My Bass Horn Project (Input Welcomed:) )

bigmike216 · 23rd July 2004, 11:04 PM

I'm taking a shot at my own horn. Driver will be a single Eminence LAB12 per cabinet. This if my first time using Hornresp, so any input would be greatly appreciated. If you see something horribly wrong, please tell me,

I will have a 35 Hz High pass on theese, as they will be used in PA applications. Will be running 2 per side, or 4 in the center. They will be low passed at 80Hz, as that's about where my midbass picks up. Having ISP problems right now, so images are going to have to put hosted on geocities. If the links don't work, copy and paste them into a new window.

Response in eigth space:

http://geocities.com/michaelmacwillie/response.jpg

My Input into Hornresp:

http://geocities.com/michaelmacwillie/input.jpg

All input is welcome If it looks good to you guys, I'll go ahead and do up a CAD drawing.

Centauri · 24th July 2004, 08:56 AM

Mmmm...... files not available for viewing. To have these files on Geocities, you may have to create an index.html file as per their terms of use.

Sort that out and we can take a look at the design.

Cheers

bigmike216 · 24th July 2004, 10:54 AM

Hmm, wierd, works fine from here if I copy and paste it

I'll make up a quick html file.

bigmike216 · 24th July 2004, 11:11 AM

Here we go. Hopwfully this works.

http://www.geocities.com/michaelmacwillie/

Centauri · 24th July 2004, 12:57 PM

Yep, that worked!

Doesn't look too bad. Value of Vtc is a bit low, but this only effects top end response anyway. Quite a long path length, but this smooths the large ripples that show in the LabSub response - the Lab12 really likes to be in a 15Hz horn....

I would be inclined to increase Vrc a little just to get rid of that peak at 35Hz and smooth the rolloff.

Procede with the Cad! (BTW which cad will you be using?) and make sawdust!

PS: Check the diaphram displacement graph with different input levels to determine the power which will hit Xmax, then don't run too much more power than that into them - a few have been shredding cones in the LabSub lately by pushing them too hard.

Cheers

paulspencer · 24th July 2004, 02:28 PM

Mike,

I saw a website where a Lab12 was done in a modified version for a church. It was simplified by stretching it out into a long horn, not folded. I believe this gives a smoother response. If it can be done practically for your application then perhaps it's worth considering. I imagine it might be easier to construct.

bigmike216 · 24th July 2004, 11:11 PM

Thanks for your suggestions! I will give that a go with increasing the Vrc to smooth out that ripple at 35Hz, and i'll post back in a few

I am aware of thoose shredded LAB's, I read about it on the PSW forums. (I'm Michael M there.)

Paulspencer:

I have also seen that LAB12 stretchet out horn. Quite impressive! Unfortunately, it wouldnt be practical for my application, as mine need to be portable.

Mike.

bigmike216 · 24th July 2004, 11:36 PM

I tried palying around with Vrc and Vtc. While i got the responce a bit flatter, I also lost a ton of power handling. that low peak is actually at 33Hz, which is below my HPF frequency (24db/oct) SHouldnt my High pass also help to bring this peak down a bit?

Centauri · 25th July 2004, 08:57 AM

With the steep hi-pass at 35Hz, combined with not a lot of signal this low anyway, then it maybe best to leave the peak if it gives you greater power handling - as usual, all these things are a matter of finding the right compromises.

I am currently working on single Beyma 12LX60 subs, slightly shorter path length, but still good to 35Hz.

Cheers

bigmike216 · 25th July 2004, 09:30 AM

Cool, I'll have to keep an eye out for a thread about them

I started laying out this horn.. and I think i'm going to have to go back to the drawing board. Physical size will be huge

I knew it would be big, but laying it out really put it into perspective.

23rd July 2004, 11:04 PM	#1
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	My Bass Horn Project (Input Welcomed:) ) I'm taking a shot at my own horn. Driver will be a single Eminence LAB12 per cabinet. This if my first time using Hornresp, so any input would be greatly appreciated. If you see something horribly wrong, please tell me, I will have a 35 Hz High pass on theese, as they will be used in PA applications. Will be running 2 per side, or 4 in the center. They will be low passed at 80Hz, as that's about where my midbass picks up. Having ISP problems right now, so images are going to have to put hosted on geocities. If the links don't work, copy and paste them into a new window. Response in eigth space: http://geocities.com/michaelmacwillie/response.jpg My Input into Hornresp: http://geocities.com/michaelmacwillie/input.jpg All input is welcome If it looks good to you guys, I'll go ahead and do up a CAD drawing.

24th July 2004, 02:28 PM	#6
paulspencer diyAudio Member Join Date: Sep 2003 Location: Melbourne, Australia	Mike, I saw a website where a Lab12 was done in a modified version for a church. It was simplified by stretching it out into a long horn, not folded. I believe this gives a smoother response. If it can be done practically for your application then perhaps it's worth considering. I imagine it might be easier to construct. __________________ AUDIO BLOG \| Bass integration guide My work: www.redspade.com.au web design studio

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24th July 2004, 08:56 AM	#2
Centauri diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	Mmmm...... files not available for viewing. To have these files on Geocities, you may have to create an index.html file as per their terms of use. Sort that out and we can take a look at the design. Cheers

24th July 2004, 10:54 AM	#3
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	Hmm, wierd, works fine from here if I copy and paste it I'll make up a quick html file.

24th July 2004, 11:11 AM	#4
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	Here we go. Hopwfully this works. http://www.geocities.com/michaelmacwillie/

24th July 2004, 12:57 PM	#5
Centauri diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	Yep, that worked! Doesn't look too bad. Value of Vtc is a bit low, but this only effects top end response anyway. Quite a long path length, but this smooths the large ripples that show in the LabSub response - the Lab12 really likes to be in a 15Hz horn.... I would be inclined to increase Vrc a little just to get rid of that peak at 35Hz and smooth the rolloff. Procede with the Cad! (BTW which cad will you be using?) and make sawdust! PS: Check the diaphram displacement graph with different input levels to determine the power which will hit Xmax, then don't run too much more power than that into them - a few have been shredding cones in the LabSub lately by pushing them too hard. Cheers

24th July 2004, 11:11 PM	#7
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	Thanks for your suggestions! I will give that a go with increasing the Vrc to smooth out that ripple at 35Hz, and i'll post back in a few I am aware of thoose shredded LAB's, I read about it on the PSW forums. (I'm Michael M there.) Paulspencer: I have also seen that LAB12 stretchet out horn. Quite impressive! Unfortunately, it wouldnt be practical for my application, as mine need to be portable. Mike.

24th July 2004, 11:36 PM	#8
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	I tried palying around with Vrc and Vtc. While i got the responce a bit flatter, I also lost a ton of power handling. that low peak is actually at 33Hz, which is below my HPF frequency (24db/oct) SHouldnt my High pass also help to bring this peak down a bit?

25th July 2004, 08:57 AM	#9
Centauri diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	With the steep hi-pass at 35Hz, combined with not a lot of signal this low anyway, then it maybe best to leave the peak if it gives you greater power handling - as usual, all these things are a matter of finding the right compromises. I am currently working on single Beyma 12LX60 subs, slightly shorter path length, but still good to 35Hz. Cheers

25th July 2004, 09:30 AM	#10
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	Cool, I'll have to keep an eye out for a thread about them I started laying out this horn.. and I think i'm going to have to go back to the drawing board. Physical size will be huge I knew it would be big, but laying it out really put it into perspective.

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