Quartz Restoration

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cushtech

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Quartz Restoration
« on: 20 Jan 2018, 03:17 am »

I am starting the restoration of a pair of ACI Quartz 3-way speakers and hope to perform a few upgrades while I do.  New wiring, new foam and new crossover components.   If anyone out there has information on the crossover, the manual or the kit instructions please let me know.

I've removed the deteriorated foam and the crossover.  Here's the schematic of the crossover (I'm not 100%  sure that it's the original design) and a copy of the page from the ACI catalog. The woofer is a Dynaudio 17W75, the midrange a D54af and the tweeter is a D28.








cushtech

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Re: Quartz Restoration
« Reply #1 on: 1 May 2018, 03:58 am »
Finally finished restoring the Quartz speakers and figured I'd post some pics as there's little information on the web about them.
I updated the crossovers with larger coils and caps so I decided to mount them on the back of the speakers.
The Quartzs are now living in my classroom which I can safely say has the best sound at the school.


Original crossover and variovent.


Defoamed and emptied enclosure.
 

New crossover mounted on the back of the cabinet.


Restored Quartz

borus

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Re: Quartz Restoration
« Reply #2 on: 31 Jul 2018, 12:12 am »
cushtech Just wanted to say Thank I have been trying to find info on this system for over 20 years. Your post is the most info I have found. I must say that it has made me yearn for more info. You show a drawing of the crossover but you say your not sure it is the right one. Then you show your new crossover did you confirm it was right or did you build from upgrade info? really any info would be great. Thanks again RCT

cushtech

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Re: Quartz Restoration
« Reply #3 on: 17 Oct 2018, 02:09 am »
I did not find any more information on the Quartz speakers.  The crossover was the same as another pair of Dynaudio 3 ways a friend of a friend had designed back in the 90s and the Quartz's came from him.  Whether the design was originally from Audio Concepts or his I am not sure.  I decided to build the new crossovers using the values from the old one in the speakers.  With the external crossover I can easily tweak things.  They are in my classroom where I teach and I'll actually run some frequency response curves on them later this year. 

borus

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Re: Quartz Restoration
« Reply #4 on: 1 Nov 2018, 12:20 pm »
Thanks again will be looking forward to your measurements. What do you teach?