First look at a high performance PR test sub. - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 13Likes
  • 6 Post By Tom Vodhanel
  • 1 Post By Tom Vodhanel
  • 1 Post By powerdubs
  • 5 Post By Tom Vodhanel
 
Thread Tools
post #1 of 8 Old 08-25-2019, 10:16 AM - Thread Starter
AVS Forum Special Member
 
Tom Vodhanel's Avatar
 
Join Date: May 2011
Posts: 4,828
Mentioned: 119 Post(s)
Tagged: 0 Thread(s)
Quoted: 3005 Post(s)
Liked: 10125
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:	59
Size:	114.7 KB
ID:	2606994   Click image for larger version

Name:	pr_mass1.JPG
Views:	63
Size:	130.2 KB
ID:	2606996   Click image for larger version

Name:	pr_pic1.JPG
Views:	63
Size:	100.5 KB
ID:	2606998  
Sekosche, sk373, Nalleh 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 8 Old 08-25-2019, 10:54 AM
AVS Forum Special Member
 
Nalleh's Avatar
 
Join Date: Aug 2014
Location: Norway
Posts: 3,629
Mentioned: 304 Post(s)
Tagged: 0 Thread(s)
Quoted: 2510 Post(s)
Liked: 3376
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" - 8xJBL 12" BOSS - 4xJBL 12" w/SLAPS M12" 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 11:15 AM.
Nalleh is online now  
post #3 of 8 Old 08-25-2019, 11:04 AM
Member
 
pitchcut29's Avatar
 
Join Date: Dec 2007
Location: Lemont, IL
Posts: 24
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 23
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
Subwoofer: 1 x JTR Captivator 4000ULF-LP (On Order)
Surrounds: 2 x JTR 210HT (On Order)
Amplifier: DAC 5-Cherry
Processor: Monolith THX AAA Desktop DAC/AMP (Temporary until Monolith HTP-1 arrives)
pitchcut29 is offline  
Sponsored Links
Advertisement
 
post #4 of 8 Old 08-25-2019, 11:14 AM - Thread Starter
AVS Forum Special Member
 
Tom Vodhanel's Avatar
 
Join Date: May 2011
Posts: 4,828
Mentioned: 119 Post(s)
Tagged: 0 Thread(s)
Quoted: 3005 Post(s)
Liked: 10125
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 8 Old 08-25-2019, 11:15 AM - Thread Starter
AVS Forum Special Member
 
Tom Vodhanel's Avatar
 
Join Date: May 2011
Posts: 4,828
Mentioned: 119 Post(s)
Tagged: 0 Thread(s)
Quoted: 3005 Post(s)
Liked: 10125
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 8 Old 08-25-2019, 11:57 AM
AVS Forum Special Member
 
Nalleh's Avatar
 
Join Date: Aug 2014
Location: Norway
Posts: 3,629
Mentioned: 304 Post(s)
Tagged: 0 Thread(s)
Quoted: 2510 Post(s)
Liked: 3376
^^ 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" - 8xJBL 12" BOSS - 4xJBL 12" w/SLAPS M12" 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 8 Old 08-25-2019, 04:23 PM
Senior Member
 
powerdubs's Avatar
 
Join Date: Dec 2011
Posts: 279
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 199 Post(s)
Liked: 128
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 offline  
post #8 of 8 Old 08-26-2019, 03:55 PM - Thread Starter
AVS Forum Special Member
 
Tom Vodhanel's Avatar
 
Join Date: May 2011
Posts: 4,828
Mentioned: 119 Post(s)
Tagged: 0 Thread(s)
Quoted: 3005 Post(s)
Liked: 10125
Size perspective shot. Makes a good MT110 stand.


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

Name:	pr_pic3.JPG
Views:	54
Size:	140.9 KB
ID:	2607568  

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