geoff. Posted March 31, 2018 Share Posted March 31, 2018 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? Quote Link to comment Share on other sites More sharing options...
JohnA Posted April 1, 2018 Share Posted April 1, 2018 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. Quote Link to comment Share on other sites More sharing options...
geoff. Posted April 2, 2018 Author Share Posted April 2, 2018 Thanks John. That explains it. I got 3.4 -3.6 on the ohmmeter, depending on how still I could hold my hands. Quote Link to comment Share on other sites More sharing options...
Frzninvt Posted April 3, 2018 Share Posted April 3, 2018 The crossover network is housed in the MF/HF section, you feed a wire from the MF/HF to the LF section. Quote Link to comment Share on other sites More sharing options...
HDBRbuilder Posted April 8, 2018 Share Posted April 8, 2018 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. Quote Link to comment Share on other sites More sharing options...
WMcD Posted April 8, 2018 Share Posted April 8, 2018 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 1 Quote Link to comment Share on other sites More sharing options...
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