Jump to content

Sign in to follow this  
Mike13

How to pressurise a room

Recommended Posts

Can anyone help with this?

 

It’s done by subs from what I’ve been told. I have two Rel T9i’s but I don’t feel like it is pressurised. Do I need bigger/more subs?

 

My room is 10L x 4.3W x 3H with a L-shaped kitchen section that’s 3 x 3.8 x 2.

 

149.2 cubic metres (5269 cubic feet).

 

Is there a rough formula for sub size and output to cubic metres?

 

Thanks!

Edited by Mike13
clarification

Share this post


Link to post
Share on other sites

You need to seal a room to pressurise it. Your room is massive with a kitchen also so I doubt it's possible unless you buy bulk 18 inch subs.

Share this post


Link to post
Share on other sites
1 hour ago, Mike13 said:

Can anyone help with this?

 

It’s done by subs from what I’ve been told. I have two Rel T9i’s but I don’t feel like it is pressurised. Do I need bigger/more subs?

 

My room is 10L x 4.3W x 3H with a L-shaped kitchen section that’s 3 x 3.8 x 2.

 

149.2 cubic metres (5269 cubic feet).

 

Thanks!

It's not a pi55ing contest but I have a similar but slightly bigger room also with a hall running off it. I can hear my single Rel S3 which is in a corner to get some boundary gain, but I certainly don't feel the sub, but I do feel bass in my adjoining 6x4m HT with twin subs, but I don't listen to music in there except for bluray concerts.

Edited by blybo

Share this post


Link to post
Share on other sites

Thanks @blybo. Your post in Darren’s thread was what prompted me. Can you hear a big difference when pressurised in your HT?

Share this post


Link to post
Share on other sites


31 minutes ago, bjc said:

You need to seal a room to pressurise it. Your room is massive with a kitchen also so I doubt it's possible unless you buy bulk 18 inch subs.

Thanks bjc. 18” is pretty big.

Share this post


Link to post
Share on other sites

If you want to FEEL the bass, there are two things you might be talking about. One is tactile bass in the midbass - this occurs around 40 - 60 Hz and you tend to experience it more in movies where the bass tends to have much less compression, so it is more dynamic. The other is very low bass, which gives a sense of pressure but not so much impact and punch. Many people think they need 20 Hz extension or lower when it's actually the midbass punch they want. It's actually good news where that is the case, because that is much easier to achieve.

 

This was illustrated in a calibration session recently, where the client was surprised to find that this tactile experience came not from adding extension but rather removing a big midbass dip. In this case, it was caused by the room and the solution was multiple subs in the right locations.

 

There is no useful formula here because the situation is too complex. It's a trial and error process. Keep in mind that it's not just about how much fire power you need. It's also about where you put your subs and how they interact with your room.

 

 

Share this post


Link to post
Share on other sites
2 hours ago, Mike13 said:

Thanks @blybo. Your post in Darren’s thread was what prompted me. Can you hear a big difference when pressurised in your HT?

 

Hard comparison because it's set up for movies, not music. I find there is too much bass for music in my HT room but I can feel really low bass which is not so much heard as felt. I assume it is pressure waves I'm feeling. Our little friend @Red Spade Audio above positioned my subs for me a few years ago.

 

When the SVS PB2000 is really pumping I can also feel the puffs of air on my legs from 3m away 😜

Share this post


Link to post
Share on other sites

If you can I'd move your existing subs to nearfield first. Preferably directly behind (within 1mt) you but if not then either side of your seating position. I'm not sure if your subs are ported or sealed but nearfield imo is where it's at as they don't need to work half as hard for impact and the room is almost taken out of the equation. Corner loading is nice but I feel it bloats the sound (I've never measured it though) which is why I used 4 subs with 2 front and 2 rear. These were all sealed 12's with passive radiators. I've got my 4 18's now (2 more arriving soon) but they are still in the box until I build my HT again!
Suppose I should pull my finger out...

Share this post


Link to post
Share on other sites


sorry i am far from an expert but from my readings no 2x 10" subs will pressurise that size/shaped room. if you want to feel it in your chest then the rels go for some subs from peter at deep hz audio..and deep pockets.

 

or if you just want to get a bit more "feel" into your movies at a much reduced expense you could get some bass shakers.. sorry i am ducking the rocks that are being thrown.

 

dont knock em till you try em. they will make you think the subs are bigger than they are.. wont pound your chest but actually do what they say they do and are very cost effective (subject to aust dollar and any old avr with A+B switching will power them)

Edited by hopefullguy

Share this post


Link to post
Share on other sites

When done right you can feel your shirt flapping from the bass without hurting your ears or feeling uncomfortable.

Multiple subs really helps. I see in some of the newer HT setups they are even placing subs at different heights - often with at least one at almost ceiling height!

Much easier to pressurise the car!

Share this post


Link to post
Share on other sites
34 minutes ago, bjc said:

If you can I'd move your existing subs to nearfield first. Preferably directly behind (within 1mt) you but if not then either side of your seating position.

This I can do. Can also add a smaller 8”, not sure it would do much.

 

Build that theatre!

Share this post


Link to post
Share on other sites

@hopefullguy I’m more looking for music thanks.

 

@AudioGeek that’s what I’d like.

 

My corner positioning is a bit boomy. I’ve been meaning to move them out a bit. 

 

 

Share this post


Link to post
Share on other sites


I have a pair of SVS PC13 Ultras and could not pressurise my room, as it is open on one side and leads into other areas.  As I was never going to be able to seal the area (short of pulling the house down and starting again),

i overcame the issue by putting together a pair of couch kickers😀  4x12" drivers powered by an INuke3000.

 

Our couch sits immediately in front of these.  The 2 PC13's and these two are then combined using a MiniDSP 2x4HD and MultiSubOptimiser (MSO).

 

Nothing like a good kidney massage😁

 

P1030105.JPG.ccc1a21f71aae2e0b5a84d5e5d50fa0d.JPG

Share this post


Link to post
Share on other sites

@mcb nice. They look like a sub/speaker hybrid. 

Share this post


Link to post
Share on other sites

They are actually car subs, which some bright spark figured out made a good cost effective sub for HT.  They are now discontinued.  https://www.sonicelectronix.com/item_18918_Infinity-Reference-1262W.html  There was a long thread on AVS regarding them, which is where I got the idea from.  Not sure what the equivalent they are using now is.

Share this post


Link to post
Share on other sites
7 hours ago, Mike13 said:

but I don’t feel like it is pressurised

Even in a sealed room, you will not feel it unless it is quite low and loud.   Below the rooms lowest mode, a monopole subwoofer will 'pressurise' the room.

 

Paul's post above is on the money.

Share this post


Link to post
Share on other sites


Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...