Subwoofers

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Jack D.

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Subwoofers
« on: 21 Feb 2006, 06:43 pm »
Hey guy's,

I've noticed, in photo's of the C.E.S./The Show as well as John Casler's
set-up, the subwoofers are positioned on their side.

Why?

woodsyi

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Subwoofers
« Reply #1 on: 21 Feb 2006, 07:12 pm »
They seem to sound better that way.  Here is what I posted right after I got back from JC's place in LA. http://www.audiocircle.com/index.php?topic=21114

John Casler

Re: Subwoofers
« Reply #2 on: 22 Feb 2006, 12:40 am »
Quote from: Jack D.
Hey guy's,

I've noticed, in photo's of the C.E.S./The Show as well as John Casler's
set-up, the subwoofers are positioned on their side.

Why?


Hi Jack,

Bass, as we all know is a funny animal depending on the cage (room) we let it run free in.

I think it is well known that sometimes changing the way certain frequencies are launched into a room will allow us to hear them differently.

VMPS subs are "by design" generally going to work best with the Sub sitting on the floor, and placed in a strategic point in the room that causes the "least" interaction.

That said, very few rooms are perfect for bass, as a matter of fact, if it "IS" a room with walls, you can bet it is "imperfect" at some, if not many frequencies.

So many find it fun and rewarding to "tweak" their SUBs by changing or altering the "orientation" "postition" or even altering it physically, to change the "response" within that room.

What I use, may not work for you and vice versa, since my room, and walls are different than yours.

To begin, the CES vertical orientation was more a "function" of the amount of space we had, than the best sound.  Actually, the subs were dialed down so low that they many times were off, and no one noticed.

My front LARGERs which were placed on the floor.  The Passive Radiator Plate had been removed and the PR's were firing out (away from the mains) when Woodsyi was here,

They are now sitting on 16" stands with the PR firing to the rear (with the slot plate in place to direct the LOW BASS rearward.

So the best advice is to be adventurous and aggressive in placement and orientation.

I already have two more ideas, I'm looking forward to trying.

Seems like each one has its own new set of virtues and sometimes limitations.

I will be posting a simple tweak soon that is simply a "try it" and see what it does for your room, and sound type tweak.

Jack D.

  • Jr. Member
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Subwoofers
« Reply #3 on: 22 Feb 2006, 11:07 am »
Thanks Guys,

It just seems odd because, without the floor as a boundary
those subs are no longer slot loaded.

I thought the slot loaded PR was a key design feature in
most VMPS speakers.

John Casler

Subwoofers
« Reply #4 on: 22 Feb 2006, 03:58 pm »
Quote from: Jack D.
Thanks Guys,

It just seems odd because, without the floor as a boundary
those subs are no longer slot loaded.

I thought the slot loaded PR was a key design feature in
most VMPS speakers.


Hi Jack,

That is true and "in general" the Sub will be the most effective when used in that orientation.

But it is not uncommon to see experrimentation to a good result.  For example, I have seen several "down firing" subs facing vertically to good result.

Bass has a wave length that causes more of an omnidirection travel or disturbance of "ALL" the air around the driver and cabinet.  Even the air behind, and above the cabinet is set in motion, as opposed to a more focused beaming as the frequencies rise.

If your room dimensions are such that the frequncies between the main drivers and the PR "excite" or "reduce" that area, a slightly different origination point to the wave can sometimes "help" that overlapping area, by making the main pressure path slightly longer.

On top of that, it is fun to play with your toys on occasion to see what they'll do, in your sandbox. :lol:

J

  • Jr. Member
  • Posts: 34
Subwoofers
« Reply #5 on: 25 Feb 2006, 03:29 pm »
Any other info on this? Seems like if the PR were to fire to the rear you could get by with a smaller box . (or use the extra room by not having a slot to increase internal volume?)

John Casler

Subwoofers
« Reply #6 on: 25 Feb 2006, 03:42 pm »
Quote from: J
Any other info on this? Seems like if the PR were to fire to the rear you could get by with a smaller box . (or use the extra room by not having a slot to increase internal volume?)


Hi J,

The slot has a loading/impedance function I beleive.

Since I am not a speaker builder/designer only B, could answer that pertaining to VMPS.