40Hz TH

[Dag Johansen]

How did you bolt the drivers on ? Did you use T-nuts on the other side and normal bolts to fasten it ?

For now its just screwed in the wood, but when they come in for a service/paintjob next time i will mount t-nuts!

Dag

 

[Dag Johansen]

Vented/bass-reflex or front loaded horns? And which model(s) are you comparing them to?

I have swapped back and forth with SB1000, which is about 35% bigger in volume.
I did not meassure it, but i estimate the difference to be around 6-7dB's in favour of the tapped horn.
I'm not sure, but i think SB1000 is a 4ohm subwoofer.

I have also compared it to a homemade box with 2 Eminence 3015LF same size, and i have to say, the difference is huge in the 35-40Hz region.

Dag

 

[epa]

hi dag.
it seems i shamelessly copy'd your fold.

 

[Dag Johansen]

hi dag.
it seems i shamelessly copy'd your fold.

Haha, thats ok, i think we are running out of folds these days!

Dag

 

[Dag Johansen]

So, measurements any day now..
Any inputs apreciated.
White noise, sine sweep?
2,83volt or 28,3?
I will use Ipad with calibrated mic, Audiotools app.

How far from nearest building?

Dag

 

[weltersys]

So, measurements any day now..
Any inputs apreciated.
White noise, sine sweep?
2,83volt or 28,3?
I will use Ipad with calibrated mic, Audiotools app.

How far from nearest building?

Dag

Dag,

Nice looking build!
28.3 volts sine sweep at 10 meters would be good if you can get several wavelengths (20 meters or more) away from any buildings.

Tests of 1, 2, 4 and 8 cabinets would be nice. The cabinets should be brought out and stacked in that order, as surrounding cabinets, unplugged or shorted have an effect on response.

Art

 

[martinsson]

Really nice build, even if they're not THAM's

Looking forward to the measurements and thank's for sharing, this is why I fawouur open community development where the knowledge is free and shared, the best way by far, compared to the locked in proprietary models.

Hoppas allt går bra med mätningarna, vem vet, kanske hör något avlägset muller här i Göteborg

 

[reminence]

just wanted to double check that the ande lb1560 drivers would be a good match for the 40hz th?

JDs Sound and Lighting. Ande LB1560 15" 600W 8 ohm driver / speaker

 

[Dag Johansen]

just wanted to double check that the ande lb1560 drivers would be a good match for the 40hz th?

JDs Sound and Lighting. Ande LB1560 15" 600W 8 ohm driver / speaker

Its not optimal, it becomes more like a 55Hz TH.

Dag

 

[tb46]

Hi Dag Johansen,

Yes, really nice build. By the way, if anyone needs two new, unused, untested LAB15 drivers (loacated in Texas) pm me.

Regards,

 

[Chano]

Congratulations.

 

[m R g S r]

Hi Dag Johansen,

Yes, really nice build. By the way, if anyone needs two new, unused, untested LAB15 drivers (loacated in Texas) pm me.

Regards,

Trade a Lab 15 for a 3015lf?
Or two for two? I have two 3015lf's.

 

[tb46]

Hi mRgSr,

I'm looking more for something for a HT. Anyway, should not have posted this here anyhow.

Regards,

 

[reminence]

Its not optimal, it becomes more like a 55Hz TH.

Dag

That sucks. Any quick advice as to builds similar to this that it would work in. I think you may have said the driver is near identical to a 3015lf i believe.

thanks

 

[tb46]

Hi reminence,

The furybox by screamerusa should fit the Ande LB1560: http://www.diyaudio.com/forums/subwoofers/131852-live-sound-specific-tapped-horn-thread.html .

Regards,

 

[reminence]

Thanks TB46, it seams that the ss15 is also a good box for it too.

 

[phivates]

Any updates Dag? I'm ready to cut BB and I'm wondering if the volume correction chat over on the Xoc1 thread applies to your box or is the LAB 15 tough enough to go ahead on without amendments?

 

[m R g S r]

I think the lab 15 cone is beefy enough so cone correction isn't completely necessary....

 

[tb46]

Hi m R g S r,

The S2 cone correction was not so much about the strength of the cone, but about the proper (or maybe optimum) matching of the driver to the horn.

Regards,

 

[m R g S r]

I thought it was to help distribute the forces on the cone more evenly?