First look at a high performance PR test sub. - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 17Likes
  • 6 Post By Tom Vodhanel
  • 1 Post By Tom Vodhanel
  • 1 Post By powerdubs
  • 5 Post By Tom Vodhanel
  • 4 Post By Tom Vodhanel
 
Thread Tools
post #1 of 10 Old 08-25-2019, 11:16 AM - Thread Starter
AVS Forum Special Member
 
Tom Vodhanel's Avatar
 
Join Date: May 2011
Posts: 4,883
Mentioned: 127 Post(s)
Tagged: 0 Thread(s)
Quoted: 3049 Post(s)
Liked: 10457
First look at a high performance PR test sub.

Here are a few pictures of a new PR design we're trying out.

21 inch Ipal woofer
dual 18 inch PR

Trying a few different amps with this right now and just beginning the tuning process. So it will be a bit before we can make any determination on this making into production.

The thought process behind it was similar performance to the TV36ipal at about half the size. Someone mentioned it reminded them of the sunfire true subs. I can see that. These are quite a bit larger of course...about 8x in fact.

So 8x larger, maybe 4x more expensive, but around 20x more powerful.

The PRs are mounted inverted now so I can add weight easily. Any final design will have them oriented normally.

Right now I can only get the tune down to 19hz. I purchased a 2.5" dimeter, foot long lead rod and cut it down. But it's not enough mass. I'm getting a 3.5 inch diameter lead rod here this week. That should do it.

Tom V.
Team Power.
Attached Thumbnails
Click image for larger version

Name:	PR-1.JPG
Views:	118
Size:	114.7 KB
ID:	2606994   Click image for larger version

Name:	pr_mass1.JPG
Views:	121
Size:	130.2 KB
ID:	2606996   Click image for larger version

Name:	pr_pic1.JPG
Views:	120
Size:	100.5 KB
ID:	2606998  
sk373, Nalleh, flat4 and 3 others like this.

The woods are lovely, dark and deep, But I have promises to keep,
Tom Vodhanel is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old 08-25-2019, 11:54 AM
AVS Forum Special Member
 
Nalleh's Avatar
 
Join Date: Aug 2014
Location: Norway
Posts: 3,861
Mentioned: 334 Post(s)
Tagged: 0 Thread(s)
Quoted: 2659 Post(s)
Liked: 3647
Looks awsome Tom

How much weight are we talking about pr PR here?

Dual Atmos Receivers - Atmos 13.1.8/DTS X 9.1.8/Auro 3D 13.1 - Denon AVCX8500H+AVRX7200WA - Klipsch+KEF - 6xSI18" - 12xJBL 12" w/6xSLAPS M12 downfiring VNF - 3x2 stacked Crowson MA - 4xBK-LFE - 6xNU6K(fan&trig mod) - Minidsp 10x10HD - Oppo UDP203 - XBox OneX - Apple TV4K - JVC RS600 Dreamscreen V2 120"- Philips 65OLED873.
Nalleh’s HT

Last edited by Tom Vodhanel; 08-25-2019 at 12:15 PM.
Nalleh is online now  
post #3 of 10 Old 08-25-2019, 12:04 PM
Member
 
pitchcut29's Avatar
 
Join Date: Dec 2007
Location: Lemont, IL
Posts: 26
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Liked: 27
Quote:
Originally Posted by Tom Vodhanel View Post
Here are a few pictures of a new PR design we're trying out.

21 inch Ipal woofer
dual 18 inch PR

Trying a few different amps with this right now and just beginning the tuning process. So it will be a bit before we can make any determination on this making into production.

The thought process behind it was similar performance to the TV36ipal at about half the size. Someone mentioned it reminded them of the sunfire true subs. I can see that. These are quite a bit larger of course...about 8x in fact.

So 8x larger, maybe 4x more expensive, but around 20x more powerful.

The PRs are mounted inverted now so I can add weight easily. Any final design will have them oriented normally.

Right now I can only get the tune down to 19hz. I purchased a 2.5" dimeter, foot long lead rod and cut it down. But it's not enough mass. I'm getting a 3.5 inch diameter lead rod here this week. That should do it.

Tom V.
Team Power.
Hi Tom,

Love the idea of a 21” sub, great work! Have you considered using an internal or external SpeakerPower 4000W Amp? Would it add too much to the final cost?

I would love to add a pair of these to the rear of my room.

Thanks,
Jerry

Main: 3 x JTR 212RT | Surrounds: 2 x JTR 210HT | Subwoofer: 1 x JTR Captivator 4000ULF-LP
Amplifier: DAC 5-Cherry | Processor: Emotiva XMC-1 | Projector: JVC DLA-NX7 | PJ Screen: SeymourAV 150" 16:9 Center Stage XD
pitchcut29 is offline  
Sponsored Links
Advertisement
 
post #4 of 10 Old 08-25-2019, 12:14 PM - Thread Starter
AVS Forum Special Member
 
Tom Vodhanel's Avatar
 
Join Date: May 2011
Posts: 4,883
Mentioned: 127 Post(s)
Tagged: 0 Thread(s)
Quoted: 3049 Post(s)
Liked: 10457
Quote:
Originally Posted by pitchcut29 View Post
Hi Tom,

Love the idea of a 21” sub, great work! Have you considered using an internal or external SpeakerPower 4000W Amp? Would it add too much to the final cost?

I would love to add a pair of these to the rear of my room.

Thanks,
Jerry
Using a 4000w torpedo(sp) on it now.

I've never found passive+separate rack amp demand to be worth pursuing. Going all the way back to the svs b4+ sub(circa 2003?) there's just never been much there. The watt/dollar ratio gets worse, you have more end support, etc.

Tom V.
Team Power.

The woods are lovely, dark and deep, But I have promises to keep,
Tom Vodhanel is offline  
post #5 of 10 Old 08-25-2019, 12:15 PM - Thread Starter
AVS Forum Special Member
 
Tom Vodhanel's Avatar
 
Join Date: May 2011
Posts: 4,883
Mentioned: 127 Post(s)
Tagged: 0 Thread(s)
Quoted: 3049 Post(s)
Liked: 10457
Quote:
Originally Posted by Nalleh View Post
Looks awsome Tom

How much weight are we talking about pr PR here?
I'd have to double check but IIRC there's about 1275g per right now(just in added lead).

The 3.5 inch lead rod, cut to size, that's going to be another $400(ish) but it should allow me to add as much as needed and then some.

Tom V.
Team Power.
Nalleh likes this.

The woods are lovely, dark and deep, But I have promises to keep,
Tom Vodhanel is offline  
post #6 of 10 Old 08-25-2019, 12:57 PM
AVS Forum Special Member
 
Nalleh's Avatar
 
Join Date: Aug 2014
Location: Norway
Posts: 3,861
Mentioned: 334 Post(s)
Tagged: 0 Thread(s)
Quoted: 2659 Post(s)
Liked: 3647
^^ Thanks Tom

Very exciting, can’t wait to hear more about this one

Dual Atmos Receivers - Atmos 13.1.8/DTS X 9.1.8/Auro 3D 13.1 - Denon AVCX8500H+AVRX7200WA - Klipsch+KEF - 6xSI18" - 12xJBL 12" w/6xSLAPS M12 downfiring VNF - 3x2 stacked Crowson MA - 4xBK-LFE - 6xNU6K(fan&trig mod) - Minidsp 10x10HD - Oppo UDP203 - XBox OneX - Apple TV4K - JVC RS600 Dreamscreen V2 120"- Philips 65OLED873.
Nalleh’s HT
Nalleh is online now  
post #7 of 10 Old 08-25-2019, 05:23 PM
Senior Member
 
powerdubs's Avatar
 
Join Date: Dec 2011
Posts: 287
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 207 Post(s)
Liked: 147
If this works- I'll be bringing you my pair of S3000i and taking home a pair of these.


I'll make the drive out and back to avoid shipping both ways.
CallingMrBenzo likes this.
powerdubs is online now  
post #8 of 10 Old 08-26-2019, 04:55 PM - Thread Starter
AVS Forum Special Member
 
Tom Vodhanel's Avatar
 
Join Date: May 2011
Posts: 4,883
Mentioned: 127 Post(s)
Tagged: 0 Thread(s)
Quoted: 3049 Post(s)
Liked: 10457
Size perspective shot. Makes a good MT110 stand.


Tom V.
Team Power.
Attached Thumbnails
Click image for larger version

Name:	pr_pic3.JPG
Views:	113
Size:	140.9 KB
ID:	2607568  

The woods are lovely, dark and deep, But I have promises to keep,
Tom Vodhanel is offline  
post #9 of 10 Old 10-11-2019, 04:06 PM
AVS Forum Special Member
 
madhuski's Avatar
 
Join Date: Sep 2010
Location: Minnesota
Posts: 2,746
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 1393 Post(s)
Liked: 885
Quote:
Originally Posted by Tom Vodhanel View Post
Size perspective shot. Makes a good MT110 stand.


Tom V.
Team Power.
Any update as to the progress of this project? (wether it'll make it to production or not?)
madhuski is online now  
post #10 of 10 Old 10-12-2019, 01:21 PM - Thread Starter
AVS Forum Special Member
 
Tom Vodhanel's Avatar
 
Join Date: May 2011
Posts: 4,883
Mentioned: 127 Post(s)
Tagged: 0 Thread(s)
Quoted: 3049 Post(s)
Liked: 10457
Quote:
Originally Posted by madhuski View Post
Any update as to the progress of this project? (wether it'll make it to production or not?)
The PR design got pushed way down on the things-to-do-list due to everything else going on(new 12 series upgrades and value lineup) combined with a 75% increase in sales versus 2018. We've added 4 new people in the last 5 months...probably a few more needed within the next 5 months as well.

Anyway, I don't know if there's ever been a PR sub tuned <15hz. As least not a viable commercial design. So there's some unique challenges involved in this project.

We had to make some major mods to the PRs just to get them to accept the mass involved tuning this low.

Progress is being made, but it's going to be a while before any decisions are made to bring it to the market or not. Best case would be 6-8 weeks, but first quarter 2020 is more likely.

See attached. Those little skinny washers are what is typically used for mass loading a home theater PR design. The 2 inch thick lead is what I used initially for ours. I had to move to 3.5 inch thick(!) lead to get what I wanted.

Tom V.
Team Power.
Attached Thumbnails
Click image for larger version

Name:	mass1.JPG
Views:	37
Size:	126.8 KB
ID:	2627094  

The woods are lovely, dark and deep, But I have promises to keep,
Tom Vodhanel is offline  
Sponsored Links
Advertisement
 
Reply Power Sound Audio

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off