DIY Altec 604E’s - A soon to be proud duplex owner.

Do It Yourself
Looking good Jose! See, I told you that would buff out. ;)

Now... let’s build you some networks!
 
at the risk of being profoundly heretical :)
Had I a pair of Duplexes, and had I not access to either the stock Altec XO or the Mastering Labs XO for them, I would fashion a simple first order (!?!!?!) XO for them at, say, 1200 Hz using a good quality capacitor and a good quality inductor (and maybe a variable L-pad on the treble driver). I would also stick with fleapower (just to be on the safe side).

Ideal? Far, far from it!
Palatable in the interim? Very possibly.

No, I haven't tried it -- although I am running first order XOs on my current Frankenaltec configuration. Just sayin', you know? :)
DSC_9704 (4).JPG



(and, yes, of course those are audiophile clipleads)
 
I used the XO's that came with the drivers. I thought about buying a pair of 604E's before the GPA's. I searched the XO's for the 604E. The Markwart comes to mind. I remember something about the inductors or something was variable in the schematic. Here is the Mastering lab schematic. It's for 16ohm drivers.
M_L_604_Xover.PNG

More info on this crossover that I came accross WRT it's application in the Big Red Monitors:

http://www.audioheritage.org/vbulle...g-Red-Monitors&p=293532&viewfull=1#post293532
 
Yes that's the one where you would have to modify the inductor. The post states about unwinding the 1.5mh inductor until you reach the inductance of .015mh then tap a feed. Rewind the rest and finish the circuit. Not sure it will work but, It might.
If it does I would think you have a winner.
 
And the plot thickens!

Just yesterday I placed orders for all the parts to build Jose’s crossovers. Which, are going to be Jeff Markwart N1500A with MF EQ.

Jeff was kind enough to share the schematic with me for this build, but as he never publicly released the design he has asked that I not share it, so I will respect his wishes and that element will remain a mystery. ;)

On to the crossover. Parts that will be used are Mundorf EVO Aluminum Oil capacitors, Mundorf MCoil Foil inductors, Mills resistors and all tied together with Dueland Tin/Copper wire.

It ought to be a good’un!
 
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