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killerfishes 27th December 2009 02:20 AM

30hz 10" tapped horn magic?
1 Attachment(s)
just did a quick hornresp. what do you think for my music room?
Type : Davis 25 SCA 10W
Impedance (Ohm) : 6 ohm
Sensitivity (dB) : 92
Fs : 28 Hz
Re : 5.96 ohm
Res : 34.32 ohm
Qms : 2.23
Qes : 0.39
Qts : 0.33
BL : 10.08
Xmax : 4 mm
Cms : 712 μm/N
Mms : 30.9 g
Vas : 109 L
Sd : 330 sq. cm.
Le : 0.53 mH
see attachment

Joachim Gerhard 27th December 2009 02:26 AM

If you filter stiff over 100Hz it should be fine. How big is that thing ?

killerfishes 27th December 2009 02:49 AM

9.5ft long
3.69 cu.foot system volume
fold it and should not be too bad. I just don't know about the 4mm x-max. at 40hz and 2 watts is showing about 3.7 mm @106dB

Edit. with room loading my dual horns play to a 74hz F3

Joachim Gerhard 27th December 2009 03:11 AM

There was a horn in the 60th that i build in the 70th called "Schmacks Horn" that also got down to 30Hz and was not extremely big. It sounded great as far as i remember and i plan to build one again soon. I whould like to show my son what we did in hippy time.
I build that horn from soft chipboard with the kitchen knife of my mother. I stated at noon and at 8PM i had it ready for party on that day. We called that BEAT Abend.

picowallspeaker 27th December 2009 03:28 AM

I have seen that plan of the Schmacks Horn ,as far I can remember it was suggested for large 12" drivers with stiff suspension . Nowadays with the availability of long-throw and power angry subs together with high power plate amps ,the size could be reduced to a fourth .

Joachim Gerhard 27th December 2009 03:36 AM

no, it was an 8 " wideband driver. you can find the plans on the web or i can look for you.

Joachim Gerhard 27th December 2009 03:38 AM

here it is Ein Hornprojekt nach Schmacks

picowallspeaker 27th December 2009 03:58 AM

Thanks ,Joachim...I had been vague but those horn designs have been very inspirational to me some years ago . I was saying that fashion changed a little from 30 years and now I would expect the same impact from a little 2 way box . Not to talk of subs ,where power and heat demands (of the magnets) has to be considered.

Joachim Gerhard 27th December 2009 04:27 AM

yes, i am also listening to conventional boxes but because of my MPP thread where i whould like to design a total sytem i was interested in high sensitivity again. i think designs like this horn or dipols are ideal for DIY. they are hard to get in good quality comercially and when they are very expensive because of the woodwork and the expensive drivers.

picowallspeaker 27th December 2009 05:15 AM

Oooh ! I see ...just took a quick glimpse at the beginning of the thread ,then forgot it.
Now just skipped some (technical) pages and watched the PDF at last:pretty obscure !
Could it be more hidden ?!?
I feel safer with your words ,those are the same feelings I have towards DIY.

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