2242H Subs for Big Bass

[scott fitlin]

I don't think spikes are going to work with the weight you are dealing with unless you use a bunch of them.

4 spikes, 1 per corner isnt enough?

The spikes will be sitting on a wood floor, isnt the theory about coupling the cabinet to the floor, and the weight of the cabinet being concentrated via the spikes to such a small area, supposed to actually make the cabinet and floor one?

[4313B]

Yeah but you are dealing with a 350 pound box. I guess you'll just have to try it. I'm sure there are spikes out there that can handle that weight, I just don't know of any. I used six per 4430. Three across the front and three across the back. I'd put steel discs underneath them otherwise they'll just dig into the wood or concrete floor over time.

[scott fitlin]

Yeah but you are dealing with a 350 pound box. I guess you'll just have to try it. I'm sure there are spikes out there that can handle that weight, I just don't know of any. I used six per 4430. Three across the front and three across the back.

400lbs, loaded! Then, 2 cabinets stacked = 800lbs.

Its lighter than the 1000lbs of two J Horns!

But, spikes up to the task of supporting 800lbs may present a bit of a problem!

I guess the ones parts express have wont be robust enough?

I could have custom milled larger and heavier duty than normally available made for me at a machine shop. OTOH, they make spikes for things like Wilson Grand Slamms, and they weigh in big time, so somebody makes something for this kind of weight, somewhere!

[Robh3606]

Use a machine bolt like a 3/8 and have the tips shaped the way you like. That should handle the weight.

Rob

[scott fitlin]

I have two local machine shops here, anything I need can be fabricated!

[edgewound]

Spikes are meant to isolate or decouple the speaker enclosure from the floor and the room structure, and rigidly keep it in place so it doesn't "walk" around. If you want it to "become one" with the floor...set it on the floor.

[scott fitlin]

I guess I have a bit of experimentation ahead of me.

Play with this, play with that, set it up one way, space em this way, whatever sounds best wins.

Thanks, everyone, for all the helpful tips and info.

[Zilch]

Spikes are meant to isolate or decouple the speaker enclosure from the floor and the room structure, and rigidly keep it in place so it doesn't "walk" around. If you want it to "become one" with the floor...set it on the floor.

I asked the question whether the intent of spikes was to couple or decouple from the floor several months ago:

http://audioheritage.org/vbulletin/s...140&#post84140

Can't say I understand it yet....

[edgewound]

I asked the question whether the intent of spikes was to couple or decouple from the floor several months ago:

http://audioheritage.org/vbulletin/s...140&#post84140

Can't say I understand it yet....

It would be exactly the same as vibration-isolation of heavy machinery on a factory floor. With speakers it's to prevent audio smearing from floor/wall vibrations interacting with the sound waves.

[Earl K]

I asked the question whether the intent of spikes was to couple or decouple from the floor several months ago:

http://audioheritage.org/vbulletin/s...140&#post84140

Can't say I understand it yet....

- Two Schools of thought are at play here .
- Both are committed to reducing "audio smearing" .
- Permit my paraphrasing of the lessons I think I've learned .

(#1) Drain excess energy into something that has more mass ( ie; through spikes into a solid floor ) . I believe that people like Jean ( B&K man ) / Giskard / Steve Schell ( he's a piano tuner ) subscribe to this approach. If I was doing either of the two , this is what I would try first . ( I hope the name attachments are correct and not out of line ).

(#2) Contain ( isolate ) excess energy within the device producing it. A person like Jean will tell you that this approach can lead to signal "bloom" ( because the excess energy can't go anywhere ). I would say, this approach only works up to a certain db level and then physics takes over as the whole "sheebanng" wants to levitate itself .

Those are my thoughts ( as gleaned from others ) <>

[loach71]

Best practice is one driver per volume. We've gone over this dozens of times.

What is the specific reason?

[scott fitlin]

OH BOY!

Going to JFK to pick up the subs, they will be in my possesion in an hour or two!

Todays Wedensday, should have em working by tomorrow, move some air this weekend!

We even got the good truck with the big liftgate. 2000lbs? Feh, no problema.

[edgewound]

Careful with those big guns, Scotty.

I have a feeling we'll be feeling your tremors out here on the "other side"

[John]

I know we had some at the start of this thread but I need more, much more!!! Scott buy a camera please.

[4313B]

What is the specific reason?

Minimize transducer interaction. It's a "best practice" as opposed to a deal breaker or show stopper. Sometimes you gotta do what you gotta do.