w/1m @ 30 hz or even 50 hz, very unlikely. Now put it in a 2 way system where it's bandwidth is as high as 500-700 hz, there is no way it will maintain that kind of sensitivity at 30 hz without somekind of EQ. compensation.

If you want to do it right and with low distortion it would require multiple bass drivers IMO, can it be done without , yes and draw the kind of comments mentioned by the OP...

Regards,

Hi Wes,
Well after I wrote, I searched my memory long and hard, You are correct, but absolutely wrong. I recall one was an Audax pro 15. 101 sensitivity, Fs was around 23, but qts was something like .2, we added a fair amount of mass which drove the fs down to around 19 or 20 and qms changed enough that qts was around .32... Sensitivity was still in the very high 90's. I'm not exact on numbers, but I'm not off by much. So, yes we modified the woofer, it wasn't stock, But your statement of "no way" it worked fine without eq compensation. I don't recall the exact model, but it was a PR380 series... Take a look, then say "ok way".
Tim

Take a look, then say "ok way". -Timlub

Huh? OK WAY... LOL...

Regards,

Tim,

"
AAC Acoustic Society Applications of Composites, now owns the brand Audax took over the manufacture of certain models. We will show you very soon on this site"

I might still have a few Audax manuals from way back when they used to supply us with drivers. I'm sure that model is listed, easy to model what you say ...

Interesting, 98-99 db output at 30 Hz/M/W and flat to 500 hz ?

Let me see if i can find those manuals....

regards,

Read what I said, Low 30's, High 90's.... I called my old partner, he recalled 3db down @ 34 & finished sensitivity of 98...
Also, if I recall, their were about 15 or twenty models in the PR380, resonances from 19 to 50 and final qts of .15 to .67, all had sensitivity of 97 to 103.
I assume the way you speak that you have had a fair amount of speaker manufacturing experience yourself, So What happens when you add mass to a driver?
Especially one with that motor structure.
By the way, the old Audax site still has archives, in french, but if you really feel the need to continue the challenge, they are there.