This is one I came up with, I never got around to trying jeffs.
https://www.flickr.com/photos/82812412@N03/8687535405/
About time I build some new crossovers from my 604C's that have been reconed by GPA. They are 16 ohm. Which of the Markwart crossovers would be the best fit? The 604B Phase Correct Crossover with MF EQ or the 604-16X Phase Correct Crossover. This is all new and I'm slightly confused.
Thanks for any help to clear up my confusion.
Gary
This is one I came up with, I never got around to trying jeffs.
https://www.flickr.com/photos/82812412@N03/8687535405/
I have GPA 604-8III's in MLTL cabinets. I built the Jeff Martwart Simplified 604E crossover several years ago. After a while and hearing other GPA / MLTL
setups I found my crossover to be not as satisfying.
My friend Dr. Lowmu advised me to try a simple "Serial Type" crossover like the Altec 604 N-1500A crossover.... Well I did
and I love it. It's much more sensitive and much more dynamic than the Markwart crossover.
"And the beat goes on"<br /> Willie
The more components you add the worst things sound. Everybody probably doesn't agree with that but then they probably haven't heard them all either. The mock N1600's I did sounded the best out of anything I came up with.
https://www.flickr.com/photos/82812412@N03/8351672131/
Last edited by cradeldorf; February 21st, 2014 at 02:57 AM.
Another vote for the N1600! I discovered this when I got a 605B for my mono system. I've since adapted it for my Altec 2-way.
The Altec 604E N-1500A crossover
I've got the schematic , I'll try to download too !
Willie
- - - Updated - - -
Ok here is the Altec N-1500A schematic..... Oh so simple... but sounds so good!
Willie
"And the beat goes on"<br /> Willie
Originally Posted by drummerwill
ALTEC Friends: There is a common denominator between the N-1600A and N-1500A crossovers, that makes them sound so good on 604s. It was subject of a prior post of mine here :
http://www.hostboard.com/forums/f700...ers-altec.html
BOTH those ALTEC crossovers are :
(a) Series-driven rather than the conventional Parallel-driven.
(b) First order ( 6 dB per octave) rather than 12 dB per octave.
Now, I just have to get Dominique Tanguy to go from Series-12 to Series-6 dB !!! He'll get there, the French are a little slow and a little behind us Americans ...you know !! :-) Dominique, LISTEN to 6 dB !!! SERIES of course.
Bon Soir,
Jeff Medwin
Last edited by LowOhms; February 21st, 2014 at 06:23 PM.
My N-1600B looks like it has a N-1600A inside with N-1500A type of circuit. The resistor is a 20 ohm and the pot is 25 ohm. The taps on the inductor (no idea of what value it is) aren't used as the output is soldered to the 0 db screw. At this point I don't want to take it completely apart but I'll but bet a 16mfd cap is substituted for the 14mfd that's used in the N-1500A. Altec probably had a lot of left over tapped inductors and reused them. Might even be a complete N-1600A unit with additional components to complete the N-1500A topography. Does anyone know for sure what the schematic and component values are?
I love simple, so thanks for the help gentlemen. I'll keep you posted on my results.
Don't be fooled by one-size-fits-all crossovers, particularly when it comes to the values of the components. Notice that I didn't say crossover designs.
The old serial crossover design does sound good, but I wouldn't trust the values on an old schematic. Nothing will beat actually measuring your particular speakers in your particular cabinets, in your particular room, and then using those measurements in a crossover design for that application. I have the 1500 sim laying around here somewhere if you need it.
- Mike
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