Simplest, smallest subsonic filter? - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 
Thread Tools
post #1 of 7 Old 04-06-2019, 01:40 PM - Thread Starter
Senior Member
 
rr14's Avatar
 
Join Date: Dec 2011
Posts: 442
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 110 Post(s)
Liked: 31
Simplest, smallest subsonic filter?

Hi all,

I have a 270 watt amp pushing a 10" sub for theater/tv use. I don't have enough space to nearly port the woofer low enough as i'd like, so I'm considering a subsonic filter. Something to plug in between my receiver and amp. Any simple suggestions? I'm thinking about 30 or 35hz.
rr14 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 04-06-2019, 01:57 PM
Senior Member
 
Join Date: Nov 2015
Posts: 280
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 121 Post(s)
Liked: 121
Quote:
Originally Posted by rr14 View Post
Hi all,

I have a 270 watt amp pushing a 10" sub for theater/tv use. I don't have enough space to nearly port the woofer low enough as i'd like, so I'm considering a subsonic filter. Something to plug in between my receiver and amp. Any simple suggestions? I'm thinking about 30 or 35hz.
you can do a fmod but they are only 12db per octave.

https://www.parts-express.com/harris...s-rca--266-248
stngray72 is offline  
post #3 of 7 Old 04-06-2019, 02:03 PM - Thread Starter
Senior Member
 
rr14's Avatar
 
Join Date: Dec 2011
Posts: 442
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 110 Post(s)
Liked: 31
thanks. quick, easy and small. Probably not 100% ideal, but definitely should offer some protection.
rr14 is offline  
Sponsored Links
Advertisement
 
post #4 of 7 Old 04-06-2019, 02:06 PM
AVS Forum Special Member
 
holl_ands's Avatar
 
Join Date: Jun 2004
Location: San Diego, CA
Posts: 6,147
Mentioned: 35 Post(s)
Tagged: 1 Thread(s)
Quoted: 931 Post(s)
Liked: 505
I read you post to mean that you are looking for a BASS BOOST Filter...rather than a Filter to suppress Bass Freqs....


Rather than JUST Boost (say) 35-Hz, I would highly recommend that you consider a 1/3-Octave Band Filter Equalizer so that you can adjust ALL of the Frequency Bands going to your Sub-Woofer(s). Many AVR's do NOT have a sufficient number of Room Equalization Filters in this region to get the job done [you didn't say if you had this capability...which may be a good start]. Depending on room dimensions, there WILL be a Primary Room Mode (BOOST) at about 40-60 Hz and a Secondary Room Mode at twice that Frequency...which requires two BASS CUT Filters. The Null in-between those Freqs as well as Freqs below the Primary Freq require BASS BOOST Filters....plus one above the Secondary Frequency. That's a total of two BASS CUT and three BASS BOOST Filters (minimum). The fol. 1/3-Octave Band Filter Equalizer provides at least SEVEN Filters for the Frequencies going to the Sub-Woofer. It provides two channels so that you could independently equalize TWO Sub-Woofers when you decide you want to upgrade:
https://www.amazon.com/Rockville-REQ.../dp/B01LZL8LGT [$99 on Amazon]


FYI: A LOT more about Room Equalization:
https://www.avsforum.com/forum/113-s...l#post54537820
holl_ands is offline  
post #5 of 7 Old 04-06-2019, 02:08 PM - Thread Starter
Senior Member
 
rr14's Avatar
 
Join Date: Dec 2011
Posts: 442
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 110 Post(s)
Liked: 31
I'm looking to cut frequencies below 30hz to protect my woofer in a ported box.
rr14 is offline  
post #6 of 7 Old 04-07-2019, 09:07 AM
AVS Forum Special Member
 
keeper's Avatar
 
Join Date: Aug 2005
Posts: 1,714
Mentioned: 17 Post(s)
Tagged: 0 Thread(s)
Quoted: 601 Post(s)
Liked: 247
Quote:
Originally Posted by rr14 View Post
I'm looking to cut frequencies below 30hz to protect my woofer in a ported box.
This is also a question that I have. The cheapest option seems to be the old minidsp the non hd for around $100. I believe you can set the subsonic filter on that but I’m not sure how easy it is to learn/do.
keeper is online now  
post #7 of 7 Old 04-07-2019, 11:09 AM
Senior Member
 
CrusherW9's Avatar
 
Join Date: Apr 2016
Location: Central Iowa
Posts: 344
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 206 Post(s)
Liked: 116
A subsonic filter is just a high pass filter. Very easy to do on a MiniDSP. Regarding those FMODs, if you want a 24db/octave high pass you could just use two of those in a row.

"Becoming educated is more than just acquiring knowledge. It involves the ability to see the world in ways never before conceived."
CrusherW9 is offline  
Sponsored Links
Advertisement
 
Reply DIY Speakers and Subs

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