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Adjustable Spring Bass Traps

If a standard basket / cone speaker can produce a certain frequency, can the same design collect a certain frequency?

I want to design an "Adjustable Spring Bass Trap", with passive radiators as the collectors..  I need to do some tinkering.

We use to call something that took vibration and surge out of hydraulics an accumulator or better known as a shock absorber.

I have a pair of 12 cubic foot columns 1.5" thick 60 x 22 x 18".

I have 8 12s, 4 15s and 4 18" high excursion radiators. I think 1 12, 1 15" and 1 18" will do the job.

I think if they were concave with no dust cap or inverted dust caps that would improve collection.

Do I port the the passive radiator? Seems weird to port a port, or will the box just collect bad BASS so to speak?

Do I hang dingle berries inside to dampen the "BAD BASS"? I'm thinkin', I think.. Could just be my OCD kickin'

1/2" rubber rope inside going through eyelets, 20 or 30 will do. Terminate the rubber rope with hog rings or zip ties.
Can I adjust the rubber rope to collect "Bad Bass" too?

An IB design, a ported design, and active design, that uses an active speaker to react to "BAD BASS"?

Me the dog and the rabbit (Junior) got an idea, I haven't let the chickens in on yet.. 

What do you think? 
oldhvymec

Showing 8 responses by oldhvymec

oldhvymec OP
5,101 posts
 
What about a sub with a spring bass trap built in?

Oh no name callin’ other than the normal name callin’, just sayin’

Regards
oldhvymec OP
5,101 posts
 
I've seen subs that double fire. Isobaric, and daisy chained.  The active driver on the inside of the chamber is fired out of phase.. They dig pretty DEEP.. Face to Face in an open baffle is pretty impressive too.
It's always the same with bass, distortion. Not hard to make a lot of BASS but GREAT bass in a room is tough... Back walls are BAD.. Retracting walls? 007 stuff...

Regards
oldhvymec OP
5,101 posts
 
Maybe springs on the French doors will work as a poor mans substitute. Besides they are already there..:-)

I'm not trying to "catch it all", BUT I would like to make a dent in the frequencies I'm trying to work with. 45-55, 75-85, 115-125, 250 (?)
pretty normal bumps and valleys. The 250 up is pretty easy. Wall panels but below 125 hz... and a fairly easy to make trap? Not to darn ugly.. Just ugly enough..

A guy was making exactly what I wanted BUT he quit making the ONE trap I really liked.. Naturally!! I think the proper term is SOL.. LOL

With me any more 15 min 3 times a day.. My hand quit.. Twist up like pretzels (sp), silly things.. I can get a lot done in 45 min. though..

I wonder if a sail mounted to a box, or a collection horn into a dampened box? Or into water? LOL turn sound into bubbles? Why not..

Regards
oldhvymec OP
5,101 posts
 
I’ll look I’ve found two types that are adjustable.

One of them only does one frequency at a time and takes 6-8 for 2400 CF. That’s a typical 300 foot floor X 8 foot ceiling. A lot of listening rooms are close to that..

The second one I found does 3 frequencies but the guy QUIT making them... 900.00 a pop too. Two would have worked perfect with a few wall panels two 6 foot HEAVY drapes (floor to ceiling) on the side walls and a rear wall mods (2 x 36" French doors) opened and HEAVY corner drapes drawn to cover the doors faces.. The panes of glass actually work pretty good.. High ten glass 6 x 8 pains with actual mahogany hard wood dividers for 16 panes.

Down to making corner adjustable traps or MAKING something for sure..

The 12CF subs got some HUGE sides... 60H x 18W x 22D. 4 actually.

I know there is a way to make GREAT muffler for Gods Sakes.. I’m a mechanic.. I can sure make noise.. NOW to quiet STUFF down.

Besides I’m still thinking vent the noise into water. The bubbles can double as an antistatic reducer and moisture therapy for my lungs.. :-)

Back to Murdock Mysteries

Regards
oldhvymec OP
5,101 posts
 
That's the purpose of the adjustable spring bass traps. 125 hz and <

As far a DBA or Swarm they are the bandaids. The whole reason they were developed to begin with. I got away from multi subs a long time ago 20 plus years now..  I use 2 sometime 3 OB dual servo subs with full blown DSP controlled MB columns. There is not a gear issue ONLY a room issue. I confess...:-)

It is an easy way to even out the peaks and valleys BUT still not the best.

I like a servo sub system with Narrow MB and Monitor columns. There is no need for BASS everywhere, when it's RIGHT there.. A lot of the nulls are corrected by MB column placement.  The servo software is pretty good BUT it is software none the less.. Just like the DSP.. Not all DSP software is created equal. I use a Behringer 2496 for all the BASS management.. Easy peasy.. Active sound management, I just use it for 300 hz and down.. 300 hz up its all passive.

This is the PRE check list for a front room. Not the main room but it is my main listening room for now.. Paint, floors and drapes. They are going to be made. CLOSE.. Drapes and traps. of course there is a phono stage on the way.. 3 more months.. I'm cutting it close..

Thanks for your input though, rhljazz
oldhvymec OP
5,101 posts
 
Not to compress ausaudio As a muffler.. as a filter.. You ever see a water muffler?

What about WET stacks on marine diesels? You'll have to trust me on this one.. A pair of V12 Cats in a tug, can get LOUD (130+ db) yet quiet as a mouse with water muffs..130+ db easy uncorked.

I use to work on Hydro-blasters.. 15,000 psi HP water jets. Water does not compress.. LOL BUT is sure quiets things down, and it transfers SOUND pretty dog on well, too. 

Those noisy POS used 6V53 Detroit (2 cycle diesels) with "WATER" mufflers installed into 3000 gallon scrubbers. Noise and Opacity test requirement, because of the location. You had to keep a 25 foot distance between you and the scrubber, too. The harmonics would crumble your bones..

Hydro water plants are the same way.. 15-30 minutes exposure, your DONE. Turbine growl is a bone grinder.

It's easy to fix stuff (Gas Monkey Garage). UNDERSTANDING what it does and is doing is another thing..

I need BASS mufflers, yup Dual INTAKE mufflers :-)

Old Heavy Master Mechanic, that gladly retired..

Regards
oldhvymec OP
5,101 posts
 
Put together a large array of noise canceling headphones modified with an adjustable low pass filter.

<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>

600 pairs of head phones. I'll head to the bank for a loan. What should I say I need the money for? I need 100K for my ??K system to add headphones.. "LOAN DENIED" LOL Big ol' red letters..

Start looking like Master Ms digs, with his "enbeddings", love that guys way of tinkering.. :-)

Regards
oldhvymec OP
5,101 posts
 
How cool is that.  I use to use AC and DE in HUGE water filtration systems.. 12,000 gallon filters. We uses two frack tanks as holding and settling cells. That is when I learned about concrete and it ringing like a bell.

It took quite a few super sacks of AC to fill the two 5000 gallon stainless steel filters. It cost 15k 30 years ago for 15 super sacks. Had to turn in a core carbon too, or the price almost doubled..

I wonder how thick it has to be to BE effective? I'll check it out..

Regards
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