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Multi-Way Conventional loudspeakers with crossovers

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Old 3rd November 2006, 01:15 AM   #1091
FrankRoss is offline FrankRoss
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Join Date: Nov 2001
Location: Pennsylvania
Default Bozak Concert Grands Completed!

First, I'd like to thank everyone on this board, not only for offering invaluable expertise, but also for giving me moral support after botching up a veneer job!

I followed Rudy Bozaks plans pretty much verbatum, but because I was not able to obtain some of the original parts I was forced to make some slight modifications - none of which affect sound. Cabinet size was kept faithful to the original specs.

The speakers consist of 4 -12" woofers (8-ohm), 2 - 6" midranges (16-ohm) and 8 - 3" tweeters (8-ohm). The N-101A 8-ohm networks are passive, crossing over at 800 and 2500 Hz 6db/octave.

Not able to obtain a second tweeter array bracket, I split the one that I had, using each half of the bracket for the bottom of the array and used metal tabs for the upper.

I was not able to find midrange mounting rings, so fashioned my own using a router and the trusty 'ol Jasper.

The woofer rings originally had provision for mounting a tweeter pair (intended for the smaller Concerto series), so using a hack saw I cut the center brackets out, then belt sanded the outer rings to fit inside the cabinet.

The heavy duty speaker terminals from Parts Express are worth every penny and then some, but because those things pertrude so far out of the back of the cabinet, I routed out a circle... you can see the attached pic to see what I've done...

In the next couple of weeks I think that I'm going to go with the Danish Oil, but after the botched veneer episode I need a break for a while. The living room obviously needs to be re-arranged, but having a wife to deal with makes the task more of a challenge. Part of the sectional needs to go - as well as finding a suitable place for the subwoofer (part of a different system).

The Dynaco Stereo 70 amp and Dynaco PAS 2 pre-amp have been upgraded using Van Alstine mod kits, the pre-amp also is utilizing hybrid buffers in the line stage.

The new EH 6CA7 tubes have not been broken in (or even biased yet), but these Grands already sound so magnificant!

Finally to top it all off (while listening to Bartok) my little girl lost her second tooth! After all the money that went into this project... does the Tooth Fairy really exist?
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Old 3rd November 2006, 01:17 AM   #1092
FrankRoss is offline FrankRoss
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Old 3rd November 2006, 01:22 AM   #1093
FrankRoss is offline FrankRoss
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Old 3rd November 2006, 01:23 AM   #1094
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Old 3rd November 2006, 01:25 AM   #1095
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Old 3rd November 2006, 01:26 AM   #1096
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Old 3rd November 2006, 01:28 AM   #1097
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Old 3rd November 2006, 01:29 AM   #1098
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Old 3rd November 2006, 01:30 AM   #1099
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Old 3rd November 2006, 01:31 AM   #1100
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