Light-weight 15" Cab Design

[will33]

If you're all that engineery, it shouldn't be too difficult to get a very close approximation of the internal volume by reverse engineering it from the external dimensions alone.

Not that it'd matter, as the Bassic is a completely different design than what you're trying to do.

 

[George Mann]

Well, I have decided to put this concept on hold until I can get a cab built. Thanks for the camaraderie.

 

[psycom]

try getting in touch with Jason Tice for a 15 speaker. He has some listed on eBay. search PMR Speakers and/or HEMPOPOTAMUS™ think he's goes under STPMF or close to it.

I have a bunch of his speakers and they whip but. guys a guru at design and could also help you out with porting etc..

I have a 15 Peavey NEO he redid and it held up the bi-amped low end of a crown XLS 1200. I designed a system for a slap happy thumper and really had my doubts of it holding up. originally rated at what 150 watts 135?? was hitting it closer to 500 and it lived AND sounded GOOD!

That same speaker is in Nashville and replaced an EV15B and Howard Yearwood said "it sounds better than the EV15B and is a 1/4 of the weight" and he knows speakers.

I found Jason 5 years ago when looking for an 8" driver for RISSON AMPS. Developed a friendship with him and now working for him setting up distribution and marketing. The EDEN Bass forum has postings about him.

I do believe there are a couple 15s he's revamped and selling off cheap as he rolls out his own line. That's your best bet for a deal on a great speaker. this from experience not as a sales pitch.

if you need anything else you can email me at ReAmpHeaven at Gmail. I have some bass 10's and a scorpion 15 I'm getting rid of. just needed the cabs for R&D work.

stuffs in knoxville tn so shipping cabs is out of question but Indo have 15 and 210 empty boxes I want rid of too. kept hardware but boxes intact.

rich

 

[yodedude2]

if it was me and i wanted a cab on the cheap (i.e., 'reasonable') for a prototype, i would buy a used beat-to-heck large cab and put false walls inside it to get the interior volume down to the correct size. i saw a hartke 15" cab two days ago at krazy kat's in san antonio for $30.

once the prototype was perfected, then i would look for a professional cab builder.

 

[iualum]

I am a designer and engineer, not a cabinet builder!

Well if you want what you want & you can't find someone else to build it, then become a designer, engineer, and box builder.

 

[Jeff Scott]

His profile has him as an inventor; surely, inventors build the stuff they are inventing, right?

"Occupation:
Inventor. Engineer."

 

[George Mann]

His profile has him as an inventor; surely, inventors build the stuff they are inventing, right?

"Occupation:
Inventor. Engineer."

Yes. But I currently do not have the ability to build a cab!

 

[George Mann]

if it was me and i wanted a cab on the cheap (i.e., 'reasonable') for a prototype, i would buy a used beat-to-heck large cab and put false walls inside it to get the interior volume down to the correct size.

I have done so, and will likely do so again.

 

[Jeff Scott]

Yes. But I currently do not have the ability to build a cab!

Understood.

 

[BioWeapon]

If I was close to you I'd gladly build you a cab, but I'm not :/

 

[George Mann]

Update. I have settled on a 7.5" round vent utilizing compressed damping material. It will be installed on the rear baffle directly behind the driver.

 

[DukeLeJeune]

Update. I have settled on a 7.5" round vent utilizing compressed damping material. It will be installed on the rear baffle directly behind the driver.

I presume this is a return to the original "aperiodic" (perhaps more precisely "pressure relief", as "aperiodic" implies a Qts below .50) configuration? Kudos for boldly going where (to the best of my knowledge) no bass cab builder has gone before!

Don Oatman at Low Down Sound might be a possible cab builder for you. I don't know whether he works with lightweight poplar plywood or not.

Back in the late 80's I did a pressure-relief box to tame the boominess in what would otherwise have been a high Qts sealed box. The project ended up in a SpeakerBuilder Magazine article. I used a slot vent and trial-and-errored various types and thicknesses of damping material and settled on an open-cell foam.

Would you have any interest in the Variovent? I have six that I'll probably never use. Yours for the price of postage.

Have you found a way to model the excursion for your design? Excursion would be my main concern. On the Alpha 15, the suspension system is what sets xlim, so the voice coil won't hit the backplate, but the suspension system will take a lot of stress if you drive it to xlim and will fail over time.

 

[George Mann]

I presume this is a return to the original "aperiodic" (perhaps more precisely "pressure relief", as "aperiodic" implies a Qts below .50) configuration?

Yes, you are correct.

Kudos for boldly going where (to the best of my knowledge) no bass cab builder has gone before!

Thank you.

Would you have any interest in the Variovent? I have six that I'll probably never use. Yours for the price of postage.

Are these the ones made by Seas and ScanSpeak?

Have you found a way to model the excursion for your design?

Not to any degree of certainty.

Excursion would be my main concern. On the Alpha 15, the suspension system is what sets xlim, so the voice coil won't hit the backplate, but the suspension system will take a lot of stress if you drive it to xlim and will fail over time.

I hear you, but fortunately, I have rarely stressed a driver to its xlim in actual use!

 

[DukeLeJeune]

The variovents I have are labeled "Scan-Speak". I got them from Madisound several years ago for a home audio project that changed directions before they ever got used.