Sealed Sonotube Subwoofer - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #1 of 13 Old 08-30-09, 09:55 PM Thread Starter
Shackster
pedalnote
 
Join Date: Jun 2009
Location: Los Altos Hills, CA
Posts: 7
Sealed Sonotube Subwoofer

Hi All,

I'm a new member and most interested in tapping what is evidently a great deal of expertise in all things audio. I am planning on building a downward firing, sealed sonotube subwoofer of approximately 1.8 cu.ft. with stuffing and using the Dayton RSS315-4 12in. driver and either the Dayton 240 or 500 watt plate amp. This will augment my Monitor RSI Sliver bookshelves and is for a music only system. Will the 500 watt be that much better than the 240 given that it has EQ but is $140 more? I'm not looking to rattle any windows but would like to get down to at least 32 Hz for an organ pedal note. WinISD generates an F3 of approximately 36 Hz and down 5db at 30Hz. Do I need a 3 in. gap for the speaker to endplate or could I go 2 in? My dimensions are all space constrained. The speaker will be placed in a corner of a 14X14X10 ft. room so don't know how much bass enhancement this will provide. This is my first diy subwoofer so would be pleased to hear any comments pro or con or any advice about my plan.
hsturiale is offline  
Sponsored Links
Advertisement
 
post #2 of 13 Old 08-31-09, 07:16 AM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: Sealed Sonotube Subwoofer

Which RSS315-4 are you referring to? There is a HF and a HO model.




We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
post #3 of 13 Old 08-31-09, 04:50 PM Thread Starter
Shackster
pedalnote
 
Join Date: Jun 2009
Location: Los Altos Hills, CA
Posts: 7
Re: Sealed Sonotube Subwoofer

Sorry about the omission. The speaker is the 12 in. Dayton RSS315HF-4.
hsturiale is offline  
 
post #4 of 13 Old 08-31-09, 05:19 PM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: Sealed Sonotube Subwoofer

Yellow is with a 240 watt amp maxed out to the point of clipping. Pink is with a O-Audio 500 watt amp with the Hi-Pass filter set at 20 hz and with the 4 db of boost at 20 hz that comes with it. The O-Audio amp would have 3 db of head room and would be a much better match for your needs.

The O-Audio amp is $229 with free shipping.

http://www.oaudio.com/500W_SUBAMP.html


Sealed Sonotube Subwoofer-amps.jpg




We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
post #5 of 13 Old 08-31-09, 09:58 PM Thread Starter
Shackster
pedalnote
 
Join Date: Jun 2009
Location: Los Altos Hills, CA
Posts: 7
Re: Sealed Sonotube Subwoofer

Hi Mike,

Thanks for the input. I will reconsider the amp. I do like the 4db boost. I was considering the Dayton 240 watt amp with the 6db boost at 30 Hz but was concerned about introducing a bit of a boom or peak in the bass with no way to modify it. I presume you think this Bash amp is better than the Dayton 500 watt unit. What program did you use to chart the output? I am gung ho to get this going and will report on the building progress if you like.
hsturiale is offline  
post #6 of 13 Old 09-01-09, 12:18 AM
Elite Shackster
 
robbo266317's Avatar
bigbadbill
 
Join Date: Sep 2008
Location: Newcastle Australia
Posts: 5,771
Re: Sealed Sonotube Subwoofer

It's freeware called Win ISD a quick search will find it

Silence is golden but duct tape is silver.

DIY completed:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
robbo266317 is offline  
post #7 of 13 Old 09-01-09, 12:35 AM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: Sealed Sonotube Subwoofer

I mentioned the O-Audio amp due to its slightly lower cost, the Dayton 500 watt amp would perform just as well.

Quote:
What program did you use to chart the output?
As stated above, the program is WinISD Pro. There is a tutorial on it here:

http://www.hometheatershack.com/foru...inisd-pro.html

Quote:
I am gung ho to get this going and will report on the building progress if you like.
Yes, please document your build with pics. It will be added to the "Subwoofer Database".




We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
post #8 of 13 Old 12-26-09, 07:46 PM Thread Starter
Shackster
pedalnote
 
Join Date: Jun 2009
Location: Los Altos Hills, CA
Posts: 7
Re: Sealed Sonotube Subwoofer

Unfortunately had to delay starting my subwoofer incorporating the appreciated advice from this forum, but back in the saddle again. I am going with a 14 in. or 16 in. downward firing sealed sonotube, the 12 in. Dayton RSS HF315-4 and the Bash 500 watt amp. I have a 24 in. overall height limitation so looking at an approximate enclosure volume of between 25 and 40 liters subracting the caps and stand. In modelling with Win ISD I found virtually no difference in the frequency response between these two volumes. At 25 liters it is -3db at 37.5 Hz and -3db at 37.7. The same close results are the same at -2db and -4db. The shape of the curve does not change much. What am I doing wrong? There also does not seem to be any difference if the tube is flat and short or skinny and tall. Would sure appreciate some guidance.
hsturiale is offline  
post #9 of 13 Old 12-26-09, 07:54 PM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: Sealed Sonotube Subwoofer

Since this is for music only you'll want an enclosure size that gives a Qtc of .7 which is considered best for music.




We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
post #10 of 13 Old 12-26-09, 10:37 PM Thread Starter
Shackster
pedalnote
 
Join Date: Jun 2009
Location: Los Altos Hills, CA
Posts: 7
Re: Sealed Sonotube Subwoofer

Hi Mike,

A Qtc of .7 in WinISD calls for a volume of 181 cu in. With a 12 in. sub driver how do you make an enclosure this small? I have read that a lower Qtc than .7 reduces low frequency output but putting in volume values higher than 181 at least up to 1500 cu in. flattens the curve and gives a higher output at lowest frequences. What am I doing wrong?
hsturiale is offline  
Reply

Bookmarks

Tags
sealed , sonotube , subwoofer

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










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



Posting Rules  
You may post new threads
You may 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 is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome