LaScala Industrial Splits Questions

[geoff.]

I picked up a pair LaScala Industrial Splits last week. I have not listened to them yet. They will likely replace my ‘92 LS in the living room... or I will be in the doghouse!

 

Several questions are milling about, but the one that has me baffled the most is the 8 ohm rating on the bass bin, pictured below.

 

I pulled the panels off the bottom of both bins prior to purchase to confirm the K-43 was inside and checked them with an ohmmeter.

 

I did not see any other crossover components in the doghouse. Are they hidden somewhere else in the bass bin? I know the crossover is contained in the tops so I am stumped.

 

What makes the bass bin 8 ohms when a K-43 is a 4 ohm driver?

 

 

[JohnA]

Horn loading.  By capturing a column of air and holding it against the woofer cone, the horn creates more resistance to moving the air compared to a direct radiating woofer.  This raises the impedance.  The increase is actually about double, but 6.5-ish ohms qualifies as 8 ohms nominal. 

 

The captured column of air is one way to understand the cause of increased efficiency from horns. 

[geoff.]

Thanks John. 

 

That explains it.

 

I got 3.4 -3.6 on the ohmmeter, depending on how still I could hold my hands.

[Frzninvt]

The crossover network is housed in the MF/HF section, you feed a wire from the MF/HF to the LF section.

[HDBRbuilder]

Woofer works as a compression driver, because it is firing through a compression slot on its motorboard, which feeds into a horn lens throat.  4 ohms becomes NOMINALLY 8 ohms.  The key word is NOMINALLY.

[WMcD]

You can find technical information:

 

https://community.klipsch.com/index.php?/topic/28996-technical-information-on-industrial-lascala/&tab=comments#comment-243753

 

I'm quite sure the information is the same for the split version.

 

Also please note the AES reprint at the bottom.

ee

WMcD