Tapped Horn - From Parts On Hand

[BryceJ]

I have been reading a lot of the threads on tapped horns and I would like to try to build one. I found a design by Don Snyder that looked like it may meet my needs.

One change I would like to make to the design is to move the opening from the side (c in the first drawing) to the bottom (f in the second drawing). I don't believe that this should be a problem.

I would also like to use one of the Shiva 12" drivers that I have on hand. I took the Hornresp parameters supplied by Don and hopefully updated the information for the Shiva driver correctly.

I am primarily looking for bass extension to the low 30Hz range. I believe that this design gives me 30Hz - 80Hz ±3dB.

I would appreciate any comments or suggestions. I would especially like to hear if I have missed something.

Cheers, Bryce.

 

[chris661]

Moving the mouth should be okay - doesn't look like the path lengths change much at all, so you're likely to get away with it.

Might be worth double-checking what happens if you enable Lossy Le on Hornresp - drivers with lots of Xmax and high inductance are often more accurately simulated with Lossy Le (or semi-inductance, if you've got the additional data) in place.

Chris

 

[turk 182]

would changing the drivers axis of operation have a long term consequence, i've heard people complain about horizontally mounted drivers with respect to cone sag with gravity over time.

 

[snappyturtle]

would changing the drivers axis of operation have a long term consequence, i've heard people complain about horizontally mounted drivers with respect to cone sag with gravity over time.

Resources - Woofer Mount Up Down

in my personal experience up/down firing usually affected excursion at high power. ie it seemed the driver would bottom a little easier.

 

[Brian Steele]

That response curve suggests that particular driver does not really want to be mounted in a TH. You might likely get better results with an offset transmission line alignment. See my "Boom Unit" build for what this type of alignment might look like.

The Subwoofer DIY Page v1.1 - Projects : The Boom Unit

 

[BryceJ]

Thanks Brian,

I will have a look at that.

 

[BryceJ]

Another 12" Driver

That response curve suggests that particular driver does not really want to be mounted in a TH.

Hi Brian,

I have seen the first 12" driver used and the results are reported to be good. Is this speaker also not the best choice for a TH? The graph looks very similar to the Shiva graph to me, but I am not sure what difference I am looking for.

The second image is the Beyma 12LX60. Am I correct that this driver is a better fit for a TH?

Thanks for your help.

 

[Brian Steele]

The second image is the Beyma 12LX60. Am I correct that this driver is a better fit for a TH?

That Beyma does look like a better fit, but the TH design could perhaps be optimized a bit further.