Different pyramidal blocks inside the mouth of the Klipschorn's bass chamber

[lorcoll]

Hi.

I have a pair of 1984 Khorn and today I have bought a 1973 pair.

The two pairs differ in the motorboard rail that 1984 don't have and for the size of the pyramidal blocks (inserts) inside the 3"x13" hole on the fix motorboard.

I know that the best results is with the woofer  screwed directly onto the motor board, but what the differences (if any) with the two type of blocks (it is smaller in the 1984 Khorns).

I have attached pics of the two types. 

[lorcoll]

Why Klipsch has reduced the size of these blocks in the end of the 70's?

Even the AK5 type has the reduced blocks.

[stereohermit01]

La Scala , too. The older lascalas have the big splitter. Reduced in size in the later models. May have something to do with the TS parameters of the later k 33 changing.

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[stereohermit01]

Now begs the question , which has the better bass?. The better lower mid-range blend to the mid-range horn?

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[lorcoll]

The 1984 pair has the best bass but I have still to  screw the woofers directly onto the motor board to see the first difference.

For an objective comparation I have to mount the 1984 crossover too.

I hope someone have already done the comparison to tell us his impressions.

 

[Speakerfritz]

the square area from the tip of the prymid to the edge of the baffle slot is greater with the smaller "pyramid" .

 

in an even prior version, the cut out was double in size.   decreasing the size move the low end response curve so that one of the spl peaks was more in the middle of the 40 to 400hz range.  the pyramid size change could be a further tweak of that.