Bass Cleff - Isobar 410

[Numa]

I created my little jewel.
I show you the work done.

The concept

The Isobaric Chamber

Birch 24 mm

135° Deg.

Wave Convergence

The Isobaric Heart

Core of Cohesion

Epoxy Strenght

Thanking the Weight

All lined up

Waiting for the Glue

The Attention to Detail

Takes Shape

The Tweeter Hole

The Tweeter black Hole

It's Time to connect

Temporary assembly

Epoxy Prime

Satin black Finish

Inputs

Finally Home

And now it's playng!

 

[6thplanet]

Excellent build! What woofers are they?

 

[Numa]

The speakers, tweeter and crossover are from an old Ampeg 410 PRO which I found in excellent condition.
Right now I don't have the exact part number but they are Eminence / 4 x 150W RMS / 8 Ohms

 

[6thplanet]

Right on! I bet it's a heavy little bugger! What's the port tuned to?

 

[agedhorse]

How is this isobaric?

Is this a commercial product?

 

[Numa]

What's the port tuned to?

It should be around 60/65 Hertz

 

[Numa]

Is this a commercial product?

Absolutely not, it's just my personal experiment...

 

[Redbrangus]

Seems like a really, really nice build of a really questionable concept. That is, if it truly is isobaric; the pictures don't show it, but I had been presuming there were two more drivers behind the ones we can see to form the isobaric portion. Is this the case? Have you been able to perform any sort of amplitude response testing?

Edited to soften harsh language.

 

[Numa]

Seems like a really, really nice build of a really, really questionable concept. That is, if it truly is isobaric; the pictures don't show it, but I had been presuming there were two more drivers behind the ones we can see to form the isobaric portion. Is this the case? Have you been able to perform any sort of amplitude response testing?

You're right, you can't see it from the pictures, I'll have to open it, I'm missing a picture...
In the image "The Isobaric Heart" you can see the support where the internal speakers are fixed,

Anyway yes, of course, they are 2 10" speakers placed in front of two other identical ones.



I haven't done any tests with the analyzer yet, at the moment I'm content to hear the thunder coming out of that little thing.

However, the sound is decidedly deep and extremely defined.
The notes are perceived clearly.
Not having any intention of producing others commercially, I'm in no rush to test, I really like the way it sounds and I enjoy it that way.

It has one flaw however, it weighs over 100 pounds...

 

[JRA]

...the sound is decidedly deep and extremely defined. The notes are perceived clearly.

 

[twinfallsbass]

AWESOME build! I love my Orange Isobaric 2x12 cabs

 

[Numa]

I love my Orange Isobaric 2x12 cabs

Exactly, in fact my project is inspired by the Orange SP410

 

[Redbrangus]

It has one flaw however, it weighs over 100 pounds...

At least it's shorter than a 410.

 

[Wasnex]

Tried to find a internal view of an Orange Isobaric. Best I can find:

Appears to be a much simpler build.

I am curious if the more sophisticated build provides any advantages.

 

[Element Zero]

Forgive my ignorance, but what’s the point of an isobaric cab? I know they were popular about 20-30 years ago in the car audio world, but never understood the purpose.

 

[Wasnex]

Forgive my ignorance, but what’s the point of an isobaric cab? I know they were popular about 20-30 years ago in the car audio world, but never understood the purpose.

AFAIK the main advantage is you could stuff the same drivers in almost half the cubic volume and get the some LF response. Some claimed the sound is more clear as well.

Probably doesn't make sense anymore as you can buy modern drivers that work fine in small boxes.

A claimed benefit was an isobaric can handle twice the power, but IMHO this is actually a liability. With a regular 210 the combined sensitivity of both drivers goes up +3dB over a 110. With an isobaric, you don't get the the +3dB of sensitivity, rather sensitivity goes down -3dB. So, essentially a 110 will play at the same max volume as a 210 isobaric with 1/2 of the power.

 

[mikewalker]

The "barrel-staves" are a nice touch. When I was living in Russia (more than a dozen years ago, before the insanity) I had a friend there who was building custom drum shells like that.

 

[Peavaria]

If it sounds as good as it looks that will be mighty impressive! Nice work!

 

[ardgedee]

Probably doesn't make sense anymore as you can buy modern drivers that work fine in small boxes.

They make a little more sense in home hi-fi since they (typically) aren't intended to be moved around once they're installed, so size is more of a liability than mass. The Linn Isobariks were interesting in part because they didn't have to be placed in the middle of the room the way hi-fi speakers usually had to be, so you not only got a relatively compact speaker with the bass extension of something larger, you also freed up the floor space that a typical hi-fi speaker would be occupying.

 

[P. Aaron]

Kinda like an inverted (DCM) Time Window.