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Mark Seaton's Terraform XL Discussion/Owner's Thread - Page 4

post #91 of 191
I am lloking forward to seeing some actual measurments of the terraform XL's in someones home theater! WIth the freq response people are getting out of the SubM's it should be pretty amazing!
post #92 of 191
Mark illuminates further:

A pair of Terraform XLs will significantly outperform 4x SubMersives in real world performance all else being equal (location) - more than 2x the deep bass capability without loosing anything tangible in the upper octave. The Terraform XL has more equal capability over the range. The headroom and efficiency above 35-45Hz in a SubMersive basically allows it to still use the majority of it's 1000W amplifier for the deep stuff even in complex/busy movie scenes. With the Terraform XL, we're basically bringing that sort of efficiency down into the lower octave while also having all the other benefits of the very low audible distortion of the Terraform design. If you want to SPL race at 50-80Hz with a sine wave or burst, you might loose a couple dB. That's not how you use a system though. Mind you, a SubMersive is ridiculously powerful above 40hz, only a little shy of the huge Genelec HTS6. 2 SubMersives have similar output capability above 45hz as a JTR Growler (pro audio bass horn optimized for above 40-45Hz), but still has the deep extension and we broke things in Zamboniman's home with a single Growler.
post #93 of 191
Can't wait to hear what 4 of those XL's in Fugueness's HT will do, might have to rebuild the house after....
post #94 of 191
Thread Starter 
fugueness,

You're just getting 2 right? I can't be outdone!
post #95 of 191
4, I thought Fugueness was getting two and using them instead of the 4 submersives. 4XL's would be way over the top me thinks. That might even be enough for an IMAX theater
post #96 of 191
Quote:
Originally Posted by Johnsteph10 View Post

fugueness,

You're just getting 2 right? I can't be outdone!

But Fuguness has said he was going with 4 more catalysts to replace his 4 sparks surrounds!!!! That would make a 7.4 catalysts and XL combo!!!
post #97 of 191
Quote:
Originally Posted by Johnsteph10 View Post

fugueness,

You're just getting 2 right? I can't be outdone!

Yes, starting with 2, but I have room for 4 more! First I will run the 2 XL's in conjunction with the 4 Submersives and see how that handles.
post #98 of 191
Quote:
Originally Posted by JapanDave View Post

But Fuguness has said he was going with 4 more catalysts to replace his 4 sparks surrounds!!!! That would make a 7.4 catalysts and XL combo!!!

Yes, Catalyst surrounds should take things up another notch.

Why stop at 7.4? Try 7.7!
post #99 of 191
So... Joeseph... Any Terraform XL's in your possession yet? Just curious.
post #100 of 191
Thread Starter 
Not in my grubby hands, yet...but very soon!

Mark Seaton standing next to them:



The Twin XLs compared to the already-large Submersive:

post #101 of 191
Yikes! they are huge.....but looks oh so mean. Impressive.
post #102 of 191
Quote:
Originally Posted by fugueness View Post

Yes, Catalyst surrounds should take things up another notch.

Why stop at 7.4? Try 7.7!

Quote:
Originally Posted by fugueness View Post

Yes, starting with 2, but I have room for 4 more! First I will run the 2 XL's in conjunction with the 4 Submersives and see how that handles.

Your house is going to fall off the foundation.
post #103 of 191
Quote:
Originally Posted by RMK! View Post

Your house is going to fall off the foundation.

I tolded him, to get extra earthquake insurance....
post #104 of 191
Quote:
Originally Posted by Dbuudo07 View Post

So... Joeseph... Any Terraform XL's in your possession yet? Just curious.

hi do you have a submersive?
post #105 of 191
Quote:
Originally Posted by Johnsteph10 View Post

Not in my grubby hands, yet...but very soon!

Mark Seaton standing next to them:



The Twin XLs compared to the already-large Submersive:


Bonita
post #106 of 191
Quote:
Originally Posted by whasaaaab View Post

hi do you have a submersive?

No. I'm just a fan of Mark's products and his goals in his designs. Same goes for Jeff P. from JTR and Tom Danley. I will be using their products in the near future. Just trying to tie up some personal issues first. Why do you ask?
post #107 of 191
Thread Starter 
Some more updates...and a copy of the Thread Mark started on his forum (I hope he doesn't mind!)

Edit: A link: http://www.seaton-sound-forum.com/post?id=4666795
post #108 of 191
Thread Starter 
From Mark Seaton:

"While there's been plenty of discussion of the Terraform XL product in Johnsteph10's thread, I thought with the production version of the Terraform XL out in the build area, it was time for a dedicated Terraform XL thread.

Note the version for Johnsteph10 was custom built to fit his specific installation, but is the identical internal volumes and tuning, having the same performance. I intend to attempt keeping 1-2 Terraform XL enclosures as shown below in house ready for loading, but it is possible to do custom versions where one dimension is traded for another for some additional cost. The monster you see here is 22.5" x 54" x 28" deep (yes, I look even shorter than usual here):







I am awaiting the new amplifiers to finish these up, but testing thus far has been quite impressive with just how clean and powerful the 11-20Hz output is, with plenty of thanks to the PR loaded bandpass design and 3" radius flares on those huge ports.

More to be added later.."

Also, Mark has mentioned the new custom amps are ready....and even better than originally planned! I'll check in with him or let him comment on these new amps...
post #109 of 191
How fast will these roll off past the tuned frequency? I heard someone say they will put out 10-11hz in room response. It is my understanding that the PR designs roll off very quickly?

Is it possible to have them tuned lower ? or will mean a sacrifice in the upper end bass?
post #110 of 191
Quote:
Originally Posted by Johnsteph10 View Post

From Mark Seaton:

"While there's been plenty of discussion of the Terraform XL product in Johnsteph10's thread, I thought with the production version of the Terraform XL out in the build area, it was time for a dedicated Terraform XL thread.

Note the version for Johnsteph10 was custom built to fit his specific installation, but is the identical internal volumes and tuning, having the same performance. I intend to attempt keeping 1-2 Terraform XL enclosures as shown below in house ready for loading, but it is possible to do custom versions where one dimension is traded for another for some additional cost. The monster you see here is 22.5" x 54" x 28" deep (yes, I look even shorter than usual here):







I am awaiting the new amplifiers to finish these up, but testing thus far has been quite impressive with just how clean and powerful the 11-20Hz output is, with plenty of thanks to the PR loaded bandpass design and 3" radius flares on those huge ports.

More to be added later.."

Also, Mark has mentioned the new custom amps are ready....and even better than originally planned! I'll check in with him or let him comment on these new amps...

Speaking of which... I need two of these monster sized subs to match my column size... I know we've spoke of this (but its been a while) but how shallow and wide could these be if shaped like a column (up to 10 ft high).

Hope all is well!
post #111 of 191
Quote:
Originally Posted by thebland View Post

Speaking of which... I need two of these monster sized subs to match my column size... I know we've spoke of this (but its been a while) but how shallow and wide could these be if shaped like a column (up to 10 ft high).

Hope all is well!

I still suspect a shallow spot between the two front columns is the easiest route, as I believe it will be hard to get shallower than 14-16" in a custom fit Terraform XL (with side, not front exiting port). I'll give it some thought though. Do remember that in effect the bulk package has to remain close in total volume. In very rough figures, at say 15" depth, I suspect one example set of dimensions would be in the ballpark of 60" wide x 40" tall. At least any such option could later be very nicely tucked behind your screen/baffle wall if you ever did open it up again.
post #112 of 191
Quote:
Originally Posted by Mark Seaton View Post

I still suspect a shallow spot between the two front columns is the easiest route, as I believe it will be hard to get shallower than 14-16" in a custom fit Terraform XL (with side, not front exiting port). I'll give it some thought though. Do remember that in effect the bulk package has to remain close in total volume. In very rough figures, at say 15" depth, I suspect one example set of dimensions would be in the ballpark of 60" wide x 40" tall. At least any such option could later be very nicely tucked behind your screen/baffle wall if you ever did open it up again.

I am so afraid to take apart that baffle wall and screen. It's verry tight back there. I don't even know if I could get the B_DEAPS out if I had to at this point.. Ah! You never have enough space....

In terms of column size, could we do 24" wide (perhaps even 30" wide) and 18" depth and as high as you like?

I recall our conversations about using that space between the column and the screen but I worry about the esthetics.

I know this is not an ideal situation.
post #113 of 191
Quote:
Originally Posted by thebland View Post

I am so afraid to take apart that baffle wall and screen. It's verry tight back there. I don't even know if I could get the B_DEAPS out if I had to at this point.. Ah! You never have enough space....

In terms of column size, could we do 24" wide (perhaps even 30" wide) and 18" depth and as high as you like?

I recall our conversations about using that space between the column and the screen but I worry about the esthetics.

I know this is not an ideal situation.

That's not a bad idea Jeff, and I have a few possibilities in mind. Let's take finer details to e-mail or on my own forum. I do have some ideas that should allow a depth of ~16" and width of 22-24" or even 18" with a little less width. A challenge is always welcome, and who knows, it might turn out rather useful to make it available for others as well.
post #114 of 191
Quote:
Originally Posted by Mark Seaton View Post

That's not a bad idea Jeff, and I have a few possibilities in mind. Let's take finer details to e-mail or on my own forum. I do have some ideas that should allow a depth of ~16" and width of 22-24" or even 18" with a little less width. A challenge is always welcome, and who knows, it might turn out rather useful to make it available for others as well.

I knew there was no quit in you!!!

I'll just call you in the next day or so when I can re-measure what dimensions would be the max I could go with... Thanks!
post #115 of 191
Quote:
Originally Posted by Johnsteph10 View Post

Not in my grubby hands, yet...but very soon!

Mark Seaton standing next to them:



The Twin XLs compared to the already-large Submersive:


Good friggin grief man, you'd need to cross brace your room!
post #116 of 191
Mark looks like a Hobbit in those photos.
post #117 of 191
The good news is that the Terraform XL cabinet is so large it can be used as a coffin when you pass away.
post #118 of 191
Quote:
Originally Posted by Stereodude View Post

The good news is that the Terraform XL cabinet is so large it can be used as a coffin when you pass away.

That would happen really fast since the wife would kill you if you brought this thing home.
post #119 of 191
Quote:
Originally Posted by Big Worms View Post

That would happen really fast since the wife would kill you if you brought this thing home.

My wife would be Ok with it but I would have to pay for it myself. Now all I need to do is scrape up enough $$$ for duals .

Bill
post #120 of 191
Quote:
Originally Posted by thebland View Post

I am so afraid to take apart that baffle wall and screen. It's verry tight back there.

How about some Catalysts back there?
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