Allison ic10 vs Allison One internal volume

[petteyr]

I was comparing published speaker volumes for the Allison IC10 and the Ones.

The IC10 published volume is 3800 cu inches, while the Ones say 2550 cu inches.

Here is the issue,  both speakers have the same published external dimensions : 40x19x10.75 inches.

Essentially,  the same boxes. The primary difference being the woofers. 

The IC10 have 8 inch (push pull) and the Ones are 10 inch.

So, what gives with the published internal volumes?

Are there some baffles or bulkheads in the Ones that reduces volume?

 

[newandold]

10 hours ago, petteyr said:

I was comparing published speaker volumes for the Allison IC10 and the Ones.

The IC10 published volume is 3800 cu inches, while the Ones say 2550 cu inches.

Here is the issue,  both speakers have the same published external dimensions : 40x19x10.75 inches.

Essentially,  the same boxes. The primary difference being the woofers. 

The IC10 have 8 inch (push pull) and the Ones are 10 inch.

So, what gives with the published internal volumes?

Are there some baffles or bulkheads in the Ones that reduces volume?

 

The IC10 Cab. Is an entirely different animal as opposed to the A1.

Don’t know if the internal measurements were published with or without the cabs. Populated, but certainly, both A1 drivers forward facing take up much more internal cabinet volume than the 8 inchers with one being inverted on the 10.

Front panels on the IC are not flush, but more flush than the One, adding yet more internal volume. 

Note that the center wood strip in the front of the IC prism is nearly twice as wide as on the A1, that yields more cab. volume within the same dimensions.

 

Bill

[petteyr]

Thanks for the observations.

What I would like to see are the metrics for the inside of the ic10 box.

I realize these are rare.

I am just curious about the ic10s compared to the Ones.

Allison states that the exterior of the ic10 is the same as the One.

The tweeters and midst are basically the same as well. 

The ic10s front panels does seem to extend a bit more than the Ones..

The ic10s are about 1250 cu inches bigger than the Ones. That is nearly the volume of a A4 (1265 cu in).

Allison measured internal volume without factoring in displacement of drives...just gross volume. 

I verified this on my A3, C8s.

[newandold]

On 7/18/2019 at 10:19 PM, petteyr said:

Thanks for the observations.

What I would like to see are the metrics for the inside of the ic10 box.

I realize these are rare.

I am just curious about the ic10s compared to the Ones.

Allison states that the exterior of the ic10 is the same as the One.

The tweeters and midst are basically the same as well. 

The ic10s front panels does seem to extend a bit more than the Ones..

The ic10s are about 1250 cu inches bigger than the Ones. That is nearly the volume of a A4 (1265 cu in).

Allison measured internal volume without factoring in displacement of drives...just gross volume. 

I verified this on my A3, C8s.

 

[newandold]

Even more interesting to me would be how many IC 10’s we’re actually built back in the day.

The cabinets were outsourced just as the 20’s were, and the 20’s were 100 cabinets in total. 
 

The IC 10 probably wins the prize for the most unknown and least produced loudspeaker ever to come out of the company.

As seen here in the thread, there was a printed spec. sheet on the loudspeaker, available from the factory, but never the typical sales brochure that could be had of any other model.

Bill