[goonstopher]

I am hoping to build 2 x LLT Sonotubes with 22" tube and ED 19 OV.02 Drivers powered with a Behringer EP2500. I am a DIY and tool newbie. I will have ED build the end caps and insert t-nuts for me and terminals ect but need help on...well... just about everything else.


EDIT:

I have more questions and information and the ever helpful Mike pointed out that it would be best to put them up so everyone can help me.

Here they go:

1. I need help deciding on a port size and length and a Sonotube length. WinISD confused me beyond anything else. I would like to tune them as low as safely possibly for these drivers without losing headroom in mid bass or risking bottoming the driver with too big of an enclosure.

2. I want to add an external Subsonic filter for safety reasons. I would really prefer to use just a single one into the single EP2500. Can I do that?

3. Where the do I get the sonotubes.

I am sure I will need more help but I am about to commit to sell my 2 month old pb13 Ultra and want to make sure before I give my buyer a yes.

 

[goonstopher]

I thought some more info might be helpful.

The EP2500 was tested at 800+ watts into 2ohms when run in stereo. I think that sound perfect for this driver. Does that help with modeling it?

 

[goonstopher]

I am a bit confused. Why did you say tuned to 13hz but the sonotube program numbers were generated with 18hz written in. would you say 18hz is the lowest, safest overall most balanced tune for this woofer?

 

[goonstopher]

And it looks like from your number that I need to wire the driver to 4ohms to use the EP2500 which is fine.

Can I use a single low pass filter like the one you mentioned in the other thread i posted before the EP2500 for the two drivers?

 

[goonstopher]

Sweet! I will have more questions I am sure.

This might be the first live build thread when all my stuff comes cause I literally might be sitting here asking questions at most steps haha.

 

[goonstopher]

Mike sorry to keep on asking but...

On the sonotube program you put up a screen shot of it has a 15" sound splinter driver listed.

 

[goonstopher]

Oh OK I thought the woofers individual properties changed the dimensions and tuning needed.

I believe MKTheater built several of these with 24" sonotubes tuned to 14hz but I think his were 6' tall.

 

[goonstopher]

Did Spiral Fittings ever reply to your email about the bellmouth fittings?

 

[goonstopher]

Nice I would give it a try so everyone can see.

MKtheater who built a bunch of these tubes warned me to be careful about the diameter of the sono's because they differ even when they claim to be the same size. I will have to bring the port with me when I get the sono for the port.

 

[goonstopher]

I was looking over the Reckhorn and I am a bit confused.

The Bass boost frequency and High cut knob seem like problems you would need to bypass. Am I right? Do you just turn the bass boost to 150hz so it above the crossover anyway and doesn't see signal at that frequency to have an effect on? Then just turn the high cut off?

 

[goonstopher]

3 Latest questions.

Where do you get SonoTubes?

If I end up locating them in different places could I get an external delay box for the closer sub and effectively control phase that way? What other solution is their to phase cancelation?

Would it be safe to tune it any lower or is there just no need?

This better be an upgrade from my PB13 Ultra ha I am so nervous to sell this thing.

 

[goonstopher]

Wow that is a hard decision. I like aspects of both - Oh well there is time to decide

Unfortunately I am scared I will be forced to co-locate because the phase or distance issue seems impossible to account for unless you just do a 180 switch. I really think that with this much power in such a small room I would be better served if I spaced them out for an even response but that would mean one would be close to me and might have cancellation.

 

[goonstopher]

Wow...Why does it need to be so tall? For the Maelstrom it only needed 7'

I guess I need to go with the 18hz tone.

MKTheater used 24" (he said they were actaully 23.5) tube cut to 72" with 8" ports (actually 7.5) that were 33 inches long, tuned to 13.5hz.

I don't know if his numbers are right but thats what he told me.

 

[goonstopher]

I understand.

I don't think this driver would work in something that big.

Maybe his numbers are wrong?

When I put the number he claims are tuned to 13.5hz into Sonosub I get a tuning of 27.1hz? But says he has done SPL test flat to 10hz at up to 120db with those numbers.

 

[goonstopher]

Height really isn't an issue. I have 9 foot ceilings. I am more scared by what Brett ad eD said about their being a point the enclosure becomes too big and the sub acts like it is moving in free air and can bottom out.

I don't nee much below 18hz to be honest but it seems like eeveryone goes low so i figured it was for a reason. I am an action movie junkie so if I can get more extension safely without too much of a trade off then I am certainly ok with it.

 

[goonstopher]

So to tune this sub to 15hz I would need to make it 98" tall...wow.

 

[goonstopher]

Hi again,

I was just thinking. Is the 600+ that the behringer tested at optimal for this woofer? would wiring it to 2ohms to get 800watts be dangerous considering its reasonably low excursion numbers?

 

[goonstopher]

Ha ok, I never had 20' in mind, I probably wrote something dumb.

I am ok with height but the a7-900 only has an internal size of 10' for 2 of these drivers with a 1300 watt amp. I am sure I can get some more gain by going bigger but who knows where that limit is.

 

[goonstopher]

Ok,

I talked to a place with sonotubes near me and I think I might need some new numbers.

The inside of the Sono's is about 23" they said and for the ports the inside is closer to 7"

When I get the true inside numbers I will need a bit of help getting the port length for an 15hz tone at 6' tall

Will a tune that low hurt the driver at all?

 

[goonstopher]

I'll post up the actual specs of the sonos when I get them.

I will be getting a 12' section so whatever it is cut in half is what I will do for internal volume.