How much mass can you add to a PR? Or how low can you tune? - AVS | Home Theater Discussions And Reviews

AVS | Home Theater Discussions And Reviews > Audio > DIY Speakers and Subs > How much mass can you add to a PR? Or how low can you tune?

DIY Speakers and Subs

rhodesj's Avatar rhodesj
07:08 AM Liked: 87
post #1 of 8
Yesterday | Posts: 419
Joined: Apr 2005
I was contemplating build options for a UXL18, and with a pair of TC Sounds VMP18s with 6 kg of mass in a 12 CF box gives 10 Hz tuning, which would be cool... But 6 kg seems like way too much weight. PE tech support didn't know, and TC support never replied to my email.

So the real question is, is there a PR that will let you tune a UXL18 to 10 Hz?
michael hurd's Avatar michael hurd
08:14 AM Liked: 28
post #2 of 8
Yesterday | Posts: 2,120
Joined: Nov 2007
Quote:
Originally Posted by rhodesj View Post
I was contemplating build options for a UXL18, and with a pair of TC Sounds VMP18s with 6 kg of mass in a 12 CF box gives 10 Hz tuning, which would be cool... But 6 kg seems like way too much weight. PE tech support didn't know, and TC support never replied to my email.

So the real question is, is there a PR that will let you tune a UXL18 to 10 Hz?
From the old information I have, 2.5KG of added mass is the maximum recommended for the TC VMP's.
cubdenno's Avatar cubdenno
08:48 AM Liked: 64
post #3 of 8
Yesterday | Posts: 1,508
Joined: Dec 2008
Quote:
Originally Posted by rhodesj View Post
I was contemplating build options for a UXL18, and with a pair of TC Sounds VMP18s with 6 kg of mass in a 12 CF box gives 10 Hz tuning, which would be cool... But 6 kg seems like way too much weight. PE tech support didn't know, and TC support never replied to my email.

So the real question is, is there a PR that will let you tune a UXL18 to 10 Hz?
Yeah, once you reach the max weight, you are stuck doing 1 of two things.
Use less PR's (like making a port with less port area)

or

make enclosure bigger to increase volume

Or a third or fourth option I guess.

Third...
Tune higher

Contact SI or Sundown Audio and see if they can make a Custom PR out of their new baskets that allow 45mm + one way throw and use just one. Which if you already got the TC's... wouldn't be an option for me.
rhodesj's Avatar rhodesj
11:14 AM Liked: 87
post #4 of 8
Yesterday | Posts: 419
Joined: Apr 2005
Yeah, a custom PR is probably not in the budget. . 2.5kg total with 2 VMP18s tunes to 15Hz, which isn't bad. Right now I've got 4 sealed HT18s, so the scenario I'm pondering is whether I try to add two sealed UXLs, or replace the HT18s with a pair of ported UXLs...
Jay1's Avatar Jay1
11:21 AM Liked: 164
post #5 of 8
Yesterday | Posts: 4,330
Joined: Aug 2002
You might find it easier to just build something like the easy button?

Easy Button End Table MAX 26.5" x 24" x 37.5" hwd
BassThatHz's Avatar BassThatHz
11:59 AM Liked: 540
post #6 of 8
Yesterday | Posts: 3,816
Joined: Apr 2008
You should build a Ghorn and put an SI-18 in it.

The best-case scenario is that it works wonders and you have more output than a UXL-18 without having to buy them.

Worst-case scenario is that you blow an SI-18 up and are out $159.
and in that case, buy the UXL-18 and put it in the GHorn.
Above 16hz the GHorn outputs up to 128db with room-gain, and is -3db @ 13hz.

Watch lukes dual GHorn video:
I couldn't even imagine 4 GHorn's... even based on a weak driver like the SI-18.
When you are generating 150db @ 20hz you'll forget all about 10hz!

If the GHorn is too big you could try a LHorn,
or if you are feeling really adventurous: prove out my HzHorn for me.
rhodesj's Avatar rhodesj
07:13 PM Liked: 87
post #7 of 8
Yesterday | Posts: 419
Joined: Apr 2005
Rofl! Okay, I could mechanically squeeze a 42x45x30 box in place of my current subs, but if I tried replacing my exiting 8CF sealed boxes (40x24x20) with something 30 CF gross, I think my wife would flip.
BassThatHz's Avatar BassThatHz
01:03 AM Liked: 540
post #8 of 8
Today | Posts: 3,816
Joined: Apr 2008
The Ghorn is 24x45x45, the LHorn is 30x72x25, and the HzHorn is 25x84x25.

I designed the HzHorn to fit in the existing stacked location of my LMS's. Basically it's the same size, just a little bit less than x2 the height. (For just 1 driver.)

Reply DIY Speakers and Subs

Subscribe to this Thread

Powered by vBadvanced CMPS v3.2.3