New baffle for my Bastani Prometheus

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icebear

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Joined 2003
#1
I have been living with my speakers in different baffles for a year. It was time to make something permanent. I choosed 19mm birch wood.
At the same time I made a new dipole woofer (in an Ikea box 🙂 )

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#2
Especially LOVE your Ikea subwoof special😀

Isn't that a laundry box? BTW, did you happen to notice if Ikea have big enough boxes to accommodate my 15" woofs?
Cheers

p.s. the spkrs look good too -- but you already knew that😉
 
#3
eeexcelente!

can you show us how you made the ob stand?
is it stable enough? arent you affraid it will tip over to the front?

is one subfoower enough? can it keep up at high spl? wouldnt two subs placed under ob be better? what is crossover fr you use? do you bimap it?

well, sorry for too many question, I am glad to see people going this way, i was listening to ob for ten years now and wouldnt go back, maybe for full horn system...but thats another story
 
#4
adason said:
eeexcelente!

can you show us how you made the ob stand?
is it stable enough? arent you affraid it will tip over to the front?

is one subfoower enough? can it keep up at high spl? wouldnt two subs placed under ob be better? what is crossover fr you use? do you bimap it?

well, sorry for too many question, I am glad to see people going this way, i was listening to ob for ten years now and wouldnt go back, maybe for full horn system...but thats another story
Click to expand...


Hi adason

I made the Ob from one plate of 19mm birch (240 * 62 cm). The front of the ob is 103*40 cm. The wings is cut out from the rest of the plate. I had to cut it mirrored to make it last. The thick end was next to the thin end...

To make it stay uprigth, it just an L (like the ones for supporting shelves) on the back to the floor. The weigth of the magnet keeps it from tipping forward. It is ok, but I may make a better support later.

I'm using two woofers. The other one is a linkwitz type. Just experimenting with bass. Have also tried a Ripole., but the SPL is too low. The sub is placed rigth beside the ob's, and thats ok. To attach the ob to the sub is not a very good solution. The sub is vibrating some, and I do not want it to spread it to the ob.
The ob's is supposed to run fullrange, but I have applied a 6dB filter in the coupling cap in my Decware SE84 (nothing added, just changed). It cuts at aprox 50hz. That is to avoid LF saturation in the trannys (don't know if it matters 🙂
The sub is feed from a amplifier running a linkwitz filter. Cut's at 90 hz/12dB. ( http://www.linkwitzlab.com/images/protos/w-xo-lp2.gif )

I agree, it no way back 😀

Cheers
 
#6
Gregm said:
Especially LOVE your Ikea subwoof special😀

Isn't that a laundry box? BTW, did you happen to notice if Ikea have big enough boxes to accommodate my 15" woofs?
Cheers

p.s. the spkrs look good too -- but you already knew that😉
Click to expand...


This unit measures: 40,5 * 40,5 * 40,5 cm inside
It would fit a 15" more or less, but not much space left to the sides.
Would make a nice H-baffle 🙂

Why does everybody say it's a laundry box? It is as much a dipole woofer as a laundrybox 🙂

Cheers
Bjørn
 
#10
The ob's is supposed to run fullrange, but I have applied a 6dB filter in the coupling cap in my Decware SE84 (nothing added, just changed). It cuts at aprox 50hz. That is to avoid LF saturation in the trannys (don't know if it matters 🙂
Click to expand...

hi icebear,
thanks for detailed description of you ob, i would advice for the better stand, i tiped over my baffle a couple of times in the past, not pleasant...now its mounted on top of the sub, basszila like, for better integration withthe bass, plus its much more stable, with isolation pad in between

anyway, interestingly i use steven deckerts zen amp too, pretty musical sounding amp, with low fr roll of too, my starts at 150 Hz, it never hurts to limit bass to such a small power amp, although I have replaced output trafo with much bigger one

i think that the ob should not be run fullrange, based on the size of the baffle, it will never produce lowes octave anyway, why to brink low fr signal to the woofer, it will be just flaping in the air, most likely just increasing distortion

nice work! enjoy the music
 
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