-

Jump to content



Photo

Double Checking Measurements for Sonosub


This topic has been archived. This means that you cannot reply to this topic.
13 replies to this topic

#1 of 14 OFFLINE   ChristopherJ

ChristopherJ

    Extra

  • 23 posts
  • Join Date: Dec 10 2000

Posted February 23 2001 - 02:39 PM

I was wondering if some of the experienced Sonosub builders wouldn't mind double checking my calculations.

24" Diameter Tube
26" Internal Height
15" Adire Audio Tempest Subwoofer
22" long and 4" wide Precision Flared Port (from end to end)
Samson S700 Amplifier with one voice coil to each channel running in Parallel.
16-17 Hz tuning frequency as the goal.

Other odds and ends info:
3 layers of 3/4" MDF on top endcap with 2 layers internal.
2 layers of 3/4" MDF and 1 layer of 3/4 plywood on bottom endcap.
Tube will be lined with 1/2-1" of pollyfill around the sides (should the bottom of the top endcap be lined as well?)

Please let me know if the numbers add up correctly!

Chris

P.S. I am waiting for the terminal cup as it was accidentally left out of the shipment when my Tempest was sent. I feel like a crack addict with everything but the lighter!!!!!!!!!! Posted Image


#2 of 14 OFFLINE   Patrick Sun

Patrick Sun

    Studio Mogul

  • 37,785 posts
  • Join Date: Jun 30 1999

Posted February 24 2001 - 03:54 AM

Looks great, go for it, Christopher. Just be aware it's not totally flat to 20Hz, but it will be more than adequate. If you could find a way to go for a little larger sub, you could flatten out your frequency response a little more, but then again, I don't know what your emphasis is on: music or HT.

------------------
PatCave ; HT Pix ; Gear ; Sunosub I + III ; DVDs ; LDs
"Jee-sus, it's like Iwo Jima out there" - Roger Sterling on "Mad Men"
Patcave | 2006 Films | 2007 Films | Flickr | Comic-Con 2012 | Dragon*Con 2012

#3 of 14 OFFLINE   ChristopherJ

ChristopherJ

    Extra

  • 23 posts
  • Join Date: Dec 10 2000

Posted February 25 2001 - 03:29 PM

I completed my sub but it is not as loud as I hoped. It sounds cleaner and the wife beleives so too. Unfortunatyly, I cannot get it to teeth ratling levels without blowing my eardrums. Any suggestions?

#4 of 14 OFFLINE   Jack Gilvey

Jack Gilvey

    Producer

  • 4,952 posts
  • Join Date: Mar 13 1999

Posted February 25 2001 - 03:49 PM

Quote:
Unfortunatyly, I cannot get it to teeth ratling levels without blowing my eardrums.
You're blowing your eardrums, and complaining it's not loud enough? What am I missing?

------------------
http://content.commu....&ID_Message=40

I prefer to listen to my music in its Original Aspect Ratio: Stereo.


SVS Customer Service
http://www.svsound.com
sales@svsound.com
techsupport@svsound.com

#5 of 14 OFFLINE   ChristopherJ

ChristopherJ

    Extra

  • 23 posts
  • Join Date: Dec 10 2000

Posted February 25 2001 - 04:01 PM

That does look rather odd. What I meant was that I have to turn the systems volume so loud that the main speakers make my ears ring. Only then do I get to a subwoofer sound volume that is acceptable.

#6 of 14 OFFLINE   Patrick Sun

Patrick Sun

    Studio Mogul

  • 37,785 posts
  • Join Date: Jun 30 1999

Posted February 25 2001 - 04:09 PM

(I posted this on the other forum as well.)

Looks like your receiver is the culprit. Is it a DPL receiver only? It doesn't output a true LFE or subwoofer signal, does it? How are you getting the signal to power the subwoofer's amp? Have you calibrated your HT system? (probably tough to do if you don't have a 5.1 receiver).


------------------
PatCave ; HT Pix ; Gear ; Sunosub I + III ; DVDs ; LDs
"Jee-sus, it's like Iwo Jima out there" - Roger Sterling on "Mad Men"
Patcave | 2006 Films | 2007 Films | Flickr | Comic-Con 2012 | Dragon*Con 2012

#7 of 14 OFFLINE   Jack Gilvey

Jack Gilvey

    Producer

  • 4,952 posts
  • Join Date: Mar 13 1999

Posted February 26 2001 - 12:00 AM

Quote:
What I meant was that I have to turn the systems volume so loud that the main speakers make my ears ring. Only then do I get to a subwoofer sound volume that is acceptable.
I see. Well, it's tough to say with that little information, but have you got the gain maxed on the Samson and on your receiver's subwoofer output?

------------------
http://content.commu....&ID_Message=40

I prefer to listen to my music in its Original Aspect Ratio: Stereo.


SVS Customer Service
http://www.svsound.com
sales@svsound.com
techsupport@svsound.com

#8 of 14 OFFLINE   Oliver

Oliver

    Stunt Coordinator

  • 104 posts
  • Join Date: Feb 28 1999

Posted February 26 2001 - 11:02 AM

Christopher:
Can you give me the Thiele-Small Parameters of the sub,
I would like to do my own calculation to see where something went wrong.
Or maybe a link where I can find those.
Thanks,
Oliver.

#9 of 14 OFFLINE   ChristopherJ

ChristopherJ

    Extra

  • 23 posts
  • Join Date: Dec 10 2000

Posted February 26 2001 - 12:49 PM

Jack: The amp is set at it's max and the subwoofer outpoot is at the max as well.

Oliver: I haven't the slightest idea what the Thiele-Small Parameters of the sub are. Where/how would I get that?

Thanks for your help!

#10 of 14 OFFLINE   Jack Gilvey

Jack Gilvey

    Producer

  • 4,952 posts
  • Join Date: Mar 13 1999

Posted February 26 2001 - 02:40 PM

I'm at a loss,then. Sorry.

Oliver,here's the .pdf white paper for the Adire Tempest . The T/S are in there somewhere.

------------------
http://content.commu....&ID_Message=40

I prefer to listen to my music in its Original Aspect Ratio: Stereo.


SVS Customer Service
http://www.svsound.com
sales@svsound.com
techsupport@svsound.com

#11 of 14 OFFLINE   Greg Monfort

Greg Monfort

    Supporting Actor

  • 884 posts
  • Join Date: May 30 2000

Posted February 26 2001 - 02:54 PM

>What I meant was that I have to turn the systems volume so loud that the main speakers make my ears ring. Only then do I get to a subwoofer sound volume that is acceptable.
====
Are you saying you can't set the mains output independently from the sub? If so, you're in trouble because the mains are supposed to be 10dB lower than the sub in playback.

GM

------------------
Loud is beautiful, if it's clean
Loud Is Beautiful, If It's Clean

#12 of 14 OFFLINE   ChristopherJ

ChristopherJ

    Extra

  • 23 posts
  • Join Date: Dec 10 2000

Posted February 26 2001 - 03:33 PM

Actually, I can't adjust the mains volume. I just discovered this tonight. I thought I was adjusting the level but it had absolutely no effect on the volume. I may have to borrow my dad's Denon 3300 to see if it makes a difference. Thank you for the input...any other sugestions?

#13 of 14 OFFLINE   Patrick Sun

Patrick Sun

    Studio Mogul

  • 37,785 posts
  • Join Date: Jun 30 1999

Posted February 26 2001 - 04:12 PM

Unless you are able to hook up front main speaker-level inputs through the subwoofer amp (so that it'll filter the low frequency material to the sub's amp) and back to your front speakers, I think you'll be having problems getting good bass output from the sub. This is due to your receiver not having bass management.

But, I'm surprised that your DVD player's 5.1 output circuitry isn't doing a good job on the bass management for the DVD source material. I never did like using a "5.1-ready" receiver to get your sub working in concert with the rest of the speakers. It's much more convenient to use a receiver which has 5.1/6.1/7.1 processing capabilities, and use the bass management feature to produce a good hearty subwoofer output for the sub's amp to fully exploit for some heart thumping bass.

If you play just stereo material through your receiver, you won't get much bass at all (unless you want to expound on how you have the bass output signal connected to the subwoofer amp).

I'm sure your dad's Denon 3300 will allow you the bass management features that will make your sub woof all night long.


------------------
PatCave ; HT Pix ; Gear ; Sunosub I + III ; DVDs ; LDs
"Jee-sus, it's like Iwo Jima out there" - Roger Sterling on "Mad Men"
Patcave | 2006 Films | 2007 Films | Flickr | Comic-Con 2012 | Dragon*Con 2012

#14 of 14 OFFLINE   ChristopherJ

ChristopherJ

    Extra

  • 23 posts
  • Join Date: Dec 10 2000

Posted February 26 2001 - 04:34 PM

Thank you for the input. Since my parents are on vacation, I can "borrow" it this week and try it out. I 'll let everyone know what difference it makes...darn, I hope this doesn't mean that I will have to go out and buy a new receiver. Posted Image





Forum Nav Content I Follow