fundamental frequncy cabinet design

[B-string]

I was talked into letting a techno boom,boom DJ use our PA ONCE at an outside gig. They spent too much on ecstasy and I didn't get reimbursed for the damaged drivers.

 

[AlexanderB]

Does not matter whether you care or not, will33. Loud, sub-40 Hz bass is a part of many music genres and many settings since many years, even if people here tend to parrot the "they are all highpassed at 40 (or 50!) Hz anyway" mantra over and over.
And do you know what, PA amps are now putting out 10 000 Watts and more from one or two rack spaces. Look at Powersoft K20 etc. Very good for pushing out 30Hz rumble at 140dB+...

 

[will33]

Does not matter whether you care or not, will33. Loud, sub-40 Hz bass is a part of many music genres and many settings since many years, even if people here tend to parrot the "they are all highpassed at 40 (or 50!) Hz anyway" mantra over and over.
And do you know what, PA amps are now putting out 10 000 Watts and more from one or two rack spaces. Look at Powersoft K20 etc. Very good for pushing out 30Hz rumble at 140dB+...

Yeah, I get it. Don't see much need for it, but I get it.

I could see dipping into the 30's for some stuff. I also think most people couldn't tell a dimes worth of difference if I fished around on a highpass knob between 20 and 30. If anything, it'd be more music and less rumble at the higher setting, but then we'd have to qualify what is music and what is just noise, and we may well disagree there too.

 

[B-string]

While it may fill a niche for sub 40Hz, for a performing band playing to the larger group with disposable income that grows tired of the ear fatigue. I don't see the relevance personally. JMHO.

 

[will33]

I was talked into letting a techno boom,boom DJ use our PA ONCE at an outside gig. They spent too much on ecstasy and I didn't get reimbursed for the damaged drivers.

Exactly. Anybody makes mention of that stuff and they're not getting anywhere near my stuff.

 

[Cirk]

Not without first handing you a briefcase with double the amout of cash it would take to replace your entire PA. And you alone make the call of whether they get it back. That's the only way you know they'll take care of your gear.

 

[Ric5]

Yup, I know I'm probably get beaten over the head for this, but please indulge my curiousity. I'm looking to build a cab (or biamped cab set) that will respond down to a fundamental drop A (about 25hz IIRC) without dropoff. Light enough and small enough for reasonable transport and able to fit through an average sized door. Loud enough for a medium sized gig. Watts are pretty cheap these days, so efficiency is somewhat negotiable.

I know the usual argument about the first harmonic will be used, but bear with me. It's just an experiment. All ideas are relevant here.

Thanks in advance for your input. I can make some pretty good beer, but designing cabs is not something I know a ton about. If you want to drop by for a brew, ask Zooberwerx for directions.

Maybe add a powered sub to your rig.

You can design your cab perfectly but then you need to make sure you put in a speaker that goes down to 25hz. Some subwoofer cabs and speakers only go to 40 or 50 hz

 

[will33]

While it may fill a niche for sub 40Hz, for a performing band playing to the larger group with disposable income that grows tired of the ear fatigue. I don't see the relevance personally. JMHO.

I don't know all the sub-genres like House or Dubstep or Trance or whatever, it's all just techno or rap to me, but, some of that stuff doesn't really have much in it for deep LF, then some others is pretty much electronically generated 30 cycle triangle or sawtooth waves.

I did google "dubstep" once....could've sworn my computer was broken.

 

[Mr. Foxen]

Not actually sure you can tell the difference between 40hz and 25hz pure tones. You can pick up by the harmonics, because 25hz is heading to a rhythm territory, but you don't need to be able to reproduce 25hz for that, just the harmonic content.

 

[will33]

Not without first handing you a briefcase with double the amout of cash it would take to replace your entire PA. And you alone make the call of whether they get it back. That's the only way you know they'll take care of your gear.

Didn't you hear?....they blew it all on X.

 

[therhodeo]

While it may fill a niche for sub 40Hz, for a performing band playing to the larger group with disposable income that grows tired of the ear fatigue. I don't see the relevance personally. JMHO.

Old people?

 

[Cirk]

Thus they would not have it in the first place. That's all I'm saying. Not your fault they were being stupid and disrespectful.

 

[R Baer]

Yup, I know I'm probably get beaten over the head for this, but please indulge my curiousity. I'm looking to build a cab (or biamped cab set) that will respond down to a fundamental drop A (about 25hz IIRC) without drop off...

Regardless of the type of music, there's zero point to trying to reproduce frequencies this low for bass guitar in a band. All you will end up is a tone that is a nightmare for every room you play in. You won't be making many friends of the sound person at your gigs, that's for sure. True you need a very robust driver to handle the drop A tuning, but don't get hung up on actually trying to reproduce the fundamental frequency. Look into designs using an Eminence 3015LF driver for this kind of muscle. Another great driver for this is the Faital 15FH520. I built a prototype cab using this driver and it will handle just about anything you can throw at it. Give Don at LDS a call. I'm sure he could make you a 215 cab that would do the job just fine.

 

[will33]

Just to get back on topic a little bit, not too much now, that'd ruin the fun, but just a little.....OP, what is the intended use here? Live FOH sound? Gigging bass rig? Recording/listening? General output/volume requirements or room size/outdoor audience coverage, etc.


BTW, "because I can" is also a great answer.

 

[will33]

Old people?

Disposable income?....ear fatigue?.....yup...old people.

 

[B-string]

Old people?

Yep 30's to 60's from what I have personally seen

 

[Cirk]

Will33 nailed it. Insert dirty joke about dogs here. It's hypothetical at this point, just looking for feasability and practicality.

 

[Downunderwonder]

Neither.

Number of threads on 25hz bass rigs in last 24 months: five.
Number of 25hz rigs built: zero.

 

[will33]

Will33 nailed it. Insert dirty joke about dogs here. It's hypothetical at this point, just looking for feasability and practicality.

Nailed what??

Feasable, yes. Practical....not so much.

Depending on output requirements, something like the unit in B-strings link (super high excursion, digitally controlled piston, although they will present some harmonic distortion at those leves), or a herd of horns could do it.

 

[Wagz]

I have a mid-60s Jensen 12" with a claimed Fs of 15Hz I'll sell ya (there might be a reason it's only rated for 40W)

In all seriousness, a 20Hz sound wave is over fifty feet long. Even if you could produce it with flat response using something "portable", you'll be somewhat restricted in terms of appropriate venues where it won't sound like poop - I'd guess your choices will include "outside" or "sports arena".