3015lf TH @ 35-40hz but only 20" deep help - Page 4 - diyAudio
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Old 8th November 2011, 10:46 PM   #31
ra7 is offline ra7  United States
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This is an interesting box. Thanks Bjorno and Don.

Any cheap replacements for the 3015LF available?
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Old 9th November 2011, 02:15 PM   #32
epa is offline epa  Netherlands
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if you look the last few pages of the ss15 topic,there where some sugestions of alternatives
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Old 5th December 2012, 11:55 PM   #33
maxo is offline maxo  United States
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hey what happened to this thread
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Old 6th December 2012, 02:59 PM   #34
maxo is offline maxo  United States
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bump
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Old 6th December 2012, 03:03 PM   #35
epa is offline epa  Netherlands
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pm justint
he has bild them ,and i beleave hes happy with them.
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Old 12th December 2012, 09:20 PM   #36
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Default Your choice, 32 or 45 Hz

My PA is:
Alan Heath Zed 14 (mixer)
Crown xti 2000 (amp)
2 Peavey PR12 (for tops)
2 Bjorno subs (as listed in this thread)

The xti is set to cross-over at 100Hz, with the Bass Boosted 5 dB and
HiPassed at 30Hz and the tops cut at 16 KHz.

I chose not to use the ss15 because I really wanted 32 Hz and was willing
to accept loosing 3dB of power to get it. In retrospect, that's a high price
to pay for 5 semitones of bass.

Everyone loves the sound!!!
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Last edited by Don Snyder; 12th December 2012 at 09:28 PM.
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Old 12th December 2012, 10:34 PM   #37
maxo is offline maxo  United States
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Quote:
Originally Posted by Don Snyder View Post
My PA is:
Alan Heath Zed 14 (mixer)
Crown xti 2000 (amp)
2 Peavey PR12 (for tops)
2 Bjorno subs (as listed in this thread)

The xti is set to cross-over at 100Hz, with the Bass Boosted 5 dB and
HiPassed at 30Hz and the tops cut at 16 KHz.

I chose not to use the ss15 because I really wanted 32 Hz and was willing
to accept loosing 3dB of power to get it. In retrospect, that's a high price
to pay for 5 semitones of bass.

Everyone loves the sound!!!
Don what plans are those , ohhh i see noe, you posted a plan and a cut list
those look very easy to make for a wood newbie
can you post some measurements out from your prototypes ?
do you paintes them with duratex ? they look PRO !!!! and you matched the color of the Pr12
so i think i dont need more than Pr12s and a pair of the subs

btw, have you tried with just one pr12 and see if the single top can keep up with the 2 subs ?

normally the tops outperform the subs, so is almost a 2:1 ratio Subs to Tops ratio, sometimes even higher
what to know your findings
as the graphs are too low res to really read the numbers
can somebody post hi res graphs of the response of this cab ?

also some more detailed inside pics to see how the braces are installed , on the Don i cant see
Thanks


PD
what drivers can fit the box

Last edited by maxo; 12th December 2012 at 10:48 PM.
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Old 13th December 2012, 03:46 PM   #38
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Hi Bjorno,

I am not familiar with this type of construction. Could you please comment, as I am curious to learn more about this box.

I would assume there will be come cancellation in the bass as the rear and front signal meets in the pipe ?

Thanks in advance!

Bjorn
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Old 13th December 2012, 10:28 PM   #39
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Default Details, details ...

Hi Maxo -

Plans? Post 23

Measurements? Compared to SS15, down 3dB

Paint? Latex House Paint ... Duratex would be much better. House Paint
looks good, but needs retouching after only 3 months.

Power? 200W into each top and 400W into each sub yeilds 125dB/1 meter
measured as 105dB/10 meters. The Subs are louder than the tops.

Braces? I didn't use them and it still works well.

You MUST use HiPass of 30Hz and 24dB/Octave on the sub or they will self
destruct. There can be NO leaks in the cabinet.


Hi Bjohannesen - Have fun ... You have much to learn. Get the HornRes software
and read the "JBell" thread "single sheet ..." or anything by "Tom Danley"
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Last edited by Don Snyder; 13th December 2012 at 10:45 PM.
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Old 2nd January 2013, 02:22 PM   #40
maxo is offline maxo  United States
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BUMPING THIS THREAD

Don,
thanks for the info

one question
how the box will work if you remove the front panel
if you can see the front panel covers half of the woofer if you see the box
facing you

does that thing makes some kind of reflections ?
or is part of the waveguide for the tapped horn thing ?

also i see 2 braces on the cut sheet diagram you made
where are those braces needs to be installed

and one last question, if the box goes down to 35hz,
you seet your high pass to 30 hz ? or 35 hz 24db LR or 48db if you have one, ( i think the dbx driverack only have 24db LR filters )
and voltage limit to 70% of what your driver RMS ratings are ?

Ahhhh and i see on post #10 Bjorno listed a comment for the 3015LF at 290watts on his sim, you can read that just below the thiele small parameteres
so we limit at 290 watts ?
Thanks.

Last edited by maxo; 2nd January 2013 at 02:31 PM.
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