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Showing results for tags 'AA Crossover'.
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LaScala LaScala Update Upgrade
Bubo posted a topic in Technical/RestorationsI copied my round up post over from this thread, please list any other LaScala mods, threads and parts sources. https://community.klipsch.com/index.php?/topic/149442-lascala-sonic-detail-improvement-for-only-22098/page-7#entry1926774 My LaScalas are circa 1980 Stock AA crossovers If I want to make improvements or changes in incremental steps, this is what I understand: Based on the above posts, and a conversation (2-3 years ago) with B Crites and the Klipsch factory support guy, the drivers in the LaScala don't wear out under normal circumstances. The capacitors, on the other hand do have an end of life, the transformer and inductor rarely fail (it would probably require an amp incinerating failure to fry the inductor or transformer). First: Update the 3 caps on the AA crossover, from the schematic in the pinned section. Stock: Sonicaps from Crites or others inc Parts Express brand. To me, stock always sounded very good 2x 2uF capacitors 1x 13uF Alternative Crossover update to lower the volume mids by 3db aka 50% decrease in power to Squawker. This is done to flatten the output across the bass and mids? I currently use an EQ to add output at the 400Hz point and rolling off into the up and down freqs from this point. 2x 2uF caps 1x 6.8 uF cap Both of these updates-mods are stand-alone and can be listened to and evaluated without further mods or repairs. Second This step could be either replace the K-77 (matched ?) phenolic tweeters with the Crites CT-125 EV driver with custom Crites Lens and titanium diaphragm. OR Replace the woofer with the Crites stamped Woofer $$, or Eminence Kappa 15C $, also mentioned above is the K-44 Factory $$$ woofer. http://www.parts-exp...-4-ohm--290-459 Both the tweeter and the woofer "upgrades" are standalone changes and require no mods to the crossover or anything else. Third If the K-77 is replaced with the Crites CT 125, as an option after moving to the CT-125.....the crossover point between the Squawker and the CT-125 can be lowered to take advantage of the increased range of the CT-125. Thread on CT-125 topic, one of many? https://community.kl...rs-in-la-scala/ Thread on Crossovers https://community.kl...pgrade-options/ Volti take on LaScala http://www.klipschup...upgrades2.shtml More horns + ALK http://www.alkeng.com/trachorn.html Alethia's take on custom crossovers http://www.aletheiaa...m/Services.html Crossover Options with CT-125: Do nothing leave at 400 and 6,000Hz, replace crossover 400 and 4,500 Hz, somehow modify existing crossover to 400 and 4,500. Forgot to mention the ALK Universal, I'm sure there are others.... The existing crossover may be modified, I don't know how. OR The AA crossover can be replaced with a new A 4500 from Crites http://www.critesspe...00-crossov.html "Problem with this is that the K-55 mid-range driver is pressed really hard to reach 6000hz. It would be much more linear in it's operation if the highest frequencies it has to reproduce were in the 4500hz area." Note: I'm guessing that PK the Designer was aware of this, and perhaps no better option was available than the EV K-77 tweeter, AND OR the mid-range K-55 is so sweet with the voice that it is better to leave as much of the voice as possible on the K-55 up to 400- 6KHz. Maybe if we had the engineer's notes we could know how the decision was made, I'm sure lots of trial and "does this sound better than"........ My opinion the LaScala: PK was a very good audio engineer, everything was done for a reason. Speakers that sound good, sell better. Was the mid range 400-6,000 intentionally boosted to put the human (Female) voice more forward aka Hear the Angels Singing? The K-55 really makes the angels sing. The low end could be better, a design trade off
aa crites re-built crossover Insomnia...
Sancho Panza posted a topic in Lounge
AA Crossover with new Crites supplied Sonicaps
Bubo posted a gallery image in Members Albums Category