double 15 th with the 18 sound 15 nlw9401 4r

[epa]

hi oliver
only took close mic readings,as there was to much trafic on friday afternoon to make 10 mtr measurements.

 

[tb46]

Hi epa,

Still a lot better than no measurements. Thanks.

Regards,

 

[m R g S r]

I forgot about this thread. I really like these subs! How they working out?

 

[epa]

they are great special with the dsp sw
flat to 35 and then highpassed 192 db/oct
i forget making a pic of the finnised product.
friday i'll do that (if i don't forget)

the filter has been adjusted after i took this screeny

 

[epa]

whe have to glue the foam again.
we call that "kotsdoek" rougly translated "vomit-cloth"

 

[m R g S r]

Those look like they're a big name manufactured cabinet. Awesome work!

 

[tb46]

Hi epa,

A very professional product. Very well done!

Do you have enough room to turn one of the drivers around as in djk's PPSLs?

Regards,

 

[BP1Fanatic]

Awesome looking enclosure!

 

[NEO Dan]

Do you have enough room to turn one of the drivers around as in djk's PPSLs?

I was also wanting to ask this question for a different reason, I think it might make for an effective cone volume correction depending on how you modeled it. I know you said the horn appears short, but an error in expansion can also contribute to a weak low corner...

 

[epa]

tnx guys

oliver we did ,but no tests done.we found the sound better like this <>
time is scares but i wil do the driver flip in the future and post my findings/measurements.

 

[tb46]

Hi epa,

So you provided sufficient room to install the drivers in the PPSL fashion.

As NEO Dan indicates in Post #29 it might provide cone correction between the drivers. A few old disc cutouts glued together, and screwed into the now wide open path could provide cone correction on the other driver? Obviously you would want that to be easily removable.

Looking forward to your usage impressions too.

Regards,

 

[epa]

yes enough room.
in post 1 you can see the difference in output.
in ppsl mode you loose a tiny bit low end,and a flatter responce.
also the dip is gone around 120 hz(due to the cone correction?)

this thing is loud,i mean your voice occilating through the pressure.

 

[sabaspeed521]

This box is a tad louder than a pair of the dual 12 this I'm building that are 8.4 cu ft external a piece, would be an awesome face off but I don't know when I'll have a pair done to demo.

 

[epa]

you have any plan's /pics

 

[sabaspeed521]

you have any plan's /pics

That I do, well kinda, I have a CAD model and I'm 3 panels in on the build. Current progress is posted 50 inch tall dual tapped horn DIYaudio thread here

Attached is the hornresp model as it is being built. CAD side view is visible a few pages back in the thread at post #648, if you're interested I can upload the full model. Some work is yet to be done so the trim work i'm working on won't be in said model.

Note that the build is a 35 Hz tune. driver has 15 mm xmax and the thermal limit is 500 watts, Could be pushed to 68 V on a transient but I always overbuild and overprotect.

 

[epa]

looks alright to me.
i wil follow it

 

[stewin]

hi all any developments??

 

[epa]

hi stewin
no more development on the double 15
its perfect for what its designed for

 

[stewin]

what is the loudest db it can achieve for long time??

 

[epa]

ive been told 135 db ,no drivers replaced so far.
never measured it myself tho.