Just ordered 2 18" SI HST D1 drivers..

[compaddict]

I have an Inuke 12000 to run both in sealed 4.0 CF boxes. They are replacing two 4X10" sealed boxes that the drivers are just wearing out. Nick at SI says the Parts Express flat pack 18" are not strong enough for his drivers. So I'm thinking about having Bobby Gatley or John Nolte making me a couple of nice boxes. The journey begins!
HST- mkIII

 

[PCSoldaat]

Where is the DIY? Designing and building for me is the most fun part.
Those drivers are beasts btw!

 

[PCSoldaat]

These drivers are good in small closed boxes, but if you double the volume, here is what you could have too.

 

[compaddict]

I found the driver data. Trying to figure out the app...

 

[PCSoldaat]

Here you have it. Have fun.
Advice to check the parameters anyway.

 

[compaddict]

What design is the green line?
Please and thank you!

 

[PCSoldaat]

That is the vented box. Blue is closed.

 

[mart34]

Last time I modelled a ported SI sub, the port was huge on an extreme level!

 

[compaddict]

Ahhh! I see it. Makes perfect sense now.
Thanks!

 

[GM]

Last time I modelled a ported SI sub, the port was huge on an extreme level!

Right, better overall to morph it into an inverse tapered TQWT, ditto any long vent alignment IME.

 

[mart34]

Right, better overall to morph it into an inverse tapered TQWT, ditto any long vent alignment IME.

Totally agree. I guess a ported design is a compromise though, eg slight space saving of ported vs increased performance of TQWT ? An 18" driver in a TL is huge!

 

[PCSoldaat]

How could I forget the TL. Here's the HST-18 in my tower; just added 1000 cm2 cross-section to the whole line. Actually very pretty result.

 

[GM]

Totally agree. I guess a ported design is a compromise though, eg slight space saving of ported vs increased performance of TQWT ? An 18" driver in a TL is huge!

Yes, you can stuff the box/vent to 'taste' same as the TQWT.

No real space saving since you just combine the box, vent net volumes [Vb], total box depth/vent path-length to make the TQWT and still have the advantage of fine tuning it in room if needed with a now very short vent [aka ML-TQWT]. Win-win IME.

 

[mart34]

Yes, you can stuff the box/vent to 'taste' same as the TQWT.

No real space saving since you just combine the box, vent net volumes [Vb], total box depth/vent path-length to make the TQWT and still have the advantage of fine tuning it in room if needed with a now very short vent [aka ML-TQWT]. Win-win IME.

ML-TQWT is new to me, but I'm very interested if it's same volume but better performance for a given driver. I'll do a bit of research, thanks GM, you've sent me down another rabbit hole !

 

[compaddict]

Listening...

 

[johnyM128]

Where to buy

Where can i buy this drivers?

 

[paulys55]

Stereo Integrity sells them direct

 

[paulys55]

Just saw your location, may not be available, sorry. I run an HST18 mkii in 4 cubic ft sealed powered by an old Crown K2 and the bass is sublime.

 

[johnyM128]

thats sad

 

[BP1Fanatic]

How could I forget the TL. Here's the HST-18 in my tower; just added 1000 cm2 cross-section to the whole line. Actually very pretty result.

HST-mkiii 18 Sd = 176.71 in^2 x 2.54 x Pi = 1,410 cm^2.