Question about Open Baffle project

gvimhoof · 14th September 2009, 03:45 AM

Greetings!

I have a question of ignorance. I'm building a two-way Open Baffle speaker with a large 15 inch woofer on the bottom based on the Martin King passive two-way projects I found on-line. When laying out the placement for the woofer, I centered it 10 in from the bottom. My question is do I leave the bottom of the H-frame open to the floor? If I close it off to keep the 16 inch opening the bottom of the H-Frame will be off the floor and that seems counter-intuitive to me.

Cordially,
Graf

Godzilla · 14th September 2009, 02:25 PM

http://www.zillaaudio.com/speakers-t...woofer-bib.htm

My H-frame has a bottom piece. It sounds amazing! I'd describe the bass as guttural, full and dynamic.

I no longer use the 12" powered sub in the picture. It's been stored away for another time.

Godzilla

Pit Hinder · 14th September 2009, 05:06 PM

Graf, compared to the wavelengths involved those puny few in. look negotiable to me. The additional board stiffening the H frame seems a very good idea.

Mind - this is pure S.W.A.G. , I have no experience with OB woofers.

gvimhoof · 14th September 2009, 11:22 PM

Greetings!

It was definitely a question of ignorance. I appreciate your taking the time to reply!

Cordially,
Graf

Brisso57 · 3rd August 2010, 02:30 AM

I'm considering building the MJK Eminence 15A / Fostex OB design.
I have a larger than average listening room, rectangular with a high skillion ceiling. Plasterboard & glass. There are no problems with placing the OB's away from the rear wall, but it occurred to me to ask (before construction!) if my room was too large for this design at reasonable listening levels.

Would anyone care to comment with their experience in larger rooms?

Thanks

Doug

mor2bz · 3rd August 2010, 02:53 AM

don't worry Brisso57. the ones i built reside in a 2000 sq. ft studio,
ceiling mounted. the guy i half deaf, and is completely happy.

i am not saying that these don't sound great to someone with good
hearing.

again, don't worry. every speaker can be overdriven, but you are
going to like these. just do it.

gvimhoof · 3rd August 2010, 08:20 PM

I haven't taken these anywhere outside of my living room, which isn't big, but configured such that I can use these ~4ft from the wall behind them. Other than pushing them after 100hrs of breaking in to see how much my ears could take, I very rarely push these into concert levels. I think they could fill a much larger room with ease. The detail is such that I find I don't have to turn them up very loud at all to hear every thing in my concert recordings.

Plus they are so easy to build! You could make a rough "mule" to see if they work in your space, and then decide if they work for you.

14th September 2009, 03:45 AM	#1
gvimhoof diyAudio Member Join Date: Aug 2009 Location: Athens, GA	Question about Open Baffle project Greetings! I have a question of ignorance. I'm building a two-way Open Baffle speaker with a large 15 inch woofer on the bottom based on the Martin King passive two-way projects I found on-line. When laying out the placement for the woofer, I centered it 10 in from the bottom. My question is do I leave the bottom of the H-frame open to the floor? If I close it off to keep the 16 inch opening the bottom of the H-Frame will be off the floor and that seems counter-intuitive to me. Cordially, Graf

14th September 2009, 02:25 PM	#2
Godzilla diyAudio Member Join Date: Nov 2005 Location: New York	http://www.zillaaudio.com/speakers-t...woofer-bib.htm My H-frame has a bottom piece. It sounds amazing! I'd describe the bass as guttural, full and dynamic. I no longer use the 12" powered sub in the picture. It's been stored away for another time. Godzilla __________________ www.zillaaudio.com/bib/bib.asp www.ZillaAudio.com

3rd August 2010, 02:30 AM	#5
Brisso57 diyAudio Member Join Date: Sep 2005 Location: the leafy west of Brisbane	What size room is the max for the MJK OB? I'm considering building the MJK Eminence 15A / Fostex OB design. I have a larger than average listening room, rectangular with a high skillion ceiling. Plasterboard & glass. There are no problems with placing the OB's away from the rear wall, but it occurred to me to ask (before construction!) if my room was too large for this design at reasonable listening levels. Would anyone care to comment with their experience in larger rooms? Thanks Doug __________________ A speaker-builder's parable: "That burned down, fell over, then sank into the swamp. But the fourth one stayed up. And that's what you're going to get, Lad, the strongest castle of all."

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14th September 2009, 05:06 PM	#3
Pit Hinder diyAudio Member Join Date: Nov 2006 Location: Hannover, Germany	Graf, compared to the wavelengths involved those puny few in. look negotiable to me. The additional board stiffening the H frame seems a very good idea. Mind - this is pure S.W.A.G. , I have no experience with OB woofers.

14th September 2009, 11:22 PM	#4
gvimhoof diyAudio Member Join Date: Aug 2009 Location: Athens, GA	Greetings! It was definitely a question of ignorance. I appreciate your taking the time to reply! Cordially, Graf

3rd August 2010, 02:53 AM	#6
mor2bz diyAudio Member Join Date: May 2005 Location: colorado	don't worry Brisso57. the ones i built reside in a 2000 sq. ft studio, ceiling mounted. the guy i half deaf, and is completely happy. i am not saying that these don't sound great to someone with good hearing. again, don't worry. every speaker can be overdriven, but you are going to like these. just do it.

3rd August 2010, 08:20 PM	#7
gvimhoof diyAudio Member Join Date: Aug 2009 Location: Athens, GA	I haven't taken these anywhere outside of my living room, which isn't big, but configured such that I can use these ~4ft from the wall behind them. Other than pushing them after 100hrs of breaking in to see how much my ears could take, I very rarely push these into concert levels. I think they could fill a much larger room with ease. The detail is such that I find I don't have to turn them up very loud at all to hear every thing in my concert recordings. Plus they are so easy to build! You could make a rough "mule" to see if they work in your space, and then decide if they work for you.

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